Re: Can someone explain how these operator is suppose to work

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 - Can someone explain how these operator is suppose to work Hello, I'm using a 3:rd party library and in one class I have a protected variable that I need to get. I see that the creator of the class has two operators that seem to be the trick to get the value but I don't get how to use the operators. The class looks like this Class CYObject { protected: xObject* m_pObject; // a number of other variables... public: xObject& operator*(){ return *m_pObject;} xObject* operator->(){ return m_pObject;} } If I have an instance of CYObject called myObject how do I get the myObject->m_pObject?? // Anders -- English is not my first, or second, language so anything strange, or insulting, is due to the translation. Please correct me so I may improve my English! Tag: Re: Can someone explain how these operator is suppose to work Tag: 277262
 - 2
 - Faster to assign null pointer.... Is it faster to check for NULL function pointers or to assign a dummy function that does nothing? if(fp != NULL) fp->somefunction(); //some function does something or just assign dummy function that does nothing fp->somefunction(); //does nothing. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277255
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 - Warning C4996 How can I get rid of the following warning C4996 (only using checked_copy doesn't solve the problem): warning C4996: 'std::copy': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' Tag: Re: Can someone explain how these operator is suppose to work Tag: 277254
 - 4
 - How to save data to Access database file! Hi All, Good afternoon, I am working on winamp general purpose pluggin "gen_whatsplaying " project downloaded from the site www.schaffrath.net I compiled and build the project successfully using platform SDK Feb 2003 and Speech SDK5.1. Now the winamp plugins "gen_whatsplaying" interface saving the data related to songs currently being played by Winamp to a specified text file. such as time the song starts playing, name of the song currently being played etc. depending on the parameters specified in the pluggin's template file. Now, I want to save the data directly to a MSAccess database file, which is currently being saved in a text file, such as time the song starts playing, name of the song currently being played etc.depending on the parameters specified in the pluggin's template file. e.g. "6:23:39 PM- D:\shaan\03 WOH PEHLI BAAR.mp3" this information I want to store in two different field of Access database table. please let me know how do I do that? Do I need to use ADO and other library to get the connectivity with MSAccess db first? Let me know if you have any idea about it. I really appreciate yours help and kind cooperation with me. Thanks, shyam Tag: Re: Can someone explain how these operator is suppose to work Tag: 277236
 - 5
 - Implicitly loaded dll question Hi, I am using a dll in my program which is loaded implicitly (using .h and .lib files). This is working fine. But in this case i don't have privilege to load this dll only if certain criteria is met. I don't want to change the already written code to explicit linking. Is there anyway that i load the dll only if certain flag is set ? Thanks Ashok Tag: Re: Can someone explain how these operator is suppose to work Tag: 277232
 - 6
 - general exception If you catch a general exception with catch(...), is there an easy way to figure out what type of exception you caught? Thank you. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277222
 - 7
 - write to file with no used of buffered-IO functions Hello, How can I write to file 100,000 blank characters, not by using fwrite, so I shall not use a buffered-IO ? I want to write 100,000 bytes, with one signal I/O command (and not using a buffer with 100,000 size long). Thanks :) Tag: Re: Can someone explain how these operator is suppose to work Tag: 277212
 - 8
 - C++ quirks - frustrated with secure CRT [long] Hi everyone, I've been researching and asking this question around quite a lot today without a satisfactory answer. I have difficulties interpreting the documentation for the secure version of some CRT methods and I would like to know some opinions if you would care to share. As a rule, it seems that most of them take an extra parameter of type size_t which is usually called sizeofbuffer which - despite the name hint that a C\C++ programmer would take it as indication that the byte size is what needed to be passed - actually requires the number of elements in the array to be passed and , considering wide char versions as well as TCHAR versions the documentation insists that one passes _countof instead of _sizeof where that parameter is required: TCHAR buffer[512]; _secure_method_s(buf, _countof(buffer),...);//good!! _secure_method_s(buf, _sizeof(buffer),...);//bad!! as exemplified by _tcscpy_s sample from MSDN: errno_t _tcscpy_s( TCHAR *strDestination, size_t numberOfElements, const TCHAR *strSource ); strDestination Location of destination string buffer numberOfElements Size of the destination string buffer.//jabba : oh well let's not be explicit here strSource Null-terminated source string buffer. MS sample: char string[80]; // of course we can supply the size explicitly if we want to: strcpy_s( string, _countof(string), " strcpy _s!" ); //note usage of _countof But witness definition of _vsntprintf_s int _vsntprintf_s( TCHAR *buffer, size_t sizeOfBuffer, size_t count, const TCHAR*format, va_list argptr ); Parameters buffer Storage location for output. sizeOfBuffer The size of the buffer for output./*note jabba : size expressed as WHAT?????Can't you give me more info than what is already comprised in the name of the parameter????