ifstream in mfc cause strange errors in debug only [modified]

[Maxwell Chen]

The order of #include's may matter. Which do you include first? "stdafx.h" or <fstream> ?

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Maxwell Chen

[FredrickNorge]

stdafx.h is before fstream

[toxcct]

i don't think it is the matter here, otherwise he would have got a "precompiled header"-like error

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TOXCCT >>> GEII power

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[Cedric Moonen]

As the problem is only in debug mode, maybe there is something wrong with some preprocessor definition. If you have a #ifdef _DEBUG statement at the top of your file, post it here (completely) so we can have a look.

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Cédric Moonen Software developer
Charting control

[FredrickNorge]

ok, ive tried without the #ifdef _DEBUG #include "stdafx.h" #include "resource.h" #include "Dialog1.h" #include "Dialog2.h" #include "assert.h" #include #include "Dialog3.h" #include #include /* Needed only for _O_RDWR definition */ #include #include #include "EmbeddedDialogDlg.h" #include "QuickMissLoadWriteEdit.h" #include #include "string.h" #include #include using namespace std; #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif code comes here

[Cedric Moonen]

Mmmh, I don't see really the problem here. Anyway, you are mixing deprecated header files with new ones. Remove all the include with a .h for the stadard library (stdio,io,string). I don't think this will solve the problem but check that first.

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Cédric Moonen Software developer
Charting control

[FredrickNorge]

ok, thanks anyway :)

[Maxwell Chen]

FredrickNorge wrote:

vs2005, when i want to debug my mfc app with #include fstream

FredrickNorge wrote:

1>C:\Program Files (x86)\Microsoft Visual Studio 8\VC\include\xdebug(32)

Generally speaking, in a MFC/VS2005 project of Debug configuration, the version of operator new being invoked is: "afxmem.cpp" line 59,

void* __cdecl operator new(size_t nSize, LPCSTR lpszFileName, int nLine)
{
return ::operator new(nSize, _NORMAL_BLOCK, lpszFileName, nLine);
}

And then "afxmem.cpp" line 393,

void* __cdecl operator new(size_t nSize, int nType, LPCSTR lpszFileName, int nLine)
{
#ifdef _AFX_NO_DEBUG_CRT
UNUSED_ALWAYS(nType);
UNUSED_ALWAYS(lpszFileName);
UNUSED_ALWAYS(nLine);
return ::operator new(nSize);
#else
void* pResult;
#ifdef _AFXDLL
_PNH pfnNewHandler = _pfnUninitialized;
#endif
for (;;)
{
pResult = _malloc_dbg(nSize, nType, lpszFileName, nLine);
if (pResult != NULL)
return pResult;

#ifdef _AFXDLL
if (pfnNewHandler == _pfnUninitialized)
{
AFX_MODULE_THREAD_STATE* pState = AfxGetModuleThreadState();
pfnNewHandler = pState->m_pfnNewHandler;
}
if (pfnNewHandler == NULL || (*pfnNewHandler)(nSize) == 0)
break;
#else
if (_afxNewHandler == NULL || (*_afxNewHandler)(nSize) == 0)
break;
#endif
}
return pResult;
#endif
}

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Maxwell Chen -- modified at 14:01 Tuesday 18th July, 2006

[FredrickNorge]

ok i tried to overide the calls, no luck :( . What ive done for now though, is commented the verry brief code that actualy use fstream when i debug, and uncomment it for the final release. Works ok for now...

[Maxwell Chen]

For this kind of problem, sometimes looking at the compilation log message may help. For example when you have such compilation output message as below:

Compiling ...
stdafx.cpp
test1.cpp
test2.cpp
test3.cpp
e:\wrkshp\test3.cpp(102) : error Cxxxx: blah blah blah
test4.cpp
test5.cpp
Test - 1 error(s), 0 warning(s)

Then you may try to back trace those existing definitions by looking at the included headers (and the related compilation units) in the last compilation (eg: test3.cpp) unit wherein errors are found.

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Maxwell Chen

[David Crow]

FredrickNorge wrote:

#include <assert.h> #include <Windows.h> #include <io.h> #include <fcntl.h> /* Needed only for _O_RDWR definition */ #include <share.h> #include <stdio.h> #include <iostream> #include <string.h> #include <string> #include <fstream>

Why don't you have these in the stdafx.h file?

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[FredrickNorge]

will do, thanks for all the inputt Maxwell Chen ;)