Why Does My Qt5 App Crash on a Clean Windows PC, and How Can windeployqt Help?

Deploying Qt 5 App on Windows: Troubleshooting Crash

Deploying Qt-based applications on Windows can be challenging, especially when compared to the simplicity of Qt4. While static linking seemed like a potential solution, it has its drawbacks as well. This article explores the issue of Qt5 application crashes on "clean" Windows PCs and provides a comprehensive solution using the windeployqt tool.

windeployqt: A Game-Changer for Qt5 Deployment

Introduced in Qt 5.2, the windeployqt tool simplifies the deployment process for Windows applications. It automatically copies the necessary Qt dependencies to accompany the executable file. To use it, simply run the following command:

windeployqt your_app.exe

Handling QML Dependencies

If your application uses QML, specify the location of your QML files using the --qmldir option:

windeployqt your_app.exe --qmldir your_qml_directory

Thorough Testing

To ensure a complete deployment, it's essential to test your application on a computer without Qt SDK installed. Alternatively, temporarily rename the Qt directory to prevent the application from accessing missing files from there.

Additional Tips

• Verify that you have installed all the necessary Qt modules (Quick/QML, network, webkit, bluetooth) when compiling.
• Double-check that your QML files are compatible with Quick 2.2.
• If you encounter a crash originating from QtGui.dll, try updating the QtGui module to the latest version.

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