LoadLibrary('user32.dll')返回14007

SetLastError(0); //To make sure there are no previous errors.
HINSTANCE hUserModule = LoadLibrary(L"User32.dll");
if (hUserModule == NULL) { //Checking if hUserModule is NULL
    MessageBoxA(NULL, "Fatal error", "", 16);
    ExitProcess(0);
} //hUserModule is not NULL
printf("%d\n", GetLastError()); //14007
DWORD paMessageBoxA = (DWORD)GetProcAddress(hUserModule, "MessageBoxA");
__MessageBoxA MsgBox = (__MessageBoxA)paMessageBoxA; //typedef int(__stdcall *__MessageBoxA)(HWND, LPCSTR, LPCSTR, UINT);
MsgBox(NULL, "", "", 64); //Application crahses

因此,hUserModule不是NULL,但也是无效的。为什么会这样?

编辑:GetModuleHandle也不工作