title: How to convert a command line string to hwnd in C++?
body: <p>I want to create a screen saver in C++ using OpenGL. The command line sent to my app for previewing the screen saver in a small window contains a number which is the <code>hwnd</code> of the small monitor window in screen saver control panel applet. how can I convert this string to a valid <code>hwnd</code>?</p>