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Link Errors


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#1 Machaira   Moderators   -  Reputation: 1028

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Posted 26 October 1999 - 04:37 PM

Can anyone interpret these link errors? I know it has something to do with the placement of the #include afx.h line, but I'm not sure why?

nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in LIBCD.lib(dbgdel.obj)
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex

The afx.h is in a main header file (it's also the only thing in the header) and is included in 4 other headers, my DirectDraw class header, my map class header, my DirectSound class header, and a class I have for handling rooms in my RPG.

Any help would be appreciated. If you need more info please let me know.

Thanks


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#2 mhkrause   Members   -  Reputation: 122

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Posted 23 October 1999 - 06:28 PM

I'm not sure about the the first one, but the last two are functions defined in the multithreaded library, not the single threaded library which you are linking with.

#3 Machaira   Moderators   -  Reputation: 1028

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Posted 23 October 1999 - 06:46 PM

Forgive me for sounding stupid but, HUH? So where did the library that is referenced come from? The only help I could find on this error in the help files had something to do with a switch that is not set in my project.

#4 CJ   Members   -  Reputation: 122

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Posted 23 October 1999 - 11:52 PM

the first one means that you've included a header in a file, and that one includes another header which includes also the same header. I don't really know how to explain, but if you play with your headers, then you'll find that the first error, will suddenly diappear.

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#5 mhkrause   Members   -  Reputation: 122

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Posted 24 October 1999 - 06:36 AM

In VC, if you want to use beginthread, beginthreadex, endthread, etc., you must link with the multithreaded library. In Project Settings, under C++/Code Generation, select one of the "multithreaded" libraries to link with it.



#6 Machaira   Moderators   -  Reputation: 1028

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Posted 26 October 1999 - 04:37 PM

OK, I've narrowed this problem down to one chunk of code:

code:

bool CMap::Load(char* lpsFileName)
{
//CFile MapFile;
/*if (!MapFile.Open(lpsFileName, CFile::modeRead | CFile::typeBinary))
{
TRACE("Unable to open map file %s\n", lpsFileName);
return false;
}*/

//Make sure file is a DemonRift map file.
//1st line should be "DEMONRIFT"
char sFileTag[10];
//MapFile.Read(sFileTag,9);
sFileTag[9] = 0;
if (strcmp(sFileTag, "DEMONRIFT") != 0)
{
//TRACE("&s is not a valid DemonRift map file\n", lpsFileName);
return false;
}

//Make sure map version is the same as the game
short iMapVersion;
//MapFile.Read(&iMapVersion, sizeof(iMapVersion));
if (iMapVersion != iVersion)
{
//TRACE("Map %s is version %d and the game is version %d\n", lpsFileName, iMapVersion, iVersion);
return false;
}

//MapFile.Read(&iWidth, sizeof(iWidth));
//MapFile.Read(&iHeight, sizeof(iHeight));

for(short i=0;i<=iWidth;i++)
{
for(short j=0;j<=iHeight;j++)
{

}
}

return true;
}


Uncommenting any one of the commented out lines of code produces this link error:

nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in LIBCMTD.lib(dbgdel.obj)
Debug/DemonRift.exe : fatal error LNK1169: one or more multiply defined symbols found

I've changed the library to the multi-threaded version. What is weird is that uncommenting one of the TRACE lines produces the same error as uncommenting say the

CFile MapFile;

line.

The afx.h file is in a header (the only thing in that header) that is only included in one other place, my sound class, which only initialized DirectSound, sets the coop level, creates a buffer and sets it's format.

Any ideas or suggestions would be appreciated.






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