Re: transition to FOX 1.7 FXGUISignal

On Mon, 21 Feb 2022 07:32:48 +0100
Francesco Abbate <[email protected]> wrote:

>Dear all,
>
>I am transitioning some of my applications to FOX 1.7. I stumbled on a
>problem, one of my application is using the class FXGUISignal but this
>latter no longer exists.
>
>For the moment I wasn't able to figure out what should I use instead, I
>would appreciate some help. Also I looked for some documentation to
>transition from Fox 1.6 but I didn't found any information on the website
>neither in the source code.


Use FXMessageChannel. It works better than the old FXGUISignal.

FXMessageChannel is essentially an asynchronous message from a 
thread to the GUI thread [via its event loop system].

In a nutshell:

	1) Create an FXMessageChannel

	   This will create a pipe and [on Windows, a semaphore].

	2) Implement message handler in the object you want to send a message
	   to.

	3) Send a message to this object from a thread:

		messagechannel->message(target,message,data,size);

	4) The target will be called via the FXMessageChannel, when the
	   main GUI loop wakes up [which happens when its pipe has some
	   data [on Windows, when the semaphore is signaled].

	   FXMessageChannel::onMessage will pull the message, its optional
	   data, and dispatch to the target object.

You can pass any data you want, but keep it small: it is passed through the pipe.


Hope this helps,

			-- JVZ


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