This application failed to start because no Qt platform plugin could be initialized

错误提示

在打开PyQt5-tools中的Designer.exe时，提示如下错误：

designer

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

解决方法

定位到Python38\Lib\site-packages\PyQt5\Qt\plugins，这个位置取决于你安装Python的位置，我的电脑上该位置的完整路劲是：C:\Users\focksor\AppData\Local\Programs\Python\Python38\Lib\site-packages\PyQt5\Qt\plugins。

将该目录下的platforms文件夹复制到Python38\Lib\site-packages\pyqt5_tools\Qt\bin，并替换处于该目录下的platforms内的文件。

再次打开designer.exe，此时问题应该已解决。

参考

PyQt5 Designer is not working: This application failed to start because no Qt platform plugin could be initialized

提示

如果你同样遇到该问题并通过此贴解决了问题，你可以留下你的评论来提示后来人该方法是可行的。

This application failed to start because no Qt platform plugin could be initialized

原文：https://www.cnblogs.com/focksor/p/13166970.html