c++ - 在 WM_INPUT 消息中寻找键重复数据

Question

我刚开始在我的应用中使用原始输入。直接进入问题，在遗留 WM_KEYDOWN 消息中，可以检查 lParam 以获得有关按键的额外信息。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 消息是否针对重复键，以便我可以忽略该消息。(关闭键重复。)

我遇到的麻烦是找不到WM_INPUT 消息的信息。 WM_INPUT 消息的 lParam 包含 RAWINPUT 结构的句柄。在做一些研究时，我发现 RAWINPUT::header 中包含一个名为 wparam 的成员，MSDN 将其描述为

wParam Type: WPARAM The value passed in the wParam parameter of the WM_INPUT message.

我会在这里找到所需的信息还是在其他地方？

Answer 1

RAW Input API 不提供重复计数。它是直接来自键盘的原始数据。当生成 WM_KEY... 消息时，将在更高级别计算重复计数。使用 WM_INPUT，您必须手动跟踪每个键的按下/向上状态，以确定它们的重复计数。当一个键按下时，开始计算该键的每个 WM_INPUT 消息。当键上升时，停止计数。