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)