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c++winapimonitor

Windows7.1 SDK: C2373: "MonitorFromWindow" Redefinition

The error "linkage specification is incompatible with previous "MonitorFromWindow"" in 32 bit build VS10 MCBS is given for the following decl:

 int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
    HMONITOR MonitorFromWindow(_In_ HWND  hwnd, _In_ DWORD dwFlags);

    return DialogBoxW(hInstance, MAKEINTRESOURCEW(lpTemplate), nullptr, DlgProc);
}

Assumed the solution would be similar to the one given here, but here it might be some problem with the SDK although some kind of header hack is preferred.

Solution

  • The error is telling you that your declaration of MonitorFromWindow conflicts with the prior declaration. The prior declaration in Winuser.h declared the function with extern "C" linkage, is __declspec(dllimport) and has the __stdcall calling convention.

    You should remove your erroneous declaration and use that from the header file.