Why does GetProcAddress not work with OutputDebugString function

Question

I have been trying to use GetProcAddress with several functions from kernel32.dll. It worked fine, except with "OutputDebugString" function.

My code:

typedef void(WINAPI *LPGETNUMBER)(LPCTSTR);

int main() {
    const LPGETNUMBER pAddr = (LPGETNUMBER)GetProcAddress(GetModuleHandle((LPCSTR)("kernel32.dll")), "OutputDebugString");
    if (NULL == pAddr) {
        int32_t nLastErrorCode = GetLastError();
    }
}

Answer 1

There is no such function. The exports are named OutputDebugStringA and OutputDebugStringW.

https://msdn.microsoft.com/en-us/library/windows/desktop/aa363362

Answer 2

The OutputDebugString is a macro expanding to either OutputDebugStringA or OutputDebugStringW depending on whether you are building with ANSI or Unicode. So you need to choose one of those (preferably, but not necessarily, depending on your build mode).