检查键盘输入Winforms

问题描述

我想知道是否不是这样做

I was wondering if instead of doing this

protected override void OnKeyDown(KeyEventArgs e)
{
    if (e.KeyCode == Keys.A)
        Console.WriteLine("The A key is down.");
}

我可以设置bool方法并执行以下操作:

I could set up a bool method and do this:

if(KeyDown(Keys.A))
// do whatever here

我坐在这里已经很久了，试图弄清楚该怎么做.但是我只是不能把头缠住它.

I've been sitting here for ages trying to figure out how to do it. But I just can't wrap my head around it.

如果您想知道，我的计划是在另一个方法中调用bool，以检查输入.

In case you were wondering, my plan is to call the bool inside a different method, to check for input.

推荐答案

由于您通常希望在按下某个键后立即执行操作，因此通常使用KeyDown事件就足够了.

Since you usually want to perform an action immediately after pressing a key, usually using a KeyDown event is enough.

但是在某些情况下，我想您想检查某个过程中某个特定键是否已关闭，因此您可以使用 GetKeyState 方法如下:

But in some cases I suppose you want to check if a specific key is down in middle of a some process, so you can use GetKeyState method this way:

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern short GetKeyState(int keyCode);
public const int KEY_PRESSED = 0x8000;
public static bool IsKeyDown(Keys key)
{
    return Convert.ToBoolean(GetKeyState((int)key) & KEY_PRESSED);
}

您应该知道，每次使用例如IsKeyDown(Keys.A)来检查键状态时，如果在检查状态时按下了键，该方法都会返回true.

You should know, each time you check the key state using for example IsKeyDown(Keys.A) the method returns true if the key is pressed at the moment of checking the state.

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