在WM_INPUT消息中寻找密钥重复数据

Question

我刚刚开始为我的应用程序使用Raw Input。直截了当地问这个问题，可以在旧WM_KEYDOWN消息lParam中检查以获得有关按键的其他信息。像这些-

 Bits   Meaning
    0-15    The repeat count for the current message. 
            The value is the number of times the keystroke is autorepeated as a         
            result of the user holding down the key. If the keystroke is 
            held long enough, multiple messages are sent. However, the repeat 
            count is not cumulative.
   16-23    The scan code. The value depends on the OEM.
   24       Indicates whether the key is an extended key, such as the right-hand
            ALT and CTRL keys that appear on an enhanced 101- or 102-key 
            keyboard. The value is 1 if it is an extended key; otherwise, it is
            0.
   25-28    Reserved; do not use.
   29       The context code. The value is always 0 for a WM_KEYDOWN message.
   30       The previous key state. The value is 1 if the key is down before the
            message is sent, or it is zero if the key is up.
   31       The transition state. The value is always 0 for a WM_KEYDOWN
            message.

我想知道WM_INPUT消息是否针对重复的键，因此我可以忽略该消息。（请关闭keyrepeat。）

我遇到的麻烦是找不到该WM_INPUT消息的信息。的lParam所述的WM_INPUT消息中包含的句柄RAWINPUT结构。经过研究，我发现其中RAWINPUT::header包含一个名为wparam的成员，MSDN将其描述为

wParam 类型：在消息WPARAM 的wParam参数中传递的值WM_INPUT。

我可以在这里找到所需的信息还是在其他地方？

Answer 1

RAW输入API不提供重复计数。它是直接来自键盘的原始数据。WM_KEY...生成消息时，将在更高级别上计算重复计数。使用WM_INPUT，您将必须手动跟踪每个键的向下/向上状态，以确定您自己的重复计数。当某个键失效时，开始计算WM_INPUT该键的每条消息。当钥匙升起时，停止计数。