149.屏幕检测程序

#include <stdio.h>
#include <dos.h>
#include <graphics.h>
#include <conio.h>
#include <stdlib.h>
#define INTR 0x1c
void interrupt ( *oldhandler) ();
int fre[]={523,659,587,659,587,494,587,523,440,440,440,330,392,440,494,494,330,415,494,523,523,523};
void interrupt handler(){
  unsigned i;
  static int flag;
  static int k=0;
  union{
    long divisor;
    unsigned char c[2];
  }music;
  unsigned char port;
  flag++;
  if (flag>=4){
    flag=0;
    music.divisor=1190000/fre[k];
    outportb(67,182);
    outportb(66,music.c[0]);
    outportb(66,music.c[1]);
    port=inportb(97);
    outport(97,port|3);
    k++;
    if(k>=22) k=1;
  }
  oldhandler();
}
int main(void)
{
  int gdriver=9,gmode=2,errorcode;
  int midx,midy,i;
  oldhandler=getvect(INTR);
  setvect(INTR,handler);
  /*registerbgidriver( EGAVGA_driver );*/
  initgraph(&gdriver,&gmode,"c:\\tc");
  errorcode=graphresult();
  if(errorcode!=grOk)
  {
    printf("graphic error:%s\n",grapherrormsg(errorcode));
    printf("press any key to halt");
    getch();
    exit(1);
  }
  midx=getmaxx()/2;
  midy=getmaxy()/2;
  for(i=SOLID_FILL;i<USER_FILL;i++)
  {
    setfillstyle(i,getmaxcolor());
    bar(midx-50,midy-50,midx+50,midy+50);
    delay(2000);
    getch();
  }
  getch();
  closegraph();
  setvect(INTR,oldhandler);
  nosound();
  return(0);
}