accessing the environment variables.

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  - 1
    - stuck with what looks like a compiler bug in VS.NET 2003 vs VS.NET 2002 This is going to be a little vague I'm afraid as it's hard for me to provide explicit details without a vast quantity of extra information. I've recently changed compiler from .NET 2002 to .NET 2003. I have a fairly complicated application, which is an ISAPI extension that relies on several other rather large projects (Xalan, Xerces, ICU, boost). At some point, i'm at the bottom of a pretty deep call stack, and I throw an exception which travels up a lot of it. It seems that in one particular module, a couple of the functions don't manage to unwind the call stack properly -- it always crashes in either of these two functions during the unwind sequence. It's 100% reproducible with .NET 2003 and 100% not reproducible with .NET 2002, and depending on how I've been tinkering with the code, always crashes in the same place. I've tried sprinkling some extra try () { } catch (...) { throw; } blocks around various parts of these functions. The result is that I can make the problem go away, presumably by generating different unwind code. Oh, and this only happens with a release build. Normally I'd claim responsibility for mashing memory rather than pointing at the compiler, but in the case, the application (and those things that it relies on) have been proved to be very stable. I can also make this happen with a wide variety of initial conditions (effectively doing things that would drastically change the pattern of memory allocations up to that point), pageheap /full doesn't spot anything, and if I _don't_ throw the exception, then things all work as expected, even to the point of being able to conduct stress tests that previously passed. I realise that this is a bit of a long shot, but if anyone could offer any advice on what to try or look for to be certain as to what is going on that would be great. The application is open source, so if anyone has a great deal of spare time then it should be possible to recreate it locally. I'm out of ideas other than reading the compiler generated assembly at the moment (which isn't an easy task as my asm is a bit rusty these days). If it comes to it, I guess I'll have to drop back a compiler version, which would be a pity. Thanks, Mark Tag: accessing the environment variables. Tag: 228791
  - 2
    - is STL in msvc 6.0 (sp5) thread safe Hi there! We have app server written in C++ (stl is used a lot). And we use Visual C++ 6.0 compliler to built it. App is not stable when it is heavy loaded. It eather crashes or some static data in it becomes corrupted (so server stops doing his duties). We put some stuff from server into a test and with a lot of threads doing subset of usual servers work. And test crashes within minute or so. 40 threads are intensively doing allocation, populating and freeing containers such as std::map and std::set. Threads write only to their own (private) containers and there are some shared containers that are only read (via find method). So the question is: are stl containers such as std::map and std::set in VC6.0 thread safe in mentioned manner? And if they ar not - where to find the fix? --- With best wishes, Kirill. * ...chasing dreams... Tag: accessing the environment variables. Tag: 228788
  - 3
    - #pragma once Hi, Just out of curiosity, is using #pragma once equivalent to using #ifndef HEADER_H #define HEADER_H ... #endif ? Thanks, Nelson Tag: accessing the environment variables. Tag: 228784
  - 4
    - loading bitmaps from files Hello all, I'm writing a programme which needs to load bitmap files (*.bmp) from disk and then access the raw pixel data. I'd like an easy way to get that raw data as one plane, 32 bits per pixel. Right now I'm using LoadImage() to get the file and then two calls to GetDIBits(). The first call is to get the BITMAPINFO structure data so I know how big a buffer to allocate for the pixel data, and the second call actually gets the raw data. hbmp = (HBITMAP)::LoadImage(NULL, lpszFile, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); memset(&bmi, 0, sizeof(BITMAPINFO)); bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader); rc = ::GetDIBits(::GetDC(NULL), hbmp, 0, 0, NULL, &bmi, DIB_RGB_COLORS); m_pclrBits = (COLORREF *)calloc(bmi.bmiHeader.biWidth * bmi.bmiHeader.biHeight, sizeof(COLORREF)); rc = ::GetDIBits(::GetDC(NULL), hbmp, 0, bmi.bmiHeader.biHeight, m_pclrBits, &bmi, DIB_RGB_COLORS); Currently my programme just assumes that the raw pixel data will always be 32bpp with only one plane, but I just don't know if that is the case. ::GetDC(NULL) returns the root (desktop) window, which on my computer is 32bpp, but it might not be on a different machine and for all I know GetDIBits() might "translate" the raw data into however many bits/pixel and planes the root window is using. Would I be better off using ::GetBitmapBits even though the MSDN library says that is