Win32 SDK中Context Menu使用大致流程

1、CreatePopupMenu创建菜单
2、TrackPopupMenu显示菜单，系统会自动发个WM_CONTEXTMENU消息。
3、消息循环中使用WM_CONTEXTMENU处理，其他消息。

Context Menu的应用(if in MFC)直至探出菜单
Abstract:
Windows不认为顶级菜单是Popup Menu!!!!!

Method ONE
///////////////////////////////////////////////////////
Step 1:Edit in the resource editor
Step 2:CMenu::LoadMenu
Step 3:
m_Menu.GetSubMenu(0)->AppendMenu (MF_STRING|MF_POPUP|MF_ENABLED ,11111,"123");
m_Menu.GetSubMenu(0)->AppendMenu (MF_STRING|MF_POPUP|MF_ENABLED ,11112,_T("321"));
Step 4:
void CMenuTestDlg::OnContextMenu(CWnd* pWnd, CPoint point)
{
// TODO: Add your message handler code here

m_Menu.GetSubMenu (0)->TrackPopupMenu (TPM_CENTERALIGN|TPM_RETURNCMD ,point.x , point.y ,this);

}
//////////////////////////////////////////////////////
Method TWO：
Step 1:
CMenu m_Menu.CreateMenu ();
CMenu m_SubMenu.CreateMenu ();
Step 2:
m_SubMenu.AppendMenu (MF_STRING|MF_POPUP|MF_ENABLED ,11111,"Sub1");
m_SubMenu.AppendMenu (MF_STRING|MF_POPUP|MF_ENABLED ,11112,"Sub2");
Step 3:
m_Menu.AppendMenu (MF_POPUP,(UINT)m_SubMenu.m_hMenu ,"mainMenu");
Step 4:
void CMenuTestDlg::OnContextMenu(CWnd* pWnd, CPoint point)
{
// TODO: Add your message handler code here

m_Menu.GetSubMenu (0)->TrackPopupMenu (TPM_CENTERALIGN|TPM_RETURNCMD ,point.x , point.y ,this);

}

上次无法响应Context Menu点击事件的问题
Key words:
TrackPopupMenu, TPM_RETURNCMD

TrackPopupMenu中如果设置了TPM_RETURNCMD,则该函数以返回值形式给出用户所点击Menu Item的ID，且不再另行发送WM_COMMAND消息；若不设置该参数，则发送WM_COMMAND，并以WM_COMMAND消息的参数给出点击菜单项的ID。

MSDN CMenu::TrackPopupMenu 条目未提及此参数

MSDN TrackPopupMenu条目仅给出如下，未提及TPM_RETURNCMD与WM_COMMAND互斥的关系。

VC版本：6.0 professional
MSDN版本：6.0