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  • Question: QPlugin fails to load .so
  • Time: Updated 10 minute ago
  • Modified: Asked 29 minute ago
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QPlugin fails to load .so

QPlugin is a class in the Qt framework that allows dynamic loading of shared object (“.so”) files at runtime. When a shared object fails to load using QPlugin, there can be a number of possible causes.

Here are some possible reasons why a shared object might fail to load using QPlugin:

  1. The shared object is not in the expected location: QPlugin expects shared objects to be located in specific directories. By default, these directories are “/usr/lib” and “/usr/local/lib”. If the shared object is located elsewhere, QPlugin may fail to find it. You can use the QCoreApplication::addLibraryPath() function to add additional directories to the search path.

  2. The shared object is not compatible with the system architecture: Shared objects are compiled for a specific architecture, such as x86 or ARM. If the shared object is compiled for a different architecture than the system it is running on, it will fail to load.

  3. The shared object is missing dependencies: Shared objects can depend on other shared objects. If a dependency is missing or not found, the shared object may fail to load. You can use the ldd command to check the dependencies of a shared object.

  4. The shared object is not a valid Qt plugin: In order to be loaded by QPlugin, a shared object must conform to certain conventions for Qt plugins. Specifically, it must contain a factory function that creates an instance of a QObject-derived class. You can use the Q_EXPORT_PLUGIN2 macro to export a plugin from your shared object.

  5. There is a problem with the permissions on the shared object: If the user running the program does not have permission to read the shared object, it may fail to load. Make sure that the user has the appropriate permissions to read the shared object.

If you’re still having trouble after checking these possible causes, you may need to look into the specific error message or code that QPlugin is returning to determine the underlying issue.

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