ScreenToClient失败解决方法

ScreenToClient失败
代码如下：

void CMyView::OnRButtonDown(UINT nFlags, CPoint point) 

{

	// TODO: Add your message handler code here and/or call default

	//MessageBox("鼠标右键点击!");

	CMenu RMenu,*pSubMenu;

	LPPOINT PPoint=new POINT;

	//GetCursorPos(PPoint);

	ScreenToClient(PPoint);

	RMenu.LoadMenu(IDR_MAINFRAME);

	pSubMenu=RMenu.GetSubMenu(0);

	pSubMenu->TrackPopupMenu(TPM_LEFTALIGN,PPoint->x,PPoint->y,this); 

	delete PPoint;

	CView::OnRButtonDown(nFlags, point);

}

坐标转换之后还是在屏幕的左上角阿！
GetCursorPos(PPoint);用这个函数就可以！

------解决方案--------------------
void CMyView::OnRButtonDown(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    //MessageBox("鼠标右键点击!");
    CMenu RMenu,*pSubMenu;
    //LPPOINT PPoint=new POINT;
    //GetCursorPos(PPoint);
    //ScreenToClient(PPoint); // 这之前要先给PPoint初始化，指定一个点

    ClientToScreen(&point);
    RMenu.LoadMenu(IDR_MAINFRAME);
    pSubMenu=RMenu.GetSubMenu(0);
    pSubMenu->TrackPopupMenu(TPM_LEFTALIGN,point.x,point.y,this); 
    delete PPoint;
    CView::OnRButtonDown(nFlags, point);
}