Why Is My Qt 5.1.1 Application Failing to Start with a 'Missing Windows Platform Plugin' Error?

Qt 5.1.1: Resolving "Application failed to start because platform plugin 'windows' is missing" Error

The "Application failed to start" error with Qt platform plugin "windows" missing can be a frustrating issue for developers. While this issue has been encountered previously, many solutions have not addressed the underlying problem.

After careful investigation, the solution lies in the missing libEGL.dll. Despite other essential DLLs being present, Qt may fail to detect this specific dependency,导致错误消息。

Solution:

To resolve this issue, ensure that libEGL.dll is present in your application folder. This DLL can be found in the Qt installation directory under QtQt5.1.15.1.1msvc2012bin. Copy libEGL.dll into your release folder alongside other required DLLs like Qt5Core.dll and Qt5Gui.dll.

Note:

Renaming the "platforms" folder to "platform" does not address the issue of the missing Qt platform plugin "windows." The presence of libEGL.dll is essential for Qt to successfully load the platform plugin.

By incorporating this missing dependency, your Qt 5.1.1 application will be able to start successfully without encountering the troublesome "Application failed to start" error.

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