调用win32 API,实现全局系统热键小结

最近在做客服呼叫中心的项目，是C/S的windows系统，其中有个模块要实现象QQ那样的热键呼出，所以总结了一下这方面的代码。//API辅助操作类using System;
using System.Windows.Forms; // for Key namespace
using System.Runtime.InteropServices; namespace hotkeytest
{
/// <summary>
/// WIN32 Windows API辅助操作类.
/// </summary>
public class NativeWIN32
{
public NativeWIN32()
{}
/* ------- using WIN32 Windows API in a C# application ------- */ [DllImport("user32.dll", CharSet=CharSet.Auto)]
static public extern IntPtr GetForegroundWindow(); // [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct STRINGBUFFER
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=256)]
public string szText;
} [DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int GetWindowText(IntPtr hWnd, out STRINGBUFFER ClassName, int nMaxCount); [DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam); [DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam); public const int WM_SYSCOMMAND = 0x0112;
public const int SC_CLOSE = 0xF060; public delegate bool EnumThreadProc(IntPtr hwnd, IntPtr lParam); [DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern bool EnumThreadWindows(int threadId, EnumThreadProc pfnEnum, IntPtr lParam); [DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr FindWindowEx(IntPtr parent, IntPtr next, string sClassName, IntPtr sWindowTitle);
/* ------- using HOTKEYs in a C# application ------- in form load :
bool success = RegisterHotKey(Handle, 100, KeyModifiers.Control | KeyModifiers.Shift, Keys.J); in form closing :
UnregisterHotKey(Handle, 100);
protected override void WndProc( ref Message m )
{
const int WM_HOTKEY = 0x0312;

switch(m.Msg)
{
case WM_HOTKEY:
MessageBox.Show("Hotkey pressed");
break;
}
base.WndProc(ref m );
} ------- using HOTKEYs in a C# application ------- */ [DllImport("user32.dll", SetLastError=true)]
public static extern bool RegisterHotKey( IntPtr hWnd, // handle to window
int id, // hot key identifier
KeyModifiers fsModifiers, // key-modifier options
Keys vk // virtual-key code
);

[DllImport("user32.dll", SetLastError=true)]
public static extern bool UnregisterHotKey( IntPtr hWnd, // handle to window
int id // hot key identifier
); [Flags()]
public enum KeyModifiers
{
None = 0,
Alt = 1,
Control = 2,
Shift = 4,
Windows = 8
}
}
}
________________________________________
窗体代码： protected const String m_sFilename = "config.xml";
protected Keys m_hotkey;
protected bool m_ctrlhotkey, m_shifthotkey, m_althotkey, m_winhotkey; //监视热键
protected override void WndProc( ref Message m )
{
const int WM_HOTKEY = 0x0312;

switch(m.Msg)
{
case WM_HOTKEY:
MessageBox.Show("您点了热键!");
break; }
base.WndProc(ref m );
}
//注册热键
public void SetHotKey(Keys c, bool bCtrl, bool bShift, bool bAlt, bool bWindows)
{
//先赋到变量
m_hotkey = c;
m_ctrlhotkey = bCtrl;
m_shifthotkey = bShift;
m_althotkey = bAlt;
m_winhotkey = bWindows; //注册系统热键
NativeWIN32.KeyModifiers modifiers = NativeWIN32.KeyModifiers.None;
if (m_ctrlhotkey)
modifiers |= NativeWIN32.KeyModifiers.Control;
if (m_shifthotkey)
modifiers |= NativeWIN32.KeyModifiers.Shift;
if (m_althotkey)
modifiers |= NativeWIN32.KeyModifiers.Alt;
if (m_winhotkey)
modifiers |= NativeWIN32.KeyModifiers.Windows;
NativeWIN32.RegisterHotKey(Handle, 100, modifiers, c);
}
private void Form1_Load(object sender, System.EventArgs e)
{
//设置初始热键// default hotkey is Ctrl+Shift+J
// m_hotkey = Keys.Home;
// m_hotkey = Keys.J;
// m_ctrlhotkey = true;
// m_shifthotkey = true;
// m_althotkey = false;
// m_winhotkey = false;
// SetHotKey(m_hotkey, m_ctrlhotkey, m_shifthotkey, m_althotkey, m_winhotkey);
//读取配置热键
LoadSetting();////读配置文件（读取热键到变量）
ShowHotkey();//显示热键到文本框 } //显示热键到文本框
public void ShowHotkey()
{
String sHotKey = "";
if (m_ctrlhotkey)
sHotKey += "Ctrl"; if (m_shifthotkey)
{
if (sHotKey.Length!=0)
sHotKey += " + ";
sHotKey += "Shift";
}
if (m_althotkey)
{
if (sHotKey.Length!=0)
sHotKey += " + ";
sHotKey += "Alt";
}
if (m_winhotkey)
{
if (sHotKey.Length!=0)
sHotKey += " + ";
sHotKey += "Win";
}
if (sHotKey.Length!=0)
sHotKey += " + ";
sHotKey += (char)(int)m_hotkey;
this.textBox1.Text=sHotKey;
this.textBox1.Select(0,0);
}
//读配置文件 方法2 （读取热键到变量）
public void LoadSetting()
{
System.Xml.XmlTextReader reader = null;
if (!System.IO.File.Exists(m_sFilename)) return;
try
{
reader = new System.Xml.XmlTextReader(m_sFilename);
reader.WhitespaceHandling = System.Xml.WhitespaceHandling.None;

