SetConsoleCtrlHandler演示

#include "stdafx.h"
#include <Windows.h>




static BOOL WINAPI Handler(DWORD cntrlEvent);
static BOOL exitFlag = FALSE;

int _tmain(int argc, LPTSTR argv[])

/* Beep periodically until signaled to stop. */
{
        /* Add an event handler. */
    if (SetConsoleCtrlHandler(Handler, TRUE)==FALSE)
        printf("Unable to install handler! ");
    
    while (!exitFlag) { /* This flag is detected right after a beep, before a handler exits */
        Sleep(4750); /* Beep every 5 seconds; allowing 250 ms of beep time. */
        Beep(1000 /* Frequency */, 250 /* Duration */);
    }
    _tprintf(_T("Stopping the main program as requested. "));
    return 0;
}    

BOOL WINAPI Handler(DWORD cntrlEvent)
{
    switch (cntrlEvent) {
        /* The signal timing will determine if you see the second handler message */
        case CTRL_C_EVENT:
            _tprintf(_T("Ctrl-C received by handler. Leaving in 5 seconds or less. "));
            exitFlag = TRUE;
            Sleep(4000); /* Decrease this time to get a different effect */
            _tprintf(_T("Leaving handler in 1 second or less. "));
            return TRUE; /* TRUE indicates that the signal was handled. */
        case CTRL_CLOSE_EVENT:
            _tprintf(_T("Close event received by handler. Leaving the handler in 5 seconds or less. "));
            exitFlag = TRUE;
            Sleep(4000); /* Decrease this time to get a different effect */
            _tprintf(_T("Leaving handler in 1 second or less. "));
            return TRUE; /* Try returning FALSE. Any difference? */
        default:
            _tprintf(_T("Event: %d received by handler. Leaving in 5 seconds or less. "), cntrlEvent);
            exitFlag = TRUE;
            Sleep(4000); /* Decrease this time to get a different effect */
            _tprintf(_T("Leaving handler in 1 seconds or less. "));
            return TRUE; /* TRUE indicates that the signal was handled. */
    }
}