函数名: setgraphmode

功 能: 将系统设置成图形模式且清屏

用 法: void far setgraphmode(int mode);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int x, y;

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

{

printf("Graphics error: %s\", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

x = getmaxx() / 2;

y = getmaxy() / 2;

/* output a message */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "Press any key to exit graphics:");

getch();

/* restore system to text mode */

restorecrtmode();

printf("We're now in text mode.\");

printf("Press any key to return to graphics mode:");

getch();

/* return to graphics mode */

setgraphmode(getgraphmode());

/* output a message */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "We're back in graphics mode.");

outtextxy(x, y+textheight("W"), "Press any key to halt:");

/* clean up */

getch();

closegraph();

return 0;

}