/// <summary>Dispose the KeyboardHook.</summary>
public void Dispose()
{
if (_hookHandle != null)
{
_hookHandle.Dispose();
_hookHandle = null;
}
}
public static extern IntPtr CallNextHookEx(SafeWindowsHookHandle hhk, int nCode, IntPtr wParam, IntPtr lParam);
/// <summary>Initializes the keyboard hook.</summary>
/// <param name="keyDown">The delegate to be called when a key down event occurs.</param>
public KeyboardHook(int targetProcessID, KeyEventHandler keyDown)
{
if (keyDown == null) throw new ArgumentNullException("keyDown");
// Store the user's KeyDown delegate
_keyDown = keyDown;
_pid = targetProcessID;
// Create the callback and pin it, since it'll be called
// from unmanaged code
_hookProc = new LowLevelKeyboardProc(HookCallback);
// Set the hook for just the GUI thread
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
_hookHandle = SafeWindowsHookHandle.SetWindowsHookEx(
WH_KEYBOARD_LL, _hookProc,
GetModuleHandle(curModule.ModuleName), 0);
}
if (_hookHandle.IsInvalid)
{
Exception exc = new Win32Exception();
Dispose();
throw exc;
}
}