ID Number: Q43914
5.10 6.00 6.00a 6.00ax 7.00
MS-DOS
Summary:
In Microsoft C versions 5.0, 5.1, 6.0, 6.0a, 6.0ax, and C/C++ version
7.0, after a call to _getvideoconfig () from text modes, the structure
videoconfig contains zero (0) for numxpixels, numypixels, and
bitsperpixel. This is expected behavior because only the graphics
modes return pixel information.
Both text and graphics modes return information about the number of
text columns and rows. The sample code below demonstrates the absence
of pixel information in text modes. The name of each text mode begins
with "_TEXT."
The definition of the videoconfig structure and the arguments to
_setvideomode() are contained in the include file GRAPH.H.
Sample Code
-----------
/* Compile options needed: none
*/
#include <stdio.h>
#include <graph.h>
struct videoconfig vc; /* Variable vc of type videoconfig */
/* Define an array of video modes and mode names
because the numbers are not continuous */
int modes[12] = {_TEXTBW40, _TEXTC40, _TEXTBW80, _TEXTC80,
_MRES4COLOR, _MRESNOCOLOR, _HRESBW, _TEXTMONO,
_MRES16COLOR, _HRES16COLOR, _ERESNOCOLOR, _ERESCOLOR};
char *modenames[] = {"TEXTBW40", "TEXTC40", "TEXTBW80",
"TEXTC80", "MRES4COLOR", "MRESNOCOLOR",
"HRESBW", "TEXTMONO", "MRES16COLOR",
"HRES16COLOR", "ERESNOCOLOR", "ERESCOLOR"};s0
void main(void)
{
int i;
/* Test all video modes */
for (i=0; i<= 11; i++) {
_setvideomode (modes[i]);
_getvideoconfig (&vc);
printf ("\n video mode: \t%s\n",modenames[i]);
printf (" x pixels: \t%d\n",vc.numxpixels);
printf (" y pixels: \t%d\n",vc.numypixels);
printf (" text columns: \t%d\n",vc.numtextcols);
printf (" text rows: \t%d\n",vc.numtextrows);
printf (" # of colors: \t%d\n",vc.numcolors);
printf (" bits/pixel: \t%d\n",vc.bitsperpixel);
printf (" video pages: \t%d\n",vc.numvideopages);
printf (" Hit return for next video mode");
getchar();
_clearscreen (_GCLEARSCREEN);
}
_setvideomode (_DEFAULTMODE);
}
Additional reference words: 5.00 5.10 6.00 6.00a 6.00ax 7.00