Qt 运行时报错 This application failed to start because no Qt platform plugin could be initialized!

问题 运行时报错: This application failed to start because no Qt platform plugin could be initialized! 如图: 描述: 代码没有问题,我换成其他构件就正常了。如 5.12.7 解决方案: 环境变量中加入:QT_PLUGIN_PATH QT_PLUGIN_PATH=D:\Qt\Qt_SDK\5.12.6\msvc2
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