Intercepting the X button

[Rebel]

I have been browsing the Internet for C-code (or technique) that when a user closes a Windows console application via the X button intercepts the signal and moves to a predefined routine such as you can do intercepting CTRL_C and CTRL_BREAK.

In the meantime I wonder if that is possible at all.

[rvida]

I have been browsing the Internet for C-code (or technique) that when a user closes a Windows console application via the X button intercepts the signal and moves to a predefined routine such as you can do intercepting CTRL_C and CTRL_BREAK.

In the meantime I wonder if that is possible at all.

Use SetConsoleCtrlHanlder() API to install the handler:

Code: Select all

if (SetConsoleCtrlHandler(
    (PHANDLER_ROUTINE)ConsoleHandler,TRUE)==FALSE)
{
    printf("Unable to install handler!\n");
    return -1;
}

When the user presses the X button your handler will be invoked with CTRL_CLOSE_EVENT parameter. Note that there is a 5 second timeout in which it must return before the app will be forcibly terminated.

Code: Select all

BOOL WINAPI ConsoleHandler(DWORD CEvent)
{
    switch(CEvent)
    {
    case CTRL_C_EVENT:
        MessageBox(NULL,
            "CTRL+C received!","CEvent",MB_OK);
        break;
    case CTRL_BREAK_EVENT:
        MessageBox(NULL,
            "CTRL+BREAK received!","CEvent",MB_OK);
        break;
    case CTRL_CLOSE_EVENT:
        MessageBox(NULL,
            "Program being closed!","CEvent",MB_OK);
        break;
    case CTRL_LOGOFF_EVENT:
        MessageBox(NULL,
            "User is logging off!","CEvent",MB_OK);
        break;
    case CTRL_SHUTDOWN_EVENT:
        MessageBox(NULL,
            "User is logging off!","CEvent",MB_OK);
        break;

    }
    return TRUE;
}

[Rebel]

This is cool. Thank you.