*/ count Maximum number of characters to write (not including the terminating null), or _TRUNCATE. format Format specification. argptr Pointer to list of arguments. It would seem (by hints of the naming used for parameters, not through explicit parameter documentation )that sizeOfBuffer refers to the actual size in bytes of the buffer so a good call would be int nSize = 0; TCHAR buff[10]; memset(buff, 0, sizeof(buff)); va_list args; va_start(args, formatstring); nSize = vsntprintf_s( buff, sizeof(buff), _TRUNCATE, formatstring, args); MS being the nice guys that they are only provide a regular char sample: int nSize = 0; char buff[10]; memset(buff, 0, sizeof(buff)); va_list args; va_start(args, formatstring); nSize = vsnprintf_s( buff, sizeof(buff), _TRUNCATE, formatstring, args);//hello what am I supposed to infer??? That is byte size of course!!! Ha! But look what the vswprint.c (CRT source code) definition looks like: int __cdecl _vsnwprintf_s ( wchar_t *string, size_t sizeInWords,<-----exactly the opposite hint! size_t count, const wchar_t *format, va_list ap ) So it looks like they expect you to pass the count of elements in the array instead of its byte size. I can produce this kind of open to interpretation MSDN documentation for a lot of other secure CRT methods. Anyone has any experience with this that can confirm whether all of the secure methods require consistently the buffer's byte size or all of them require the element count or does it really vary from method to method and what's the definitive hint on which one to pass? Thanks, Jabba Tag: Re: Can someone explain how these operator is suppose to work Tag: 277205
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 - How to keep a Dialog's width and height in a solid ratio Inv: WindowsXP, VC++6.00 I made a sub dialog window with alterable size. Now I need the width and height kept a solid ratio while changing. I tried as follows, in void CDlg1::OnSize(UINT nType, int cx, int cy) { CDialog::OnSize(nType, cx, cy); cy = cx * 3 / 4 ; SetWindowPos( &wndTop, 0, 0, cx, cy, SWP_NOZORDER|SWP_NOMOVE|SWP_SHOWWINDOW ); } But it doesn't work. Please help. William Tag: Re: Can someone explain how these operator is suppose to work Tag: 277198
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 - Register arrangement I have 2 pieces of code that demostrate the order of registers that are manipulated in disassemblers... Code 1) #define rAX 1 /* These are numbered relative to real 8086 */ #define rCX 2 #define rDX 3 #define rBX 4 #define rSP 5 #define rBP 6 #define rSI 7 #define rDI 8 #define rES 9 #define rCS 10 #define rSS 11 #define rDS 12 #define rAL 13 #define rCL 14 #define rDL 15 #define rBL 16 #define rAH 17 #define rCH 18 #define rDH 19 #define rBH 20 Code b) enum RegNo { R_ax = 0, R_cx = 1, R_dx = 2, R_bx = 3, R_sp = 4, R_bp = 5, R_si = 6, R_di = 7, R_r8 = 8, R_r9 = 9, R_r10 = 10, R_r11 = 11, R_r12 = 12, R_r13 = 13, R_r14 = 14, R_r15 = 15, R_al = 16, R_cl = 17, R_dl = 18, R_bl = 19, R_ah = 20, R_ch = 21, R_dh = 22, R_bh = 23, R_spl = 24, R_bpl = 25, R_sil = 26, R_dil = 27, R_ip = 28, R_es = 29, // 0 R_cs = 30, // 1 R_ss = 31, // 2 R_ds = 32, // 3 R_fs = 33, R_gs = 34, }; If I were to put eax and ebx... (32-bit registers) into these tables, where do you see fit? Thanks Tag: Re: Can someone explain how these operator is suppose to work Tag: 277189
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 - namespace trouble Hi, one of the "typedefs" of .NET 2002 Platform SDK has a namespace conflict with my third party library. Changing either of them would cause compilation failure. What can I do in this situation? 1) typedef enum { FUNC_STATIC .... }; 2) #define FUNC_STATIC 0x0000001L Any hints? Thanks in advance Tag: Re: Can someone explain how these operator is suppose to work Tag: 277188
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 - LINK : fatal error LNK1104: cannot open file "nafxcwd.lib" Hi all, I'm a C newbie in a desperate need of help. My background isn't programming but engineering, so my programming skills are somewhat limited (I am able to write simple single-threaded progs in C, but hardly more than that). It just happened that my work requires me to take a program and strip it off all kind of GUI, make it just a simple command prompt thingie. And so I did, more or the less. Now, I didn't remove any includes or anything of a kind, but my stripped proggie consistently refuses to link (compiling is OK) and the error I get ts the one in the subject. I searched all of my hard drive, this file doesn't exist on it. But the original program never "jumped" on it, as if it never required it in a first place. As I said I never added anything to the program, only removed some of the GUI related code... And the new program seems to require something that the old one never did... I'm open to any suggestions, as due to my limited programming skills I just don;t know where to look for the problem's root. Thanks! Tag: Re: Can someone explain how these operator is suppose to work Tag: 277186
 - 13
 - W.Forms Hi every body. The code written down (by C++/ CLR console). How can I compile it by Windows Form. Can any persn wants to help?? Thanks Beginner +++++++++++++++++++++++++++++++++++++++++++++ #include "stdafx.h" using namespace System; int main(array<System::String ^> ^args) { int magic; int guess; Console::Write(L"Enter Your Guess Number : "); guess=Convert::ToInt32(Console::ReadLine()); if(guess==7) { Console::WriteLine(L" Bravo it's Magic Number"); } else { Console::WriteLine(L" Sorry Not Magic Number"); } return 0; } Tag: Re: Can someone explain how these operator is suppose to work Tag: 277185
