using System;
using System.Runtime.InteropServices;
namespace HotKeys
{
public delegate void HotkeyEventHandler(int HotKeyID);
public class Hotkey : System.Windows.Forms.IMessageFilter
{
//存储定义的热键的ID
System.Collections.Hashtable keyIDs = new System.Collections.Hashtable();
//存放调用该类的窗体的句柄
IntPtr hWnd;
//热键的事件
public event HotkeyEventHandler OnHotkey;
//组合键枚举
public enum KeyFlags
{
MOD_ALT = 0x1,
MOD_CONTROL = 0x2,
MOD_SHIFT = 0x4,
MOD_WIN = 0x8
}
//注册热键API
[DllImport("user32.dll")]
public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);
//删除热键API
[DllImport("user32.dll")]
public static extern UInt32 UnregisterHotKey(IntPtr hWnd, UInt32 id);
//填加全局原子表API,获取得到一个唯一标识的原子
[DllImport("kernel32.dll")]
public static extern UInt32 GlobalAddAtom(String lpString);
//释放全局原子表API
[DllImport("kernel32.dll")]
public static extern UInt32 GlobalDeleteAtom(UInt32 nAtom);
/**//// <summary>
/// 构造函数
/// </summary>
/// <param name="hWnd">调用该类的窗体的句柄</param>
public Hotkey(IntPtr hWnd)
{
this.hWnd = hWnd;
//在类中监窗体的消息
System.Windows.Forms.Application.AddMessageFilter(this);
}
/**//// <summary>
/// 注册热键
/// </summary>
/// <param name="Key">常规键</param>
/// <param name="keyflags">功能键</param>
/// <returns>热键ID</returns>
public int RegisterHotkey(System.Windows.Forms.Keys Key, KeyFlags keyflags)
{
UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());
RegisterHotKey((IntPtr)hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);
keyIDs.Add(hotkeyid, hotkeyid);
return (int)hotkeyid;
}
/**//// <summary>
/// 释放全部热键
/// </summary>
public bool UnregisterHotkeys()
{
try
{
foreach (UInt32 key in keyIDs.Values)
{
UnregisterHotKey(hWnd, key);
}
return true;
}
catch (Exception ex)
{
return false;
}
}
/**//// <summary>
/// 释放指定热键
/// </summary>
/// <param name="key">热键ID</param>
public bool UnregisterHotkeys(UInt32 key)
{
try
{
UnregisterHotKey(hWnd, key);
GlobalDeleteAtom(key);
keyIDs.Remove(key);
return true;
}
catch (Exception ex)
{
return false;
}
}
/**//// <summary>
/// 监视热键
/// </summary>
/// <param name="m">窗体消息</param>
/// <returns></returns>
public bool PreFilterMessage(ref System.Windows.Forms.Message m)
{
//如果m.Msg的值为0x0312那么表示用户按下了热键
if (m.Msg == 0x312)
{
//是否有对应的事件函数
if (OnHotkey != null)
{
//在热键集合中查找当前按键
foreach (UInt32 key in keyIDs.Values)
{
if ((UInt32)m.WParam == key)
{
//执行事件函数
OnHotkey((int)m.WParam);
return true;
}
}
}
}
return false;
}
}
}