c# .net winform调用系统API来注册全局快捷键。

写一个单独的注册快捷键的类，直接在Form启动窗口代码里面调用：

这里注册了一个F12快捷键为示例代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public class HotKey
    {
        public HotKey(IntPtr handle)
        {
            // 注册当前窗口的快捷键 F12
            RegisterHotKey(handle, 102, KeyModifiers.Ctrl, Keys.F12);
        }

        /// <summary>
        /// 如果函数执行成功，返回值不为0。
        /// 如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。
        /// </summary>
        /// <param name="hWnd">要定义热键的窗口的句柄</param>
        /// <param name="id">定义热键ID（不能与其它ID重复）</param>
        /// <param name="fsModifiers">标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效</param>
        /// <param name="vk">定义热键的内容</param>
        /// <returns></returns>
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, KeyModifiers fsModifiers, Keys vk);

        /// <summary>
        /// 注销热键
        /// </summary>
        /// <param name="hWnd">要取消热键的窗口的句柄</param>
        /// <param name="id">要取消热键的ID</param>
        /// <returns></returns>
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);


        /// <summary>
        /// 注册热键
        /// </summary>
        /// <param name="hwnd">窗口句柄</param>
        /// <param name="hotKey_id">热键ID</param>
        /// <param name="keyModifiers">组合键</param>
        /// <param name="key">热键</param>
        public static void RegHotKey(IntPtr hwnd, int hotKeyId, KeyModifiers keyModifiers, Keys key)
        {
            if (!RegisterHotKey(hwnd, hotKeyId, keyModifiers, key))
            {
                int errorCode = Marshal.GetLastWin32Error();
                if (errorCode == 1409)
                {
                    MessageBox.Show("热键被占用 ！");
                }
                else
                {
                    MessageBox.Show("注册热键失败！错误代码：" + errorCode);
                }
            }
        }

        /// <summary>
        /// 注销热键
        /// </summary>
        /// <param name="hwnd">窗口句柄</param>
        /// <param name="hotKey_id">热键ID</param>
        public static void UnRegHotKey(IntPtr hwnd, int hotKeyId)
        {
            //注销指定的热键
            UnregisterHotKey(hwnd, hotKeyId);
        }

        /// <summary>
        /// 辅助键名称。
        /// Alt, Ctrl, Shift, WindowsKey
        /// </summary>
        [Flags()]
        public enum KeyModifiers { None = 0, Alt = 1, Ctrl = 2, Shift = 4, WindowsKey = 8 }

    }
}

在Form窗口床架完毕事件里面写调用注册快捷键的类，传递窗口句柄过去：

/// <summary>
/// 窗口加载完毕
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void netkapper_Load(object sender, EventArgs e)
{
    HotKey hotKey = new HotKey(Handle);
}

还在Form窗口类里面，重写win消息循环函数，来处理快捷键的触发事件：

/// <summary>
/// 快捷键触发事件，重写win窗口的消息循环
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        //这个是window消息定义的注册的热键消息
        case 0x0312:    
           // 测试按键的值
           // MessageBox.Show(m.WParam.ToString());
           switch(m.WParam.ToString())
            {
                case "102": // 按下CTRL+F12 
                    // code
                    break;
            }
            break;
    }
    base.WndProc(ref m);
}

亲测有效，记录方便自己后面使用。