c++控制台也能捕捉事件喽，防止误关闭的函数~~

#include <windows.h> 
#include <stdio.h> 
bool ctrlhandler( DWORD fdwctrltype ) 
{ 
    switch( fdwctrltype ) 
    { 
    // handle the ctrl-c signal. 
    case CTRL_C_EVENT: 
        printf( "ctrl-c event

" );
          _sleep(2000);
        return( true );
    // ctrl-close: confirm that the user wants to exit. 
    case CTRL_CLOSE_EVENT: 
        printf( "ctrl-close event

" );
          _sleep(2000);
        return( true ); 
    // pass other signals to the next handler. 
    case CTRL_BREAK_EVENT: 
        printf( "ctrl-break event

" );
        return false; 
    case CTRL_LOGOFF_EVENT: 
        printf( "ctrl-logoff event

" );
          _sleep(2000);
        return false; 
    case CTRL_SHUTDOWN_EVENT: 
        printf( "ctrl-shutdown event

" );
        _sleep(2000);
        return false; 
    default: 
        return false; 
    } 
} 
int main( void ) 
{ 
    if( SetConsoleCtrlHandler( (PHANDLER_ROUTINE) ctrlhandler, true ) ) 
    { 
        printf( "
the control handler is installed.
" ); 
        printf( "
 -- now try pressing ctrl+c or ctrl+break, or" ); 
        printf( "
 try logging off or closing the console...
" ); 
        printf( "
(...waiting in a loop for events...)

" ); 
       while( 1 ){ Sleep(100);} 
    } 
else 
    printf( "
error: could not set control handler"); 
}

 CTRL_C_EVENT
一個Ctrl + C的信號被接收，該信號或來自鍵盤，或來自GenerateConsoleCtrlEvent
函數

CTRL_BREAK_EVENT
一個 Ctrl + Break
信號被接收，該信號或來自鍵盤，或來自GenerateConsoleCtrlEvent
函數

CTRL_CLOSE_EVENT
當用戶系統關閉Console時，系統會發送此信號到此

CTRL_LOGOFF_EVENT
當用戶退出系統時系統會發送這個信號給所有的Console程序。該信號不能顯示是哪個用戶退出。

CTRL_SHUTDOWN_EVENT
當系統將要關閉時會發送此信號到所有Console程序。