I have a few open sources that I have downloaded and I am wondering how do I compile them. I am using Microsoft Visual C plusplus 6.0 and I get tons of errors every time I try to. I create a new Win32 Console Application project and then I add the source files to the project. I then try to compile or build them, but it fails every time with like 20 to 50 errors. It looks like these are C plusplus files and that they do work since other people can comment about them. I have tried searching, but I can't find anything on this. A push in the right direction would be appreciated.

Perhaps you should tell us what source code you downloaded and what the errors are (all of them).

All I can tell you right now is that VC6 is outdated. You can get Visual C++ 2005 Express Edition freely from here. (Make sure you read this as well, if you plan on writing Win32 applications)


jfl.

Ok, I switched to VC 2005 and I installed the Platform SDK and updated the paths. I tried the new project from existing code and went through the process, but I still get these errors.

1>Compiling manifest to resources...
1>Linking...
1>libcmtd.lib(fpinit.obj) : error LNK2005: __fltused already defined in a previous module
1>libcmtd.lib(fpinit.obj) : error LNK2005: __ldused already defined in a previous module
1>libcmtd.lib(dbgheap.obj) : error LNK2005: __CrtSetCheckCount already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(_ctype.obj) : error LNK2005: _isalpha already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(_ctype.obj) : error LNK2005: _islower already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(_ctype.obj) : error LNK2005: _isdigit already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(setlocal.obj) : error LNK2005: __configthreadlocale already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(tidtable.obj) : error LNK2005: __encode_pointer already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(tidtable.obj) : error LNK2005: __decode_pointer already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(dbghook.obj) : error LNK2005: __crt_debugger_hook already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0dat.obj) : error LNK2005: _exit already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0dat.obj) : error LNK2005: __exit already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0dat.obj) : error LNK2005: __cexit already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0dat.obj) : error LNK2005: __amsg_exit already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0dat.obj) : error LNK2005: __initterm_e already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(mlock.obj) : error LNK2005: __lock already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(mlock.obj) : error LNK2005: __unlock already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(winxfltr.obj) : error LNK2005: __XcptFilter already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(crt0init.obj) : error LNK2005: ___xi_a already defined in MSVCRTD.lib(cinitexe.obj)
1>libcmtd.lib(crt0init.obj) : error LNK2005: ___xi_z already defined in MSVCRTD.lib(cinitexe.obj)
1>libcmtd.lib(crt0init.obj) : error LNK2005: ___xc_a already defined in MSVCRTD.lib(cinitexe.obj)
1>libcmtd.lib(crt0init.obj) : error LNK2005: ___xc_z already defined in MSVCRTD.lib(cinitexe.obj)
1>libcmtd.lib(hooks.obj) : error LNK2005: "void __cdecl terminate(void)" (?terminate@@YAXXZ) already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(invarg.obj) : error LNK2005: __invalid_parameter already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(invarg.obj) : error LNK2005: __invoke_watson already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(vsprintf.obj) : error LNK2005: _vsprintf already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(errmode.obj) : error LNK2005: ___set_app_type already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(dbgrptw.obj) : error LNK2005: __CrtDbgReportW already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(tolower.obj) : error LNK2005: _tolower already defined in MSVCRTD.lib(MSVCR80D.dll)
1>libcmtd.lib(ismbbyte.obj) : error LNK2005: __ismbblead already defined in MSVCRTD.lib(MSVCR80D.dll)
1>LINK : warning LNK4098: defaultlib 'MSVCRTD' conflicts with use of other libs; use /NODEFAULTLIB:library
1>MSVCRTD.lib(cinitexe.obj) : warning LNK4098: defaultlib 'libcmtd.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
1>libcmtd.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
fatal error LNK1120: 1 unresolved externals
32 error(s), 2 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Again, it would probably help if you told use what it is you are trying to compile, and in what form you got it.

I agree with jeroenb, it looks like a runtime library conflict. However, I'm surprised that this would arise if this is a project that you are compiling from source, and not a library file that has already been compiled. [edit] Are these the same errors that you were getting before? If not, then try a Build->Clean Solution.

Also, it shouldn't be a console application, apparently, as the last error message testifies to. Go to Project->Properties->Configuration Properties->Linker->System->SubSystem and set it to Windows (this should only solve the last error).


jfl.

I went into the runtime library and changed it from Multi-threaded Debug DLL (/MDD) to Multi-threaded Debug (/MTd) and now it works perfectly. Thanks for the help.