keybd_event的参数问题

Question

如题，关于keybd_event的第三个参数的解释我查了一些资料和微软官网的资料，关于第三个参数共有三个值其中0，和2我常用但是当值为1时是什么意思呢？有人跟我说是启用扩展的意思但我还是没理解，希望有人给我解释下这个参数，谢谢。

下面链接是微软文档里面的解释。

微软官方的解释

Answer 1

你好：

KEYEVENTF_EXTENDEDKEY 0x0001

If specified, the scan code was preceded by a prefix byte having the value 0xE0 (224).

官方的解释翻译过来意思应该是扫描的键盘码会带0xE0的前缀，我查了一下，带这个字节的前缀的是键盘右侧的小键盘部分。意思可能是只监视小键盘的事件，你可以用代码测试一下。

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Answer 2

Thank You!

Answer 3

您好，我试了下如果第三个参数改为1的话会发送两次虚拟按键。如果设为2的话则只发送一次，似乎和小键盘没有什么关系？

 public static void SendKey(Keys key)
        {
            keybd_event((byte)key, 0, 0, 0);
            keybd_event((byte)key, 0, 2, 0);
        }

Answer 4

建议你到C++或者Windows相关的论坛去问一下，这个问题已经脱离了.Net Framework的范畴了。我暂时也给不了你答案。

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