ClearScreen

VC開發環境下實現控制台程序清屏的方法目前只有兩種：

一種是眾所周知的調用系統函數system發送命令cls(system("cls");)實現，但這種辦法有缺陷，程序需要執行系統程序完成清屏操作，這加大了運行負擔。對此，微軟MSDN有一個解決方法，用戶自己在程序中添加下列代碼，調用ClearScreen函數也可以完成清屏操作，類似BC和TC下的Clrscr函數。

#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %d from %s \

on line %d\n", __FILE__, GetLastError(), api, __LINE__);}

void cls( HANDLE hConsole )

{

COORD coordScreen = { 0, 0 };

BOOL bSuccess;

DWORD cCharsWritten;

CONSOLE_SCREEN_BUFFER_INFO csbi;

DWORD dwConSize;

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "GetConsoleScreenBufferInfo" );

dwConSize = csbi.dwSize.X * csbi.dwSize.Y;

bSuccess = FillConsoleOutputCharacter( hConsole, (TCHAR) ' ',

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputCharacter" );

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "ConsoleScreenBufferInfo" );

bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputAttribute" );

bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );

PERR( bSuccess, "SetConsoleCursorPosition" );

return;

}