Date: 2014jul25 Platform: Windows Product: MSVC Language: C/C++ Q. How should I avoid a warning about an unreferenced parameter? A. There are four ways. 1. Globally turn off the warning - UNSAFE 2. Use pragma to turn off the warning - NOT SO PRETTY 3. Remove the name of the parameter 4. Use the UNREFERENCED_PARAMETER() macro I'll show the last two ways since those are what I prefer. An example of code that will get the warning:

BOOL APIENTRY DllMain(HMODULE hModule, DWORD fdwReason, LPVOID lpReserved) { }

3. Remove the name of the parameters:

BOOL APIENTRY DllMain(HMODULE, DWORD, LPVOID) { }

This is ok but then you don't get the name in tool tips. But if the type describes the parameter you are fine. 4. Use the macro:

BOOL APIENTRY DllMain(HMODULE hModule, DWORD fdwReason, LPVOID lpReserved) { UNREFERENCED_PARAMETER(hModule); UNREFERENCED_PARAMETER(fdwReason); UNREFERENCED_PARAMETER(lpReserved); }

Or use a mix:

BOOL APIENTRY DllMain(HMODULE, DWORD fdwReason, LPVOID) { UNREFERENCED_PARAMETER(fdwReason); }

Here, we remove the name for the first parameter since HMODULE describes it. And the last parameter isn't used. But DWORD doesn't describe the second parameter so we use the macro.