 - 14
 - delete vs delete[] I was just wondering why the compiler won't warn you when you try to do this: TCHAR *t = new TCHAR[20]; delete t; Also, how exactly does the behavior of that differ from the correct way: TCHAR *t = new TCHAR[20]; delete[] t; Thank you. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277178
 - 15
 - Could u suggest a book for windows sdk freshman? as title Tag: Re: Can someone explain how these operator is suppose to work Tag: 277175
 - 16
 - CPU Time On a dual-processor PC, what's the so-called CPU time per process telling us? Is it the total time that the said process has been given to run on either of the two processors? What's the relation between CPU time and system time span between the start and stop time of the process? Tag: Re: Can someone explain how these operator is suppose to work Tag: 277172
 - 17
 - saving data from Text file to MSAccess database!! Hi All, I am working on winamp general purpose pluggin "gen_whatsplaying " project downloaded from the site www.schaffrath.net I compiled and build the project successfully using platform SDK Feb 2003 and Speech SDK5.1. Now the winamp plugins "gen_whatsplaying" interface saving the data related to songs currently being played by Winamp to a specified text file.such as time the song starts playing, name of the song currently being played etc. depending on the parameters specified in the pluggin's template file. Now I want to save the data which is currently being saved in a text file,to a MsAccess Database table. Just wanted to know if any one knows about it in this community to help me out.Do I need to use ADO and other library to get the connectivity with MSAccess db first? Anyway please let me know, if someone have any idea about it. I really appreciate yours help and kind cooperation with me. Thanks, shyam Tag: Re: Can someone explain how these operator is suppose to work Tag: 277168
 - 18
 - crashes in release mode If you have a program that only crashes in release mode, is there an easy way to figure out what piece of code is causing the crash? Thank you. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277155
 - 19
 - local type as template argument Hello all, I wonder whether anyone has seen a workaround for this somewhere, perhaps in Boost or elsewhere... I succeeded using a local type as template argument in MSVC 8.0, but I found out that this violates the standard (14.3.1.2), and sadly does not work with g++. I was essentialy able to run some code for each local type before main() - see the source code below. Thanks for suggestions, Filip #include <iostream> #include <list> using namespace std; // common interface struct XC { virtual const char* get_data() = 0; virtual ~XC() {} }; typedef list<XC*> XCL; XCL global_list; template<typename Y> struct X : public XC { X() { // make this instance globally accessible... // this runs before main() for each X // instantiation global_list.push_back(this); } virtual const char* get_data() { return get_data_static(); } static X initializer; // return data associated with Y static const char* get_data_static() { return data; } // data associated with Y static const char* data; }; template<typename Y> const char* X<Y>::data=Y::getYData(); template<typename Y> X<Y> X<Y>::initializer; int main(int argc,char* argv[]) { // the local type whose data // will be visible globally struct Y { static const char* getYData() { return "some data"; // make sure X<Y>::initializer exists X<Y>::initializer; } }; // walk the list of X specializations: XCL::iterator i, e=global_list.end(); for(i=global_list.begin(); i!=e; ++i) cout << (*i)->get_data() << endl; // use X<Y> directly: cout << X<Y>::get_data_static() << endl; return 0; } Tag: Re: Can someone explain how these operator is suppose to work Tag: 277153
 - 20
 - variable arg list issue with reference types Hi, I encountered a problem with variable-arg-list functions and MSVC.NET and MSVC2005 compilers. It seems like having the starting variable (in va_start) as a reference type messes up the values returned by va_arg(). See the enclosed code and output. NB: this works fine with GCC 4.x. Thanks, Cyril ------------------------------------------------------------------- CODE: #include <string> #include <iostream> #include <stdarg.h> using namespace std; string print_int(const char *format, ...) { va_list varg; va_start(varg, format); char res[1000]; sprintf_s(res, format, va_arg(varg, int)); va_end(varg); return res; } string print_int(const string *format, ...) { va_list varg; va_start(varg, format); char res[1000]; sprintf_s(res, format->c_str(), va_arg(varg, int)); va_end(varg); return res; } string print_int(const string &format, ...) { va_list varg; va_start(varg, format); char res[1000]; sprintf_s(res, format.c_str(), va_arg(varg, int)); va_end(varg); return res; } int main() { cout << print_int("overload print_int(const char*, ...) --> %d", 10) << endl; string s1 = "overload print_int(const QString*, ...) --> %d"; cout << print_int(&s1, 10) << endl; string s2("overload print_int(const QString&, ...) --> %d"); cout << print_int(s2, 10) << endl; return 0; } ------------------------------------------------------------------- OUTPUT: overload print_int(const char*, ...) --> 10 // ok overload print_int(const QString*, ...) --> 10 // ok overload print_int(const QString&, ...) --> -858993460 // messed up Tag: Re: Can someone explain how these operator is suppose to work Tag: 277146
