public override void InstallHook()
{
lock (_syncObject) {
if (Status != DeviceHookStatus.Uninstalled && !Disposing)
{
throw new SoftwareException("Keyboard hook has already been installed. Current Status is '{0}'", Status);
}
if (_hKeyboardHook == IntPtr.Zero)
{
using (var process = Process.GetCurrentProcess()) {
//// Keep the delegate as a field to prevent garbage collection
_keyboardHookProcedure = KeyboardHookProc;
_hKeyboardHook = WinAPI.USER32.SetWindowsHookEx(
WinAPI.USER32.HookType.WH_KEYBOARD_LL,
_keyboardHookProcedure,
//Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]) // NOTE: 2021-08-03 removed since .NET 4+ and Core 3+ use new approach https://www.programmersought.com/article/51595908521/
WinAPI.KERNEL32.GetModuleHandle(null),
0
);
// If SetWindowsHookEx fails.
if (_hKeyboardHook == IntPtr.Zero && !Disposing)
{
throw new WindowsException(WinAPI.KERNEL32.GetLastError(),
"Windows did not allow the application to install a keyboard hook.");
}
}
}
Status = DeviceHookStatus.Disabled;
}
}
public override void UninstallHook()
{
if (Status == DeviceHookStatus.Uninstalled && !Disposing)
{
throw new SoftwareException("Mouse hook has not installed. Current Status is '{0}'", Status);
}
if (_hMouseHook != IntPtr.Zero)
{
if (!WinAPI.USER32.UnhookWindowsHookEx(_hMouseHook) && !Disposing)
{
throw new WindowsException(WinAPI.KERNEL32.GetLastError(), "Windows did not allow the application to uninstall mouse hook.");
}
}
_hMouseHook = IntPtr.Zero;
_mouseHookProcedure = null;
Status = DeviceHookStatus.Uninstalled;
}