an obsolute function? Is there a way to ensure that the raw data is _always_ 32bpp and in a single plane? I'd rather not have to write code to take number of colour planes, bits per pixel and the colour table and translate "by hand" the raw data into 32bpp. Too many variations/combinations, too much wasting time. :-P I'd prefer to write all the code myself, rather than downloading some third-part toolkit which woud probably have more function than I need. Thanks in advance. P.s. Is there no function to write bitmap data to a *.bmp file? I found the basic structure of a *.bmp file in the MSDN library help files, so if I had to I could hack up a *.bmp file writer, but I'd rather not. Is there a SaveImage() companion to LoadImage() that I could just pass an HBITMAP handle to? -- Cory Albrecht http://cory.doesntexist.com/ "Star Trekkin' across the universe! Always going forward 'cause we can't find reverse!" Tag: accessing the environment variables. Tag: 228777
  - 5
    - unresolved external symbol __endthreadex and unresolved external symbol __beginthreadex I just don't get it. I punch in the code JUST as it is written and it = doesn't work: //*************************** // // Hello.h // //*************************** class CMyApp : public CWinApp { public: virtual BOOL InitInstance(); }; class CMainWindow : public CFrameWnd { public: CMainWindow(); protected: afx_msg void OnPaint(); DECLARE_MESSAGE_MAP() }; //************************** // // hello.cpp // //************************** #include <afxwin.h> #include "hello.h" CMyApp myApp; //////////////////////////// // CMyApp member functions BOOL CMyApp::InitInstance() { m_pMainWnd =3D new CMainWindow; m_pMainWnd->ShowWindow(m_nCmdShow); m_pMainWnd->UpdateWindow(); return TRUE; } //////////////////////////// // CMainWindow message map and member functions BEGIN_MESSAGE_MAP(CMainWindow, CFrameWnd) ON_WM_PAINT() END_MESSAGE_MAP() CMainWindow::CMainWindow() { Create(NULL, "The Hello Application"); } void CMainWindow::OnPaint() { CPaintDC dc(this); CRect rect; GetClientRect(&rect); dc.DrawText("Hello, MFC", -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); } --------------------Configuration: hello95 - Win32 = Debug-------------------- Compiling... hello.cpp Linking... nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol = __endthreadex nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol = __beginthreadex Debug/hello95.exe : fatal error LNK1120: 2 unresolved externals Error executing link.exe. The project was a Win32 Application. What have I done wrong? There is = no indication that anything else is necessary but to me it looks like = there are some includes not included or some libs not libed that should = be included and\or libed. --=20 George Hester __________________________________ Tag: accessing the environment variables. Tag: 228775
  - 6
    - VC SDK I'm using VC 6 with latest Service pack (6). > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/getting_the_system_version.asp I have been working with the above sample to display which OS the program is running on. Prior to updating the SDK and SP the code above worked flawlessly, Since updating, I get errors like > c:\working\ostest\hello\hello.cpp(59) : error C2039: 'wProductType' : is not a member of '_OSVERSIONINFOEXA' > c:\working\ostest\hello\hello.cpp(63) : error C2039: 'wSuiteMask' : is not a member of '_OSVERSIONINFOEXA' > c:\working\ostest\hello\hello.cpp(63) : error C2065: 'VER_SUITE_PERSONAL' : undeclared identifier According to MSDN these items are declared in Winbase.h. My include file for Winbase.h does not have these declarations. Has there been a change to this include file that your online sample does not address? I have even uninstalled everything and reinstalled, applying the Service Pack and Updating the SDK's. Is there an update that I missed? -- Regards, Steve Topilnycky Top Cat Computing http://www.topcatcomputing.com/ Tag: accessing the environment variables. Tag: 228769
  - 7
    - Writing a C++ program to send an email Does anyone know of any API or COM object that allows you to send and email from a C++ program Tag: accessing the environment variables. Tag: 228768
  - 8
    - max speed compilation failed I have a simpe win32 dll. when I make an optimization/max speed compilation, it always says: Compiling... Command line error D2016 : '/ZI' and '/O2' command-line options are incompatible if I use other options in optimization, it can compile. I wonder if I remove /ZI /O2, is it still in max speed ? or how can I get a max speed compilation ? thanks. /* Call Library source file */ #include "extcode.h" #include <ole2.h> #include <stdio.h> #include <conio.h> #include <winbase.h> void GetSeeThrough(unsigned char *aLine,int *seeThrough,int aLMax,int aLMin) { register i,j,k; for( j=0;j<256;j++) { //-----------added--below--------- if(j<=aLMin) { seeThrough[j]=150;//srcImage->Width; } else if(j>=aLMax) { seeThrough[j]=0; } else { k=0; for(i=0;i<150;i++)//srcImage->Width { if(j<=aLine[i])k++; } seeThrough[j]=k; } } } _declspec(dllexport) void Go(long count, long *time); _declspec(dllexport) void Go(long count, long *time) { int seeThrough[256]; unsigned char aLine[150]; int i; int tt1,tt2,tt3; *time=count*4; tt1=GetTickCount(); for(i=0;i<150;i++) { aLine[i]=i; } for(i=0;i<count;i++) { GetSeeThrough(aLine,seeThrough,255,0); } tt2=GetTickCount(); tt3=tt2-tt1; //milliseconds *time=tt3; } Tag: accessing the environment variables. Tag: 228760
