Why Does My Static Qt 5 Application Fail to Load the \'Windows\' Platform Plugin, and How Can I Fix It?

Resolving Qt5 Static Build Issue: "Failed to Load Platform Plugin 'Windows'"

Encountering the "Failed to load platform plugin 'windows'" error while running a Qt application under Windows using Visual Studio 2012 with a static Qt 5.0.2 distribution indicates a necessary step missing in the build configuration. Specifically, there is an oversight in deploying an essential DLL dependency.

To resolve this issue, the offending DLL, qwindows.dll, must be moved to the application directory alongside the rest of the Qt binary components. Unlike a dynamic build, the necessary plugin directory structure is absent in a static build, requiring plugins to be directly deployed alongside the binaries.

To ensure flawless execution, follow these steps:

1. Verify that Qt5Core.dll and other necessary DLLs (Qt5Guid.dll, Qt5Widgetsd.lib, etc.) are present within the application directory.
2. Locate the qwindows.dll file within the Qt installation directory (QT_BASE/.../plugins/platforms/).
3. Copy qwindows.dll into the application directory beside the compiled executable (yourapp.exe).

For this specific issue, adding libEGL.dll is not essential since the application lacks a substantial GUI. However, the resolution outlined above should resolve the reported "Failed to Load platform plugin 'windows'" error, enabling the Qt application to function as intended.

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