BUG: Windows 95 Access Violation Error After Disabling CTRL+C

- Microsoft Win32 Application Programming Interface (API) included with:

   - Microsoft Windows 95

SYMPTOMS

In a Win32 environment, a console application can be terminated by pressing CTRL+C. To disable CTRL+C input, a console application can call the SetConsoleCtrlHandler(NULL, TRUE) API function.

When this API function is called in Windows NT, CTRL+C is ignored if pressed. However, when it is called in Windows 95, pressing CTRL+C generates an Access Violation error. Similarly, when this API is called in Windows 95, pressing CTRL+BREAK generates an Access Violation error.

RESOLUTION

There are two alternatives when you want to disable CTRL+C and avoid generating an Access Violation error:

1. Install a console control handler to capture and ignore the CTRL+C keypress:

         SetConsoleCtrlHandler(MyHandler, TRUE);
         BOOL MyHandler(DWORD dwEventType)
         {
            if ( dwEvnetType == CTRL_C_EVENT
            if ( dwEventType == CTRL_C_EVENT )
               return TRUE;   // CTRL+C handle by function
            else
               return FALSE;  // pass to next handler
         }
   
      -or-
   
   

2. Disable CTRL+C by disabling the ENABLE_PROCESSED_INPUT console mode. Disabling the ENABLE_PROCESSED_INPUT console mode then reports CTRL+C to the input buffer, not the system:

         SetConsoleMode( hConsoleHandle,
             (Mode & ~ ENABLE_PROCESSED_INPUT) );
   
   

STATUS