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Clearing the screen in dos

General and Gameplay Programming Programming

Started by Glandalf April 28, 2001 01:22 PM

5 comments, last by Glandalf 23 years, 9 months ago

Glandalf

Author

122

April 28, 2001 01:22 PM

I can''t seem to remember what the clear screen funciton is in dos. Or where I have to get it from. I remeber clrscn or something like that. Any help here would be great thanks

win32mfc

122

April 28, 2001 01:45 PM

I forget the exact name of the function, it usually depends on what compiler you have.

But, whatever the function is, you should be able to find it in the #include file "conio.h" - open it up with a text editor and see if you can find it!

// CHRIS

// CHRIS [win32mfc]

Anonymous

April 28, 2001 01:57 PM

If you''re using the latest version of Visual C++ you may be out of luck. For some reason Microsoft didn''t include all the conio.h functions. Useful functions like clrscr() and gotoxy() are missing.

Glandalf

Author

122

April 28, 2001 02:01 PM

Thanks thats the function I was forgetting, been awhile since I messed with dos, thanks again

Glandalf

Null and Void

1,088

April 28, 2001 04:04 PM

MSVC cannot compile for DOS. It can, however, compile to a Windows Console mode application, which means you can use Windows Console API functions, like this:

  bool Clear() {   HANDLE hconsole = GetStdHandle (STD_OUTPUT_HANDLE);   // get the number of character cells in the current buffer   CONSOLE_SCREEN_BUFFER_INFO csbi;   if (!GetConsoleScreenBufferInfo (hconsole, &csbi))       return false;   COORD coordScreen = { 0, 0 };    // here''s where we''ll home the cursor   DWORD cCharsWritten;             // number of chars written by console output routines   DWORD dwConSize = csbi.dwSize.X * csbi.dwSize.Y;   // fill the entire screen with blanks   return (FillConsoleOutputCharacter (hconsole, '' '', dwConSize, coordScreen, &cCharsWritten)              &&           FillConsoleOutputAttribute (hconsole, csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten) &&           SetConsoleCursorPosition   (hconsole, coordScreen));}

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Anonymous

April 28, 2001 06:42 PM

or you can do a cheap:
system("cls");

Zipster

2,420

April 28, 2001 09:40 PM

..or you could do it fast, which is what you should do. Some inline asm for ya:

  void ClearScreen(void){_asm {xor al, al ; Blank entire windowxor cx, cx ; Start at upper left (0,0)mov dh,24  ; Bottom line is y = 24mov dl,79  ; Right side is x = 79mov bh,7   ; Use normal attributesmov ah,6   ; Set SCROLL-UP functionint 10h    ; Call interrupt to clear DOS window}}

Clearing the screen in dos

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