我正在用 C# 编写一个使用原始输入的鼠标对象。该设备注册并获取数据和所有这些东西，所以它在这方面是有效的。然而，在这个对象上我有一个名为“Exclusive”的属性，它是为了模仿直接输入中的独占模式。

当我将此属性切换为 TRUE 时，我调用 RegisterRawInputDevices 并将 RAWINPUTDEVICE 的 dwFlags 成员设置为:RIDEV_CAPTUREMOUSE | RIDEV_NOLEGACY。当我将该属性设置为 FALSE 时，我将其设置为 0。

现在的问题是当我从鼠标按钮按下/向上事件执行此操作时。在我的鼠标对象上，我分配鼠标按钮按下事件以将 Exclusive 设置为 TRUE，而在鼠标弹起时我将其设置为 FALSE。当我运行应用程序时，事件会触发，独占模式会被设置和重置。这是奇怪的事情开始发生的地方:

1. 鼠标弹起事件和独占模式禁用后，窗口不响应窗口装饰中的鼠标悬停事件(例如，关闭按钮不会突出显示，我无法点击它) .我也无法通过按 ALT+F4 退出应用程序。但是，当我单击窗口一次或两次时，常规窗口行为又回来了。

2. 应用程序关闭后，Windows 资源管理器和其他应用程序窗口会做出相同的 react 。我必须多次左右单击才能使它们恢复正常。

3. 在极少数情况下，窗口会因为一些奇怪的原因而失去焦点。这让一切都陷入排他状态的困惑之中(代码设置为在窗口停用时解除绑定(bind)设备，并在再次激活时恢复它)。正如我之前所说，这是一种非常罕见的情况，但仍然存在很大问题。

当我使用按键按下和按键弹起事件设置/重置独占模式时，一切正常，并且以上都没有发生。这真是令人费解。

我已经在两台计算机上尝试过此代码，使用不同的鼠标，一台运行 Windows 7 x64，另一台运行 Windows 8.1 x64。

在过去的几天里，我对此进行了大量搜索，但一无所获，所以我想知道是否有人对它为何以这种方式运行有任何想法？我没有设置正确的标志吗？像这样一遍又一遍地调用 RegisterRawInputDevices 会导致问题吗？

这是我用来测试问题的示例程序的代码:

_mouse = _input.CreatePointingDevice(_form);
_keyboard = _input.CreateKeyboard(_form);

_mouse.PointingDeviceDown += (sender, args) =>
                             {
                                 if ((args.Buttons & PointingDeviceButtons.Right) != PointingDeviceButtons.Right)
                                 {
                                     return;
                                 }

                                 _mouse.Exclusive = true;
                             };

_mouse.PointingDeviceMove += (sender, args) =>
                             {
                                 _form.Text = string.Format("{0}x{1}", args.Position.X, args.Position.Y);
                             };

_mouse.PointingDeviceUp += (sender, args) =>
                           {
                               if ((args.Buttons & PointingDeviceButtons.Right) != PointingDeviceButtons.Right)
                               {
                                   return;
                               }

                               _mouse.CursorVisible = true;
                               _mouse.Exclusive = false;
                           };

这是我用来注册和取消注册鼠标的代码:

/// <summary>
/// Function to bind the input device.
/// </summary>
protected override void BindDevice()
{
    BoundControl.MouseLeave -= Owner_MouseLeave;

    UnbindDevice();

    if (_messageFilter != null)
    {
        _messageFilter.RawInputPointingDeviceData -= GetRawData;
        _messageFilter.RawInputPointingDeviceData += GetRawData;
    }

    _device.UsagePage = HIDUsagePage.Generic;
    _device.Usage = (ushort)HIDUsage.Mouse;
    _device.Flags = RawInputDeviceFlags.None;

    // Enable background access.
    if (AllowBackground)
    {
        _device.Flags |= RawInputDeviceFlags.InputSink;
    }

    // Enable exclusive access.
    if (Exclusive)
    {
        _device.Flags |= RawInputDeviceFlags.CaptureMouse | RawInputDeviceFlags.NoLegacy;
    }

    _device.WindowHandle = BoundControl.Handle;

    // Attempt to register the device.
    if (!Win32API.RegisterRawInputDevices(_device))
    {
        throw new GorgonException(GorgonResult.DriverError, Resources.GORINP_RAW_CANNOT_BIND_POINTING_DEVICE);
    }

    if (!Exclusive)
    {
        OnWindowBound(BoundControl);
    }
}

    /// <summary>
    /// Function to unbind the input device.
    /// </summary>
    protected override void UnbindDevice()
    {
        if (_messageFilter != null)
        {
            _messageFilter.RawInputPointingDeviceData -= GetRawData;
        }

        _device.UsagePage = HIDUsagePage.Generic;
        _device.Usage = (ushort)HIDUsage.Mouse;
        _device.Flags = RawInputDeviceFlags.Remove;
        _device.WindowHandle = IntPtr.Zero;

