optional parameter in MIDL with default value

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  - 1
    - Drive Letter Hi, Is there an API that takes a partition number and returns the drive letter of that partition? Thanks, -P Tag: optional parameter in MIDL with default value Tag: 231954
  - 2
    - error LNK2005 I am getting the LNK2005 for mulitple definitions of all my subroutines. Here's my structure: cc_main.cpp - contains the code fore main() cc_subs.cpp - contains the various routines called by main() cc_lib.h - the definitions for the subs. in cc_main I have the #include "cc_subs.cpp" directive in cc_subs I have the #include "cc_lib.h" directive at the top of both cc_subs.cpp and cc_lib.h I have the #ifndef statements that were supposed to avoid the multiple linking. How do I fix the multiple linking problem. Thanks, Tag: optional parameter in MIDL with default value Tag: 231949
  - 3
    - CString problem I am trying to make a wrapper class that contains the GetLogicalDriveStrings() function. Is there a way to 1) Get this buffer copyed into a CString 2) Use the CString in the same manner that the buffer is being used. The problem i am running into is the format of the buff string that is returned from GetLogicalDriveStrings(). It has the terminating character seperating the Drive Letters. A:/'\0'C:/'\0'... This seems to be doing something to the functionality of the CString. Here is the code. TCHAR * buff = NULL; buff = new TCHAR[nBuffSize]; GetLogicalDriveStrings(nBuffSize,buff); for(DWORD i = 0; i < nBuffSize; i += 4){ RecurseDirs(&buff[i]); } Any better suggestions on how to implement this would be great also if there is a better way. Tag: optional parameter in MIDL with default value Tag: 231947
  - 4
    - C++ dll from VB First off let me say that I am not a C++ expert and any help would be appreciated. Here is part of the function that I am trying to modify the strncpy function crashes when I try and call the function from VB when debugging However if I use the exe that I generate from VB in the C++ debuger it does not crash. Or if I execute the EXE everything seems to work fine I suspect that when I call the dll in the VB debuger the values are not passed the same as when I execute the compiled exe. How can I get filepath[] to display in the MessageBox? BOOL _stdcall GetPatName2(char filepath[], char* patname,int filepath_len){ BOOL return_val = SUCCESS; int sample_size; char *PName; long filesize; long wnum =0; char *file_name; struct SAMPLE_HEADER *raw_data_buffer = NULL; int file_no; PName =(char*)AllocateHeap(PNAMESIZE); file_name = (char *)AllocateHeap(filepath_len+1); MessageBox(NULL,(LPCTSTR)file_name2,TEXT("Sample Code"), NULL); strncpy(file_name,filepath,filepath_len); file_name[filepath_len] = '\0'; //make sure its null terminated MessageBox(NULL, TEXT("Job Done\n"), NULL, NULL); return (return_val); } VB fuction declaration Declare Function GetPatName2 Lib "c:\test\testdll\Debug\playback.dll" Alias "#4" (ByVal Filepath As String, ByVal PName As String, ByVal FILEPATHLEN As Integer) As Boolean Thanks Nevlis Tag: optional parameter in MIDL with default value Tag: 231944
  - 5
    - self modifying exe hi, can anyone help me writing self modifying exe??? any article, site, reference??????? i need to write one in C/C++ this has to be console based application. thanks. bye, Farooq Khan Tag: optional parameter in MIDL with default value Tag: 231939
  - 6
    - restricting number of digits after decimal point using CString.format() Hello, To dispaly the value of variable B of type double in a MFC text control, I am using the following three lines CString maxA; double B=0.00; maxA.Format("%f ",B); Everything is and the numbers are diplayed like '2.987654'. I would, however, want the numbers to be displayed upto only three digits after decimal point. Would someone tell me please how can it be done? Thanks. Tag: optional parameter in MIDL with default value Tag: 231933
  - 7
    - Remove a file over the network on a Sun Hi I have an application on a Windows PC who shoul delete files on a Sun which is in the same network. I try this with 'remove', e.g. remove(\\Sun\Temp\File.jpg). But this doesn't work. The return code from remove is not 0 and the errno is 22 (invalid argument). What could be wrong? I have access to the Sun and have tried this with the directory mounted or not mounted and I have tried the same (delete a file) on a Windows and a Mac OS X machine in the netwroks. This works fine. Thanks for any help. Regards Hans Tag: optional parameter in MIDL with default value Tag: 231930
  - 8
    - Function problem I'm kinda new to C++, having programmed VB6 and VB.NET for some time. Here's my function: extern "C" __declspec(dllexport) long* CHARtoINT(char* input); long* CHARtoINT(char* input) { int length = strlen(input); long* output; for (int i = 0; i < length; i++) { output[i] = (long)input[i]; } return output; } The purpose is to pass in a string, and return a long (would prefer int) array. I need every letter of the string that comes in to be it's own array member in the outgoing array in ASCII equivs. For example, if I pass into it "Hello", I need this returned: [72],[101],[108],[108],[111] Should be simple, but after 3 weeks, I still can't get it too work right. I've even tried to pass a areference to the long* as a parameter, and still no good. Ohh, BTW, this needs to be able to be called form VB, and C++, and .NET. Nice added touch, right? Thanks, Tibby Tag: optional parameter in MIDL with default value Tag: 231926
  - 9
    - solution to clearcase : VC++ error: fatal error C1033: cannot open program database I have been getting this error in clearcase trying to compile my VC++ projects fatal error C1033: cannot open program database Some people have posted this problem on the NG but nobody has posted a solution. So it was frustrating for me trying to fix the problem but now I have fixed the issue and I want to post in this NG so that someone else who comes across this erros does not have to waste much time. And here is the solution to the problem (pretty lame but i ended up wasting too much time). In the clearcase home base, go to "administration". In "administration" select "control panel" In "control panel" select "MVFS" In MVFS there is something called "case insensitive MVFS". In my machine it was unchecked. So it was generating those errors. To fix the problem we have to check "case insensitive MVFS" option and followed by checking the next option "Case preserving" (a new check box "case preserving" comes up when we check the "case insensitive MVFS" option). Tag: optional parameter in MIDL with default value Tag: 231925
  - 10
