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分享一段超简单但费解的代码，摘自msdn！！
BOOL CtrlHandler(DWORD fdwCtrlType)
{
switch (fdwCtrlType)
{
// Handle the CTRL+C signal.
case CTRL_C_EVENT:
Beep(1000, 1000);
return TRUE;
// CTRL+CLOSE: confirm that the user wants to exit.
case CTRL_CLOSE_EVENT:
return TRUE;
// Pass other signals to the next handler.
case CTRL_BREAK_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
default:
return FALSE;
}
}
void main(void)
{
BOOL fSuccess;
fSuccess = SetConsoleCtrlHandler(
(PHANDLER_ROUTINE) CtrlHandler, // handler function
TRUE); // add to list
if (! fSuccess)
MyErrorExit("Could not set control handler");
}
这个在控制台应该能够监测到ctrl+c和关闭消息，但是我这里怎么都失效了，系统根本没有调用回调函数！！
这是为何？？盼高手明示，在线等待，马上揭帖！！！
{
switch (fdwCtrlType)
{
// Handle the CTRL+C signal.
case CTRL_C_EVENT:
Beep(1000, 1000);
return TRUE;
// CTRL+CLOSE: confirm that the user wants to exit.
case CTRL_CLOSE_EVENT:
return TRUE;
// Pass other signals to the next handler.
case CTRL_BREAK_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
default:
return FALSE;
}
}
void main(void)
{
BOOL fSuccess;
fSuccess = SetConsoleCtrlHandler(
(PHANDLER_ROUTINE) CtrlHandler, // handler function
TRUE); // add to list
if (! fSuccess)
MyErrorExit("Could not set control handler");
}
这个在控制台应该能够监测到ctrl+c和关闭消息，但是我这里怎么都失效了，系统根本没有调用回调函数！！
这是为何？？盼高手明示，在线等待，马上揭帖！！！
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beyondtkl 2003-12-04
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學習..
ZhouBoTong 2003-12-04
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gz
leon_z 2003-12-04
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bool CtrlHandler(DWORD fdwCtrlType)
{
switch (fdwCtrlType)
{
// Handle the CTRL+C signal.
case CTRL_C_EVENT:
Beep(1000, 1000);
return TRUE;
// CTRL+CLOSE: confirm that the user wants to exit.
case CTRL_CLOSE_EVENT:
return TRUE;
// Pass other signals to the next handler.
case CTRL_BREAK_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
default:
return FALSE;
}
}
void main(void)
{
BOOL fSuccess;
fSuccess = SetConsoleCtrlHandler(
(PHANDLER_ROUTINE) CtrlHandler, // handler function
TRUE); // add to list
if (! fSuccess)
cout << "Could not set control handler" << endl;
cout << " Press Ctrl + C " << endl;
Sleep(10000);
char input;
cout << " Press Q or q " << endl;
for(;;)
{
cin >> input ;
if(input == 'Q' || input == 'q')
break;
}
cout << "Exit" << endl;
}
这样你就可以在按下Ctrl + C时听到BB声了
{
switch (fdwCtrlType)
{
// Handle the CTRL+C signal.
case CTRL_C_EVENT:
Beep(1000, 1000);
return TRUE;
// CTRL+CLOSE: confirm that the user wants to exit.
case CTRL_CLOSE_EVENT:
return TRUE;
// Pass other signals to the next handler.
case CTRL_BREAK_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
default:
return FALSE;
}
}
void main(void)
{
BOOL fSuccess;
fSuccess = SetConsoleCtrlHandler(
(PHANDLER_ROUTINE) CtrlHandler, // handler function
TRUE); // add to list
if (! fSuccess)
cout << "Could not set control handler" << endl;
cout << " Press Ctrl + C " << endl;
Sleep(10000);
char input;
cout << " Press Q or q " << endl;
for(;;)
{
cin >> input ;
if(input == 'Q' || input == 'q')
break;
}
cout << "Exit" << endl;
}
这样你就可以在按下Ctrl + C时听到BB声了
winkiky 2003-12-04
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但是按照msdn的说法，这个回调函数应该类似钩子的那种，消息首先经过这个回调函数的，如果返回true，就不继续给下一个处理函数，否则才传递给缺省系统处理的。
When a CTRL+C signal is received, the control handler returns TRUE, indicating that it has handled the signal. Doing this prevents other control handlers from being called
When a CTRL+C signal is received, the control handler returns TRUE, indicating that it has handled the signal. Doing this prevents other control handlers from being called
leon_z 2003-12-04
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你的程序一运行就执行完了，没有阻断和监控的话，对于基于事件编程，是没法实现的
你按下Ctrl + c时，程序都已经退出了
你按下Ctrl + c时，程序都已经退出了
