Re: IPC, using Application->OnMessage

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Article #1140

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#1140

From: Bob Gonder
Date: Sun, 28 Oct 2007 17:26

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Marc wrote:

>I try to implement IPC between my two processes.

>I use HWND_BROADCAST because in future the sender and receiver will be in 
>two separate processes.

If in the future they will be on different computers, this won't work.

>If I run the application like this and press the button, I receive one 
>OutputDebugString. This is what I expected.
>
>But when I create a second form, and place a TTimer component on it, I 
>receive the OutputDebugString twice.

Every top-level window (form) gets the message.

>Is not the "Handled=true" statement supposed to prevent the message from 
>being sent to another Window ?

No.
It is a BROADCAST just like radio or TV.
Your watching it doesn't stop others from viewing it too.
Every running (windowed) application on your machine will get your spam.

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: IPC, using Application->OnMessage
Date: Sun, 28 Oct 2007 10:26:55 -0700
Organization: MindSpring Enterprises, Inc.
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