解决This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Windows pyqt打开designer.exe报错

报错信息

This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

解决办法

替换两个文件

cd  ..\Python\Lib\site-packages\pyqt5_tools\Qt\plugins\platforms 

复制上图中的两个文件到

cd  ..\Python\Lib\site-packages\pyqt5_tools\Qt\bin\platforms

将将原有文件重命名 - ，放置新文件

再次打开designer.exe，问题决了

安装pyqt5

pip install PyQt5 -i https://pypi.douban.com/simple

安装qt工具

pip install PyQt5-tools -i https://pypi.douban.com/simple

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