    - Library RSA SHA1 PKCS1v15 + X509 -> COM? Hi! Does anyone know a free library who manage theses sepecifications under windows? !!!No .NET - No Java - only COM (VB6 VC6)!!! I receive 3 binary files : The original one, the signature(RSA SHA1 content not included), and the certificate with the public key X509.(1024bits) I only have to validate the original file with the signature... I alread tryed theses libraries : WCCO - Too hard to work with ActiveCrypt - Doesn't manage X509 ASPEncrypt - doesn't manage certif >256Bits in the free version CryptLib - too hard and too expencive... OpenSSL -i didn't understand all... ebCrypt - OK but the verification work with a content included(and i don't know how to concat it) In M$ CryptoAPI - No PKCS1v1.5... Only PKCS7 CAPICOM - idem (Is it possible to concat the signature with the public key and the content to fit in the specs of capicom... To use the SignedData.verify - if yes : how?) PS: I'm newby in cryptology... Sincerely, Delfosse Jérôme Tag: optional parameter in MIDL with default value Tag: 231924
  - 11
    - Calling "system" without console window appearing When I call an external program from another program (either MFC standalone or as a plugin inside another application), then a call to system always launches a console window. Can I prevent that? --- stefkeB --- Tag: optional parameter in MIDL with default value Tag: 231920
  - 12
    - Microsoft Visual C++ .NET 2003 compiler problem #include <memory.h> class str{ public: str(){memset( &szBuf, 0x00, sizeof(szBuf) );} bool operator == ( str& strTmp ) { return memcmp( &this->szBuf, &strTmp.szBuf, sizeof(this->szBuf) ) == 0; } bool operator != ( str& strTmp ) { return memcmp( &this->szBuf, &strTmp.szBuf, sizeof(this->szBuf) ) != 0; } operator char* (){ return (char*) szBuf; } private: char szBuf[128]; }_str; int main(int argc, char* argv[]) { str s1; bool b = s1 == str(); return 0; } Hi there, In the source above when I use Microsoft Visual C++ .NET 2003 at line 'bool b = s1 == str();' first is called operator (char*) for member 's1' after that is called operator (char*) for str() and then operator == for type (char*). Of course after this the result from '==' is 'false'. If I add 'const' for referenced parameter in str::operator == ( bool operator == ( const str& strTmp ) ...) the right operator is called (str::operator == ) and the result is 'true'. In Microsoft Visual C++ .NET 2002 and in Microsoft Visual C++ 6.0 this source works fine (str::operator == is called) without adding 'const' to the parameter. Is this is cimpiler bug or something else? Any ideas, comments, thoughts... :-)) Thanks Dimitar Lazarov Tag: optional parameter in MIDL with default value Tag: 231919
  - 13
    - Create a dir where all the users have the right to write How can I programatically do the equivalent of the following: cacls "C:\Program Files\test" /T /G Everyone:f ? Thanks, Viv Tag: optional parameter in MIDL with default value Tag: 231918
  - 14
    - Cannot save file. The file may be in use by another application I am running MSVC 6.0 Ever since I upgraded to XP (and I don't think it is related to that) I've been getting a strange and inconsistant error. In some projects (not all, some more than others) occasionally when I save a file I get an error messagebox saying: "Microsoft Visual C++" "Cannot save file. The file may be in use by another application." I don't think it is in use by any other applications and when I repeat the save it always works fine the second time. I've tried to compare a problem project with one that rarely does this, but I don't see any setting differences. It's getting to be really annoying. Any help is really welcome. Thanks in advance, --Tom Swezey -- -- **** Signature **** (KISS: Keep It Simple, STUPID!) **** Check out my Web Site: http://www.winternet.com/~swezeyt (o o) E-mail me at swezeyt@winternet.com oOO*( )*OOo********************************************* Tag: optional parameter in MIDL with default value Tag: 231917
  - 15
    - FindNextChangeNotification I am trying to write a little program to monitor a directory and its sub-trees. I get FindNextChangeNotification, FindNextChangeNotification and FindCloseChangeNotification to work fine but when they pop I can't tell what file changed. I've looked at ReadDirectoryChangesW but I can't get it to compile - it says "undeclared identifier". Is there anyway to get this info? I'd hate to have to step through the directories one by one. Thanks in advance, -- Tom Swezey -- **** Signature **** (KISS: Keep It Simple, STUPID!) **** Check out my Web Site: http://www.winternet.com/~swezeyt (o o) E-mail me at swezeyt@winternet.com oOO*( )*OOo********************************************* Tag: optional parameter in MIDL with default value Tag: 231916
  - 16
    - MC.EXE: how to have single event log message file for several programs Hi all I have an application consisting of several programs. I want to have a single dll with event log messages for all programs together. Each program should have its own ProgXY-Msg.mc file. Is this possible? The following two lines make up the ProgXY-Msg.rc file: LANGUAGE 0x7,0x1 1 11 ProgXY-Msg.bin I suppose I can not have more than one resource with a leading "1 11". I suppose if I change it to "2 11" or "1 12" the event log will not be able to read its messages. Is there an alternative to concatenating all *.mc files into a single all.mc file before calling the message compiler MC.EXE? Is there anything like a commandline parameter to MC.EXE to read several mc-files at once? Is there anything like an include statement for *.mc files? Is there an alternative to MC.EXE with does anything of the above? any hints welcome Joerg M-T Tag: optional parameter in MIDL with default value Tag: 231915
  - 17
    - How can i use USB port in visual C++? I have to make a project . It will send sms. I have Motorla mobile phone. How can i communicate that mobile phone? Regards. Tag: optional parameter in MIDL with default value Tag: 231914
  - 18
