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8.5

How can I get VirtualTreeview data or text from an external application?

Asked by Today77 in Delphi Programming, Windows Programming

Tags: VirtualTreeview, Delphi, external, code injection, dll

Hi Experts!

There is an external application with a VirtualTreeview / TVirtualStringTree descandant (original component: http://www.soft-gems.net/index.php , http://code.google.com/p/virtual-treeview/ ) on it. I haven't got the source code.
This application can load custom dlls, so I can run my code inside the application.
I'd like to get the VirtualTreeview data, but I don't know the data structure, so I think the only solution is to get these data is calling the procedure of the OnGetText event as the application do this when it shows the cell's value.
With the help of FindWindow and EnumChildWindows functions I get the TreeView Handle, and after this I convert it to TWinControl. At this point everything is ok, I can get the control's properties. But when I try to call the OnGetText's procedure I get an error (Access Violation). The result is the same when I try to call the SaveToFile procedure.
The decompiled dfm contains the OnGetText event, but when I check it at runtime it seems not exists (Assigned(OnGetText) is false). What may be its reason?
An other solution may be to create a dll and inject to the application. I don't know there are differences between the first and second possibility (app loads a dll or I inject it) from the viewpoint of the access of components and procedures.
Do you know any other solution to access the text? For example message hooking?

Thanks for your help in advance!
[+][-]08/27/09 01:03 AM, ID: 25195563Accepted Solution

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Zones: Delphi Programming, Windows Programming
Tags: VirtualTreeview, Delphi, external, code injection, dll
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Solution Provided By: MvanderKooij
Participating Experts: 3
Solution Grade: A
 
[+][-]08/22/09 09:32 AM, ID: 25159240Expert Comment

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