 - 21
 - hi..it is very easy way to earn money Hi, mGinger.com pays you to read ads on your cellphone! These ads are only about your interests. Not only that, you get to decide when you want these ads. Based on my calculations I can easily make enough money to free up my cell phone bill. Check it out... http://www.mginger.com/index.jsp?inviteId=102083 I joined this site before 1 month.. Now I earn 10000 Rs in this month... I couldnt believe this.... It is amazing.... Thanx a lot MGinger...... u r greatttttttt........ Tag: Re: Can someone explain how these operator is suppose to work Tag: 277140
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 - how to access map<map<ea_t, byte>, flg> How to access the field 'flg'? Thanks Tag: Re: Can someone explain how these operator is suppose to work Tag: 277117
 - 23
 - why char cast to int become strange ? Hi, All: I've a VC 2003 code when I cast it to int, the data become strange, would you tell me why ? here is the code & example. code : char psData[4]; int value; value = (int)(*psData); example: psData[0] = 0x8E; psData[1] = 0x00; psData[2] = 0x00; psData[3] = 0x00; original I hope the value is 8E, but it fail, it become to FFFFFF8E. Regards. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277106
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 - Compulsory mapping location Hi Is it possible to force MapViewOfFile to map a module on disk to a same location as the loader when the module is loaded as a process? For example: 123.exe -> ImageBase = 0x400000 When doing map, the mapped pointer is also 0x400000 Thanks Tag: Re: Can someone explain how these operator is suppose to work Tag: 277103
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 - Calculate exponent Env: WindowsXP, VC+6.00 int a = 0, 1, 2, 3, 4, 5, ... int b = 1, 2, 4, 8, 16, 32, ... We can get "b" from "a" by the following ways. Method1: b = pow(2,a); Method2: b = 1 << a; But how can I get "a" from "b"? TIA William Tag: Re: Can someone explain how these operator is suppose to work Tag: 277094
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 - Using ArraySize with a pointer to a strucure. Possible? Suppose I have the following: struct XMLImportField { LPCTSTR pszXMLFieldName; long lFieldID; }; struct XMLImportRecord { long lRecordID; XMLImportField* pFields; }; struct XMLImportField xmlW2Fields[] = { // XML Field Name Field { _T("W2EmployerName"), 27039 }, { _T("Address"), 27031 }, }; struct XMLImportField xmlW2StateFields[] = { // XML Field Name Field { _T("W2StateTax"), 62621 }, }; struct XMLImportRecord xmlW2[] = { // Record ID XML Fields { 5002, xmlW2Fields }, { 22730, xmlW2StateFields }, }; In some function, I could get the array size of xmlW2Fields with ARRAYSIZE(xmlW2Fields) and it would return 2. ARRAYSIZE(xmlW2StateFields) would return 1. But, if I want to abstract this. XMLImportRecord* pImportRecord = xmlW2[0]; // xmlW2Fields is there any way to use ARRAYSIZE with pImportRecord->pFields? ARRAYSIZE(pImportRecord->pFields) generates a template compiler error. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277092
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 - text parsing I don't do much programming, so I'm seeking some assistance with a rather simple task. I need to parse a command line input and separate the flags from the command for inputting into CreateProcess. For example, if lpCmdLine is of type LPTSTR and hase a value of "cmd.exe / t:fc /q", I need to divide the string such that one string is of type LPTSTR and equals "cmd.exe" and the other string is also of type LPTSTR and equals "/t:fc /q". This seems easy, but I just haven't figured it out yet and I'd rather get help than spend all the time trying to figure it out myself. Thanks in advance! Tag: Re: Can someone explain how these operator is suppose to work Tag: 277090
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 - sending CB_ADDSTRING to Forms::ListBox Hi, I am trying to add items to a listBox, before it is visualized. Form1 ^ iForm1 = gcnew Form1(); ... SendMessage((HWND)iForm1->listBox1->Handle.ToPointer(), CB_ADDSTRING, 0,(LPARAM)TEXT("ABC")); ... Application::Run(iForm1); Unfortunately, the listBox is not being updated. Any Idea? Thanks, MT Tag: Re: Can someone explain how these operator is suppose to work Tag: 277089
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 - how to show my Dialog? I design a program that include a menu and a dialog. But It cant work. I dont know what happening. Could u tell me how to solve it? My program is following: resorce.rc include a menu and dialog win.cpp #include <windows.h> #include "commctrl.h" #include "resource.h" #include "Dlgs.h" //#include <iostream> //using namespace std; HINSTANCE hInst; LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); BOOL CALLBACK TestDlgProc(HWND,UINT,WPARAM,LPARAM); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow) { static TCHAR szAppName[]="MyApp"; HWND hWnd; MSG msg; WNDCLASSEX wndclass; wndclass.cbSize=sizeof(wndclass); wndclass.style=CS_HREDRAW|CS_VREDRAW; wndclass.lpfnWndProc=WndProc; wndclass.cbClsExtra=0; wndclass.cbWndExtra=0; wndclass.hInstance=hInstance; wndclass.hIcon=LoadCursor(NULL,IDI_APPLICATION); wndclass.hCursor=LoadCursor(NULL,IDC_ARROW); wndclass.hbrBackground=(HBRUSH)(COLOR_WINDOW+1); wndclass.lpszMenuName=MAKEINTRESOURCE(IDR_MENU1); wndclass.lpszClassName=szAppName; wndclass.hIconSm=LoadIcon(NULL,IDI_APPLICATION); RegisterClassEx(&wndclass); hInst=hInstance; hWnd=CreateWindow(szAppName,"¨ç¦¡¥Ü½d",WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT, NULL,NULL,hInstance,NULL); ShowWindow(hWnd,iCmdShow); UpdateWindow(hWnd); while(GetMessage(&msg,NULL,0,0)) { if(hDlgModeless||!IsDialogMessage(hDlgModeless,&msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hWnd,UINT