_graphfreemem

基本介紹

• 中文名：_graphfreemem
• 功 能:：可修改的圖形存儲區釋放函式
• 用 法:：void far _graphfreemem
• 程式例：#include <graphics.h>

基本信息

函式名: _graphfreemem

功 能: 用戶可修改的圖形存儲區釋放函式

用 法: void far _graphfreemem(void far *ptr, unsigned size);

程式舉例

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#include <alloc.h>

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

/* clear the text screen */

clrscr();

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

getch();

clrscr();

/* 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;

/* display a message */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(midx, midy, "Press any key to exit graphics mode:");

/* clean up */

getch();

closegraph();

return 0;

}

/* called by the graphics kernel to allocate memory */

void far * far _graphgetmem(unsigned size)