Question

C# WinForm如何实现全局快捷键？

如何实现让程序在后台运行的时候也能响应快捷键？就像千千静听一样。。

比如一个A窗体，在后台运行时，用ctrl+alt+s让它调出来，如何实现？

小弟初学，要实现的代码，最好通过运行，谢谢！

Answer 1

这是个封装好的类，非常好用，不懂怎么使用可以百度给我发消息
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;

}

}
}

Answer 2

全屏钩子 ， 嵌入WIN32 API ，公共语言运行时不支持 ， 还是把网上的代码好好看一遍 ， 否则到最后自己都不知道干什么

Answer 3

写到全局变量里，不过这个不符合编程规范的

Answer 4

使用api 钩子