    - (Not) Echoing Input in Secondary DOS Windows The following program compiles (in VC6.0) and executes, but it fails in one important area: echoing user input in secondary created DOS windows. If you examine the MkWin routine to see how I'm creating these windows (cobbled from MS Help code), something is not being done to make the fgets show data input after the base window's i/o. Specifically, you will see the the prompt for "First Name" works, but the processing for "Last Name" (in the 3rd window) doesn't echo the user input. However, the data is entered in the variable... Comments? Thoughts? TIA #include <stdlib.h> #include <stdio.h> #include <iostream> #include <ostream> #include <sstream> #include <string> #include <windows.h> #include <conio.h> #define strMax 1024 #define winMax 30 #define DYelBlk 0x0006 // Yellow-on-Black #define LCynBlk 0x000b // Light Cyan-on-Black #define LYelBlk 0x000e // Yellow-on-Black #define HiNorm 0x000f // Bright White-on-Black #define LBluWht 0x00f9 // Gray-on-Bright White // Type Declarations typedef char Str80[81]; struct S_W { // screen Window type short X1, Y1, X2, Y2; short WinType; short x, y; HANDLE oScreen, iScreen; DWORD fwMode; SMALL_RECT srctReadRect; SMALL_RECT srctWriteRect; } s_w[winMax]; // available windows // Global Variables HANDLE hCon = GetStdHandle(STD_OUTPUT_HANDLE); HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); CONSOLE_SCREEN_BUFFER_INFO csbi; WORD wOldColorAttrs; int Attr = HiNorm; DWORD cRead, cWritten, fdwMode, fdwOldMode; short c_w = 0; // current window short ParamCount = 0; // system parameter count, via argc Str80 ParamStr[10] = {""}; // File Name(s) storage using namespace std; void Pause(); // Pause execution; wait for user action void Fatal (char *s, int num); // Fatal Error processing void gotoXY(int X, int Y); char* RJust(char *s, unsigned int len); // Right-Justify char* Replicate(int n, char c); // replicate character void SystemInit(int ac, char *av[]) // System Initialization { ParamCount = ac; // set up "system globals" for (int i = 0; i < ac; i++) { strcpy(ParamStr[i], av[i]); } if (!GetConsoleScreenBufferInfo(hCon, &csbi)) { MessageBox(NULL, "GetConsoleScreenBufferInfo", "Console Error", MB_OK); exit (300); } wOldColorAttrs = csbi.wAttributes; for (i = 0; i < winMax; i++)// initialize system screen windows { // set defaults s_w[i].WinType = 0; s_w[i].X1 = 1; s_w[i].Y1 = 1; s_w[i].X2 = 80; s_w[i].Y2 = 25; s_w[i].x = s_w[i].y = 1; s_w[i].oScreen = s_w[i].iScreen = NULL; } // for s_w[0].oScreen = hCon; s_w[0].iScreen = hStdin; GetConsoleMode(s_w[0].iScreen, &s_w[0].fwMode); if (!GetConsoleMode(hStdin, &fdwOldMode)) { MessageBox(NULL, "GetConsoleMode", "Console Error", MB_OK); Pause(); } fdwMode = fdwOldMode; if (!SetConsoleMode(hStdin, fdwMode)) { MessageBox(NULL, "SetConsoleMode", "Console Error", MB_OK); Pause(); } return; } // SystemInit void FastWrite (short col, short row, const WORD attr, char *str) { BOOL fSuccess; COORD coord; DWORD cWritten; int len = strlen(str); WORD szAttr[4132]; coord.X = col-1; coord.Y = row-1; memset(szAttr, attr, len*2); fSuccess = WriteConsoleOutputAttribute(s_w[c_w].oScreen, szAttr, len, coord, &cWritten); fSuccess = WriteConsoleOutputCharacter(s_w[c_w].oScreen, str, len, coord, &cWritten); if (!fSuccess) { MessageBox(NULL, "FastWrite", "Console Error", MB_OK); exit (100); } } // FastWrite void clrscr() { DWORD dwWritten = 0; COORD coord = {0, 0}; GetConsoleScreenBufferInfo(s_w[c_w].oScreen, &csbi); FillConsoleOutputCharacter(s_w[c_w].oScreen, ' ', csbi.dwSize.X*csbi.dwSize.Y, coord, &dwWritten); FillConsoleOutputAttribute(s_w[c_w].oScreen, HiNorm, csbi.dwSize.X*csbi.dwSize.Y, coord, &dwWritten); SetConsoleCursorPosition(s_w[c_w].oScreen, coord); } // clrscr short ulc[2] = {218, 201}; // Upper Left char short hlc[2] = {196, 205}; // Horizontal Line Char short urc[2] = {191, 187}; // Upper Right Char short vlc[2] = {179, 186}; // Verticle Line Char short lmc[2] = {195, 204}; // Left Middle Char short rmc[2] = {180, 185}; // Right Middle Char short llc[2] = {192, 200}; // Lower Left Char short lrc[2] = {217, 188}; // Lower Right Char void BoxTop(short bt) { short bc = bt-1; char work[161], wline[161]; short nw = (s_w[c_w].X2)-(s_w[c_w].X1); sprintf(wline, "%s", Replicate(80, (char)hlc[bc])); wline[nw-1] = '\0'; sprintf(work,"%c%s%c",(char)ulc[bc],wline,(char)urc[bc]); FastWrite(s_w[c_w].X1, s_w[c_w].Y1, Attr, work); return; } // BoxTop void BoxBot(short bt) { short bc = bt-1; char wline[161], work[161]; short nw = (s_w[c_w].X2)-(s_w[c_w].X1); sprintf(wline, "%s", Replicate(80, (char)hlc[bc])); wline[nw-1] = '\0'; sprintf(work,"%c%s%c",(char)llc[bc],wline,(char)lrc[bc]); FastWrite(s_w[c_w].X1, s_w[c_w].Y2, Attr, work); return; } // BoxBot void BoxLine(short bt, short row, char *s) { char wline[161], work[161]; short bc = bt-1; short nw = (s_w[c_w].X2)-(s_w[c_w].X1); sprintf(wline, "%s%*s", s, nw, " "); wline[nw-1] = '\0'; sprintf(work, "%c%s%c", (char)vlc[bc], wline, (char)vlc[bc]); FastWrite(s_w[c_w].X1, row, Attr, work); return; } // BoxLine void MkWin(short x1, short y1, short x2, short y2) // Make Window { int fSuccess = 0; char emsg[strMax] = ""; COORD coordBufSize = {80,25}; COORD coordBufCoord = {0,0}; CHAR_INFO chiBuffer[81*51]; if(++c_w < winMax) // can we allocate this new window? { s_w[c_w].oScreen = CreateConsoleScreenBuffer( GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL); if (s_w[c_w].oScreen != INVALID_HANDLE_VALUE) { // Make the new screen buffer the active screen buffer if (!SetConsoleActiveScreenBuffer(s_w[c_w].oScreen)) { sprintf(emsg, "SetConsoleActiveScreenBuffer failure - Window #%d", c_w); MessageBox(NULL, emsg, "Console Error", MB_OK); exit (298); } s_w[c_w].X1 = x1; s_w[c_w].Y1 = y1; s_w[c_w].X2 = x2; s_w[c_w].Y2 = y2; // Set the source rectangle s_w[c_w].srctReadRect.Top = 0; // top left: row 0, col 0 s_w[c_w].srctReadRect.Left = 0; s_w[c_w].srctReadRect.Bottom = 24; // bottom right: row 24, col 79 s_w[c_w].srctReadRect.Right = 79; // Copy the block from the screen buffer to the temp. buffer fSuccess = ReadConsoleOutput( s_w[c_w-1].oScreen, // source screen buffer chiBuffer, // target buffer coordBufSize, // col-row size of chiBuffer coordBufCoord,// top left destination cell in chiBuffer &s_w[c_w].srctReadRect); // screen buffer source rectangle if (!fSuccess) { MessageBox(NULL, "ReadConsoleOutput", "Console Error", MB_OK); exit (97); } // Set the destination rectangle s_w[c_w].srctWriteRect.Top = 0; // top lt: row 0, col 0 s_w[c_w].srctWriteRect.Left = 0; s_w[c_w].srctWriteRect.Bottom = 24; // bot. rt: row 24, col 79 s_w[c_w].srctWriteRect.Right = 79; // Copy from the temporary buffer to the new screen buffer fSuccess = WriteConsoleOutput( s_w[c_w].oScreen, // destination screen buffer chiBuffer, // source buffer coordBufSize, // col-row size of chiBuffer coordBufCoord, // top left src cell in chiBuffer &s_w[c_w].srctWriteRect); // destination screen buffer rectangle if (!fSuccess) { MessageBox(NULL, "WriteConsoleOutput", "Console Error", MB_OK); exit (96); } } else { sprintf(emsg, "*** Cannot open window #%d - Terminating ***", c_w); Fatal(emsg, 299); } } else { c_w--; Fatal("*** Maximum Windows Exceeded - Terminating ***", 299); } return; } // MkWin void DrWin(short bt) // display empty window box { short rowsave = s_w[c_w].y; BoxTop(bt); // draw top of box for (int n = 1; n < (s_w[c_w].Y2-s_w[c_w].Y1); n++) BoxLine(bt, s_w[c_w].Y1+n, ""); // sides s_w[c_w].y = rowsave; BoxBot(bt); // bottom } // DrWin void gotoXY(int X, int Y) { GetConsoleScreenBufferInfo(s_w[c_w].oScreen, &csbi); COORD coord = {X-1, Y-1}; SetConsoleCursorPosition(s_w[c_w].oScreen, coord); } // gotoXY void Pause() // Pause program & wait for user response { char