改变内部图形缓冲区的大小

[c]代码库

#include <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

#define BUFSIZE 1000 /* internal graphics buffer size */ 

int main(void) 
{ 
   /* request auto detection */ 
   int gdriver = DETECT, gmode, errorcode; 
   int x, y, oldsize; 
   char msg[80]; 

   /* set the size of the internal graphics buffer */ 
   /* before making a call to initgraph.           */ 
   oldsize = setgraphbufsize(BUFSIZE); 

   /* 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 */ 
   } 

   x = getmaxx() / 2; 
   y = getmaxy() / 2; 

   /* output some messages */ 
   sprintf(msg, "Graphics buffer size: %d", BUFSIZE); 
   settextjustify(CENTER_TEXT, CENTER_TEXT); 
   outtextxy(x, y, msg); 
   sprintf(msg, "Old graphics buffer size: %d", oldsize); 
   outtextxy(x, y+textheight("W"), msg); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
}