  - 9
    - Sharing data between apps Greetings, I know this has come up before, but I never needed to know the details. Well now I do. How do it use the CreateFile() API to create a memory-only data block that I can use to share data between two or more applications? If someone could point me to a good reference that would be great. Thanks Murrgon Tag: accessing the environment variables. Tag: 228759
  - 10
    - typedef struct question i asked this before and forgot the answer: i am doing this: typedef struct { }MYSTRUCT and inside the struct i want to declare a pointer to a MYSTRUCT .... but the compiler doesn't like it, what do i need to do before hand again? thanks Tag: accessing the environment variables. Tag: 228758
  - 11
    - CopyFile() very slow What is the best method (read fastest) of copying a file I'm using CopyFile() but it is extremely slow. Below i a small console app that illustrates this. Just replac the hardcoded file paths with the path to a file ~10MB Compile and run the program and see the reported times Then go to Windows Explorer and copy the same file My results were about 7 secs using CopyFile() an instantaneous through Explorer #include <windows.h #include <stdio.h #include <string.h #include <time.h #include <conio.h int main(int argc, char* argv[] char ampm[] = "AM" time_t ltime struct tm *today time( &ltime ) today = localtime( &ltime ) if( today->tm_hour > 12 strcpy( ampm, "PM" ) today->tm_hour -= 12 if( today->tm_hour == 0 ) /* Adjust if midnight hour. * today->tm_hour = 12 printf( "Begin time:\t\t\t\t%.8s %s\n" asctime( today ) + 11, ampm ) CopyFile("c:\\temp\\big_file.zip", "c:\\temp\\big_file2.zip", 0) time( &ltime ) today = localtime( &ltime ) printf( "End time:\t\t\t\t%.8s %s\n" asctime( today ) + 11, ampm ) int ch printf("\n\tPress any key to exit...\n") ch = getch() return 0 Thanks Drew Tag: accessing the environment variables. Tag: 228755
  - 12
    - Determining System Boot/Login Time Is there a reasonably simple way to determine the date and time at which the system booted and/or when the current user logged in? Tag: accessing the environment variables. Tag: 228749
  - 13
    - Extracting data from a VARIANT in C/C++ I am writing an add-in for an application. The add-in is a DLL written in C++. The parent application passes various parameters to a function in the DLL. On of these function parameters is type "_variant_t". I need to extract the string value from this _variant_t. I'm an old C programmer from way back, but I'm not much of a C++ programmer, so I am, as yet, unable to deduce the means fo doing this from the header files. Is there an MFC or Win32 library or class that provides the means of extracting specific data types from a _variant_t? Thanks in advance for any help. Steve Tag: accessing the environment variables. Tag: 228742
  - 14
    - WS_SYSMENU without CLOSE BOX Hi there, I'm trying to create a new window which only has a Minimize Box and Maximize Box. I need to put WS_SYSMENU to show the Min and Max box, but the Close Box also shows up. Is there any way to create a window with just a min and max box without CLOSE box? Thanks, Robert Tag: accessing the environment variables. Tag: 228741
  - 15
    - New[] and delete Hi, A Quick Question please .... If I use new[1] can I use delete, instead of delete[] ? I mean when I use, " Type_AddrObj lpAddress = new Type_AddrObj [1] ;" Then which is correct ? a) delete[] lpAddress ; b) delete lpAddress ; Since the size of array is always specified as 1. Thanks. Vipul Pathak ; Tag: accessing the environment variables. Tag: 228735
  - 16
    - Disabled CTreeControl question Hello! If I select an item in a tree - and disable the whole tree - all the items in that tree is "grayed". How can I avoid that? This is how I would like things to work - only one item should be grayed - and I should not be able to click on this tree. -- - Lars Tag: accessing the environment variables. Tag: 228733
  - 17
    - Compilation error with std list class Hi All, When I try to include the header for a class that has a member list<int> m_list; I get over 100 errors of the nature: "c:\program files\microsoft visual studio\vc98\include\functional(16) : error C2143: syntax error : missing '{' before '<'" Here is the complete header which I have cut down to the minimum in order to show the error: #include <list> using namespace std; class CMyContainer { public: CMyContainer(); int GetSize(); private: list<int> m_list; }; Any ideas what is wrong? Cheers, Rob Tag: accessing the environment variables. Tag: 228721
  - 18
