如何使对话框可拖动改变大小

鼠标放到对话框边缘或拐角时，可以拖动改变窗口的大小

m_pMotorCtrlDlg =new CMotorCtrlDlg;

m_pMotorCtrlDlg->Create(IDD_DIALOG_MOTORCONTROL, this); //this->GetDesktopWindow());       //Create("","", WS_CHILD|WS_VISIBLE, CRect(0,0,0,0),this,0,NULL); //AFX_IDW_PANE_FIRST  (IDD_DIALOG_MOTORCONTROL,this); 

//DWORD dwStyle=m_pMotorCtrlDlg->GetStyle();

//m_pMotorCtrlDlg->ModifyStyle(0, WS_THICKFRAME, 0);

DWORD dwStyle = GetWindowLong(m_pMotorCtrlDlg->m_hWnd,GWL_STYLE); 

dwStyle|=WS_THICKFRAME;  //可拖动窗口大小风格，注意窗口属性必须具有最大化按钮才有效

SetWindowLong(m_pMotorCtrlDlg->m_hWnd,GWL_STYLE,dwStyle);

 

m_pMotorCtrlDlg->ShowWindow(SW_SHOW);