如何在VSTO Words插件中访问KeyUp、KeyDown事件？

Question

如何在VSTO Words插件中访问KeyUp、KeyDown事件？

4

我的问题很简单，你可以说它是重复的，但它不是这样的。我想在使用C＃开发VisualStudio2015中的VSTO Words Add-In时检测按键事件，如KeyUp，KeyDown，并根据KeyCode运行其他功能。

根据MSDN文档，VSTO Add-In没有这样的事件，但他们提供了一些类似的事件，如Document.SelectionChange事件和ApplicationEvents4_Event.WindowSelectionChange事件，但它们不符合要求。

那么有没有办法以简单的方式使用C#使其符合我的问题...？

我所读的内容：

在StackOverflow上有许多相关的问题，但没有一个与我的问题相符。

我正在尝试:

我正在尝试使用一个简单的C#全局低级键盘钩子中分享的下面的代码，这个代码在点击Microsoft Word外部时可以正常工作，但是在Word中输入时无法捕获事件。我还想只捕获并运行自己的函数，而不想干扰他的函数，比如输入字母等。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Word = Microsoft.Office.Interop.Word;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Word;
// Added Extra Namespaces
using System.Windows.Forms;
using Utilities;

namespace WordAddIn1
{
    public partial class ThisAddIn
    {
        globalKeyboardHook gkh = new globalKeyboardHook();

        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            gkh.HookedKeys.Add(Keys.A);
            gkh.HookedKeys.Add(Keys.B);
            gkh.KeyDown += new KeyEventHandler(gkh_KeyDown);
            gkh.KeyUp += new KeyEventHandler(gkh_KeyUp);
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {                
            gkh.KeyDown -= new KeyEventHandler(gkh_KeyDown);
            gkh.KeyUp -= new KeyEventHandler(gkh_KeyUp);
        }        

        void gkh_KeyUp(object sender, KeyEventArgs e)
        {
            MessageBox.Show("Up\t" + e.KeyCode.ToString());
            e.Handled = true;
        }

        void gkh_KeyDown(object sender, KeyEventArgs e)
        {
            MessageBox.Show("Down\t" + e.KeyCode.ToString());
            e.Handled = true;
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }

        #endregion
    }
}

我的主类文件是...

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Utilities
{
    /// <summary>
    /// A class that manages a global low level keyboard hook
    /// </summary>
    class globalKeyboardHook
    {
        #region Constant, Structure and Delegate Definitions
        /// <summary>
        /// defines the callback type for the hook
        /// </summary>
        public delegate int keyboardHookProc(int code, int wParam, ref keyboardHookStruct lParam);

        public struct keyboardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        const int WH_KEYBOARD_LL = 13;
        const int WM_KEYDOWN = 0x100;
        const int WM_KEYUP = 0x101;
        const int WM_SYSKEYDOWN = 0x104;
        const int WM_SYSKEYUP = 0x105;
        #endregion

        #region Instance Variables
        /// <summary>
        /// The collections of keys to watch for
        /// </summary>
        public List<Keys> HookedKeys = new List<Keys>();
        /// <summary>
        /// Handle to the hook, need this to unhook and call the next hook
        /// </summary>
        IntPtr hhook = IntPtr.Zero;
        #endregion

        #region Events
        /// <summary>
        /// Occurs when one of the hooked keys is pressed
        /// </summary>
        public event KeyEventHandler KeyDown;
        /// <summary>
        /// Occurs when one of the hooked keys is released
        /// </summary>
        public event KeyEventHandler KeyUp;
        #endregion

        #region Constructors and Destructors
        /// <summary>
        /// Initializes a new instance of the <see cref="globalKeyboardHook"/> class and installs the keyboard hook.
        /// </summary>
        public globalKeyboardHook()
        {
            hook();
        }

        /// <summary>
        /// Releases unmanaged resources and performs other cleanup operations before the
        /// <see cref="globalKeyboardHook"/> is reclaimed by garbage collection and uninstalls the keyboard hook.
        /// </summary>
        ~globalKeyboardHook()
        {
            unhook();
        }
        #endregion

        #region Public Methods
        /// <summary>
        /// Installs the global hook
        /// </summary>
        public void hook()
        {
            IntPtr hInstance = LoadLibrary("User32");
            hhook = SetWindowsHookEx(WH_KEYBOARD_LL, hookProc, hInstance, 0);
        }

        /// <summary>
        /// Uninstalls the global hook
        /// </summary>
        public void unhook()
        {
            UnhookWindowsHookEx(hhook);
        }

        /// <summary>
        /// The callback for the keyboard hook
        /// </summary>
        /// <param name="code">The hook code, if it isn't >= 0, the function shouldn't do anyting</param>
        /// <param name="wParam">The event type</param>
        /// <param name="lParam">The keyhook event information</param>
        /// <returns></returns>
        public int hookProc(int code, int wParam, ref keyboardHookStruct lParam)
        {
            if (code >= 0)
            {
                Keys key = (Keys)lParam.vkCode;
                if (HookedKeys.Contains(key))
                {
                    KeyEventArgs kea = new KeyEventArgs(key);
                    if ((wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN) && (KeyDown != null))
                    {
                        KeyDown(this, kea);
                    }
                    else if ((wParam == WM_KEYUP || wParam == WM_SYSKEYUP) && (KeyUp != null))
                    {
                        KeyUp(this, kea);
                    }
                    if (kea.Handled)
                        return 1;
                }
            }
            return CallNextHookEx(hhook, code, wParam, ref lParam);
        }
        #endregion

        #region DLL imports
        /// <summary>
        /// Sets the windows hook, do the desired event, one of hInstance or threadId must be non-null
        /// </summary>
        /// <param name="idHook">The id of the event you want to hook</param>
        /// <param name="callback">The callback.</param>
        /// <param name="hInstance">The handle you want to attach the event to, can be null</param>
        /// <param name="threadId">The thread you want to attach the event to, can be null</param>
        /// <returns>a handle to the desired hook</returns>
        [DllImport("user32.dll")]
        static extern IntPtr SetWindowsHookEx(int idHook, keyboardHookProc callback, IntPtr hInstance, uint threadId);

        /// <summary>
        /// Unhooks the windows hook.
        /// </summary>
        /// <param name="hInstance">The hook handle that was returned from SetWindowsHookEx</param>
        /// <returns>True if successful, false otherwise</returns>
        [DllImport("user32.dll")]
        static extern bool UnhookWindowsHookEx(IntPtr hInstance);

        /// <summary>
        /// Calls the next hook.
        /// </summary>
        /// <param name="idHook">The hook id</param>
        /// <param name="nCode">The hook code</param>
        /// <param name="wParam">The wparam.</param>
        /// <param name="lParam">The lparam.</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        static extern int CallNextHookEx(IntPtr idHook, int nCode, int wParam, ref keyboardHookStruct lParam);

        /// <summary>
        /// Loads the library.
        /// </summary>
        /// <param name="lpFileName">Name of the library</param>
        /// <returns>A handle to the library</returns>
        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string lpFileName);
        #endregion
    }
}

- Sahar Jabeen

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Dirk Vollmar · Answer 1

如果您的VSTO插件中不使用低级挂钩，一切都应该正常工作。

有关工作示例，请参见以下问题的我的答案：

从VSTO插件检测Word 2016中的文本更改

在示例中，您需要调整挂钩回调函数以响应WM_KEYUP消息（当前示例仅对WM_KEYDOWN事件做出反应）。

如果您不想干扰键事件的默认行为（即仍然希望输入的文本出现等），则必须确保在任何情况下都调用CallNextHookEx（目前在您的代码中没有发生这种情况）。