        // Attempt to register the device.
        if (!Win32API.RegisterRawInputDevices(_device))
        {
            throw new GorgonException(GorgonResult.DriverError, Resources.GORINP_RAW_CANNOT_UNBIND_POINTING_DEVICE);
        }

        BoundControl.MouseLeave -= Owner_MouseLeave;
    }

这是处理 WM_INPUT 消息的代码:

/// <summary>
/// Object representing a message loop filter.
/// </summary>
internal class MessageFilter
    : System.Windows.Forms.IMessageFilter
{
    #region Events.
    /// <summary>
    /// Event fired when a raw input keyboard event occours.
    /// </summary>
    public event EventHandler<RawInputKeyboardEventArgs> RawInputKeyboardData = null;
    /// <summary>
    /// Event fired when a pointing device event occurs.
    /// </summary>
    public event EventHandler<RawInputPointingDeviceEventArgs> RawInputPointingDeviceData = null;
    /// <summary>
    /// Event fired when an HID event occurs.
    /// </summary>
    public event EventHandler<RawInputHIDEventArgs> RawInputHIDData = null;
    #endregion

    #region Variables.
    private readonly int _headerSize = DirectAccess.SizeOf<RAWINPUTHEADER>();   // Size of the input data in bytes.
    #endregion

    #region IMessageFilter Members
    /// <summary>
    /// Filters out a message before it is dispatched.
    /// </summary>
    /// <param name="m">The message to be dispatched. You cannot modify this message.</param>
    /// <returns>
    /// true to filter the message and stop it from being dispatched; false to allow the message to continue to the next filter or control.
    /// </returns>
    public bool PreFilterMessage(ref System.Windows.Forms.Message m)
    {
        // Handle raw input messages.
        if ((WindowMessages)m.Msg != WindowMessages.RawInput)
        {
            return false;
        }

        unsafe
        {
            int dataSize = 0;

            // Get data size.           
            int result = Win32API.GetRawInputData(m.LParam, RawInputCommand.Input, IntPtr.Zero, ref dataSize, _headerSize);

            if (result == -1)
            {
                throw new GorgonException(GorgonResult.CannotRead, Resources.GORINP_RAW_CANNOT_READ_DATA);
            }

            // Get actual data.
            var rawInputPtr = stackalloc byte[dataSize];
            result = Win32API.GetRawInputData(m.LParam, RawInputCommand.Input, (IntPtr)rawInputPtr, ref dataSize, _headerSize);

            if ((result == -1) || (result != dataSize))
            {
                throw new GorgonException(GorgonResult.CannotRead, Resources.GORINP_RAW_CANNOT_READ_DATA);
            }

            var rawInput = (RAWINPUT*)rawInputPtr;

            switch (rawInput->Header.Type)
            {
                case RawInputType.Mouse:
                    if (RawInputPointingDeviceData != null)
                    {
                        RawInputPointingDeviceData(this,
                                                   new RawInputPointingDeviceEventArgs(rawInput->Header.Device, ref rawInput->Union.Mouse));
                    }
                    break;
                case RawInputType.Keyboard:
                    if (RawInputKeyboardData != null)
                    {
                        RawInputKeyboardData(this, new RawInputKeyboardEventArgs(rawInput->Header.Device, ref rawInput->Union.Keyboard));
                    }
                    break;
                default:
                    if (RawInputHIDData != null)
                    {
                        var HIDData = new byte[rawInput->Union.HID.Size * rawInput->Union.HID.Count];
                        var hidDataPtr = ((byte*)rawInput) + _headerSize + 8;

                        fixed (byte* buffer = &HIDData[0])
                        {
                            DirectAccess.MemoryCopy(buffer, hidDataPtr, HIDData.Length);
                        }

                        RawInputHIDData(this, new RawInputHIDEventArgs(rawInput->Header.Device, ref rawInput->Union.HID, HIDData));
                    }
                    break;
            }
        }

        return false;
    }
    #endregion
}

下面是处理 WM_INPUT 后触发鼠标事件的代码:

/// <summary>
/// Function to retrieve and parse the raw pointing device data.
/// </summary>
/// <param name="sender">Sender of the event.</param>
/// <param name="e">Event data to examine.</param>
private void GetRawData(object sender, RawInputPointingDeviceEventArgs e)
{
    if ((BoundControl == null) || (BoundControl.Disposing))
    {
        return;
    }

    if ((_deviceHandle != IntPtr.Zero) && (_deviceHandle != e.Handle))
    {
        return;
    }

    if ((Exclusive) && (!Acquired))
    {
        // Attempt to recapture.
        if (BoundControl.Focused)
        {
            Acquired = true;
        }
        else
        {
            return;
        }
    }

