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1996-11-24
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126 lines
+++Date last modified: 27-Oct-1996
C Language Topic: Clearing a Text Mode DOS PC screen
====================================================================
Compiled by Mike Demski - 75324.3574@compuserve.com
The following question is often asked in the FidoNet C_ECHO and
other C/C++ programming forums/areas:
"How do I clear a "text mode DOS PC" screen using the C Language?"
Answers to the above question vary. First, if portability is of
concern, a portable clear screen function "clrscr()" exists within
the SNIPPETS archive. Within SNIPPETS, please refer to:
"Vidport.C - DOS: Portable gotoxy(), clrscr(), etc. equivalents"
Also, many compiler vendors supply a clear screen function,
which is "compiler specific" (i.e. - non portable). (See below.)
====================================================================
Compiler (Vendor) * Clear Screen Function * Header File
====================================================================
Borland Turbo C++ 3.0, * clrscr() * conio.h
Borland C++ 3.x, 4.xx * *
--------------------------------------------------------------------
M.S. Quick C 2.5, * *
M.S. Visual C++ 1.52, * _clearscreen() * graph.h
Watcom C/C++ 10.x * *
--------------------------------------------------------------------
Mix Power C 2.2.0 * clrscrn() * bios.h
--------------------------------------------------------------------
Symantec C++ v7.x, * [ See example below ] * disp.h
Zortech C 2.18 * disp_xxxx() family *
--------------------------------------------------------------------
Examples of specific vendor approaches to clearing a PC screen in DOS:
--------------------------------------------------------
/* Example - Borland Turbo C++ 3.0, Borland C++ 3.1, and
Borland C++ 4.x Clear Screen (DOS PC) */
#include <conio.h>
int main(void)
{
clrscr();
return 0;
}
--------------------------------------------------------
--------------------------------------------------------
/* Example - M.S. Quick C 2.5, M.S. VC++ 1.52, and
Watcom 10.x Clear Screen (DOS PC) */
#include <graph.h>
int main(void)
{
_clearscreen(_GCLEARSCREEN); /* or _clearscreen(0) */
return 0;
}
--------------------------------------------------------
--------------------------------------------------------
/* Example - Power C 2.2.0 Clear Screen (DOS PC) */
#include <bios.h>
int main(void)
{
clrscrn();
return 0;
}
--------------------------------------------------------
To clear the PC screen in DOS with Symantec C++ or
Zortech C++, use the disp_xxxx() functions to set the
cursor to the beginning of the screen and then call the
disp_eeop() function to erase to the end of the screen.
--------------------------------------------------------
/* Example - Symantec C++ and Zortech C++ (all versions)
Clear Screen (DOS PC) */
#include <disp.h>
int main(void)
{
disp_open();
disp_move(0, 0);
disp_eeop();
disp_close();
return 0;
}
--------------------------------------------------------
========================================================
Furthermore, when using ANSI.SYS (or an equivalent), one
may clear the screen using ANSI screen control codes.
Within the SNIPPETS archive, please refer to ANSISCRN.H,
which defines: ANSI_cls(), or note the following equivalent
ANSI screen control code clear screen example:
--------------------------------------------------------
/* Example - Using ANSI screen control codes to
Clear Screen (DOS PC)
Note: ANSI.SYS or equivalent must be loaded
for this example to clear the PC screen. */
#include <stdio.h>
#define ESC 27
int main(void)
{
printf("%c[2J", ESC);
return 0;
}
--------------------------------------------------------