QT QPixmap：It is not safe to use Pixmaps outside the GUI thread
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写了一个程序，用了python的threading模块新建了一个线程来做了一些显示调用。运行的时候报下面的错误：
QT QPixmap：It is not safe to use Pixmaps outside the GUI thread
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Qt只允许主线程（也就是main函数在的那个线程）使用界面类，因为界面类不是线程安全的，不可重入，在多个线程中使用可能会出现问题，因此Qt不建议主界面线程外的线程使用图形类和调用图形类接口。否则有可能报错：<span style="font-family: 'Microsoft YaHei', SimHei, arial, 宋体; font-size: 15px;"><span style="color: rgb(255, 0, 0);">QT QPixmap：It is not safe to use Pixmaps outside the GUI thread</span> </span>
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