getmoderange gets the range of valid graphics modes for the given
graphics driver, graphdriver. The lowest permissible mode value is
returned in *lomode, and the highest permissible value is *himode. If
graphdriver specifies an invalid graphics driver, both *lomode and
*himode are set to -1. If the value of graphdriver is -1, the currently
loaded driver modes are given.
/* getmoderange example */
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main(void)
{
/* request autodetection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
int low, high;
char mrange[80];
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) { /* an error occurred */
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);/* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* get the mode range for this driver */
getmoderange(gdriver, &low, &high);
/* convert mode range info. into strings */
sprintf(mrange, "This driver supports modes %d..%d", low, high);
/* display the information */
settextjustify(CENTER_TEXT, CENTER_TEXT);
outtextxy(midx, midy, mrange);
/* clean up */
getch();
closegraph();
return 0;
}