在C#程序中使用系统热键

在C#使用系统热键要引用System.Runtime.InteropServices。

下面是一个写好的调用系统热键的类：

using System;
using System.Runtime.InteropServices;

namespace SystemHotKey
{
public delegate void HotkeyEventHandler(int HotKeyID);

public class Hotkey : System.Windows.Forms.IMessageFilter
{
System.Collections.Hashtable keyIDs = new System.Collections.Hashtable();
IntPtr hWnd;

public event HotkeyEventHandler OnHotkey;

public enum KeyFlags
{
MOD_ALT = 0x1,
MOD_CONTROL = 0x2,
MOD_SHIFT = 0x4,
MOD_WIN = 0x8
}
[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 Hotkey(IntPtr hWnd)
{
this.hWnd = hWnd;
System.Windows.Forms.Application.AddMessageFilter(this);
}

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;
}

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

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

调用该类：

1.在代码中声明一个变量：

Hotkey hotkey;
hotkey = new Hotkey(this.Handle);
Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.F1, Hotkey.KeyFlags.MOD_CONTROL);//定义快键(Ctrl + F1)
hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);


3.写使用热键的事件代码：

public void OnHotkey(int HotkeyID)
{
if(HotkeyID == Hotkey1)
{
if(this.Visible == true)
this.Visible = false;
else
this.Visible = true;
}
else
{
this.Visible = false;
}
}

恭喜成功调用！

附件中是包含此代码的完整未例。

下载链接：http://files.cnblogs.com/saptechnique/WindowsFormsApplication1.rar

附：

参考文章的地址：

http://xxy12300.blog.163.com/blog/static/2634345820098112848758/