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Learn how to resolve the PyQt5 dialog application crashes with exit code `-1073740791`. Discover the reasons behind the error and effective solutions to improve your GUI application.
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This video is based on the question https://stackoverflow.com/q/63576066/ asked by the user 'b_dani' ( https://stackoverflow.com/u/14162552/ ) and on the answer https://stackoverflow.com/a/63577493/ provided by the user 'musicamante' ( https://stackoverflow.com/u/2001654/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing PyQt5 Dialog Crashes: Understanding Exit Code -1073740791

Creating a graphical user interface (GUI) application using PyQt5 can be a rewarding experience. However, things can take a turn when your application crashes unexpectedly, leaving you puzzled as you see an exit code of -1073740791. In this guide, we’ll explore the reasons behind this issue and provide clear solutions to fix it.

The Problem: Exit Code -1073740791

You may encounter this exit code when trying to implement a simple PyQt5 dialog application. The issue arises from attempting to access a class attribute incorrectly. Let’s break this down with an example:

[[See Video to Reveal this Text or Code Snippet]]

Here, it seems like you're trying to set the text of a label in your dialog using an attribute that belongs to the class My_Window. However, this line of code is problematic because mid_label_nexttext is an instance variable, and you’ve tried to access it as if it were a class variable.

Why Did This Happen?

Class vs. Instance Variables

In Python, class variables belong to the class itself, while instance variables are tied to specific instances of that class. When you tried to access mid_label_nexttext using My_Window.mid_label_nexttext, it caused the application to crash, generating the exit code. To resolve this, you need to correctly reference instance variables.

The Solution: Correctly Set Text in Your Dialog

There are two main approaches you can use to fix this issue:

1. Pass the Text as an Initialization Argument

This method involves modifying the dialog class to accept a parameter for the text that you want to display. Here’s how:

[[See Video to Reveal this Text or Code Snippet]]

Advantages:

This allows for modular code, making it easier to update the dialog without changing multiple references throughout your application.

2. Set the Text from the Parent

If you prefer not to modify the dialog’s constructor, you can set the text directly from the main window:

[[See Video to Reveal this Text or Code Snippet]]

Note: This approach is generally less modular, as it requires you to manage the dialog's state directly from the parent class.

Additional Tips for Stability

Redundant Calls: The call to self.update() in your original code is unnecessary. If you want to update the label when the spinbox value changes, consider either directly accessing the label or using signals.

Simplifying Lambda Functions: If you're using the same argument parameter, you can connect to the function directly without using a lambda.

Conclusion

Navigating PyQt5 can come with its challenges, but understanding how to properly access instance variables can prevent crashes like the one indicated by exit code -1073740791. By following the above solutions, you should be able to create a more stable and functional dialog application.

Feel free to experiment with both methods to see which works best for your project needs! Happy coding!