c1, c2; GetConsoleScreenBufferInfo(s_w[c_w].oScreen, &csbi); FastWrite(csbi.dwCursorPosition.X+1,csbi.dwCursorPosition.Y+ 1,Attr,"Press any key..."); c1 = getch(); if (c1 == '\0') // special/extended key; fetch scan code c2 = getch(); GetConsoleScreenBufferInfo(s_w[c_w].oScreen, &csbi); return; } // Pause void Pause(int x, int y) // Pause program, wait for user response { char c1, c2; FastWrite(x,y,Attr,"Press any key..."); c1 = getch(); if (c1 == '\0') // special/extended key; fetch scan code c2 = getch(); GetConsoleScreenBufferInfo(s_w[c_w].oScreen, &csbi); return; } // Pause char* RJust (char *s, unsigned int len) // Right-Justify { static char w[strMax]; memset(w,' ',len); w[len] = '\0'; // blank fill for left strcat(w, s); return w; } // RJust void Fatal (char *s, int num) // Fatal Error processing { printf (s); exit (num); } // Fatal char* Replicate(int n, char c) // replicate a character { static char w[strMax]; memset(w, c, n-1); w[n] = NULL; return w; } int main (int argc, char *argv[]) { char szName[25] = ""; SystemInit(argc, argv); // creates window #0 DrWin(2); // draw window - double bar FastWrite (2,7,LBluWht,"Enter your First name:"); gotoXY(25,7); fgets(szName, sizeof(szName), stdin); MkWin( 1, 1, 80, 25); // make window #1 Attr = LCynBlk; DrWin(1); // draw window #1 - single bar MkWin(11, 6, 70, 15); // make window #2 DrWin(2); // draw window #2 - double bar FastWrite (12,10,LYelBlk,"Enter your Last name:"); gotoXY(34,10); fgets(szName, sizeof(szName), stdin); Pause(2,24); return 0; } Tag: optional parameter in MIDL with default value Tag: 231913
  - 19
    - virtual-multiple inheritance. what an extra dword is for? This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C4577D.73E543F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello All, I've fount that if I compile the same program using gcc and vc 2003 = the same class E (see complete source bellow) has different size (on vc = it is 4 bytes bigger). Digging into this I've found that vc is reserving = a dword in the E class right before storage for virtual base class. In = my tests value of this dword always was 0. I did not see any code = referencing this memory.=20 Anybody has any idea what this dword is for? Vladimir. /* Compile: cl -EHsc -Zi t11.cpp Classes hierarchy A / \ | | | | B D C | | | | | | \ | / E Output: My Interpritation: ma=3Dff1, sizeof(A)=3D8 sizeof(vtable) + sizeof(ma_) mb=3Dff2, sizeof(B)=3D20 sizeof(vtable) + sizeof(mb_) + = 1*sizeof(DWORD) + sizeof(A) mc=3Dff3, sizeof(C)=3D20 sizeof(vtable) + sizeof(mb_) + = 1*sizeof(DWORD) + sizeof(A) md=3Dff4, sizeof(D)=3D8 sizeof(vtable) + sizeof(md_) me=3Dff5, sizeof(E)=3D40 =20 &before - &after =3D 13 Layout of the stack in the "main" function: Nr Address Value Points to My Interpritation 01 0012feb0 00000fe2 << veriable "after" 02 0012feb4 0041f178 t11!E::`vftable' << veriable e, start of E, = start of E::D 03 0012feb8 00000ff4 << e.md_ 04 0012febc 0041f188 t11!E::`vbtable' << start of E::B 05 0012fec0 00000ff2 << e.mb_ 06 0012fec4 0041f17c t11!E::`vbtable' << start of E::C 07 0012fec8 00000ff3 << e.mc_ 08 0012fecc 00000ff5 << e.me_ 09 0012fed0 00000000 << ???WHAT ARE THIS FOR??? 10 0012fed4 0041f174 t11!E::`vftable' << start of E::A 11 0012fed8 00000ff1 << e.ma_, end of E 12 0012fedc 0000000c << veriable "distance" 13 0012fee0 00000fe1 << veriable "before" */ #include<iostream> using namespace std; class A { public: explicit A(long ma) : ma_(ma) { } virtual void foo(); private: long ma_; }; void A::foo() { cout << hex << "ma=3D" << ma_ << ", sizeof(A)=3D" << dec << = sizeof(A) << "\n"; } class B : public virtual A { public: explicit B(long mb) : mb_(mb), A(0) { } virtual void foo(); private: long mb_; }; void B::foo() { cout << hex << "mb=3D" << mb_ << ", sizeof(B)=3D" << dec << = sizeof(B) << "\n"; } class C : public virtual A { public: explicit C(long mc) : mc_(mc), A(0) { } virtual void foo(); private: long mc_; }; void C::foo() { cout << hex << "mc=3D" << mc_ << ", sizeof(C)=3D" << dec << = sizeof(C) << "\n"; } class D { public: explicit D(long md) : md_(md) { } virtual void foo(); private: long md_; }; void D::foo() { cout << hex << "md=3D" << md_ << ", sizeof(D)=3D" << dec << = sizeof(D) << "\n"; } class E : public B, public C, public D { public: explicit E(long ma=3D0xFF1, long mb=3D0xFF2, long mc=3D0xFF3, long = md=3D0xFF4, long me=3D0xFF5) : A(ma), B(mb), C(mc), D(md), me_(me) { } virtual void foo(); private: long me_; }; void E::foo() { A::foo(); B::foo(); C::foo(); D::foo(); cout << hex << "me=3D" << me_ << ", sizeof(E)=3D" << dec << = sizeof(E) << "\n"; } int main(int, char **) { cout << hex; int distance =3D 0; int before =3D 0xFE1; E e; if(!distance) { //to prevent compiler from rearanging veriables on = the stack int after =3D 0xFE2; distance =3D &before - &after; } e.foo(); cout << dec << "&before - &after =3D " << abs(distance) << "\n"; return 0; } ------=_NextPart_000_002C_01C4577D.73E543F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=3DCourier size=3D2>Hello All,</FONT></DIV> <DIV><FONT face=3DCourier size=3D2></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    I've fount that if = I compile=20 the same program using gcc and vc 2003  the same class E = (see complete=20 source bellow) has different size (on vc it is 4 bytes bigger). Digging = into=20 this I've found that vc is reserving a dword in the E class right before = storage=20 for virtual base class. In my tests value of this dword always was 0. I = did not=20 see any code referencing this memory. </FONT></DIV> <DIV><FONT face=3DCourier size=3D2></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    Anybody has any = idea what this=20 dword is for?</FONT></DIV> <DIV><FONT face=3DCourier size=3D2></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>Vladimir.</FONT></DIV> <DIV><FONT face=3DCourier size=3D2></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>/*</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>Compile:<BR>    cl = -EHsc -Zi=20 t11.cpp</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>Classes=20 hierarchy<BR>       = A<BR>    =20 /   \<BR>    |    =20 |<BR>    |     = |<BR>   =20 B  D  C<BR>    |  | =20 |<BR>    |  |  |<BR>     \ = |=20 /<BR>       E</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier=20 size=3D2>Output:         &nb= sp;           =20 My Interpritation:</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    ma=3Dff1,=20 sizeof(A)=3D8      sizeof(vtable) +=20 sizeof(ma_)<BR>    mb=3Dff2, = sizeof(B)=3D20    =20 sizeof(vtable) + sizeof(mb_) + 1*sizeof(DWORD) + = sizeof(A)<BR>   =20 mc=3Dff3, sizeof(C)=3D20     sizeof(vtable) + = sizeof(mb_) +=20 1*sizeof(DWORD) + sizeof(A)<BR>    md=3Dff4,=20 sizeof(D)=3D8      sizeof(vtable) +=20 sizeof(md_)<BR>    me=3Dff5, = sizeof(E)=3D40    =20 <BR>    &before - &after =3D 13</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>Layout of the stack in the "main"=20 function:</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    Nr = Address  =20 Value    Points=20 to          My=20 Interpritation<BR>    01 0012feb0 =20 00000fe2          &nbsp= ;        =20 << veriable "after"</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    02 0012feb4  = 0041f178=20 t11!E::`vftable'   << veriable e, start of E, start of=20 E::D<BR>    03 0012feb8 =20 00000ff4          &nbsp= ;        =20 << e.md_<BR>    04 0012febc  0041f188=20 t11!E::`vbtable'   << start of = E::B<BR>    05=20 0012fec0 =20 00000ff2          &nbsp= ;        =20 << e.mb_<BR>    06 0012fec4  0041f17c=20 t11!E::`vbtable'   << start of = E::C<BR>    07=20 0012fec8 =20 00000ff3          &nbsp= ;        =20 << e.mc_<BR>    08 0012fecc =20 00000ff5          &nbsp= ;        =20 << e.me_<BR>    09 0012fed0 =20 00000000          &nbsp= ;        =20 << ???WHAT ARE THIS FOR???