    - How to send Email in VC Applications? hi, What is the best way to send Email in VC applications? Thanks, Behzad Tag: accessing the environment variables. Tag: 228718
  - 19
    - Is it possible? How to in VS 6 implement a library of a class so that the class can be used in an application like, main() { ClassFromLibrary o; o.method(); ... } Thanks! Tag: accessing the environment variables. Tag: 228717
  - 20
    - Windows NT Screensaver Hi I've been tasked to create a screensaver that blanks the screen, and displays a customn dialog box when the use,r for want of a better word wiggles the mouse or uses the keyboard. However I'm not sure how to display the dialog box, if anyone could help it would be great. For reference I'm using vc++ 5.0 on Windows NT Thank Dave Tag: accessing the environment variables. Tag: 228716
  - 21
    - Unknown bitmap format Hi, I want to update the toolbar, but it pops up "Unknown bitmap format",and I can't change it at all. How should I do? Thanks in advance. Cui Sheng Tag: accessing the environment variables. Tag: 228705
  - 22
    - Error With Structures I have the following code in VC6: typedef struct SS1 { int a; int b; int c; } Struct1; void Test() { const NUM_STRUCTS=1; Struct1 *pS; Struct1 *pA; int ndx=0; pA=(Struct1*)malloc(NUM_STRUCTS*sizeof(Struct1)); for(ndx=0;ndx<NUM_STRUCTS;ndx++) { pS=pA+(ndx*sizeof(Struct1)); pS->a=101; pS->b=202; pS->c=303; } // end for for(ndx=0;ndx<NUM_STRUCTS;ndx++) { pS=pA+(ndx*sizeof(Struct1)); cout<<"\n*"<<pS->a; cout<<"\n*"<<pS->b; cout<<"\n*"<<pS->c; } // end for free(pA); } // The code works fine if NUM_STRUCTS is 1, but causes an assert error if NUM_STRUCTS is greater than one. I'm sure it is something simple, but I can't figure it out. Thanks in advance. -- Chip Pearson Tag: accessing the environment variables. Tag: 228701
  - 23
    - Is the rand() known to be buggy? It repeat same value after 349 iterations! I am issuing the srand(1) statement before every time I use rand() in a for(;;) loop sequence. Consistently, the value 4313, that showed up in iteration 340, repeat itself in the 349th iteration ! If it would be a true random generator, and given that it is defined as returning type int, it would use one of the (primitive) generating polynomials of the 15th rank, such that it would guarantee not to repeat even once before exhausting all values between 1 and 32767, while 0 is not in the game (different seeds should only impact the order in which these 32767 numbers are generated (and possibly starting with different values)). Anybody have a handy true random generator source code? Thanks Tag: accessing the environment variables. Tag: 228698
  - 24
    - URLOpenBlockingStream can't get new data from url until closing application aloha i am using the function URLOpenBlockingStream(...) to get some data from a url and then parsing the data. the problem is that after retrieving the data for the first time, the next time i am trying to pull the data again the data is the same old data from each url and i cant get a new data from the url until i am opening the browser and refresh it or closing and opening the application my code is CString getCurrentVal(CString tasUrl) { ::CoInitialize(0); CComPtr<IStream> pStream ; HRESULT hr = ::URLOpenBlockingStream ( NULL,_T(tasUrl),&pStream,0,NULL ); if (SUCCEEDED(hr) && pStream) { CString html; while(SUCCEEDED(pStream->Read(buffer, size, &bRead)) && bRead > 0){ html += CString(buffer, bRead); ... } ::CoUninitialize( ); } is anyone have any clew ? Tag: accessing the environment variables. Tag: 228697
  - 25
    - interrupt handling ... I'm looking for a simple example of how to implement and interrupt handler and a call to a function in my code. I'm using Winme and VStudio 6 ... I guess it problably different for other OS (as usually with Windoze) it's not portable ... Thanks in advance :-) Tag: accessing the environment variables. Tag: 228696
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  - 1
    - Iterating through an enum??? Is there anyway to iterate through an enumeration?? FOr example for an enum defined below typedef enum TST1 = 1 TST2 = 10 END_TST = 100 } TST_TYPE If there anyway to do something lik for ( TST_TYPES i; i != END_ST; i++ TST_TYPE tst = TST_TYPES[i] or something similiar? I basically have an enum that I need to build another list from. Thanks -C Tag: accessing the environment variables. Tag: 228692
  - 2
    - Dealing with folder name with spaces inside Hi, there When encountering folder name with spaces inside, such as C:\Documents and Settings, my system() program will return error. I am using CString strT.Format(_T("%s %s %s"), pszCmd, pszInput, pszOutput), then using system(strT) do the job. I thought it could be solved by adding "" arround those directories. Then I used strT.Format(_T("\"%s\" \"%s\" \"%s\""), pszCmd, pszInput, pszOutput) But it still failed. When I using those strings in Command Prompt, such as "pszCmd" "pszInput" "pszOutput", they works well. So what is the problem, and how to solve it Thanks lot Gary Tag: accessing the environment variables. Tag: 228687
