CODEWITHSUNDEEP
delphiwinapiwindows-messages
Pateman
Pateman

Reputation: 2757

Passing message to another window

I would like to write an application which passes every message it receives to another window. For example, I have an application where user can press some keys, move mouse over it, etc. and I want all these messages passed to, for example, MS Paint.

How do I do this? Any ideas? As far as I know, there may be a problem with sending key strokes to another window, so please advice as well.

EDIT

Okay, maybe I will give you more description of what I'm looking for.

My applications displays a window of another application on the form. Now I would like to control the other window using messages sent to my application's form (like key downs, mouse moves, etc.).

I have been thinking of passing all the messages my form receives to the window of the application I'm kind of 'embedding' into my own. By 'embedding' I mean making the application window display on my form.

Maybe there's another solution to my problem. Please advice.

Thank you for your time.

Upvotes: 0

Views: 1198

Answers (3)

David Heffernan
David Heffernan

Reputation: 612804

Some messages (i.e. input messages) arrive through the message queue and the rest are delivered straight to the recipient windows. What you are asking to do therefore requires you to do all of the following:

  1. Implement a top level message loop that retrieves messages from the queue and sends them to the other app.
  2. Reimplement all modal window loops to pass all messages on.
  3. Replace the window procedure for all windows in your process with one that passes all messages on to the other app.
  4. Look for other opportunities for messages to arrive that I have not covered.

I can't imagine that this is really going to be the solution to your problem, whatever that problem is.

Upvotes: 4

Jerry Gagnon
Jerry Gagnon

Reputation: 1161

Override the form's DefaultHandler() and post every message it gets to the other form. If there are any explicit message handlers in the form or even some controls then you may not see those messages in DefaultHandler().

Upvotes: 1

Mike Kwan
Mike Kwan

Reputation: 24447

Forwarding the messages is definitely possible and easy, but it likely won't do what you are expecting. Take a look here.

Upvotes: 1

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