setvisualpage

setvisualpage是一种函数，用于设置可见图形页号。

setvisualpage详细介绍

setvisualpage是一种函数，用于设置可见图形页号。

程序例子

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

int gdriver = EGA, gmode = EGAHI, errorcode;

int x, y, ht;

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

errorcode = graphresult();

if (errorcode != grOk)

{

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

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

getch();

exit(1);

}

x = getmaxx() / 2;

y = getmaxy() / 2;

ht = textheight("W");

setactivepage(1);

line(0, 0, getmaxx(), getmaxy());

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "This is page #1:");

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

setactivepage(0);

outtextxy(x, y, "This is page #0.");

outtextxy(x, y+ht, "Press any key to view page #1:");

getch();

setvisualpage(1);

getch();

closegraph();

return 0;

}