QPixmap: It is not safe to use pixmaps outside the GUI thread
2014-04-02 16:45
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今天遇到这个问题
程序是次线程处理完数据后，发射一个信号给主线程，显示更新图片，然后提示QPixmap: It is not safe to use pixmaps outside the GUI thread
提示这个错误的时候两个线程之间的信号槽连接属性是Qt::DirectConnection，会提示不是在GUI线程里
后面属性改为默认的，不写，就不会出现这个问题了。
关键还是看连接属性的具体说明：
Qt::AutoConnection
0 (default) If the signal is emitted from a different thread than the receiving object, the signal is queued,
behaving as Qt::QueuedConnection. Otherwise, the slot is invoked directly, behaving as Qt::DirectConnection. The type of connection is determined when the signal is emitted.
Qt::DirectConnection 1
The slot is invoked immediately, when the signal is emitted.
Qt::QueuedConnection 2
The slot is invoked when control returns to the event loop of the receiver's thread. The slot is executed in the receiver's thread.
程序是次线程处理完数据后，发射一个信号给主线程，显示更新图片，然后提示QPixmap: It is not safe to use pixmaps outside the GUI thread
提示这个错误的时候两个线程之间的信号槽连接属性是Qt::DirectConnection，会提示不是在GUI线程里
后面属性改为默认的，不写，就不会出现这个问题了。
关键还是看连接属性的具体说明：
Qt::AutoConnection
0 (default) If the signal is emitted from a different thread than the receiving object, the signal is queued,
behaving as Qt::QueuedConnection. Otherwise, the slot is invoked directly, behaving as Qt::DirectConnection. The type of connection is determined when the signal is emitted.
Qt::DirectConnection 1
The slot is invoked immediately, when the signal is emitted.
Qt::QueuedConnection 2
The slot is invoked when control returns to the event loop of the receiver's thread. The slot is executed in the receiver's thread.
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