并编写捕获标志信号程序，自定义消息。
The program for capturing sign signal was programmed and specific message was defined.
采集线程捕获帧数据标志信号并发送到主线程，主线程收消息，执行相应的处理。
The sign signal was captured by gathering thread and sent the message to main thread, and main thread received the message and processed it accordingly.
当事情变得艰难时，我们就会看到警告标志和信号。
We see the warning signs and signals when things get rough and difficult.
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