ClearScreen(VC 語言命令)

ClearScreen，即清屏操作，方法是調用系統函式system傳送命令cls(system("cls");。

基本介紹

• 中文名：清屏操作
• 外文名：ClearScreen
• 系統：windows

方法

VC開發環境下實現控制台程式清屏的方法目前只有兩種：

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

具體實現代碼如下

/* Standard error macro for reporting API errors */

#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 }; /* here's where we'll home the

cursor */

BOOL bSuccess;

DWORD cCharsWritten;

CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */

DWORD dwConSize; /* number of character cells in

the current buffer */

/* get the number of character cells in the current buffer */

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "GetConsoleScreenBufferInfo" );

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

/* fill the entire screen with blanks */

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

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputCharacter" );

/* get the current text attribute */

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "ConsoleScreenBufferInfo" );

/* now set the buffer's attributes accordingly */

bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputAttribute" );

/* put the cursor at (0, 0) */

bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );

PERR( bSuccess, "SetConsoleCursorPosition" );

return;

}