<BR>    10 0012fed4  = 0041f174 t11!E::`vftable'   << start of=20 E::A<BR>    11 0012fed8 =20 00000ff1          &nbsp= ;        =20 << e.ma_, end of E<BR>    12 0012fedc =20 0000000c          &nbsp= ;        =20 << veriable "distance"</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    13 0012fee0 =20 00000fe1          &nbsp= ;        =20 << veriable "before"</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>*/</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>#include<iostream></FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>using namespace std;<BR><BR>class A=20 {<BR>public:<BR>    explicit A(long=20 ma)<BR>        : ma_(ma)=20 {<BR>    }<BR>    virtual void=20 foo();<BR>private:<BR>    long ma_;<BR>};</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>void A::foo() {<BR>    = cout=20 << hex << "ma=3D" << ma_ << ", sizeof(A)=3D" = << dec=20 << sizeof(A) << "\n";<BR>}</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>class B : public virtual A=20 {<BR>public:<BR>    explicit B(long=20 mb)<BR>        : mb_(mb), A(0)=20 {<BR>    }<BR>    virtual void=20 foo();<BR>private:<BR>    long mb_;<BR>};</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>void B::foo() {<BR>    = cout=20 << hex << "mb=3D" << mb_ << ", sizeof(B)=3D" = << dec=20 << sizeof(B) << "\n";<BR>}</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>class C : public virtual A=20 {<BR>public:<BR>    explicit C(long=20 mc)<BR>        : mc_(mc), A(0)=20 {<BR>    }<BR>    virtual void=20 foo();<BR>private:<BR>    long mc_;<BR>};</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>void C::foo() {<BR>    = cout=20 << hex << "mc=3D" << mc_ << ", sizeof(C)=3D" = << dec=20 << sizeof(C) << "\n";<BR>}</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>class D = {<BR>public:<BR>   =20 explicit D(long md)<BR>        : = md_(md)=20 {<BR>    }<BR>    virtual void=20 foo();<BR>private:<BR>    long md_;<BR>};</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>void D::foo() {<BR>    = cout=20 << hex << "md=3D" << md_ << ", sizeof(D)=3D" = << dec=20 << sizeof(D) << "\n";<BR>}</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>class E : public B, public C, public = D=20 {<BR>public:<BR>    explicit E(long ma=3D0xFF1, long = mb=3D0xFF2, long=20 mc=3D0xFF3, long md=3D0xFF4, long=20 me=3D0xFF5)<BR>        : A(ma), = B(mb), C(mc),=20 D(md), me_(me) {<BR>    }<BR>    virtual = void=20 foo();<BR>private:<BR>    long me_;<BR>};</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>void E::foo() {<BR>    = A::foo();<BR>    B::foo();<BR>   =20 C::foo();<BR>    D::foo();<BR>    cout = <<=20 hex << "me=3D" << me_ << ", sizeof(E)=3D" << dec = <<=20 sizeof(E) << "\n";<BR>}</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>int main(int, char **) = {<BR>   =20 cout << hex;</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    int distance =3D=20 0;<BR>    int before =3D 0xFE1;</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    E = e;<BR>   =20 if(!distance) { //to prevent compiler from rearanging veriables on the=20 stack<BR>        int after =3D=20 0xFE2;<BR>        distance =3D = &before -=20 &after;<BR>    }<BR>    = e.foo();</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    cout << dec = <<=20 "&before - &after =3D "  << abs(distance) <<=20 "\n";</FONT></DIV> <DIV><FONT face=3DCourier></FONT> </DIV> <DIV><FONT face=3DCourier size=3D2>    return=20 0;<BR>}</FONT></DIV></BODY></HTML> ------=_NextPart_000_002C_01C4577D.73E543F0-- Tag: optional parameter in MIDL with default value Tag: 231908
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    - ListView from namespace system::windows::form Hi, i would like to find an example how to use the ListView from the namespace system::Windows::Forms. including all include, using, and basic code.. i didn't find any help about it on internet...just about C# or VB, but nothing regarding C++. thx, Maileen Tag: optional parameter in MIDL with default value Tag: 231907
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    - Forcing a symbol out of an executable I'm using VC6.0 SP5 and VC.NET 7.1. I have a third-party static library (no source) that when linked into my executable, results in my executable exporting the static library's symbols. I believe it's due to how the static library itself is contructed (I'm not specifying its entry points in a .def file, with a /EXPORTS or /INCLUDE switch, or by __declspec(dllexport) in the source code of my project or any includes) . Is it possible to either: a) Modify the static library to prevent this behavior or b) Explicitly exclude entry points when linking my executable and if so, how? Thanks. -------------------------- Kyle Alons http://www.kinook.com/ Tag: optional parameter in MIDL with default value Tag: 231902
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    - run-time array bounds checking Compiling the program below with MSVC 13.10.3077 for 80x86 using the /GX /GZ /Ge options #include <iostream> using namespace std; int main() { int ix[1]; ix[0] = 3; cout << ix[0] << " " << ix[1] << endl; } produces a compilation warning local variable 'ix' used without having been initialized and output 3 -858993460 Is there an option that will cause the program to terminate at run time (preferably with an informative error message) when trying to access an out-of-bounds array element? If I add the line ix[1] = 4; before the cout the program prints '3 4' and then crashes. It would be better if it crashed at the 'ix[1] = 4;' line. Tag: optional parameter in MIDL with default value Tag: 231901
