C / C++ / MFC

<code>
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <stdio.h>
 #include <conio.h>
 
 // A do-nothing TIMERPROC.  Simply prints out the parameters
 VOID CALLBACK MyTimerProc( HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime );
 
 int main()
 {
     // Set up a 50 millisecond timer which calls MyTimerProc
     SetTimer( 0, 0, 0x50, (TIMERPROC)MyTimerProc );
 
     printf( "A timer proc has been set up.  Press any key to exit.\n");
 
     getch();    // Wait for user response.  This gives enough time for at
                 // least one timer cycle to have elapsed
 
     return 0;
 }
 
 VOID CALLBACK MyTimerProc( HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime )
 {
     printf( "In MyTimerProc: hwnd:%X  uMsg:%X  idEvent:%X  dwTime:%X\n",
             hwnd, uMsg, idEvent, dwTime );
 }
</code>