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Qthread slot example

Nov 04,  · Here's one example of how to use QThread correctly, but it has some issues with it, which are reflected in the comments. In particular, since the order in which the slots are executed isn't strictly defined, it could lead to various problems. The comment posted on August 6, gives a nice idea how to deal with this issue. QThreads general usage. The main thing in this example to keep in mind when using a QThread is that You set up the proper signal/slot connections to. Jan 24,  · How To Really, Truly Use QThreads; I am using your example for using QThread. the problem I am facing is so the slots and signals of the QThread.

"How to use QThread in the right way (Part 1)"

This will cause the thread to be deleted only after it has fully shut down. I was asked on IRC a question from an user who followed that example in order to run some simple code in a thread. Very interesting, isn't it? Both of them are bad uasge?! When the thread starts executing, we setup a QTimer thats going to run in the current thread's event queue.

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PySide Signals and Slots with QThread example

You were not doing so wrong. This post is about the use of QThread. It is an answer to a three years old blog post by Brad, my colleague at the time: In his blog post , Brad explains that he saw many users misusing QThread by sub-classing it, adding some slots to that subclass and doing something like this in the constructor: As Brad mentions, it is wrong: So it is supposed to be used from the creating thread. Slots in the QThread object are then not run in that thread and having slots in a subclass of QThread is a bad practice.

But then Brad continues and discourages any sub-classing of QThread at all. He claims it is against proper object-oriented design. This is where I disagree. Putting code in run is a valid object-oriented way to extend a QThread: A QThread represents a thread that just starts an event loop, a subclass represents a thread that is extended to do what's in run.

After Brad's post, some members of the community went on a crusade against sub-classing QThread. The problem is that there are many perfectly valid reasons to subclass QThread. Look at the first code sample of the Qt 4. It has many lines of boiler plate just to run some code in a thread. And the there is even a leak: I was asked on IRC a question from an user who followed that example in order to run some simple code in a thread. He had a hard time to figure out how to properly destroy the thread.

That is what motivated me to write this blog entry. If you allow to subclass QThread, this is what you got:

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Login Introduction In some applications it is often necessary to perform long-running tasks, such as computations or network operations, that cannot be broken up into smaller pieces and processed alongside normal application events.

In such cases, we would like to be able to perform these tasks in a way that does not interfere with the normal running of the application, and ensure that the user interface continues to be updated. One way of achieving this is to perform these tasks in a separate thread to the main user interface thread, and only interact with it when we have results we need to display.

This example shows how to create a separate thread to perform a task - in this case, drawing stars for a picture - while continuing to run the main user interface thread. The worker thread draws each star onto its own individual image, and it passes each image back to the example's window which resides in the main application thread. The User Interface We begin by importing the modules we require.

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We need the math and random modules to help us draw stars. We create a single Worker instance that we can reuse as required. The user interface consists of a label, spin box and a push button that the user interacts with to configure the number of stars that the thread wil draw.

The output from the thread is presented in a QLabel instance, viewer. This will reset the user interface when the thread stops running. We place each of the widgets into a grid layout and set the window's title: Since the start button is the only widget that can cause this slot to be invoked, we simply disable it before starting the thread, avoiding problems with re-entrancy. Whenever is star is drawn by the worker thread, it will emit a signal that is connected to the addImage slot. This slot is called with a QRect value, indicating where the star should be placed in the pixmap held by the viewer label, and an image of the star itself: The updateUi slot is called when a thread stops running.

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