GetSystemMetrics() returns wrong value for SM_CXSCREEN

Question

I\'ve run into an interesting problem. At least in Vista, getSystemMetrics(SM_CXSCREEN) returns an incorrect value when the desktop DPI settings aren\'t set at 100%. For exa

Answer 1

A program must tell the operating system that it is DPI-aware to get the true resolution when you go past 125%. That's best done with a manifest, as explained in this MSDN Library article.