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    - OO dll backward compactibility problem Hi, I wonder if anyone can give me some advices for this problem. I have been working on some program to interface with some devices and I would like to use the OO model to interface with different devices with different dll. I tried to seperate the design into 3 layers: /* BaseDevice .h */ class EXPORT_DLL_PREFIX BaseDevice{ public: BaseDevice(){} ~BaseDevice(){} virtual void DeviceCallA()=0; }; typedef BaseDevice * (CALLBACK* BASEDEVICE_GET_INSTANCE)(); /* Inherited Device class A DeviceA.cpp */ #include <BaseDevice.h> #static BaseDevice instance = NULL; class EXPORT_DLL_PREFIX DeviceA: BaseDevice { public: DeviceA() {// do something} ~DeviceA() {// do something } DeviceCallA() { // Do the actual work here... } }; BaseDevice * getInstance() { .... instance = new DeviceA(); return instance; } /* upper interface layer upper.cpp */ ... static BASE_DEVICE_GET_INSTANCE getInstance; .... BaseDevice * device; ..... getInstance = (BASE_DEVICE_GET_INSTANCE )GetProcAddress( modHandle, _T( "getInstance" ) ); // link to the (DeviceA.dll) and get the instance... device = getInstance(); device -> DeviceCallA(); .. Turn out it works. However, if I would like to add another method to the BaseDevice.h for the new support device, problems comes up. Any previous application which was developed using DeviceA.dll will not run. I know that it is due to the virtual table ordering when new methods are added. Are there any suggestion to this problem that adding new methods will not affect previously developed applications which used link to the previous version of the dll implementing the previous version of the abstract class? Thanks! Kenric Tag: optional parameter in MIDL with default value Tag: 231900
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    - __loctotime32_t problem in MSVS 8.0 If issues related to MSVS 8.0 should be posted somewhere else, I would appreciate a pointer in the right direction. We are using MSVS 8.0.40426 (pd5.040426-1400) on Win32 XP There looks to be a bug in __loctotime32_t (called from _stati64 which is actually _stat32i64) where EINVAL is incorrectly reported. Here is the code fragment from the Microsoft VC7 CRT. Notice that the first "if" has a side effect of modifying the parameter "yr"; however, the subsequent _VALIDATE_RETURN expects "yr" not to have been changed. Also note that yr is later decremented by 1900 again. __time32_t __cdecl __loctotime32_t ( int yr, /* 0 based */ int mo, /* 1 based */ int dy, /* 1 based */ int hr, int mn, int sc, int dstflag ) { int tmpdays; __time32_t tmptim; struct tm tb; /* * Do a range check on the year and convert it to a delta * off of 1900. */ if ( ((yr -= 1900) < _BASE_YEAR) || (yr > _MAX_YEAR) ) return (__time32_t)(-1); _VALIDATE_RETURN( ( ( ( yr - 1900 ) >= _BASE_YEAR ) && ( ( yr - 1900 ) <= _MAX_YEAR ) ), EINVAL, ( ( __time32_t )( -1 ) ) ) yr -= 1900; -- Jason Hinsperger Product Manager iAnywhere Solutions Tag: optional parameter in MIDL with default value Tag: 231899
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    - Debug/Fig06_05.exe : fatal error LNK1120: 4 unresolved externals i run my program i have this error (i have #include "time.h" in my file ) w--------------------Configuration: Fig06_05 - Win32 Debug-------------------- Linking... Fig06_05.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::setTime(int,int,int)" (?setTime@Time@@QAEXHHH@Z) Fig06_05.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::printStandard(void)" (?printStandard@Time@@QAEXXZ) Fig06_05.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::printMilitary(void)" (?printMilitary@Time@@QAEXXZ) Fig06_05.obj : error LNK2001: unresolved external symbol "public: __thiscall Time::Time(void)" (??0Time@@QAE@XZ) Debug/Fig06_05.exe : fatal error LNK1120: 4 unresolved externals hen Tag: optional parameter in MIDL with default value Tag: 231898
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  - 1
    - main(int argc, char* argv[]) When started from VC6 IDE, I receive 7 arguments in argc/argv. When started from console I receive 8 arguments in argc/argv. What should I do? This is how I strat my console app from debugger: -p1 -p2 -p3 -p4 -p5 -p6 -p7 This is how I start my console app from console: TestApp -p1 -p2 -p3 -p4 -p5 -p6 -p7 I've tryed to add "TestApp" in a front of debugger argument list, but then I have to change argv[3] into argv[4] in my app, if my app was invoked from VC6 IDE, but I don't know if my console app was started from VC6 IDE or console. I'm using Windows XP Pro. Tag: optional parameter in MIDL with default value Tag: 231895
  - 2
    - Download API , help please Hi I wrote a small download manager. Im using IBindStatusCallback and i want to prevent "caching" the files : STDMETHODIMP CBindStatusCallback::GetBindInfo(DWORD* pgrfBINDF, BINDINFO* pbindinfo) { *pgrfBINDF = BINDF_NOWRITECACHE; return S_OK; } But its not working, the data is still cached !!! What am i missing here ? thanks Tag: optional parameter in MIDL with default value Tag: 231890
  - 3
    - A question of SAPI? Hi I want to make a tool, using Microsoft Speech with VC++6.0 . The XP ->Contral panel->Speech->SpeechRecognize we can choose the "Microsoft English Recongizer" or "Microsoft Simplfied Chinese Recongizer" etc...but I want to make it in my tool. Are there any SAPI functions to choose the Recongizer? Thanks in advance Tag: optional parameter in MIDL with default value Tag: 231887
  - 4
    - pre-compiled header file To use pre-compiled header file, for the first time of compiling a project, we have to specify "Not use pre-compiled header file" in the project's Setting options, since there is no .pch file yet and for each project, the .PCH file could be different. Is this correct? In a Windows console program, is the "stdafx.h" header file that determines what to be included in the .PCH file? Is "stdafx.h" header file can be compiled, can other header files like being created by myself be compile as well? Thanks! Tag: optional parameter in MIDL with default value Tag: 231886
  - 5
    - Finding waveIn devices I am trying to read sound from a microphone but I can not make it work. The problem might be that I am using the device. According to waveInGetNumDevs(), I have two devices. My problem is that I do not know what devices they are, I do not know how to find their names and their device ids. In the documentation, they give the device to waveInOpen as WAVE_MAPPER which seems to work as some sort of default device. I can not make this work. (I hate the Visual Studio Help. When I search on DeviceId, I only get fax references. I suppose they are out there somewhere but I could not find any answers to my questions.) Thanks for any answer Anders Floderus -- m a i l : anders d o t floderus a t swipnet d o t se Tag: optional parameter in MIDL with default value Tag: 231881
  - 6
    - Dialog Problem I need to add some design for the background of my Dialog.And I also want to display some text with custom format like changed font and color.What is the ideal control for doing it.Please help.Thanks in advance.Can get me some sample code. Jeevan Tag: optional parameter in MIDL with default value Tag: 231879
