WinMain code doesn't work

Question

#include <Windows.h>

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevious, PSTR cmdLine, int nCmdShow)
{
	return MessageBox(NULL, "hello, world", "caption", 0);
}

This code, straight off the docs page doesn't work in a couple of ways.

1. The string literals in the call to MessageBox are invalid - argument of type const char * is incompatible with parameter of type LPCWSTR
2. Even if I replace the MessageBox call with MessageBoxA to workaround that issue I get unresolved external symbol main referenced in function "int__cdecl invoke_main(void)"

Answer 1

Hi, Gavin Williams

1. MessageBox(NULL, "hello, world", "caption", 0); applies to non-Unicode character sets. Add L if using Unicode

return MessageBox(NULL, L"hello, world", L"caption", 0);

2. Set Sub System-> Windows.

Best regards,

Minxin Yu

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