学步园

代码很简单，需要注意的是：最顶层的窗口，需要具备没有父窗口，我这里根据需要加上了判断WS_VISIBLE属性。

HWND hGetProcessWnd(DWORD dwProcessId)
{
       HWND   hRetWnd = NULL;
       DWORD dwEnumProcessID;

       HWND   hChildWnd = GetTopWindow(NULL);
       while(hChildWnd)
       {
              ::GetWindowThreadProcessId(hChildWnd, &dwEnumProcessID);
              if(dwProcessId == dwEnumProcessID)
              {
                     LONG lStyle = ::GetWindowLong(hChildWnd, GWL_STYLE);
                     if((lStyle & WS_VISIBLE) && (GetParent(hChildWnd)==NULL))
                     {
                            hRetWnd = hChildWnd;
                            break;

                     }
              }

              hChildWnd = GetWindow(hChildWnd, GW_HWNDNEXT);
       }

       return hRetWnd;
}