private void SubscribeToGlobalKeyboardEvents()
{
// install Keyboard hook only if it is not installed and must be installed
if (mKeyboardHookHandle == 0)
{
// See comment of this field. To avoid GC to clean it up.
mKeyboardDelegate = KeyboardHookProc;
// install hook
//Marshal.GetHINSTANCE(typeof(KeyboardEventHookManager).Assembly.GetModules()[0]),
mKeyboardHookHandle = NativeMethods.SetWindowsHookEx(
(int)HookEventEnum.WH_KEYBOARD_LL,
mKeyboardDelegate,
NativeMethods.GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName),
0);
// If SetWindowsHookEx fails.
if (mKeyboardHookHandle == 0)
{
// Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
// Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}
private void UnsunscribeFromGlobalKeyboardEvents()
{
if (mKeyboardHookHandle != 0)
{
// uninstall hook
int result = NativeMethods.UnhookWindowsHookEx(mKeyboardHookHandle);
// reset invalid handle
mKeyboardHookHandle = 0;
// Free up for GC
mKeyboardDelegate = null;
// if failed and exception must be thrown
if (result == 0)
{
// Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
// Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}
public static extern int SetWindowsHookEx(int idHook, HookProcessDelegate lpfn, IntPtr hMod, int dwThreadId);
public static extern int SetWindowsHookEx(int idHook, HookProcessDelegate lpfn, IntPtr hMod, int dwThreadId);