  - 7
    - convert string to LPSTR Hi, I know that LPSTR is a char*. I would like to convert a string (from std namespece) to a LPSTR. nowhere i found a tutorial/help about it. i was thining to cast it into char* but it's not correct. thanks for help. Maileen Tag: optional parameter in MIDL with default value Tag: 231873
  - 8
    - Raelian, Normism & Declaration of Heaven on Earth2914 Please visit http://www.normism.org for details! 169292bvktlg169292 bvktlg169292bvktlg ----------------------------------------------------------------------------- --This Message Has Been Posted Using A Trial Version Of Message Poster 2003-- ----------------------------------------------------------------------------- Would you like to reach millions of customers for only the cost of bandwidth? You can post messages like this to thousands of newsgroups with a simple to use software application called Message Poster 2003. For more details on this extremely affordable software, visit: http://www.exibitionsoftware.com Tag: optional parameter in MIDL with default value Tag: 231865
  - 9
    - Convert _bstr_t to c_str Is the following correct? char* c_str; _bstr_t b; ... c_str = b; If correct, how could an ANSI char* pointer get pointing at a memory of unicode string? Thanks! Tag: optional parameter in MIDL with default value Tag: 231861
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    - Smart pointer types of MSXML The code is from MSDN: // Initialize objects and variables. IXMLDOMDocument2Ptr pXMLDoc = NULL; IXMLDOMParseErrorPtr pError = NULL; ... // Clean up and destroy objects. if (pXMLDoc) pXMLDoc.Release(); if (pError) pError.Release(); pXMLDoc and pError seems like pointer type since they are initialized with "NULL". Then how can their member function "Release()" is called using "pXMLDoc.Release()" and "pError->Release()"? What for to call "Release()" here? If to releasing memory, then as smart pointers, they should have already done that at the exit of the scope? How exactly such smart pointer types defined for IXMLDOMDocument2Ptr? Thanks! Tag: optional parameter in MIDL with default value Tag: 231860
  - 11
    - Convert between DWORD and WORD My understanding is that conversion of WORD type data converts to DWORD will not cause loss of any data bits. What happens if converting DWORD to WORD? How to convert "safely" a DWORD that has a value within the range of WORD? Thanks! Tag: optional parameter in MIDL with default value Tag: 231854
  - 12
    - vector and class - end Hi, i have the following class : class Book { string Category; string SubCategory; Book(string Cat, string SubCat) { Category = Cat; SubCategory = SubCat; }; }; in my cpp file, i use a vector of this class: vector<Book> My_Book; My_Book.push_back(Book("Cat1","SubCat1")); My_Book.push_back(Book("Cat2","SubCat2")); My_Book.push_back(Book("Cat3","SubCat3")); // this works great...but how can i display later my data ? i tried : char buf[1024]; for(int i=0;i<My_Book.size();i++) { wsprintf(buf,"Element %d : %s\n",i+1,&My_Book.at(i).Category); TRACE(buf); } but it doesn't work... i mean &My_Book.at(i).Category i have partially good result...but just partially :( something like : IIIICat1 and IIIIcat2,.... thx for help, Maileen Tag: optional parameter in MIDL with default value Tag: 231851
  - 13
    - strange behavior of Vector Hi, I'm still working on my Book Class using vector. due to a strange behavior of vector function : push_back(), i decided to do a simple test. the result is absolutely the same...it's to say : I wrote this : //------------- vector<int> Pokus; Pokus.push_back(10); Pokus.push_back(20); when i control in my Local window the values, i have : Pokus _MyFirst 10 _MyLast *? a random value but not 20 _Myend *? the same random value than _MyLast so i was thinking that push_back function reallocate memory in case of need...but it seems to not work. Does anyone already had this behavior or just me ? thx, Maileen Tag: optional parameter in MIDL with default value Tag: 231844
  - 14
    - ListView from namespace System.Windows.Forms.TreeView Hi, I'm trying to use the ListView available in the namespace System.Windows.Forms.TreeView. But impossible to make it run....i tried : using namespace System::Windows::Forms::TreeView; how i can get access to this namespace in order to use this LIstView control ? thanks, Maileen Tag: optional parameter in MIDL with default value Tag: 231839
  - 15
    - Class constructor limited in parameter ? Hi, I'm still with my vector and my Book class. I have a strange behavior during construction of my class. I my class constructor as 5 parameters it works, if it has 6 parameter, VC.NET returns me an error : error C2059: syntax error : ')' here is code : class Book { public: std::string Category; std::string SubCategory; std::string Title; std::string Author; int Pages; int Year; std::string Publisher; std::string Format; std::string Description; std::string Language; std::string Image; std::string Information; // constructor Book(std::string Arg_Category, std::string Arg_SubCategory, std::string Arg_Title, std::string Arg_Author, int Arg_Pages, int Arg_Year, std:string Arg_Publisher) : Category(Arg_Category), SubCategory(Arg_SubCategory), Title(Arg_Title), Author(Arg_Author), Pages(Arg_Pages), Year(Arg_Year), Publisher(Arg_Publisher) { } }; this work when i use : std::vector<Book> Books; Books.push_back(Book("Category_1", "SubCategory_1", "Title_1","Author_1", 588, 2004, "Publisher_1")); but if in my class i have as constrcutor: Book(std::string Arg_Category, std::string Arg_SubCategory, std::string Arg_Title, std::string Arg_Author, int Arg_Pages, int Arg_Year, std:string Arg_Publisher, std::string Arg_Format) : Category(Arg_Category), SubCategory(Arg_SubCategory), Title(Arg_Title), Author(Arg_Author), Pages(Arg_Pages), Year(Arg_Year), Publisher(Arg_Publisher),Format(Arg_Format) { } and i initialize it as such : std::vector<Book> Books; Books.push_back(Book("Category_1", "SubCategory_1", "Title_1","Author_1", 588, 2004, "Publisher_1", "Format_1")); i get error written above :( so, Is there any limitation for the number of parameters in constructor ? if yes (and i've never seen it), how can i initialize more parameters ? thx, Maileen Tag: optional parameter in MIDL with default value Tag: 231833
  - 16
