Question

我正在编写一个程序，在屏幕上显示一些信息，我希望它们每秒更新一次。

我该怎么办？

我正在Windows上编写一个C控制台应用程序。

Answer 1

钢琴家，您可以使用WinAPI功能使用控制台。

HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
if (!hConsole)
    return;

之后确定光标位置：

CONSOLE_SCREEN_BUFFER_INFO csbi = {0};
GetConsoleScreenBufferInfo(hConsole, &csbi);
COORD coordCur = csbi.dwCursorPosition;

和...

while (TRUE) {  // your cycle goes here
    // ...
    // now you can change position of the cursor
    coordCur.X = newX;
    coordCur.Y = newY;
    SetConsoleCursorPosition(hConsole, coordCur);
    // and print any information from the new position
    printf("..."); // old text will be replaced
}

因此，如果您想要更改一小段文本，则无需清除和刷新所有控制台。

PS。不要忘记释放句柄：

CloseHandle(hConsole);

Answer 2

由于您使用的是Windows，因此可以执行以下操作：

system('cls')

以下是一个例子：

#include <stdio.h>

int main()
{
    printf("Press enter to clear the screen.");
    getchar();
    system("cls");
    return 0;
}

如果您正在使用Microsoft Visual Studoo进行开发，并且希望以编程方式通过输出空格来清除屏幕，请参阅http://msdn.microsoft.com/en-us/library/windows/desktop/ms682022(v=vs.85).aspx上的示例2。

Answer 3

如果您在询问之前搜索过Google，则会在第一个结果中找到this link。

引用其中一种方法：

<强>窗：

#include <windows.h>

void ClearScreen()
  {
  HANDLE                     hStdOut;
  CONSOLE_SCREEN_BUFFER_INFO csbi;
  DWORD                      count;
  DWORD                      cellCount;
  COORD                      homeCoords = { 0, 0 };

  hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
  if (hStdOut == INVALID_HANDLE_VALUE) return;

  /* Get the number of cells in the current buffer */
  if (!GetConsoleScreenBufferInfo( hStdOut, &csbi )) return;
  cellCount = csbi.dwSize.X *csbi.dwSize.Y;

  /* Fill the entire buffer with spaces */
  if (!FillConsoleOutputCharacter(
    hStdOut,
    (TCHAR) ' ',
    cellCount,
    homeCoords,
    &count
    )) return;

  /* Fill the entire buffer with the current colors and attributes */
  if (!FillConsoleOutputAttribute(
    hStdOut,
    csbi.wAttributes,
    cellCount,
    homeCoords,
    &count
    )) return;

  /* Move the cursor home */
  SetConsoleCursorPosition( hStdOut, homeCoords );
  }

Answer 4

该主题有一个KB article。

两个选项：

编写一个以编程方式清除屏幕的功能

/* 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;
}

使用系统函数（不是很漂亮;需要启动shell和命令）
```
system("cls");
```

如何更新（刷新）控制台屏幕？

4 个答案: