InterceptKeys()
{
keyStream = Observable.Create<InterceptKeyEventArgs>(observer =>
{
Debug.Write("Subscribed to keys");
IntPtr hookId = IntPtr.Zero;
// Need to hold onto this callback, otherwise it will get GC'd as it is an unmanged callback
callback = (nCode, wParam, lParam) =>
{
if (nCode >= 0)
{
var eventArgs = CreateEventArgs(wParam, lParam);
observer.OnNext(eventArgs);
if (eventArgs.Handled)
return (IntPtr)1;
}
// ReSharper disable once AccessToModifiedClosure
return Win32Methods.CallNextHookEx(hookId, nCode, wParam, lParam);
};
hookId = SetHook(callback);
return Disposable.Create(() =>
{
Debug.Write("Unsubscribed from keys");
Win32Methods.UnhookWindowsHookEx(hookId);
callback = null;
});
})
.Publish().RefCount();
}
InterceptKeys()
{
keyStream = Observable.Create <InterceptKeyEventArgs>(observer =>
{
Debug.Write("Subscribed to keys");
IntPtr hookId = IntPtr.Zero;
// Need to hold onto this callback, otherwise it will get GC'd as it is an unmanged callback
callback = (nCode, wParam, lParam) =>
{
if (nCode >= 0)
{
var eventArgs = CreateEventArgs(wParam, lParam);
observer.OnNext(eventArgs);
if (eventArgs.Handled)
{
return((IntPtr)1);
}
}
// ReSharper disable once AccessToModifiedClosure
return(Win32Methods.CallNextHookEx(hookId, nCode, wParam, lParam));
};
hookId = SetHook(callback);
return(Disposable.Create(() =>
{
Debug.Write("Unsubscribed from keys");
Win32Methods.UnhookWindowsHookEx(hookId);
callback = null;
}));
})
.Publish().RefCount();
}
static IntPtr SetHook(Win32Methods.LowLevelKeyboardProc proc)
{
//TODO: This requires FullTrust to use the Process class - is there any options for doing this in MediumTrust?
//
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return(Win32Methods.SetWindowsHookEx(Win32Methods.WH_KEYBOARD_LL, proc, Win32Methods.GetModuleHandle(curModule.ModuleName), 0));
}
}
InterceptKeys(IDesktopLockEventService desktopLockEventService)
{
if (desktopLockEventService == null)
{
throw new ArgumentNullException("desktopLockEventService");
}
subject = new Subject <InterceptKeyEventArgs>();
callback = HookCallback;
this.desktopLockEventService = desktopLockEventService;
this.desktopLockEventService.DesktopUnlockedEvent += DesktopLockEventServiceDesktopUnlockEvent;
this.desktopLockEventService.DesktopUnlockedEvent += DesktopLockEventServiceDesktopLockEvent;
}
static IntPtr SetHook(Win32Methods.LowLevelKeyboardProc proc)
{
// NOTE: This requires FullTrust to use the Process class.
// There don't seem to be alternatives to achieving this in
// MediumTrust environment which is fine because that's a
// concept that has long been obsoleted. But just a warning
// if you ever try and run Carnac in that sort of way.
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return(Win32Methods.SetWindowsHookEx(Win32Methods.WH_KEYBOARD_LL, proc, Win32Methods.GetModuleHandle(curModule.ModuleName), 0));
}
}
InterceptKeys()
{
subject = new Subject <InterceptKeyEventArgs>();
callback = HookCallback;
}
