🚀 go-pugleaf

Remy Lebeau (TeamB) wrote:
> "Segal" <none@none.spam.sucks.balls> wrote in message
> news:417fdf69$1@newsgroups.borland.com...
>
>> Hello, I can get text (like a caption, or text from a textbox) from a
>> given window of a program outside my program using WINAPI
>> functions, but how does one get items in a Treeview in another
>> program?
>
> You need to first inject your program into the address space of the
> foreign program.  Then you can query the TreeView using the normal
> TreeView API messages.  This is because the messages use pointers,
> and you cannot pass pointers across processes (not safely, anyway).
> To inject your own code into the foreign process, you will have to
> put your code into a DLL and then use SetWindowsHookEx() to install a
> hook into the foreign process.  The hook would be called in the
> context of the foreign process, and the hook would run your code, so
> your code would run in the context of the foreign process. Your hook
> could then send the data back to your main application via
> WM_COPYDATA or other inter-process communications of your choosing.


Thank you very much for replying. I have never done this before, are
there any examples? I've never done a dll before, wel, not one that
communicated with an app I'm writting in BCB. I've been programmign C++
quite a bit, I'm very familiar with it, just never did much with dll and
hooks like this, if you could provide some good examples or so, it would
really help.

>> Also, this same program I'm trying to "hook" pops up little
>> message boxes that I'm trying to intercept and get the text
>> from, but I'm a little stuck on the interception part. Only way
>> I can think of is running a loop or a timer with FindWindow
>> seeing is one of these little windows is present?
>
> A global hook via SetWindowsHookEx() would be more reliable.  Then
> you would get notified when new windows are being created and
> displayed, and then can test the new windows for your criteria and
> extract your text when needed.

I'm not getting how I would get notified? Would I use some sort of call
back function, to make it "event driven" ?

>> I want to be able to know when the foreign Treeview changes
>
> The only way to do that is to subclass the TreeView window, but you
> cannot subclass windows across processes.

So I would have to poll it ever so often?