I am new to Qt and am writing a program on Windows, using Visual Studio Community 2015 and the Qt Designer plugin.

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I think only the main thread has access to the UI in Qt. Thus if you want GUI functionality, it must be there, and can be only signaled from other.

One of the things this program does is create a background thread to monitor some external hardware. I used the WINAPI CreateThread for this, not a Qthread, because a prior version of the program was not GUI based, and I'd rather avoid rewriting anything I don't have to.

I want the main GUI window to update when the external hardware state changes, which may be rarely, or several times per second.

I understand that it is unsafe to update the Qt GUI from worker threads, and that the main GUI thread should be signaled to do this work itself. This is the method that I am using. It works, but I want to

1. confirm that it is indeed safe
2. ask if there is a better/cleaner way to do it

Stripped down to its bones, this is my method:

In my main QMainWindow class, I've added a function to do the actual GUI update

my_prog_pointer is ultimately passed as a parameter to the worker thread, so that thread will know who to notify when GUI work has to be done.

The GUI update function is something like:

And from the other thread, when I want to update the GUI, I call

And it works.

Is this method safe? If so, is there a reason (performance, style, whatever) to do it differently?

Thank you.

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