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I am writing code for an x86 project in Studio 2022. The code comes from a book on game programming. Everytime I try to compile the program, I get the error message 2731 stating that the WinMain() function cannot be overloaded. My declaration is the following:
int APIENTRY wWinMain(In HINSTANCE hInstance, In_opt HINSTANCE hPrevInstance, In PSTR szCmdLine, In int iCmdShow)
If I leave out the 'I n' I get a linker error instead.
How can I fix this issue?
wWinMain is the Unicode entry point that VS creates. Try:
int WINAPI wWinMain(
_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nShowCmd
)
In addition to what @David Lowndes wrote. If you want the ANSI version, try
int WINAPI WinMain(
_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPSTR lpCmdLine,
_In_ int nShowCmd
)
The compiler will automatically make these extern"C", this means that WinMain is used for ANSI strings and wWinMain is used for Unicode.
I was creating a new project and trying to run it as an x86. I forgot to go into the project settings, Linker, System and change from Console subsystem to Windows subsystem. It will run without the annotations as long as everything is declared in the main file.