    // Do nothing if we're outside and we have exclusive mode turned off.
    if (!Exclusive)
    {
        if (!WindowRectangle.Contains(BoundControl.PointToClient(System.Windows.Forms.Cursor.Position))) 
        {
            _outside = true;
            return;
        }

        if (_outside) 
        {
            // If we're back inside place position at the entry point.
            _outside = false;
            Position = BoundControl.PointToClient(System.Windows.Forms.Cursor.Position);
        }
    }

    // Get wheel data.
    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.MouseWheel) != 0)
    {
        OnPointingDeviceWheelMove((short)e.PointingDeviceData.ButtonData);
    }

    // If we're outside of the delay, then restart double click cycle.
    if (_doubleClicker.Milliseconds > DoubleClickDelay)
    {
        _doubleClicker.Reset();
        _clickCount = 0;
    }

    // Get button data.
    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.LeftDown) != 0)
    {
        BeginDoubleClick(PointingDeviceButtons.Left);
        OnPointingDeviceDown(PointingDeviceButtons.Left);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.RightDown) != 0)
    {
        BeginDoubleClick(PointingDeviceButtons.Right);
        OnPointingDeviceDown(PointingDeviceButtons.Right);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.MiddleDown) != 0)
    {
        BeginDoubleClick(PointingDeviceButtons.Middle);
        OnPointingDeviceDown(PointingDeviceButtons.Middle);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.Button4Down) != 0)
    {
        BeginDoubleClick(PointingDeviceButtons.Button4);
        OnPointingDeviceDown(PointingDeviceButtons.Button4);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.Button5Down) != 0)
    {
        BeginDoubleClick(PointingDeviceButtons.Button5);
        OnPointingDeviceDown(PointingDeviceButtons.Button5);
    }

    // If we have an 'up' event on the buttons, remove the flag.
    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.LeftUp) != 0)
    {
        if (IsDoubleClick(PointingDeviceButtons.Left))
        {
            _clickCount += 1;
        }
        else
        {
            _doubleClicker.Reset();
            _clickCount = 0;
        }

        OnPointingDeviceUp(PointingDeviceButtons.Left, _clickCount);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.RightUp) != 0)
    {
        if (IsDoubleClick(PointingDeviceButtons.Right))
        {
            _clickCount += 1;
        }
        else
        {
            _doubleClicker.Reset();
            _clickCount = 0;
        }

        OnPointingDeviceUp(PointingDeviceButtons.Right, _clickCount);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.MiddleUp) != 0)
    {
        if (IsDoubleClick(PointingDeviceButtons.Middle))
        {
            _clickCount += 1;
        }
        else
        {
            _doubleClicker.Reset();
            _clickCount = 0;
        }

        OnPointingDeviceUp(PointingDeviceButtons.Middle, _clickCount);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.Button4Up) != 0)
    {
        if (IsDoubleClick(PointingDeviceButtons.Button4))
        {
            _clickCount += 1;
        }
        else
        {
            _doubleClicker.Reset();
            _clickCount = 0;
        }

        OnPointingDeviceUp(PointingDeviceButtons.Button4, _clickCount);
    }

    if ((e.PointingDeviceData.ButtonFlags & RawMouseButtons.Button5Up) != 0)
    {
        if (IsDoubleClick(PointingDeviceButtons.Button5))
        {
            _clickCount += 1;
        }
        else
        {
            _doubleClicker.Reset();
            _clickCount = 0;
        }

        OnPointingDeviceUp(PointingDeviceButtons.Button5, _clickCount);
    }

    // Fire events.
    RelativePosition = new PointF(e.PointingDeviceData.LastX, e.PointingDeviceData.LastY);
    OnPointingDeviceMove(new PointF(Position.X + e.PointingDeviceData.LastX, Position.Y + e.PointingDeviceData.LastY), false);
    UpdateCursorPosition();
}

最佳答案

好吧，经过几天拉扯我遗漏的小头发后，我找不到任何韵律或理由来解释为什么会发生这种情况。因此，我设计了一个相当丑陋的 hack 来伪造独占模式。

首先，我从设备注册中删除了 NOLEGACY 和 CAPTUREMOUSE 标志，然后我将光标锁定到通过 Cursor.Position 接收输入的窗口的中心。然后我修改了我的窗口消息过滤器以丢弃 WM_MOUSEMOVE 和 WM_KEYDOWN 之类的窗口消息，这样当设备处于独占模式时它们就不会被窗口拦截(处理 ALT+F4 的系统命令除外)。

虽然这不是最优雅的解决方案，但它的工作方式正是我想要的。但是，如果有人找到更好的方法来处理这种情况，同时仍然使用 NOLEGACY/CAPTUREMOUSE 标志，我会很乐意将其标记为正确答案。

关于c# - 切换 RIDEV_CAPTUREMOUSE 时的奇怪行为 | RIDEV_NOLEGACY，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25353236/