  - 3
    - Debug DLL files will only work on one computer Hi, Can anyone tell me why my Debug DLL files will only work on one computer? It seems like i can get it to work on another computer immediately after a recompile, but if i commit it to my CVS server for a while, and someone else downloads the DLL file on another computer, they are unable to use the DLL files. Is there some setting i am missing? Thanks! Tag: accessing the environment variables. Tag: 228680
  - 4
    - Problem with Local time to System time conversion Hi, Any help would be much appreciated, and here's my problem: I've used the function SystemTimeToTzSpecificLocalTime() to convert a UTC based time to a local time and everything works fine. However,when I try to do the reverse, that is, from a local time back to a UTC time. The function TzSpecificLocalTimeToSystemTime(); is not supported under windows 2000 (only supported on XP/server2003) So I tried the function FileTimeToLocalFileTime() as a work-around but my time is always off by one hour because of daylight saving. Are there any easier alternatives besides making my own timezone conversion routines? Or does it mean that I'll have to implement my own version of TzSpecificLocalTimeToSytemTime() ? Thanks in advance! Tag: accessing the environment variables. Tag: 228679
  - 5
    - NT User Password Authentification Hi I'm developing an app and part of what I want it to do is check that a users password is valid, however I'm a bit new to this asspect so would be grateful if anyone could point me in the direction of win32 api call that can be used to check a users password, or if this doesn't any web resource that covers this topic Thank Rob Tag: accessing the environment variables. Tag: 228673
  - 6
    - forced to old C Hi all, I am currently using a working sample of an app that I intend to use as my foundation for something else. When I compile this sample I obtain a clean compile. However, when I intend to integrate with code that supposedly should be supported (as to define a variable anywhere in a function), it does not let me it forces me to declare the variable at the beginning of the function. I've tried to look at the project settings to see what is that is configured, but I do not see anything that forces this app to use traditional C syntax (i.e. I checked the compiler switches). Can anybody there suggest what can be happening? Thanks, Carlos. Tag: accessing the environment variables. Tag: 228670
  - 7
    - install modem from code Please give any direction how can I install modem with INF files from code VC++? I tried ShellExecute .... "rundll32.exe", "setupapi.dll,InstallHinfSection DefaultInstall 132 " + sFullPath INI file And I have no result. regards, Sly Tag: accessing the environment variables. Tag: 228663
  - 8
    - convert character Hi, I hope the question is not too off-topic... Is there any function in VC7.1 or any SDK which... 1) ...converts a 8-bit char to the corresponding 16-bit unicode value, using some given codepage? 2) ...does the reverse when possible? for example, if I run charmap.exe I see "Euro sign", U+20AC (0x80) which is exactly what I need. -- The set of solutions is never empty. Two solutions together form a new problem. -- Mycroft Holmes Tag: accessing the environment variables. Tag: 228660
  - 9
    - VC7.1 - put debug info in .exe not .pdb In VC6, when building an debug .exe, the linker switch /pdb:none (combined with /debug and the /Z7 compile switch) put all the debug info into the .exe itself and no .pdb file was created I believe I may have read somewhere that this is no longer possible in VC7.1 i.e. when building a debug exe I am forced to have the debug info in a .pdb file. I have certainly been unable to manage it so far, I always end up with my debug info in a .pdb file despite trying many different compiler/linker switch combinations. Is it true that VC7.1 no longer supports this ? If not, what are the magic words in order get the debug info into the exe and not create a .pdb file Thank Andy Tag: accessing the environment variables. Tag: 228658
  - 10
    - what's the meaning of "car","cdr","cons" in tree's algorithm? Hi! I find a section of source code about binary tree's algorithm£¬I find the struct: typedef struct _BIN { void *car; /* address of <car> */ void *cdr; /* address of <cdr> */ } BIN; typedef struct _CELL { int tag; /* tag of <cell> */ /* 0: cons */ /* 1: atom */ union { BIN cons; U_CHAR *atom; } value; } CELL; there is "/* address of <car> */" & "/* address of <cdr> */" , but I don't know what's the meanning of "car" , "cdr" & "cons"? Thanks in advance! Tag: accessing the environment variables. Tag: 228654
  - 11