    - Cannot add fields at runtime to a CDaoRecordSet class I solved this once before using VC++ and CDaoRecordSet, but I am looking for a better solution - even though I have the sinking feeling that what I am attempting to accomplish is not possible. Here is the issue (at least a pared down version of it): My VC++ MFC application has a Microsoft Access file Networks.mdb which currently has six fields. The problem arises when I want to add another (or seventh) field. There is no problem updating the CPP (or class file) for this file - Networks.mdb. I am able to successfully bind a new variable for the new field. But of course this means I can no longer read the old MDB file without throwing an exception. Which is not unexpected since the number of elements (6) no longer matches the new class file where m_nFields is now set to 7. So my question is there a way to open this mismatched MDB file at runtime so that I can retrieve the records and safe them in the new MDB file. Of course the added problem is both MDB files have the same name. TIA. Michael T. Tag: optional parameter in MIDL with default value Tag: 231820
  - 17
    - bool and == Hi, Can the == operator be used with bool? Is this valid? //////////// bool a, b; bool c = a == b; //////////// Thanks, Nelson Tag: optional parameter in MIDL with default value Tag: 231815
  - 18
    - Object properties change without reason Hi Consider an object from a child class B with the parent class A. I create an Object of class B in a function that can return a pointer to the class A, then I return the Object's pointer through the function. After examining the returned Object in debug mode, like (B *) ReturnedObject, I see that some properties has got invalid. These properties are pointers to other objects of the other classes that I had created in the function and gave their pointers to my Object. But after returning it these sub-objects are gone!! Can anyone help? Mehran Ziadloo Tag: optional parameter in MIDL with default value Tag: 231811
  - 19
    - Using C++, how can I check the existence of a directory? Hi, Using Microsoft Visual C++ ver 6.0, I need to check if a directory exists. I am using PathIsDirectory() function and I included <shlwapi.h> in my file. I am calling PathIsDirectory() inside a class virtual member function. When I try to build the program I am getting these 2 errors: error LNK2001: unresolved external symbol __imp__PathIsDirectoryA@4 fatal error LNK1120: 1 unresolved externals How can I fix these errors? Is there any other function that I can use? Thank you Tag: optional parameter in MIDL with default value Tag: 231806
  - 20
    - Can someone explain why Intellisense does not wotk here? - VC6 struct projectStructure { int mgrItem; int buyrItem; int decisionItem; int artItem; int cpyItem; int advItem; int lstItem; int lblItem; int prnItem; int afixItem; int delvrItem; }; typedef struct projectStructure project; //This is in a c source file. When I type: int main() { project july4sale; july4sale.artItem=20 .... } I do not get intellisense at this point july4sale. Nothing happens = after I type the period. I know it works the code seems correct but = intellisense doesn't work. What have I done wrong? Thanks. Visual C++ = 6 SP5 Windows 2000. --=20 George Hester __________________________________ Tag: optional parameter in MIDL with default value Tag: 231801
  - 21
    - Perhaps a VC++ compiler error Well I'm not sure who's fault is it, me or VC++ compiler!! I wrote a program which works with files in hard disk and it just reads them through "ifstream". This program of mine acts so strange, when I compile it as a release version, it works perfectly but when I compile it as a debug version, it cuases error and abnormal termination!! Can I do anything wrong to make such an error? I'm using VC++ 7.0 in visual studio .Net but without .Net framework. Please help... Mehran Ziadloo Tag: optional parameter in MIDL with default value Tag: 231798
  - 22
    - C++ Object size Hello all, I want to find out is how much memory is being used by each class (and thus the object) in my application. This includes differentiating between the memory allocated for functions and memory allocated for static data (like arrays, constants etc.) Does anyone know of any utility that will allow me to obtain this information AFTER linking my application with other libraries? I tried to interpret the linker generated MAP file for this, but there seems to be no documentation on MSDN to interpret the keywords in the MAP file. If not another utility, does anyone know how to interpret the MAP file for individual objects/classes? Thanks, Adwait Tag: optional parameter in MIDL with default value Tag: 231790
  - 23
    - class constructor error Hi, I have a stupid error message from VC++.NET. I did a mistake but i don't see where :( here is my class : class Book { public: int Pages; Book(int Arg_Pages) : Pages(Arg_Pages) { } }; error message is : error C2512: 'Book::Book' : no appropriate default constructor available where is the error ? thx, Maileen Tag: optional parameter in MIDL with default value Tag: 231789
  - 24
    - LogonUser and ImpersonateLoggedOnUser Hi! I'm developing the setup of an application. It needs to write in registry and extract files on certain directories. The files are extracted using scripting interface (JScript) processed in my setup using odl to define new functions. The setup evaluate if current user have administrator privileges and, if he doesn't have them, it let you introduce username and password and change the current user with LogonUser and ImpersonateLoggedOnUser. This actions are done at the beginning and goes well (I can write in local machine entry of registry), but, when I extract files, the administrator privileges are lost. Does anyone knows how to resolve this? Does the scripting machine have their own privileges or is it multithread or something? Thanks at all Jordi Tag: optional parameter in MIDL with default value Tag: 231783
  - 25
    - How to catch "integer division by zero" exception In VC7, Division by zero will cause system to throw an exception, I do not konw the exception type, I can only catch it by catch(...){} but, it's no use, because I do not know what the exception really was. Other run time exceptions, such as access violation, have the same problem. I can not find the exception types in the document. Dose some one know the exception type or know how to catch those exceptions? Thanks a lot. Tao Bo Tag: optional parameter in MIDL with default value Tag: 231780

MDIL support optional parameters with default values like the following:
interface IMyInterface : IUnknown
{
HRESULT MyFunction([in, optional, defaultvalue("")] BSTR bstrName);
}
MDIL will also generate the .h file as
HRESULT MyFunction(BSTR bstrName = L"");

Does anyone know if I can use C++ to implement a class to support this interface? What is the syntax for this function? Is it the same as what I see in the MIDL generated .h file?
My purpose is to call this function in my C++ client in both the following format
MyInterfacePointer->MyFunction();
and
MyInterfacePointer->MyFunction(bstrName);
Can anyone tell me if this is feasible or not?

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