If you're using timers to track events and to make sure messages arrive in a timely manner, it's important to cancel these timers when a message is received.

如果您使用计时器跟踪事件，以确保消息及时到达，重要的是要在收到消息后取消这些计时器。

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Lastly, a timer can be canceled by sending a control message with the "cancel" action.

最后，可以通过发送具有“CANCEL”操作的控制消息来取消计时器。

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A message can be displayed to the user if the required fields aren't populated and false can be returned to cancel the update to the panel.

如果未填充必要的字段，则可以向用户显示一条消息，并返回False取消对面板的更新。

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But, in seven of the securities the trader wanted to cancel, an original message to trade the security was never sent, meaning in those cases there was nothing to cancel.

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