以下程序是想在一个窗口中显示一个字符串Hellow world，然后再在这个窗口中计算出此窗口在屏幕坐标系中的坐标。但是运行结果却只显示了Hellow world。不知道哪儿错了？

LRESULT CALLBACK WndProc(HWND hwnd,UINT message, WPARAM wparam, LPARAM lparam)
    {HDC hDC1,hDC2;
     PAINTSTRUCT ps1,ps2;
     RECT rect1,rect2;
     char sname[]="Hellow world.",str[35];
       int size=strlen(sname);
  int x1,x2,y1,y2,len;
   switch(message)
  {case WM_PAINT:hDC1=BeginPaint(hwnd,&ps1);
                    GetClientRect(hwnd,(LPRECT)&rect1);
                    SetTextAlign(hDC1,TA_CENTER);
     TextOut(hDC1,rect1.right/2,rect1.bottom/2,sname,size);
     EndPaint(hwnd,&ps1);

hDC2=BeginPaint(hwnd,&ps2);
GetClientRect(hwnd,(LPRECT)&rect1);
GetWindowRect(hwnd,&rect2);
x1=rect2.right,y1=rect2.top,x2=rect2.right,y2=rect2.bottom;
sprintf(str,"x1=%d,y1=%d,x2=%d,y2=%d,len=%d",x1,y1,x2,y2,strlen(str));       
len=strlen(str);
TextOut(hDC2,rect1.right/2,rect1.bottom/2+17,str,len);     
  EndPaint(hwnd,&ps2);break;


case WM_DESTROY:PostQuitMessage(0);
   default:  return (DefWindowProc(hwnd,message,wparam,lparam));}
   return 0;}