Docking Pane - invalid pane on XTP_DPN

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invalid pane on XTP_DPN_PANEMENUCLICK

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Category: Codejock Products
Forum Name: Docking Pane
Forum Description: Topics Related to Codejock Docking Pane
URL: https://forum.codejock.com/forum_posts.asp?TID=3426
Printed Date: 15 November 2026 at 7:44am
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Topic: invalid pane on XTP_DPN_PANEMENUCLICK

Posted By: andolo
Subject: invalid pane on XTP_DPN_PANEMENUCLICK
Date Posted: 20 December 2005 at 7:48am

Hi,
i need yor help please:

I want to handle XTP_DPN_PANEMENUCLICK. But when the lParam in this case doesn't point to a valid CXTPDockingPane.
What is wrong or how can i get the pane who sends the message?

LRESULT CMainFrame::OnDockingPaneNotify(WPARAM wParam, LPARAM lParam)
{
     CXTPDockingPane* pPane = (CXTPDockingPane*)lParam;

    switch ((int)wParam)
    {
       case XTP_DPN_SHOWWINDOW:
          // here pPane is valid

          break;

       case XTP_DPN_PANEMENUCLICK:
          // here pPane is invalid

break;
}
}

Replies:

Posted By: Oleg
Date Posted: 20 December 2005 at 1:31pm

because lParam is XTP_DOCKINGPANE_CLICK pointer.

XTP_DOCKINGPANE_CLICK* pClick = (XTP_DOCKINGPANE_CLICK*)lParam;

lParam depends on wParam value.

move CXTPDockingPane* pPane = (CXTPDockingPane*)lParam; to scope of case XTP_DPN_SHOWWINDOW.

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: andolo
Date Posted: 21 December 2005 at 2:29am

Thanks, that helps! But i could not find it in the documentation. Is there any description for these parameters?

Posted By: Oleg
Date Posted: 21 December 2005 at 2:44am

Yes, sorry was not documented :(

Use it as:

XTP_DOCKINGPANE_CLICK* pClick = (XTP_DOCKINGPANE_CLICK*)lParam;

CXTPDockingPane* pPane = pClick->pPane.

ps. structure declaration

struct XTP_DOCKINGPANE_CLICK
{
CXTPDockingPane* pPane;
CPoint pt;
CRect rcExclude;
};

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS