Winform 多组合老板键Alt_Ctrl_Shift

2年前 (2022) 程序员胖胖胖虎阿

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某天，为了给微博粉丝精灵增加个老板键功能，找一惯的方式，开始从网络下手寻找：关键字类似”C# 老板键“，一搜，一堆又一堆，然而出来的代码，基本上都是一个样的：

正常来说，老板键一般少不了：Alt+Ctrl+Shift+XX这种多组合方式，然而各类代码就是不直接说明，也没个提示，看来是有意隐藏，终于，还是被我发现其中的一些不为人知的隐藏属性：

下面看一下本人修改自网络常见的代码：

public delegate void HotkeyEventHandler(int HotKeyID);

    public class SystemHotKey : System.Windows.Forms.IMessageFilter
    {
        List<UInt32> keyIDs = new List<UInt32>();
        IntPtr hWnd;

public event HotkeyEventHandler OnHotkey;

        public enum KeyFlags
        {
            Alt = 0x1,
            Ctrl = 0x2,
            Shift = 0x4,
            Win = 0x8,
            //组合键等于值相加
            Alt_Ctrl = 0x3,
            Alt_Shift = 0x5,
            Ctrl_Shift = 0x6,
            Alt_Ctrl_Shift = 0x7
        }
        [DllImport("user32.dll")]
        public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);

[DllImport("user32.dll")]
public static extern UInt32 UnregisterHotKey(IntPtr hWnd, UInt32 id);

[DllImport("kernel32.dll")]
public static extern UInt32 GlobalAddAtom(String lpString);

[DllImport("kernel32.dll")]
public static extern UInt32 GlobalDeleteAtom(UInt32 nAtom);

        public SystemHotKey(IntPtr hWnd)
        {
            this.hWnd = hWnd;
        }

        public int RegisterHotkey(KeyFlags keyflags, System.Windows.Forms.Keys Key)
        {
            System.Windows.Forms.Application.AddMessageFilter(this);
            UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());
            RegisterHotKey((IntPtr)hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);
            keyIDs.Add(hotkeyid);
            return (int)hotkeyid;
        }

        public void UnregisterHotkeys()
        {
            if (keyIDs.Count > 0)
            {

                System.Windows.Forms.Application.RemoveMessageFilter(this);
                foreach (UInt32 key in keyIDs)
                {
                    UnregisterHotKey(hWnd, key);
                    GlobalDeleteAtom(key);
                }
                keyIDs.Clear();
            }
        }

        public bool PreFilterMessage(ref   System.Windows.Forms.Message m)
        {
            if (m.Msg == 0x312)
            {
                if (OnHotkey != null)
                {
                    foreach (UInt32 key in keyIDs)
                    {
                        if ((UInt32)m.WParam == key)
                        {
                            OnHotkey((int)m.WParam);
                            return true;
                        }
                    }
                }
            }
            return false;
        }
    }