iMsg,WPARAM wParam,LPARAM lParam) { HDC hDC; switch(iMsg) { case WM_CREATE: return 0; case WM_PAINT: { PAINTSTRUCT ps; hDC=BeginPaint(hWnd,&ps); EndPaint(hWnd,&ps); } return 0; case WM_COMMAND: switch(LOWORD(wParam)) { case ID__40001: MessageBox(hWnd,"¨ç¦¡¿ï³æÂI¿ï°T®§¥Ü½d","§Ú¬O¨k¤H",MB_OK); return 0; case ID__40002: DestroyWindow(hWnd); return 0; case ID_40007: if(!hDlgModeless) { hDlgModeless=CreateDialog(hInst,"IDD_DIALOG1",hWnd,(DLGPROC)TestDlgProc); } //MessageBox(hWnd,"°ò¥»¸ê®Æ¿é¤J","§Ú¬O¨k¤H",MB_OK); return 0; } break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd,iMsg,wParam,lParam); } BOOL CALLBACK TestDlgProc(HWND hDlg,UINT uMsg,WPARAM wParam,LPARAM lParam) { switch(uMsg) { // case WM_INITDIALOG: case WM_COMMAND: case ID_OK: DestroyWindow(hDlg); return(TRUE); case ID_CANCEL: DestroyWindow(hDlg); return(TRUE); } } Tag: Re: Can someone explain how these operator is suppose to work Tag: 277087
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 - Exception handling from a dll I am calling into a dll from a simple driver. the dll has a number of exported function (extern "C") I have enabled the compiler switch /EHs to assume that extern C functions can throw an exception. If I raise an exception in the dll the exception is never caught by the drivers catch handler So from the driver : try { // call into the dll LibraryFunctionCall(); } catch(...) { ... } the LibraryFunctionCall simply generates a throw 1 but it never gets caught by the driver, instead generates a "First-chance exception at 0x7c812a5b in clientDriver.exe: Microsoft C+ + exception: int at memory location 0x0012feb0.." >From the Microsoft MSDN it seems that this should be possible. Thanks for your help. Tag: Re: Can someone explain how these operator is suppose to work Tag: 277085
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 - Unicode supported Gujarati Language fonts Do you have other than 'Shruti' font which supports Gujarati Language? Tag: Re: Can someone explain how these operator is suppose to work Tag: 277074
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 - LNK2020 problem with VC++ express and Directshow Hi, I am having trouble compiling a Directshow class with the VC++ 2005 Express Edition. I have the following installed and configured the include/lib/bin directories to include the sdk. VC++ 2005 Platform SDK 2003 R2 - Windows Core Platform SDK 2003 R2 - DirectShow Platform SDK 2003 R2 - Web Workshop DirectX SDK (April 2007) However, when I tried to compile and link, the following errors occur VMR_Capture.obj : error LNK2020: unresolved token (0A0000FA) CLSID_VideoInputDeviceCategory VMR_Capture.obj : error LNK2020: unresolved token (0A0000FB) CLSID_SystemDeviceEnum VMR_Capture.obj : error LNK2020: unresolved token (0A0000FC) IID_ICreateDevEnum VMR_Capture.obj : error LNK2001: unresolved external symbol _CLSID_VideoInputDeviceCategory VMR_Capture.obj : error LNK2001: unresolved external symbol _IID_ICreateDevEnum VMR_Capture.obj : error LNK2001: unresolved external symbol _CLSID_SystemDeviceEnum Do anyone knows what the problem is? These symbols are part of Uuids.h and its been included in dshow.h Thanks in advance Tag: Re: Can someone explain how these operator is suppose to work Tag: 277066
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 - copying file from samba server to windows machine Hi all, I have a exe file on the samba server \\fs\kunal which i need to copy to windows machine(local machine) programatically......how do i specify the path of server in CopyFile() api Tag: Re: Can someone explain how these operator is suppose to work Tag: 277064
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 - #ifdef inside macro expansion Hello, I have the following code: ======== void function( const char * ) ; #define CALLF( string ) function( string ) int main() { CALLF( #if 1 "string" #endif ); } ======== Microsoft compilers are unable to compile the code. The compilers I tested are the following: - Orcas Beta1, version 15.00.20404 for 80x86 - VS2005 SP1, version 14.00.50727.762 for 80x86 - XDK April2007, version 14.00.5603 for PowerPC (The newest version of GCC as well as Comeau C++ compile the code and it works as intended, i.e. passes "string" to f.) The error message given is the following: ==== vm.cpp(9) : error C2121: '#' : invalid character : possibly the result of a macro expansion vm.cpp(9) : error C2143: syntax error : missing ')' before 'if' vm.cpp(9) : error C2660: 'function' : function does not take 0 arguments vm.cpp(9) : error C2121: '#' : invalid character : possibly the result of a macro expansion vm.cpp(9) : error C2059: syntax error : ')' ==== The reason is that preprocessor does not remove the #if directive, so the preprocessed output looks like this: ==== void function( const char * ) ; int main() { function( #if 1 "string" #endif ); } ==== I tried to check the C++ and C99 standards to see whether or not this is a bug in the compiler, but I haven't really found the answer. I'd like to ask the people who know the standards and who read this forum whether compilers should work with this code or whether the behavior is undefined in the case of preprocessor directives inside macro expansion. The workaround is simple (not using preprocessor directives inside macro expansion), so I'm only asking on ideas whether or not this is a bug in the compiler that I should report via the MS connect site. Thanks in advance -- Michal Rehacek Mindware Studios Tag: Re: Can someone explain how these operator is suppose to work Tag: 277062
