多显示器环境中移动窗口到指定的显示器

//显示器信息结构体
typedef struct _tagMyMonitorInfo_t
{
  HMONITOR hMonitor;
  MONITORINFOEX info;

  _tagMyMonitorInfo_t()
  {
    ZeroMemory(this, sizeof(*this));
  }
}MYMONITORINFO, *LPMYMONITORINFO;
CArray <MYMONITORINFO> m_MyMonitorInfo;

//EnumDisplayMonitors 回调函数
BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor,
                              LPRECT lprcMonitor, LPARAM dwData)
{
  MYMONITORINFO mInfo;
  mInfo.hMonitor = hMonitor;
  mInfo.info.cbSize = sizeof(mInfo.info);
  GetMonitorInfo(hMonitor, &mInfo.info);
  m_MyMonitorInfo.Add(mInfo);
  
  return TRUE;
}

int MoveWindow2Monitor(
  int iMonitorIndex, //显示器索引0,1,2,etc
  HWND hWnd, //窗口指针
  int x=0, int y=0, //窗口左上角坐标偏移
  int cx=0, int cy=0 //窗口尺寸 (0时不改变)
  )
{
  int iRet = 0;

  do
  { 
    //窗口句柄有效？
    if(!IsWindow(hWnd))
    {
      TRACE(_T("Invalid window handle\n"));
      iRet = -1;
      break;
    }

    //枚举显示器
    m_MyMonitorInfo.RemoveAll();
    if(!EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, NULL))
    {
      TRACE(_T("EnumDisplayMonitors failed %u\n"), GetLastError());
      iRet = -2;
      break;
    }

    //显示器索引是否正常？
    if(iMonitorIndex >= /*GetSystemMetrics(SM_CMONITORS)*/
       m_MyMonitorInfo.GetSize())
    {
      TRACE(_T("Out of Monitor ranges\n"));
      iRet = -3;
      break;
    }

    //工作区域坐标 
    RECT rcWork = m_MyMonitorInfo[iMonitorIndex].info.rcWork;

    //左上角坐标
    x += rcWork.left;
    y += rcWork.top;
    //尺寸
    RECT rcWnd;
    GetWindowRect(hWnd, &rcWnd);
    if(cx == 0)
      cx = rcWnd.right - rcWnd.left;
    if(cy == 0)
      cy = rcWnd.bottom - rcWnd.top;

    //位置限制
    {      
    }
    
    //移动窗口
    if(!SetWindowPos(hWnd, NULL, x, y, cx, cy, 
      SWP_FRAMECHANGED|SWP_NOZORDER))
    {
      TRACE(_T("SetWindowPos failed %u"), GetLastError());
      iRet = -4;
      break;
    }

    iRet = TRUE;
  }while(0);

  return iRet;
}

//测试函数

void CDlg2Dlg::OnButton1() 
{
  // TODO: Add your control notification handler code here
  //移动窗口到第二个显示器上
  MoveWindow2Monitor(1, m_hWnd);

}