Short AppCommand = GET_APPCOMMAND_LPARAM(lParam) Process the hook if the hNotifyWnd window handle is valid LRESULT CALLBACK ShellProc(int nCode, WPARAM wParam, LPARAM lParam) Call SetMMShellHook after creating your window and UnSetMMShellHook before it gets destroyed. To unregister, UnSetMMShellHook() has to be called. The hook code just sends a WM_APPCOMMAND message every time the hook sees the HSHELL_APPCOMMAND code to a window that has installed the hook, by calling the SetMMShellHook(HWND hWnd) function of the hook DLL. This hook has to be in a DLL because only then can other processes than your own be hooked. Windows will call a shell hook with the hook code equal to HSHELL_APPCOMMAND if the active program doesn’t handle the WM_APPCOMMAND message.
So, what to do? The answer is that you have to write a DLL containg a shell hook. If your program is not active, it will not get the message. Now, by handling the WM_APPCOMMAND, your program will react to these keys, but only if the window with this windows proc is the active one, or one of its parent windows handles the message. This shows how to use the playing control keys, but you can use all other keys, too, if you use the corresponding APPCOMMAND_XXX code. handle other messages or call default window proc. Your window proc of your window that should handle the WM_APPCOMMAND message has to do something like the following code does: WM_APPCOMMAND can be found in winuser.h, if you have the right SDK headers. After reading some MSDN, I found out that you have to handle the WM_APPCOMMAND message, which is available to your program code, if you define _WIN32_WINNT=0x0500 (or higher) in your project. Musik also didn’t make use of the special keys, which I got accustomed to, so I started to add this feature for Windows. It is quite fast, at least faster than mediaplayer and musicmatch jukebox, concerning the startup time and media library browsing. This is a Linux/Windows MP3/Ogg player using wxwindows2 for the GUI and sqlite as the database. When I looked for a MP3/Ogg player with an integrated media library and available source code (so I could change things if neccesary), I stumbled over Musik. My version of Winamp sadly does not make use of the keys. The Windows media player can be controlled by these keys, even if it is in the background this is a very convenient feature. There are keys for controlling a media player and some browser keys, such as forward, back, and so forth. When I bought my current computer, it came with a multimedia keyboard that has a lot more keys than usual. Environment: VS.NET (2003), Windows 2000, Windows XP
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