    - GlobalFree throws exception after CPrintDialog::DoModal() Hi! I'm initializing a CPrintDialog to display a previously selected printer. For this I allocate memory on the heap with GlobalAllo for the CPrintDialog::m_pd.hDevNames (and m_pd.hDevMode (same problem)). To the best of my knowlege I should use GlobalFree to clean up but after the call to CPrintDialog::DoModal() the memory i create with GlobalAlloc seems to get displaced or is deallocated. In debug mode a user breakpoint is called and I get a message saying: Invalid Address specified to RtlFreeHeap For now I have commented out calls to GlobalFree to make it work but i suppose this gives me a memory leak. Can anyone help out? / thanks in advance Anders Here's the code: // allocate a new DEVNAMES object on global heap int nSize = sizeDevNames + sizeName + sizeSpool + sizePort; HANDLE local_hDevNames = ::GlobalAlloc(GPTR, nSize) ; // allocate on heap LPDEVNAMES lpDevNames = (LPDEVNAMES)::GlobalLock(local_hDevNames); // lock it memset(lpDevNames, 0, nSize) ; // init to 0 // add the 3 strings to the end of the structure ... ::GlobalUnlock(local_hDevNames) ; // unlock CPrintDialog nDlg(true); nDlg.m_pd.hDevNames= lpDevNames; if(nDlg.DoModal() == IDOK) { ... } ::GlobalFree(local_hDevMode); // here's the error Tag: accessing the environment variables. Tag: 228653
  - 12
    - Why can't display the title of a Dialog? With the dialog's property,I have checked its Style to TitleBar,Minimize box,and its caption have some characters put into. But when I run the application,I cannot find the title of the Dialog . Why and how? Thanks. Tag: accessing the environment variables. Tag: 228651
  - 13
    - Is there a way to recall a constructor function of an already existing class object? Given the following class A and object instantiation Ai: class A { int d; public: A(int a=0) {d=a;}; }; A Ai; In order to reset Ai's data members, I thought simply to issue the following statement: Ai.A(); like calling any other public function member of A. But the compiler doesn't like it. Any elegant solution to accomplish it? In reality, my A's data members are many and its quite complicated, that is why I would like to reuse the constructor. Thanks Tag: accessing the environment variables. Tag: 228640
  - 14
    - Gethostbyaddr() problem... Hi I get 11004 error code in my program calling gethostbyaddr() The simple code is as follows ----------------------------------- struct hostent *hp .. unsigned int addr; addr = inet_addr(server_name) hp = gethostbyaddr((char *)&addr, 4, AF_INET) .. throw Exception( CWsaerr(), WSAGetLastError(), ...) ------------------------------------------------------ 'server_name' is passed in as Ipv4 format, i.e. xxx.xxx.xxx.xxx (eg. 123.45.65.23 The error code has description of " Valid name, no data record of requested type." Both the client and server systems are in the same network .. What is the problem here Thanks Pete Tag: accessing the environment variables. Tag: 228639
  - 15
    - C++ ray tracing for windows Does anyone know of a c++ class library for ray tracing on winxp regards, Kurt Tag: accessing the environment variables. Tag: 228638
  - 16
    - cursors in a dll Is there a way to put a cursor resources in a dll and load them from either within the dll or from the application that loads the dll? I am using GetProcAddress to access functions within the dll. Dave Tag: accessing the environment variables. Tag: 228633
  - 17
    - Obtain PID's I would like to know how to obtain a processe's owner from its pid The sequence of OpenProcess OpenProcessToken GetTokenInformation LookupAccountSid does not work on system processes. This has been documented in MSDN as being casued by lack of SE_DEBUG_NAME privelege. The KB article Q131065 describes how to enable this privelege in our process so that OpenProcess does not fail on system processes The said method works on all processes except system(pid 8) process and CRSS process. 1)Why does this not work on these processes ? 2)Are there any other rights that have to be assigned to get this to work ? 3)Is there any other method that doesnt require these rights to obtain the process owner name ? Iam targeting NT 4.0 sp6 and above (2000 XP etc) Tag: accessing the environment variables. Tag: 228617
  - 18
    - BUG? Access violation with ::swscanf, or it's just monday morning I am using sscanf to scan a number, and as a guard I scan a character afterwards and then check that the result of sscanf is 1 (i.e. that there is no character after the decimal number). My format specifier is thus "%ld%c". Using the wide version, access violation. This is with VC6, not sure the SP level. Here an entire program (except headers) that repeats the problem: int main(int, char*) { long num; char ch; wchar_t wch; wchar_t buf[] = "1p"; ::sscanf("1p", "%ld%c", &num, &ch); // Works, num=1, ch=112 ('p') ::swscanf(buf, L"%ld%c", &l, &w_ch); // Works, num=1, w_ch=112 ('p') ::swscanf(L"1p", L"%ld%c", &num, &w_ch); // Access violation return 0; } The stack trace is: ungetwc(L'p', _iobuf *0x0012feec) line 184 + 33 bytes _un_inc(L'p', _iobuf *0x0012feec) line 1068 + 14 bytes _winput(_iobuf *0x0012feec, const unsigned short *0x00428040, char*0x0012ff20) line 719 + 26 bytes swscanf(const unsigned short * 0x00428074 `string', const unsigned short * 0x0042803c `string') line 74 + 17 bytes main([omitted]) in main, &l = 0x0012ff7c here, and &w_ch = 0x0012ff74. Memory 0x00428074 = "1.p.k.j."