停止重复键(C#) [英] Stopping keys from repeating (C#)

问题描述

在此应用程序中，我需要能够停止按下某个键的响应，以防止不必要的数据进入输出.我遇到的问题是，使用下面代码中的方法确实可以防止按键重复，但是也阻止了它们足够的响应-因为用户很快就会敲击按键.

In this application, I need to be able to stop the response from a key which is held down in order to prevent unnessecary data from entering the output. The problem I'm having is, using the methods in my code below does prevent the keys from repeating, but it also stops them from being responsive enough - as the users are hitting the keys very quickly.

我不确定这是我的硬件，api限制还是我的代码有问题，但是我下面的例程不能简单快速地运行，而又不会导致程序无法使用.一种确定密钥是否被有效按下(以及持续多长时间)的方法也将有助于该程序的另一功能并解决当前问题.

I'm not sure if it's my hardware, api restriction or a problem with my code, but the routines I have below do not simply come round fast enough to work without making the program impossible to use. A way of identifying if a key is being actively held down (and for how long) would also help another feature for the program and solve this current issue.

有什么想法吗?

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    e.SuppressKeyPress = isKeyDown;
    isKeyDown = true;
}

private void Form1_KeyUp(object sender, KeyEventArgs e)
{
    isKeyDown = false;
}

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!isStreamPlaying) return;
    if (e.KeyChar.Equals('d') || e.KeyChar.Equals('j'))
    {
        //red hit
        SoundPlayer hitSounds = new SoundPlayer(taikoLiveMapper.Properties.Resources.normal_hitnormal);
        hitSounds.Play();
        outputlist.Add(string.Format("320,240,{0},1,{1}", ms, 0));
        lastms = ms;
    }
    else if (e.KeyChar.Equals('s') || e.KeyChar.Equals('k'))
    {
        //blue hit
        SoundPlayer hitSounds = new SoundPlayer(taikoLiveMapper.Properties.Resources.normal_hitclap);
        hitSounds.Play();
        outputlist.Add(string.Format("320,240,{0},1,{1}", ms, 8));
        lastms = ms;
    }
}

推荐答案

您可以使用GetKeyState来查找某个键是否按下并使用它来跟踪键:

You can use GetKeyState to find out if a key is down and use that to track the keys:

    [DllImport("user32.dll")]
    static extern short GetKeyState(int key);

    static bool IsKeyPressed(Keys key)
    {
        short state = GetKeyState((int)key);
        return ((state & 128) != 0);
    }

    int i = 0;

    Dictionary<Keys, DateTime> downSince = new Dictionary<Keys, DateTime>();

    private void UpdateKeyStates()
    {
        foreach (var entry in downSince.ToArray())
        {
            if (!IsKeyPressed(entry.Key))
                downSince.Remove(entry.Key);
        }
    }

    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        UpdateKeyStates();
        if (!downSince.ContainsKey(e.KeyCode))
        {
            downSince.Add(e.KeyCode, DateTime.UtcNow);
            i++;

        }
        Text = i.ToString() + " " +(int)(DateTime.UtcNow - downSince[e.KeyCode]).TotalMilliseconds;
    }

    private void Form1_KeyUp(object sender, KeyEventArgs e)
    {
        UpdateKeyStates();
    }

此示例在每次按下一个键时递增i，并显示按下该键的时间.它使用GetKeyState而不是跟踪KeyDown/KeyUp，因为如果其他东西有焦点，您可能会错过这些消息.

This example counts i up every time a key is pressed, and shows for how long it has been pressed. It uses GetKeyState instead of tracking KeyDown/KeyUp since you might miss those messages if something else has focus.

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