函数名: getdrivername 
 功  能: 返回指向包含当前图形驱动程序名字的字符串指针 
 用  法: #include <graphics.h> 
         char *getdrivename(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; 
/* stores the device driver name */ 
    char *drivername; 
/* initialize graphics and local variables */ 
    initgraph(&gdriver, &gmode, ""); 
/* read result of initialization */ 
    errorcode = graphresult(); 
 /* an error occurred */ 
    if (errorcode != grOk) 
    { 
       printf("Graphics error: %s\n", 
               grapherrormsg(errorcode)); 
       printf("Press any key to halt:"); 
       getch(); 
 /* terminate with an error code */ 
       exit(1); 
    } 
setcolor(getmaxcolor());
/* get name of the device driver in use */ 
    drivername = getdrivername(); 
/* for centering text on the screen */ 
    settextjustify(CENTER_TEXT, CENTER_TEXT); 
/* output the name of the driver */ 
    outtextxy(getmaxx() / 2, getmaxy() / 2, 
       drivername); 
/* clean up */ 
    getch(); 
    closegraph(); 
    return 0; 
 }