... 0x0012feec = 0x76 0x80 0x42 0x00 (i.e. 0x00428076 which is pointer to the "p" in the format string) 0x00428040 = "d.%.c.\0." 0x0012ff20 = 0x74 0xFF 0x12 0x00 (i.e. 0x0012ff74, &w_ch). The instruction giving the AV is: mov word ptr[edx], cx where ECX=0x00000031 ('1') and EDX=0x00428074, i.e. the address of the start of the buffer. ungetwc is attempting to write to the buffer, which is presumably in read-only memory as it is a string literal. So I conclude that swscanf, via ungetwc, is not respecting the constness of the 'buffer' input parameter. This causes an AV if the buffer is in fact in read-only memory. In real applications, the buffers are unlikely to be in read-only memory, but this bug does indicate that it is not threadsafe to use swscanf if the buffer is shared between threads. No similar behavior is exhibited by the narrow version, sscanf. I do not need suggestions for workarounds. Tag: accessing the environment variables. Tag: 228613
  - 19
    - Arguments to winmain Hi There!. I am a newcommer in MFC programming. How does one parse parameters passed as command line arguments in the Win32 environment? I know i can use lpCmdLine, but how do i do that? Can someone show me an example. By the way I am useing Embedded Visual c++ Tag: accessing the environment variables. Tag: 228610
  - 20
    - "Yes to all" button in messagebox Hello. Is it possible display "yes to all" button in my messagebox with VC++ 6? What is the flag that I need? In msdn I don't see anything about it. What is the returning value in that case? Thanks Jordi Tag: accessing the environment variables. Tag: 228599
  - 21
    - ShellExecute Link error error I encountered a link error when compiling a code which contains ShellExecute error LNK2001: unresolved external symbol __imp__ShellExecuteA@2 Do I need to include special library ============================================= This is the code: HSWShellExec.c #include <windows.h #include <shellapi.h #include "ShellExec.h int result /************************************************************************* JNIEXPORT jint JNICALL Java_ShellExec_execute(JNIEnv *e, jobject o, jstring command /************************************************************************* const jbyte *cmd = (*e)->GetStringUTFChars( e, command, NULL ) HINSTANCE inst = ShellExecute( 0, "open", (const char *)cmd, NULL, NULL, SW_SHOW ) (*e)->ReleaseStringUTFChars( e, command, cmd ) return( (UINT)inst > 32 ) ============================ This is the command cl -Ic:\j2sdk1.4.1_02\include -Ic:\j2sdk1.4.1_02\include\win32 -LD HSWShellExec.c -FeHSWShellExec.dl ========================= This is the setting set LIB=C:\Program Files\Microsoft SDK\Lib;C:\Program Files\Microsoft Visual Studio\VC98\lib;C:\Program Files\Microsoft Visual Studio\VC98\mfc\lib;C:\Program Files\Microsoft Visual Studio\VC98 set INCLUDE=C:\Program Files\Microsoft Visual Studio\VC98\Include;c:\j2sdk1.4.1_02\include;c:\j2sdk1.4.1_02\include\win32 ===================================== This is the Link error HSWShellExec.ob Creating library HSWShellExec.lib and object HSWShellExec.ex HSWShellExec.obj : error LNK2001: unresolved external symbol __imp__ShellExecuteA@2 HSWShellExec.dll : fatal error LNK1120: 1 unresolved external Tag: accessing the environment variables. Tag: 228598
  - 22
    - the behavior of vc7.1 exception Hi, experts. i write a simple program to test EH in visual c++ 7.1: void throwfunction() { throw "test"; } class A { int i; public: A(int I):i(I){ cout<<"---------------------------A:"<< i <<"-----------------------\n"; } ~A() { cout<<"--------------------------~A:"<< i <<"-----------------------\n"; } }; int main(int ,char*) { A b(1); throwfunction(); cout << "---after throw--------------\n"; return 0; } According to TC++ 3rd(14.4.2),"resource acquisition is initialization". I think the result should be : -------------A:1--------------------- ------------~A:1--------------------- But the runtime result is strange! if it is debug version exe, when u run this program,will popup a dialog and there are 3 choices: 1. abort: if u select this one, the result is: -------------A:1--------------------- 2. retry : if u select this one, the result is: -------------A:1--------------------- ------------~A:1--------------------- it is a expected result. 3. ignore:if u select this one, the result is: -------------A:1--------------------- This application has requested the function to terminate it in an unusual way. please..... if it is a release version the result is similar with 3 above. what is reason? and how can I get the expected result ? In addition, i add try..catch.. in the main: int main(int ,char*) { try { A b(1); throwfunction(); cout << "---after throw--------------\n"; } catch(...) { throw; } return 0; } the result is: -------------A:1--------------------- ------------~A:1--------------------- it is the expected result, but why? Tag: accessing the environment variables. Tag: 228596