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 - VC++ DLL UPGRADE Hi Masters, I am supposed to migrate dlls which are written in Visual C++ 6.0 to Visual C++ 2005. As I am an absolute beginner, I would like to know what would be the right approach for this. Also I shall be highly grateful if anyone can suggest me links to sites or books which may help accomplishing this. Best Regards, Sudhansu Tag: Re: Can someone explain how these operator is suppose to work Tag: 277061
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 - If I dont use MFC. Can I design a button or a text box in my window? I want to write a application to learn the window program design knowlege. I dont know how to do it. Can you give me a suggestion ? Thanx FlyR Tag: Re: Can someone explain how these operator is suppose to work Tag: 277056
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 - VC++ 6.0 is not supporting the Platform SDK! This is a multi-part message in MIME format. ------=_NextPart_000_0142_01C7971E.A9E61630 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear sir/madam, I am working on winamp general purpose pluggin "gen_whatsplaying " = project I downloaded the project "gen_whatsplaying" available on = www.schaffrath.net=20 . I am working on it, but getting many errors during compilation and = building=20 the application successfully. I am using MS VC++ 6.0 compiler to compile = and=20 build it. I also downloaded and installed the speech SDK 5.1 from MS site and = Winamp=20 SDK's from Winamp's web site on my PC to remove the errors. But still I = am=20 getting many compilation and linking errors during the build, and = therefore=20 unable to get the desired .dll file for winamp general plugins. As suggested by the project developer, and as per microsoft = specification, I=20 downloaded and installed the February 2003 version of the Platform SDK = on=20 my C:\ drive and configured it to use with VC++ 6.0 Now , after making all the changes to configuration setting to include = and=20 lib, in VC++ 6.0 when I am building the project, I didn't see any = changes in=20 the previous errors which I used to get during compilation before it all = remains the same, no changes at all. I think VS 6.0 is not supporting = the=20 "February 2003 version of the Platform SDK at all. Just wanted to know if any one knows about it in this community to help = me=20 out. I really appreciate yours help and kind cooperation with me. I request you to please let me know how do I get rid of this problem = now.=20 any help on it is highly appreciated. Thanks, shyam ------=_NextPart_000_0142_01C7971E.A9E61630 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 6.00.6000.16441" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV> Dear sir/madam, I am working on winamp general purpose = pluggin=20 "gen_whatsplaying " project I downloaded the project = "gen_whatsplaying"=20 available on  <A href=3D"http://www.schaffrath.net">www.schaffrath.net</A> = . I am=20 working on it, but getting many errors during compilation and building = the=20 application successfully. I am using MS VC++ 6.0 compiler to compile and = build it. I also downloaded and installed the speech SDK 5.1 from = MS site=20 and Winamp SDK's from Winamp's web site on my PC  to remove the = errors.=20 But still I am getting many compilation and linking errors during = the build,=20 and therefore unable to get the desired .dll file for winamp general = plugins. As suggested by the project developer, and as per microsoft=20 specification, I downloaded and installed the February 2003 version = of the=20 Platform SDK  on my C:\ drive and configured  it to use = with VC++=20 6.0 Now , after making all the changes to configuration setting to = include=20 and lib, in VC++ 6.0 when I am building the project, I didn't see = any=20 changes in the previous errors which I used to get during = compilation before=20 it all remains the same, no changes at all. I think VS 6.0 is not = supporting=20 the "February 2003 version of the Platform SDK at all. Just wanted to know if any one knows = about it in this=20 community to help me out. I really appreciate yours help and kind=20 cooperation with me. I request you to please let me know how do I get = rid of=20 this problem now. any help on it is highly appreciated. Thanks, shyam  </DIV></BODY></HTML> ------=_NextPart_000_0142_01C7971E.A9E61630-- Tag: Re: Can someone explain how these operator is suppose to work Tag: 277054
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 - DsGetDcName not geeting called in retail build DsGetDcName is not getting called in retail build though it's it's working fine in debug build.....wat may be the possible cause for this????????? Tag: Re: Can someone explain how these operator is suppose to work Tag: 277049
