C# 或 .NET 刷新键盘缓冲区

问题描述

如何在 C# 中使用 Windows 窗体刷新键盘缓冲区?

How do I flush the keyboard buffer in C# using Windows Forms?

我有一个条码扫描器，其作用类似于键盘.如果扫描了一个很长的条形码并且在表单上点击了取消按钮，我需要清除键盘缓冲区.所以我需要刷新并忽略所有待处理的输入.我需要清除缓冲区，因为如果条形码包含空格，则空格会被处理为按钮单击，这是不必要的.

I have a barcode scanner which acts like a keyboard. If a really long barcode is scanned and the cancel button is hit on the form, I need the keyboard buffer to be cleared. So I need to flush and ignore all pending input. I need the buffer cleared because if the barcode contains spaces, the spaces are processed as button clicks which is unecessary.

推荐答案

我不确定你能做到这一点.击键进入主事件循环的事件队列.您为取消这些击键而采取的任何操作都将在击键后放入队列中.

I'm not sure you can do this. The keystrokes go into the event queue for the main event loop. Any action you take to cancel these keystrokes will be placed in the queue after the keystrokes.

只有在处理完击键后，事件循环才会执行您的取消操作.您只能根据击键序列中间发生的某些事件取消击键.

The event loop will only get to your cancel action after the keystrokes have been processed. You can only cancel the keystrokes based on some event that happens in the middle of the keystroke sequence.

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