  - 23
    - virtual function and list class Base { public: virtual void virt(); ... }; class Derive1 : public Base; class Derive2 : public Base; main() { list<Base*> list1; Derived1 d1; Derived2 d2; list1.push_back(&d1); list1.push_back(&d2); list1.begin()->virt(); ... list<Base&> list1; Derived1 d1; Derived2 d2; list1.push_back(d1); list1.push_back(d2); list1.end().virt(); } Is there anything wrong with the code? Will list1.begin()->virt(); execute the virt() in Derived1? Will list1.end()->virt(); execute the virt() in Derived2? Thanks for your help! Tag: accessing the environment variables. Tag: 228594
  - 24
    - CALLBACK FUNCTION of timeSetEvent() The CALLBACK FUNCTION of timeSetEvent() is implemented by WINMM creating a time critical priority thread on behalf of its client and executing in its client's context. Does this mean that the variables shared between the CALLBACK FUNCTION and its client thread should be synchronized? How to make all the execution of statements in the CALLBACK FUNCTION atomic? In other words, how to avoid that CALLBACK FUNCTION changes some variables but all, and then is interrupted by its client gets running with "half-changed" variables? Is it possible that CALLBACK FUNCTION can be preempted at all? Thanks for your help! Tag: accessing the environment variables. Tag: 228592
  - 25
    - Memory size limit for DDE APIs( like GlobalAddAtom() ) This question is about Windows API call, not vc. Sorry I don't know which group to post it I got a strange result when use DDE to transfer data to Excel. What I'm doing is to read a file, and pu data into Excel through DDE. The program will crash at different cell on different PCs (NT, XP, 2000). E.g. on a NT, if I plan to transfer records that has 90 columns each, then my program crashed at record 18 (Excel stopped at R184C50). If I cut the column number by half (i.e., each record now has 45 columns), the Excel stopped at R372_C8. This looks like that a global memory with limited size is somehow messed up (184X90 almost = 372X45 ) We are using the DDE API calls directly. We use GlobalFindAtom() to check if an item is there; if not call ClobalAddAtom() to add it. Trace shows that when we call GlobalFindAtom() to find item "R184C51" the function returns a value saying this item is there when it's definitely not. When we call GlobalGetAtomName( to retrieve this atom, sure it's not there (sometimes we do get some strings back, but the string looks lik it's from a wrong memory address, something like "B_comple" ). To work around it, we tried to delete such an Atom (in a WHILE loop), but it can't be done and the program went into a dead loop. We the tried to change the form of the item from "R184C51" to "R184C051", "R0184C051",..., etc, and add the new item; but this won't work either (sometimes works, some times not). So, the system memory is totall messed up (each time we have to reboot to do another testing). BTW, the returned atom is always in the correct range ( > 0xC000). Also, sometimes when we call GlobalFindAtom() to find say, R250C9, it ma give us an atom value of say, R16C33, and of cource Excel cell R16C33 is wrongly updated If the array of records is smaller than the crash threshod (e.g, less than 184 records when we're tryin the 184X90 data), there's no problem at all. All the values can be correctly transfered to Excel. So, the question is, is there a limit for the number of atoms that can be added into the global atom table by calling GlobalAddAtom() ? Note that the call didn't give us any error indication, and as I said, our proble begins when GlobalFindAtom() says it find a atom, when such an atom is not there at all Thanks for help Tag: accessing the environment variables. Tag: 226591

How to access the environment variables in VC++ 6.0 console application ? Can anybody of you please give me an example
for the same ?

--Bansidhar

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Re: accessing the environment variables. by Les

Les
Thu Apr 22 08:37:52 CDT 2004

"Bansidhar" <anonymous@discussions.microsoft.com> wrote in message
news:8741C535-1900-4C34-A2B6-FACAD91A2169@microsoft.com...
> How to access the environment variables in VC++ 6.0 console application ?
Can anybody of you please give me an example
> for the same ?

If you have the MSDN documentation see the "getenv" / "_wgetenv" function.
It returns a char*

/* Get the value of the LIB environment variable. */
char *libvar;
libvar = getenv( "LIB" );

hth
Les

>
> --Bansidhar

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Re: accessing the environment variables. by Mark

Mark
Thu Apr 22 08:43:28 CDT 2004

> How to access the environment variables in VC++ 6.0 console application ?
Can anybody of you please give me an example
> for the same ?
>
Look up "getenv" in MSDN, sample code is included in the help.

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