MFC, Subclassing a window in another application?

Subclassing a window in another application?

Author	Message
Niraj Sha #1 / 4	Subclassing a window in another application? Is it possible to subclass a window in another application. I want to know the string in a edit box in another application. What is the best method to do this. Thanks in advance. Niraj Shah remove to x- to send me email
Fri, 05 Apr 2002 03:00:00 GMT

Chris Beck #2 / 4	Subclassing a window in another application? Quote: > Is it possible to subclass a window in another application. Yes, but you will need to write a hook dll, or use some other method) to ineject a dll containing your subclass code into that process. Quote: >I want to know the string in a edit box in another application. How about sending it a WM_GETTEXT message? The system automatically marshals the standard window messages accross process boundries, so you can send a WM_GETTEXT to any window in the system sure in the knowledge that it will work. Quote: >What is the best method to do this. WM_GETTEXT over subclassing any day. :) Chris -- Please keep newsgroup correspondence within the newsgroups. <http://www.mvps.org/vcfaq> Visual C & Win32 FAQ <http://users.lia.net/chris/win32> My Win32 Development Page
Fri, 05 Apr 2002 03:00:00 GMT

Niraj Sha #3 / 4	Subclassing a window in another application? I did that and I have a polling kind of solution by getting the windowtext. It would be nice to be keyed (onselchange) when somebody changes that edit control. Is subclassing not possible across processes? Thanks for the info, Niraj Quote: >> Is it possible to subclass a window in another application. >Yes, but you will need to write a hook dll, or use some other method) to >ineject a dll containing your subclass code into that process. >>I want to know the string in a edit box in another application. >How about sending it a WM_GETTEXT message? The system automatically marshals >the standard window messages accross process boundries, so you can send a >WM_GETTEXT to any window in the system sure in the knowledge that it will >work. >>What is the best method to do this. >WM_GETTEXT over subclassing any day. :) >Chris >-- >Please keep newsgroup correspondence within the newsgroups. ><http://www.mvps.org/vcfaq> Visual C & Win32 FAQ ><http://users.lia.net/chris/win32> My Win32 Development Page
Fri, 05 Apr 2002 03:00:00 GMT

Tomas Restrep #4 / 4	Subclassing a window in another application? Niraj, Quote: > I did that and I have a polling kind of solution by getting the windowtext. > It would be nice to be keyed (onselchange) when somebody changes that edit > control. Is subclassing not possible across processes? Yes it is, but as Chris already mentioned, you need to inject some code into the other process' address space. This is because the replacement WndProc() needs to be in the context of the process that owns the window. One simple way to inject your code into the other process is to use a hook, like WH_GETMESSAGE or whatever suits you best. -- Tomas Restrepo http://members.xoom.com/trestrep/
Fri, 05 Apr 2002 03:00:00 GMT

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