QObject: Cannot create children for a parent that is in a different thread
文章目录
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- Cause
- Example Scenario
- Solutions
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- 1. Create `QObject` in the Same Thread as the Parent
- 2. Move the Parent Object to the Child’s Thread
- 3. Use Signals and Slots for Thread Communication
- Conclusion
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The error message “QObject: Cannot create children for a parent that is in a different thread” in Qt C++ typically occurs when a
QObject is being created or manipulated in a thread that is different from its parent’s thread. In Qt, all
QObject instances must be created and managed within the same thread as their parent. This rule is enforced by the Qt object hierarchy and thread affinity system.
Here’s a detailed explanation of the cause and how to resolve this issue:
Cause
In Qt, each QObject has a thread affinity, meaning it is associated with the thread in which it was created. When you attempt to create or assign a QObject as a child of a p