TreeCtrl Navigating all items programatically

[Vikash Dubey 0]

;PHello all, I am using CTreeCtrl and when creating items and I am storing a LPSTR into the lParam of the TVITEM struct. When I need to clear the contents I need to free the memory allocated but to get the pointers I need to traverse all items in the tree ctrl but could not find any easy way to do it. Can anyone guide me? Will the method that i write be recursive or can i write a non recursive function? I need to get each item data in the tree and then free the memory and then I can call DeleteAllItems on the tree. Thank you Memory Leaks are very dangerous.;P

[Michael Dunn]

It's nowhere near as complicated as that. Handle the TVN_DELETEITEM notification to know when an item is being deleted. --Mike-- Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber Pinky, are you pondering what I'm pondering? I think so Brain, but how will we fit the hamster inside the accordion?

[Prakash Nadar]

Micheal, If the treeitem contains child notes that has allocated memory for lparam, will i get notification for each childitem when i delete its parent item. My God is more powerfull Than Your God. (the line that divides the world)

[Vikash Dubey 0]

Thank you very much Mike works very well. I have read your articles on this site and find them very good. I admire you. Thanks once again. But one more question I am using a ActiveX control and allocating it on the heap. I create it by calling Create(). When i free the memory the GDI object handles and USER object shown in process viewer decreases but not to the count it was before I do the creation operation If i try to call DestroyWindow() it gives assertion error. Why is it so? What should i do to decrease the GDI object and USER object count as it increases with usage time.

[Michael Dunn]

Yes, you get a notification for every item that gets deleted from the tree. --Mike-- Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber Kosh reminded me of some of the prima-donna programmers I've worked with. Knew everything but when you asked them a question; never gave you a straight answer.   -- Michael P. Butler in the Lounge

[Michael Dunn]

The most common mistake is forgetting to select pens/bitmaps/etc. out of a device context. For ex. if you do this (pseudo-MFC code here, since I'm in a hurry ;) )

CPen p (RGB(255,0,0));

dc.SelectObject(p);
dc.MoveTo(0,0);
dc.LineTo(100,100);

p.DeleteObject();

the pen will not be deleted because it's still the active pen in a DC. --Mike-- Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber You cannot truly appreciate Dilbert unless you've read it in the original Klingon.

[Prakash Nadar]

Wow, Thanx again micheal, this method replaced my (quite complex) recurrsive way of deleteing the child items :-) My God is more powerfull Than Your God. (the line that divides the world)