函数名: graphresult 
 功  能: 返回最后一次不成功的图形操作的错误代码 
 用  法: #include <graphics.h> 
         int far graphresult(void); 
 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; 
   /* 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 */ 
    } 
   /* draw a line */ 
    line(0, 0, getmaxx(), getmaxy()); 
   /* clean up */ 
    getch(); 
    closegraph(); 
    return 0; 
 }