bool bEnablePageContent = false; //是否有page节点
bool bEnableHotkeyContent = false; //是否有hotkey节点

while (reader.Read())
{
switch (reader.NodeType)
{
case System.Xml.XmlNodeType.Element:// are we parsing a <page> element
bEnablePageContent = (reader.Name=="page");//是否有page节点
bEnableHotkeyContent = (reader.Name=="hotkey");//是否有hotkey节点
if (bEnableHotkeyContent)
{
if (reader["ctrl"]!=null)
m_ctrlhotkey = (reader["ctrl"]=="true")?true:false;
if (reader["shift"]!=null)
m_shifthotkey = (reader["shift"]=="true")?true:false;
if (reader["alt"]!=null)
m_althotkey = (reader["alt"]=="true")?true:false;
if (reader["windows"]!=null)
m_winhotkey = (reader["windows"]=="true")?true:false;
}
break;
case System.Xml.XmlNodeType.Text:
if (bEnableHotkeyContent)
{ m_hotkey = (Keys) System.Int32.Parse(reader.Value);
SetHotKey(m_hotkey, m_ctrlhotkey, m_shifthotkey, m_althotkey, m_winhotkey); // register hotkey
}
bEnablePageContent = false;
bEnableHotkeyContent = false;
break;
case System.Xml.XmlNodeType.Attribute:
if (bEnableHotkeyContent)
{
if (reader.Name=="ctrl")
m_ctrlhotkey = (reader.Value=="true")?true:false;
if (reader.Name=="shift")
m_shifthotkey = (reader.Value=="true")?true:false;
if (reader.Name=="alt")
m_althotkey = (reader.Value=="true")?true:false;
if (reader.Name=="windows")
m_winhotkey = (reader.Value=="true")?true:false;
}
break; }
} // end while
}
catch( System.Xml.XmlException e)
{
e.ToString();
}
finally
{
if (reader!=null) reader.Close();
}
}
// 存储热键到配置文件
public void SaveSetting()
{
System.Xml.XmlTextWriter w = new System.Xml.XmlTextWriter(m_sFilename, new System.Text.UTF8Encoding());
w.Formatting = System.Xml.Formatting.Indented;
w.WriteStartDocument();
w.WriteStartElement("setting"); w.WriteStartElement("hotkey"); // <hotkey>
w.WriteAttributeString("ctrl",m_ctrlhotkey?"true":"false");
w.WriteAttributeString("shift",m_shifthotkey?"true":"false");
w.WriteAttributeString("alt",m_althotkey?"true":"false");
w.WriteAttributeString("windows",m_winhotkey?"true":"false");
int n = (int) m_hotkey;
w.WriteString( n.ToString() );
w.WriteEndElement(); // </hotkey> w.WriteEndElement(); // </popupkiller>
w.Close();
} private void button1_Click(object sender, System.EventArgs e)
{
SetHotKey(m_hotkey, m_ctrlhotkey, m_shifthotkey, m_althotkey, m_winhotkey);
SaveSetting();
// Close();
} //设置热键
private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
// SetHotKey(e.KeyCode,
// (ModifierKeys&Keys.Control)>0?true:false,
// (ModifierKeys&Keys.Shift)>0?true:false,
// (ModifierKeys&Keys.Alt)>0?true:false,
// ((ModifierKeys&Keys.LWin)>0||(ModifierKeys&Keys.RWin)>0)?true:false ); m_hotkey = e.KeyCode;
m_ctrlhotkey = (ModifierKeys&Keys.Control)>0?true:false;
m_shifthotkey = (ModifierKeys&Keys.Shift)>0?true:false;
m_althotkey = (ModifierKeys&Keys.Alt)>0?true:false;
m_winhotkey = ((ModifierKeys&Keys.LWin)>0||(ModifierKeys&Keys.RWin)>0)?true:false; ShowHotkey();//显示热键到文本框

}