- 1 year ago
QProgressDialog::setValue produces random stack overflows
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If you are experiencing random stack overflows when using QProgressDialog::setValue
in your Qt application, it could be due to recursive function calls or a large number of rapid updates to the progress dialog.
Here are a few suggestions to mitigate the issue:
Throttle the updates:
- If you are making frequent calls to
setValue
, consider reducing the frequency of updates. Instead of updating the progress value for every small step, update it less frequently to avoid overwhelming the event loop.
- If you are making frequent calls to
Use a timer or delay:
- Instead of calling
setValue
immediately, introduce a small delay using a timer or a delay mechanism. This delay will help prevent a flood of rapid updates, reducing the risk of stack overflows. - For example, you can use
QTimer::singleShot
to schedule the update with a delay:cppQTimer::singleShot(50, [this, value]() {
progressDialog->setValue(value);
});
- Instead of calling
Check for recursion or excessive function calls:
- Examine your code for any recursive function calls that could lead to a stack overflow. Make sure that there are no circular dependencies or unintentional recursive calls.
- If the progress dialog updates are triggered by a signal or slot mechanism, verify that there are no infinite loops or excessive emissions of the signal triggering the updates.
Optimize your code:
- Review the logic in your code and consider any potential optimizations to reduce the number of updates or improve the efficiency of the progress updates.
- For example, if the progress updates are based on a loop, ensure that the loop is efficiently structured to minimize unnecessary iterations.
By implementing these suggestions, you can help prevent stack overflows when using QProgressDialog::setValue
in your Qt application. Remember to analyze the specific context and requirements of your application to determine the appropriate approach to handle progress updates effectively.