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Annotation of mstools/samples/console/handler.c, revision 1.1

1.1     ! root        1: #include <windows.h>
        !             2: #include <string.h>
        !             3: #include "console.h"
        !             4: 
        !             5: HANDLE hConsole; /* current console output handle */
        !             6: 
        !             7: /*******************************************************************
        !             8: * FUNCTION: handler_routine(DWORD dwCtrlType)                      *
        !             9: *                                                                  *
        !            10: * PURPOSE: this is the control handler routine activated by ctrl+c *
        !            11: *          or ctrl+break keys                                      *
        !            12: *                                                                  *
        !            13: * INPUT: the type of control event                                 *
        !            14: *******************************************************************/
        !            15: 
        !            16: BOOL handler_routine(DWORD dwCtrlType)
        !            17: {
        !            18:   CHAR szTemp[64];
        !            19: 
        !            20:   /* print out what control event was received to the current console */
        !            21:   switch(dwCtrlType)
        !            22:     {
        !            23:     case CTRL_C_EVENT:
        !            24:       strcpy(szTemp, "CTRL_C_EVENT");
        !            25:       break;
        !            26:     case CTRL_BREAK_EVENT:
        !            27:       strcpy(szTemp, "CTRL_BREAK_EVENT");
        !            28:       break;
        !            29:     default:
        !            30:       strcpy(szTemp, "unknown event");
        !            31:       break;
        !            32:     }
        !            33:   strcat(szTemp, " detected");
        !            34:   myPuts(hConsole, szTemp);
        !            35:   return(TRUE);
        !            36: }
        !            37: 
        !            38: 
        !            39: /*********************************************************************
        !            40: * FUNCTION: demoSetCtrlHandler(HANDLE hConOut)                       *
        !            41: *                                                                    *
        !            42: * PURPOSE: demonstrate SetConsoleCtrlHandler by setting a ctrl+break *
        !            43: *          and ctrl+c handler. When the user hits either one of      *
        !            44: *          these keys, a message is printed to the console           *
        !            45: *          indicating the event.                                     *
        !            46: *                                                                    *
        !            47: * INPUT: the output handle to write to                               *
        !            48: *********************************************************************/
        !            49: 
        !            50: void demoSetCtrlHandler(HANDLE hConOut)
        !            51: {
        !            52:   BOOL bSuccess;
        !            53: 
        !            54:   setConTitle(__FILE__);
        !            55:   hConsole = hConOut; /* set global console output handle for handler */
        !            56:   myPuts(hConOut, "Let's install a ctrl+c and ctrl+break handler for this\n"
        !            57:                   "process. Hit ctrl+c and ctrl+break a few times to test\n"
        !            58:                   "the handler. Hit enter to return...");
        !            59:   /* set handler for this process */
        !            60:   bSuccess = SetConsoleCtrlHandler(handler_routine, TRUE);
        !            61:   PERR(bSuccess, "SetConsoleCtrlHandler");
        !            62:   /* wait for user to hit enter */
        !            63:   while (myGetchar() != 0xd)
        !            64:     ;
        !            65:   /* remove our handler from the list of handlers */
        !            66:   bSuccess = SetConsoleCtrlHandler(handler_routine, FALSE);
        !            67:   PERR(bSuccess, "SetConsoleCtrlHandler");
        !            68:   return;
        !            69: }

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