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Error C2731: "wWinMain": The function cannot be overloaded

I upgraded an old project from VC6 to VS2008 and now I am getting this compilation error:

error C2731: 'wWinMain' : function cannot be overloaded

In these lines of code:

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)

The same project is compiled under VC6.

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2 answers


Thanks everyone, I finally found the real culprit, it's a typo, I'm using LPSTR lpCmdLine

instead LPTSTR lpCmdLine

. The real mystery is why it compiles at all under VC6 - it used to wWinMain

, but somehow it was okay to have lpCmdLine char *

instead WCHAR *

.

Now I changed it to:

int APIENTRY _tWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPTSTR    lpCmdLine,
                       int       nCmdShow)

And it works under VS2008 too.



Edit: I compiled successfully and even ran the program with this function definition in VC6:

int APIENTRY wWinMain(int *hInstance, float hPrevInstance, int *lpCmdLine, float nCmdShow)
{
    MessageBox(0,L"Running.",0,0);
    return 0;
}

Interestingly, replacing float nCmdShow

with double nCmdShow

gives a linker error, I assume the float is 32 bit, but the double is not.

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I had the same error with a Win32 console application. Fixed:



  • Open Project> Properties ...,
  • Expand Configuration Options> Linker> System
  • Install SubSystem for installation
  • Click "OK"
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