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C – Catching System Events

Aug 22nd, 2012 by

This is a example code that shows how to catch interruption signals on a Windows system and what you can do when such signals are sent to your application. Interruption signals are for example control-c, a break or shutdown event.



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#include <windows.h>
#include <stdio.h>
 
 
 
/*
 *
 */
BOOL APE_ControlHandler(DWORD pControlType);
 
 
int main()
{
  int lRetVal = 0;
 
  // Register the event handler
  SetConsoleCtrlHandler((PHANDLER_ROUTINE) APE_ControlHandler, TRUE);
 
  while (1)
	Sleep(100);
 
  return(lRetVal);
}
 
 
 
/*
 *
 */
BOOL APE_ControlHandler(DWORD pControlType)
{
 
  switch(pControlType) 
  { 
    // Handle the CTRL-C signal. 
    case CTRL_C_EVENT:
      Beep(500, 200);
      printf("Ctrl-C event : Starting depoisoning process");
      return(FALSE);
 
    case CTRL_CLOSE_EVENT:
      Beep(600, 200);
      printf("Ctrl-Close event : Starting depoisoning process");
      return(FALSE); 
 
    case CTRL_BREAK_EVENT:
      Beep(700, 200);
      printf("Ctrl-Break event : Starting depoisoning process");
      return(FALSE);
 
    case CTRL_LOGOFF_EVENT:
      Beep(800, 200);
      printf("Ctrl-Logoff event : Starting depoisoning process");
      return(FALSE); 
 
    case CTRL_SHUTDOWN_EVENT:
      Beep(900, 200);
      printf("Ctrl-Shutdown event : Starting depoisoning process");
      return(FALSE); 
 
    default:
      Beep(1000, 200);
      printf("Unknown event \"%d\" : Starting depoisoning process", pControlType);
      return(FALSE);
  }
}


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posted in C, Coders corner