控制方向键盘

HBITMAP girl[4],bg;
HDC hdc,mdc,bufdc;
HWND hWnd;
DWORD tPre,tNow=0;
int num,dir,x,y;

void GemeCycle();
void MyPaint(HDC hdc);

::ZeroMemory(&msg,sizeof(msg)); //指定的内存块清零。使用结构前清零,而不让结构的成员数值具有不确定性
// 主消息循环:
while (msg.message!=WM_QUIT/*GetMessage(&msg, NULL, 0, 0)*/)
{
  //if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
  if(::PeekMessageA(&msg,NULL,0,0,PM_REMOVE))
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
  }
  else
  {
   if (tPre-tNow>0)
   {
    GemeCycle();
   }
  }

hdc=GetDC(hWnd);
mdc=CreateCompatibleDC(hdc);
bufdc=CreateCompatibleDC(hdc);

bmp=CreateCompatibleBitmap(hdc,640,480);
SelectObject(mdc,bmp);

   x=300;
   y=250;
   dir=0;
   num=0;

   girl[0]=(HBITMAP)LoadImage(NULL,"0.bmp",IMAGE_BITMAP,120,91,
    LR_LOADFROMFILE);
   girl[1]=(HBITMAP)LoadImage(NULL,"1.bmp",IMAGE_BITMAP,120,91,
    LR_LOADFROMFILE);
   girl[2]=(HBITMAP)LoadImage(NULL,"2.bmp",IMAGE_BITMAP,120,91,
    LR_LOADFROMFILE);
   girl[3]=(HBITMAP)LoadImage(NULL,"3.bmp",IMAGE_BITMAP,120,91,
    LR_LOADFROMFILE);
   bg=(HBITMAP)LoadImage(NULL,"bg.bmp",IMAGE_BITMAP,640,480,LR_LOADFROMFILE);

   MyPaint(hdc);

case WM_KEYDOWN:
  switch(wParam)
  {
  case VK_UP:
   switch(dir)
   {
   case 0:
    y-=10;
    break;
   case 1:
    y-=1;
    y-=8;
    break;
   case 2:
    x+=2;
    y-=10;
    break;
   case 3:
    x+=2;
    y-=10;
    break;
   }
   if(y<0)
    y=0;
   dir=0;
   break;
  case VK_DOWN:
   switch(dir)
   {
   case 0:
    x+=1;
    y+=8;
    break;
   case 1:
    y+=10;
    break;
   case 2:
    x+=3;
    y+=6;
    break;
   case 3:
    x+=3;
    y+=6;
    break;
   }
   if(y>375)
    y=375;
   dir=1;
   break;
  case VK_LEFT:
   switch(dir)
   {
   case 0:
    x-=12;
    break;
   case 1:
    x-=13;
    y+=4;
    break;
   case 2:
    x-=10;
    break;
   case 3:
    x-=10;
    break;
   }
   if(x<10)
    x=0;
   dir=2;
   break;
  case VK_RIGHT:
   switch(dir)
   {
   case 0:
    x+=8;
    break;
   case 1:
    x+=7;
    y+=4;
    break;
   case 2:
    x+=10;
    break;
   case 3:
    x+=10;
    break;
   }
   if(x>575)
    x=575;
   dir=3;
   break;
  }
  break;
case WM_DESTROY:
  int i;

  DeleteDC(mdc);
  DeleteDC(bufdc);
  for(i=0;i<4;i++)
   DeleteObject(girl[i]);
  DeleteObject(bg);
  //ReleaseDC(hWnd,hdc);

  PostQuitMessage(0);
  break;
default:
  return DefWindowProc(hWnd, message, wParam, lParam);
}

void MyPaint(HDC hdc)
{
int w,h;

SelectObject(bufdc,bg);
BitBlt(mdc,0,0,640,480,bufdc,0,0,SRCCOPY);

SelectObject(bufdc,girl[dir]);
switch(dir)
{
case 0:
  w=60;
  h=74;
  break;
case 1:
  w=60;
  h=91;
  break;
case 2:
  w=60;
  h=91;
  break;
case 3:
  w=60;
  h=91;
  break;
}

BitBlt(mdc,x,y,w,h,bufdc,60,0,SRCAND);
BitBlt(mdc,x,y,w,h,bufdc,num*w,0,SRCPAINT);
BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);

tPre=GetTickCount();

num++;
if(num==8)
num=0;
}

void GemeCycle()
{
int w,h;

SelectObject(bufdc,bg);
BitBlt(mdc,0,0,640,480,bufdc,0,0,SRCCOPY);

SelectObject(bufdc,girl[dir]);
switch(dir)
{
case 0:
  w=60;
  h=74;
  break;
case 1:
  w=60;
  h=91;
  break;
case 2:
  w=60;
  h=91;
  break;
case 3:
  w=60;
  h=91;
  break;
}

BitBlt(mdc,x,y,w,h,bufdc,60,0,SRCAND);
BitBlt(mdc,x,y,w,h,bufdc,0,0,SRCPAINT);
BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);

//tPre=GetTickCount();
tNow =tPre+400;
num++;
if(num==8)
num=0;
}