如何获得相对于客户区的坐标

Question

case WM_MOUSEMOVE: 
hdc=GetDC(hwnd);
GetCursorPos(&pt);
sprintf(str,"%d,%d",pt.x,pt.y);    
TextOut(hdc,10,10,str,strlen(str)); 
ReleaseDC(hwnd,hdc);
break;这个鼠标显示的位置是相对桌面左上角的，问下怎么显示设置相对于客户区的坐标？

Answer 1

case WM_MOUSEMOVE: 
hdc=GetDC(hwnd);
GetCursorPos(&pt);
ScreenToClient(&pt); //这里设置.
sprintf(str,"%d,%d",pt.x,pt.y);    
TextOut(hdc,10,10,str,strlen(str)); 
ReleaseDC(hwnd,hdc);
break;其实直接可以直接得出客户区的坐标,像这样
case WM_MOUSEMOVE:
{
 POINT pt;
 pt.x=LOWORD(lParam);
 pt.y=HIWORD(lParam);
 //Ok!Do anything you want.
 }
break;

Answer 2

case WM_MOUSEMOVE: 
hdc=GetDC(hwnd);
GetCursorPos(&pt);
ScreenToClient(hwnd,&pt); //这里设置 相对于客户区的坐标
sprintf(str,"%d,%d",pt.x,pt.y);    
TextOut(hdc,10,10,str,strlen(str)); 
ReleaseDC(hwnd,hdc);
break;  这样是可以的下面一种
case WM_MOUSEMOVE: 
   POINT pt; 
   pt.x=LOWORD(lParam); 
   pt.y=HIWORD(lParam);
   sprintf(str,"%d,%d",pt.x,pt.y);    
   TextOut(hdc,10,10,str,strlen(str)); 
   break;
没有反应呢

Answer 3

ScreenToClient将屏幕坐标转化成客户窗口坐标