函数名: setrgbpalette 
 功  能: 定义IBM8514图形卡的颜色 
 用  法: #include <graphics.h> 
         void far setrgbpalette(int colornum, int red, int green, int blue); 
 程序例: 
#include <graphics.h> 
 #include <stdlib.h> 
 #include <stdio.h> 
 #include <conio.h> 
int main(void) 
 { 
    /* select a driver and mode that supports the use */ 
    /* of the setrgbpalette function.                 */ 
    int gdriver = VGA, gmode = VGAHI, errorcode; 
    struct palettetype pal; 
    int i, ht, y, xmax; 
   /* 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 */ 
    } 
   /* grab a copy of the palette */ 
    getpalette(&pal); 
   /* create gray scale */ 
    for (i=0; i<pal.size; i++) 
       setrgbpalette(pal.colors[i], i*4, i*4, i*4); 
   /* display the gray scale */ 
    ht = getmaxy() / 16; 
    xmax = getmaxx(); 
    y = 0; 
    for (i=0; i<pal.size; i++) 
    { 
       setfillstyle(SOLID_FILL, i); 
       bar(0, y, xmax, y+ht); 
       y += ht; 
    } 
   /* clean up */ 
    getch(); 
    closegraph(); 
    return 0; 
 }