上接 弹出窗口杀手(上)
注册系统热键
系统热键用在像弹出窗口杀手这种应用程序非常有用, Ctrl+Shift+J是缺省热键.
说道实现,我们继续用RegisterHotkey(HWND hWnd, int id, UINT fsModifiers, UINT vkey). 完成,代码如下:
public void SetHotKey(Keys c, bool bCtrl, bool bShift, bool bAlt, bool bWindows)
{
m_hotkey = c;
m_ctrlhotkey = bCtrl;
m_shifthotkey = bShift;
m_althotkey = bAlt;
m_winhotkey = bWindows;
// update hotkey
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, m_hotkey); //Keys.J);
}
一般的,注册热键要一下几步
/* ------- using HOTKEYs in a C# application -------
-- code snippet by James J Thompson --
在Form的load 中 : Ctrl+Shift+J
bool success = RegisterHotKey(Handle,
100,
KeyModifiers.Control | KeyModifiers.Shift,
Keys.J);
在 form的closing中 :
UnregisterHotKey(Handle, 100);
如何处理热键 :
protected override void WndProc( ref Message m )
{
const int WM_HOTKEY = 0x0312;
switch(m.Msg)
{
case WM_HOTKEY:
MessageBox.Show("Hotkey pressed");
ProcessHotkey();
break;
}
base.WndProc(ref m );
}
public class NativeWIN32
{
[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
}
}
------- using HOTKEYs in a C# application ------- */
当我们按下热键以后,流程是这样:首先用HWND GetForegroundWindow()来得到窗体,然后要抓出窗体的标题, GetWindowText(HWND hwnd, /*out*/LPTSTR lpString, int nMaxCount). 具体如下:
protected void ProcessHotkey()
{
IntPtr hwnd = NativeWIN32.GetForegroundWindow();
if (!hwnd.Equals(IntPtr.Zero))
{
NativeWIN32.STRINGBUFFER sWindowTitle;
NativeWIN32.GetWindowText(hwnd, out sWindowTitle, 256);
if (sWindowTitle.szText.Length>0)
AddWindowTitle( sWindowTitle.szText ); // add to the ListView (Form)
}
}
代码下载: http://www.codeproject.com/useritems/popupkiller/popupkiller_src_update.zip
演示程序: http://www.codeproject.com/useritems/popupkiller/popupkiller_demo_update.zip
(全文完)
