// Load the injected DLL into this process
HMODULE h = LoadLibrary("mydll.dll");
if(!h)
{
    MessageBox(0, "Could not load the dll", "Error", MB_ICONERROR);
    ExitProcess(0);
}

// Get the address of the export function
FARPROC p = GetProcAddress(h, "Initialize");
if(!p)
{
    MessageBox(0, "Could not load the function", "Error", MB_ICONERROR);
    ExitProcess(0);
}

// So we do not need a function pointer interface
__asm call p

// Exit the thread so the loader continues
ExitThread(0);