How Can PyQt's QThread Solve GUI Freezing During Continuous Data Transmission?

Background Thread Implementation using QThread in PyQt

Your issue stems from performing continuous data transmission, which freezes the PyQt GUI due to the blocking nature of the write loops. While the GUI still responds to events during these loops, processing events through QCoreApplication.processEvents() does not prevent GUI hangs during relatively long transmission sleeps.

Multithreading with QThread

To address this, QThread offers a simple solution for creating background threads that execute tasks separately from the main GUI thread. QThread allows you to start, run, and stop threads, enabling continuous transmission without freezing the GUI.

Example Implementation

Here's a simplified code example demonstrating 3 methods of implementing multithreading with PyQt:

1. Sub-classing QThread: Create a class inheriting QThread and implement the run() method to execute the thread task, in this case, data transmission.
2. Moving QObject to Thread: Create a QObject and move it to a thread using moveToThread(). Signal the thread to quit upon completion of the task.
3. QRunnable: Use QRunnable, an object not derived from QObject, and implement the run() method to encapsulate the thread task. Utilize QThreadPool to manage the thread execution and emit signals to the GUI thread when the task is complete.

By selecting the appropriate method based on your specific requirements, you can establish background threads that handle continuous data transmission without hindering the responsiveness of the PyQt GUI.

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