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 - p/invoke, __clrcall, Run-Time Check Failure #0 My code uses several pointers to unmanaged functions via dllimport. For some reason, though I didn't change the calling convention, when I declare the pointers, the compiler insists on viewing the dllimported functions as __clrcall (See thread: http://groups.google.com/group/microsoft.public.vc.language/browse_thread/thread/e371441aa1d9603d/a7aec9c7412141a9?lnk=gst&q=__clrcall&rnum=2#a7aec9c7412141a9) I think this is coming back to bite me in a later function call, now. Down along the line -- when calling one of my pointers -- the app freezes when debugging. If I run it without the debugger, I get the following error: "Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention." Running a p/invoked function as __clrcall doesn't make much sense, so that must be the problem. But I didn't choose to do it that way. Even when I explicitly declare the imported functions as __cdecl, when I assign the pointer, VC++ tells me that: error C2440: 'initializing' : cannot convert from 'void (__clrcall *) (mupdf::Data::fz_colorspace *,float *,float *)' to 'void (__cdecl *) (mupdf::Data::fz_colorspace *,float *,float *)' None of the functions with this name in scope match the target type Using a static_cast gives the exact same error. Any help? SigmaX Tag: Re: Can someone explain how these operator is suppose to work Tag: 277042
 - 15
 - Question about compiler bug: Value-initialization in new-expression I recently got into trouble because MSVC++ appeared to incorrectly implement value-initialization, for a struct that I was using. Luckily the bug was reported in 2005 already, by Pavel: Feedback ID 100744, "Value-initialization in new-expression". https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744 The example has a struct that looks very much like mine: struct A { std::string s; int i; }; When doing "new A()", the int data member does not get zero-initialized, as it should. Jonathan Caves (Visual C++ Compiler Team) has admitted that it is indeed a bug. Note that other attempts to value-initialize the struct fail as well: #include <cassert> class B { A m_a; public: B(): m_a() { assert(m_a.i == 0); // Assertion fails! } }; int main() { A a1 = A(); assert(a1.i == 0); // Assertion fails! A a2((A())); assert(a2.i == 0); // Assertion fails! B b; return a1.i + a2.i; } This is a serious bug! Is it going to be solved with the next service packs of VC++ 2003 and VC++ 2005? According to the Feedback page, the status of #100744 is "Closed (Won't Fix)". Does that really mean that this bug won't get fixed at all??? Kind regards, -- Niels Dekker http://www.xs4all.nl/~nd/dekkerware Scientific programmer at LKEB, Leiden University Medical Center Tag: Re: Can someone explain how these operator is suppose to work Tag: 277041
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 - Undefine storage specifier Hi, I was compiling same 3 party software. The DirectX 9.0 SDK file: "<DirectXRoot>\include\dsound.h" uses the type definition "DWORD_PTR". dsound.h does not define or include a header file that define DWORD_PTR. Other typedefs like GUID and DWORD are define. Is there a header file that defines miscellaneous Windows C++ types? Should I add the line: #define DWORD_PTR long* to the dsound.h header file? Thanks, King Tag: Re: Can someone explain how these operator is suppose to work Tag: 277032
 - 17
 - ULONG vs DWORD? Hi, I have this line of code from a Microsoft example printf("Tracks/cylinder = %ld\n", (ULONG) pdg.TracksPerCylinder); in this case pdg.TracksPerCylinder returns a DWORD. My question is "why the ULONG cast", from looking at the docs it would appear ULONG and DWORD are both defined as typedef unsigned long. -- Gerry Hickman (London UK) Tag: Re: Can someone explain how these operator is suppose to work Tag: 277029
 - 18
 - my window cant show menu. what happen for this program? I write a simple program.This program just has a window and a menu. but the result cant find menu. could u help me my program code as following: resource.h //{{NO_DEPENDENCIES}} // Microsoft Visual C++ generated include file. // Used by resource.rc // #define IDR_MENU1 101 #define ID__40001 40001 #define ID__40002 40002 // Next default values for new objects // #ifdef APSTUDIO_INVOKED #ifndef APSTUDIO_READONLY_SYMBOLS #define _APS_NEXT_RESOURCE_VALUE 102 #define _APS_NEXT_COMMAND_VALUE 40003 #define _APS_NEXT_CONTROL_VALUE 1001 #define _APS_NEXT_SYMED_VALUE 101 #endif #endif win.cpp #include <windows.h> #include "resource.h" #include <iostream> using namespace std; HINSTANCE hInst; LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow) { static TCHAR szAppName[]="MyApp"; HWND hWnd; MSG msg; WNDCLASSEX wndclass; wndclass.cbSize=sizeof(wndclass); wndclass.style=CS_HREDRAW|CS_VREDRAW; wndclass.lpfnWndProc=WndProc; wndclass.cbClsExtra=0; wndclass.cbWndExtra=0; wndclass.hInstance=hInstance; wndclass.hIcon=LoadCursor(NULL,IDI_APPLICATION); wndclass.hCursor=LoadCursor(NULL,IDC_ARROW); wndclass.hbrBackground=(HBRUSH)(COLOR_WINDOW+1); wndclass.lpszMenuName="IDR_MENU1"; wndclass.lpszClassName=szAppName; wndclass.hIconSm=LoadIcon(NULL,IDI_APPLICATION); RegisterClassEx(&wndclass); hInst=hInstance; hWnd=CreateWindow(szAppName,"¨ç¦¡¥Ü½d",WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT, NULL,NULL,hInstance,NULL); ShowWindow(hWnd,iCmdShow); UpdateWindow(hWnd); while(GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hWnd,UINT iMsg,WPARAM wParam,LPARAM lParam) { HDC hDC; switch(iMsg) { case WM_CREATE: return 0; case WM_PAINT: { PAINTSTRUCT ps; hDC=BeginPaint(hWnd,&ps); EndPaint(hWnd,&ps); } return 0; case WM_COMMAND: switch(LOWORD(wParam)) { case ID__40001: MessageBox(hWnd,"¨ç¦¡¥Ü½d","IDM_Command",MB_OK); return 0; case ID__40002: DestroyWindow(hWnd); return 0; } break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd,iMsg,wParam,lParam); } Tag: Re: Can someone explain how these operator is suppose to work Tag: 277023
