用户按键设置热键的简单方法.显示热键文本，保存虚拟键代码

本文关键字：保存 文本 虚拟 代码 显示 简单 设置 用户 方法 | 更新日期: 2023-09-27 18:21:19

不确定我是否足够好地解释了标题，但我希望有人按下任何键，然后我可以存储该键代码以备以后使用，但更重要的是，我希望直观地显示他们选择了什么键。有点像你在游戏中得到的键盘设置类型的东西。

我想知道是否有任何公共类或其他东西可以减轻为每个键编码的麻烦。

用户按键设置热键的简单方法.显示热键文本，保存虚拟键代码

有一个本机Win32控件专门为此设计，称为热键控件。您可能已经在Windows外壳程序和其他应用程序中看到过它的使用。这将是我建议你使用的，而不是试图自己重新发明轮子。

遗憾的是，WinForms没有为此控件提供包装器。这意味着你要么自己写，要么接受别人对类似类型控件的实现。

编辑：或者使用这个快速组合在一起的.NET包装器进行热键控件。整个公共接口是KeyData属性，它的工作原理与KeyEventArgs类的类似名称的属性相同。Text属性（通过从Control继承而提供）没有任何作用，但可以重载以返回所选热键的漂亮打印版本。此外，本机控件的HKM_SETRULES消息的功能未实现；如果您需要该功能，则需要自己添加代码。

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
internal static class NativeMethods
{
   internal const string HOTKEY_CLASS = "msctls_hotkey32";
   internal const int CS_GLOBALCLASS = 0x4000;
   internal const int WS_CHILD = 0x40000000;
   internal const int WS_VISIBLE = 0x10000000;
   internal const int WS_TABSTOP = 0x00010000;
   internal const int WS_EX_NOPARENTNOTIFY = 0x00000004;
   internal const int WS_EX_CLIENTEDGE = 0x00000200;
   internal const int WS_EX_LEFT = 0x00000000;
   internal const int WS_EX_LTRREADING = 0x00000000;
   internal const int WS_EX_RIGHTSCROLLBAR = 0x00000000;
   internal const int WS_EX_RIGHT = 0x00001000;
   internal const int WS_EX_RTLREADING = 0x00002000;
   internal const int WS_EX_LEFTSCROLLBAR = 0x00004000;
   internal const int HOTKEYF_SHIFT = 0x01;
   internal const int HOTKEYF_CONTROL = 0x02;
   internal const int HOTKEYF_ALT = 0x04;
   internal const int HOTKEYF_EXT = 0x08;
   internal const int WM_USER = 0x0400;
   internal const int HKM_SETHOTKEY = (WM_USER + 1);
   internal const int HKM_GETHOTKEY = (WM_USER + 2);
   internal const int HKM_SETRULES = (WM_USER + 3);
   [DllImport("user32.dll", CharSet = CharSet.Auto)]
   internal static extern IntPtr SendMessage(IntPtr hWnd,
                                             int msg,
                                             IntPtr wParam,
                                             IntPtr lParam);
}
class HotKey : Control
{
   public HotKey()
   {
      base.SetStyle(ControlStyles.UserPaint
                     | ControlStyles.StandardClick
                     | ControlStyles.StandardDoubleClick
                     | ControlStyles.UseTextForAccessibility, false);
      base.SetStyle(ControlStyles.FixedHeight, true);
   }
   public Keys KeyData
   {
      get
      {
         IntPtr retVal = NativeMethods.SendMessage(Handle,
                                                   NativeMethods.HKM_GETHOTKEY,
                                                   IntPtr.Zero,
                                                   IntPtr.Zero);
         Keys keyCode = (Keys)(retVal.ToInt32() & 0xFF);
         int modifierFlags = (retVal.ToInt32() >> 8);
         Keys modifiers = Keys.None;
         if ((modifierFlags & NativeMethods.HOTKEYF_ALT) == NativeMethods.HOTKEYF_ALT)
            modifiers |= Keys.Alt;
         if ((modifierFlags & NativeMethods.HOTKEYF_CONTROL) == NativeMethods.HOTKEYF_CONTROL)
            modifiers |= Keys.Control;
         if ((modifierFlags & NativeMethods.HOTKEYF_SHIFT) == NativeMethods.HOTKEYF_SHIFT)
            modifiers |= Keys.Shift;
         return (keyCode | modifiers);
      }
      set
      {
         Keys keyCode = (value & (~Keys.Alt & ~Keys.Control & ~Keys.Shift));
         int modifierFlags = 0;
         if ((value & Keys.Alt) == Keys.Alt)
            modifierFlags |= NativeMethods.HOTKEYF_ALT;
         if ((value & Keys.Control) == Keys.Control)
            modifierFlags |= NativeMethods.HOTKEYF_CONTROL;
         if ((value & Keys.Shift) == Keys.Shift)
            modifierFlags |= NativeMethods.HOTKEYF_SHIFT;
         NativeMethods.SendMessage(Handle,
                                   NativeMethods.HKM_SETHOTKEY,
                                   (IntPtr)((modifierFlags << 8) | ((int)keyCode & 0xffff)),
                                   IntPtr.Zero);
      }
   }
   protected override CreateParams CreateParams
   {
      get
      {
         CreateParams cp = base.CreateParams;
         cp.ClassName = NativeMethods.HOTKEY_CLASS;
         cp.ClassStyle = NativeMethods.CS_GLOBALCLASS;
         cp.Style = NativeMethods.WS_CHILD | NativeMethods.WS_VISIBLE | NativeMethods.WS_TABSTOP;
         cp.ExStyle = NativeMethods.WS_EX_NOPARENTNOTIFY | NativeMethods.WS_EX_CLIENTEDGE;
         if (RightToLeft == RightToLeft.No ||
            (RightToLeft == RightToLeft.Inherit && Parent.RightToLeft == RightToLeft.No))
         {
            cp.ExStyle |= NativeMethods.WS_EX_LEFT
                            | NativeMethods.WS_EX_LTRREADING
                            | NativeMethods.WS_EX_RIGHTSCROLLBAR;
         }
         else
         {
            cp.ExStyle |= NativeMethods.WS_EX_RIGHT
                           | NativeMethods.WS_EX_RTLREADING
                           | NativeMethods.WS_EX_LEFTSCROLLBAR;
         }
         return cp;
      }
   }
}

看看C#中的按键事件——移动图片框。

它提到了Control.KeyDown事件。

private Keys _lastKeyPressed;
public Form1()
{
    InitializeComponent();
    this.KeyDown += Form1_KeyDown;
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    // Do something with event keycode
    _lastKeyPressed = e.KeyCode;
}

您还可以监听Control.KeyUp事件，了解他们何时释放密钥。

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