最后，可以通过发送具有“CANCEL”操作的控制消息来取消计时器。
Lastly, a timer can be canceled by sending a control message with the "cancel" action.
虽然前面两个命令类型不会对内核进行任何操作，但是其余命令则是用于读取日志消息或控制日志。
Although the first two command types perform no action within the kernel, the rest are used to read log messages or control aspects of logging.
这些消息是由应用程序发送给Q Capture的，用以控制Q Capture的操作行为。
These are messages that are sent from the application to QCapture to control the operational behavior of QCapture.
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