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 - oaidl.h This file is continuously regenerated which prevents my program from being compiled The content is quite large and I wonder if this file is any virus, trojan or spyware? Thanks Tag: Re: Can someone explain how these operator is suppose to work Tag: 277020
 - 20
 - retrieving asynchronous ('immediate') mouse position? hi everybody, i'm building a virtual world (engine), and i use the mouse and WSAD keys to manouver through it. i've tried WndProc(), GetCursorPos, and MOUSEMOVEPOINT to read the mouse position. but they all result in cluttering when i use mouse and keys at once. i've asked something like this in an earlier stadium, but i thought i'd solved it by switching to GetCursorPos. i need an immediate/asynchronous mousePos, independent of the event que, and keyboard activity. anyone? i looked it up in msdn 8, but i couldn't find an easy fix. regards, marco RTYpe 6 Tag: Re: Can someone explain how these operator is suppose to work Tag: 277017
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 - how to forward reference a struct typedef struct _BB; <<<< doesn't work struct something { struct _BB details; }; typedef struct _BB { ... ... } BB; Thanks Jack Tag: Re: Can someone explain how these operator is suppose to work Tag: 277014
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 - SubClassing ? I'm using CListCtrl decleared as CListCtrl m_cList2Ctrl; I have a custom class called CSortListCtrl m_ctrlList; I need to be able to use "m_cList2Ctrl" to control the control. But i also need "m_ctrlList" to have control of the same control so it can use it's custom class (Which is to sort the items in my list control) so when i click the column it can do everyhting it needs, to make the sorting work. I have another custom class for making the column headers multiline. It gets control by this method and does work, but it tried taking the same approach for the SortCtrl and it doesnt work. HeaderCtrl Method for getting control: CHeaderCtrl* pHeader = NULL; pHeader=m_cList2Ctrl.GetHeaderCtrl(); m_HeaderCtrl.SubClassWindow(pHeader->m_hWnd); I tried using this below method to get control of CListCtrl, but it would'nt work: CListCtrl& ctlList = GetListCtrl(); Anyone help would be greatly appreciated. Thanks! Tag: Re: Can someone explain how these operator is suppose to work Tag: 277007
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 - DCOM Problem Dear All, I have written a Web Application which uses VC++ COMs at the backend. I am using DCOM also. When I call DCOM on remote machine from a test asp page, it calls the DCOM successfully, but when I call that DCOM from my application, then it doesnot makes the call to remote machine. The only thing different between both Application Pool is that, DefaultAppPool works on NETWORK SERVICE and my application pool works on LOCAL SYSTEM. Anyone having the idea, what is the problem? When I change it from Local System to Network Service, then DCOM call generates properly but my application stops working. -- Regards, Muhammad Nasir Waqar Tag: Re: Can someone explain how these operator is suppose to work Tag: 277005
 - 24
 - DLL calls within a DLL Is there any reason why I should not be able to make calls to a DLL within another DLL? I guess I could try to obtain the source code for the second DLL and incorporate it, but I'd rather not. Tag: Re: Can someone explain how these operator is suppose to work Tag: 276998
 - 25
 - question about ifstream::read() I am having a heck of a time using the ifstream::read() method. I am using Visual Studio 6.0, and my intelisense indicates that read has an overload of: ifstream::read(unsigned char*, int _n) A lot of the code samples I have googled up show this method being called being called with an unsigned char pointer as well. However whenever I run my code: #define BYTE unsigned char ... int size; BYTE* buffer; ... std::ifstream inputFile("C:\\test.bin", std::ios::in | std::ios::binary); if (inputFile.is_open()) { inputFile.seekg(0, std::ios::end); size = inputFile.tellg(); buffer = new BYTE[size]; inputFile.read(buffer, size); ... I get the error: error C2664: 'read' : cannot convert parameter 1 from 'unsigned char *' to 'char *' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast If I cast buffer as a char* then my results are incorrect. Can someone please tell me what I am doing wrong? -John Tag: Re: Can someone explain how these operator is suppose to work Tag: 276997

On May 23, 12:56 am, Anders Eriksson <andi...@gmail.com> wrote:
> I'm using a 3:rd party library and in one class I have a protected variable
> that I need to get.
>... The class looks like this
> xObject& operator*(){ return *m_pObject;}
> xObject* operator->(){ return m_pObject;}
>...
> If I have an instance of CYObject called myObject how do I get the
> myObject->m_pObject??

The first declaration is saying that if the * operator is used on a
CYObject then return a reference to an xObject.

The second declaration is saying that if the -> operator is used on a
CYObject then to return a pointer to an xObject.

Let's assume xObject has a public int called nValue.

For the first operator (*) you can use
xObject & myxObject = *myCYObject;
int myValue1 = myxObject.nValue;

and for the second operator (->) it's
int myValue2 = myCYObject->nValue;

> English is not my first, or second, language
> so anything strange, or insulting, is due to
> the translation.
> Please correct me so I may improve my English!

Your English is good.

Marc

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