Office Addin 2013中的C#全局键盘挂钩

Question

我遇到了一个问题，让我的Office Addin在Powerpoint 2013上与我的全局键盘一起工作，但在以前的版本（2007和2010）上却不能
我没有得到任何异常，但似乎在Powerpoint 2013上从未触发过OnKeyDown事件，我不知道为什么。

我在所有版本的Windows（XP，7，8&8.1）上都遇到了同样的问题，在32&64位环境。Microsoft Office的版本为32位。

这是一个代码示例：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using PowerPoint = Microsoft.Office.Interop.PowerPoint;
using Office = Microsoft.Office.Core;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace testHook
{
    public partial class ThisAddIn
    {
        Hook hook;
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            hook = new Hook(Hook.HookType.KeyBoard, Hook.HookVisibility.Global);
            hook.OnKeyDown += new KeyEventHandler(hook_OnKeyDown);
            hook.Start();
        }
        void hook_OnKeyDown(object sender, KeyEventArgs e)
        {
            MessageBox.Show(e.KeyCode.ToString());
        }
        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
            hook.Stop();
            hook = null;
        }
        #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
    class Hook
    {
        private IntPtr m_Hook = (IntPtr)0;
        private HookVisibility m_Visibility;
        private HookType m_HookType;
        private HookProc m_Proc;
        public enum HookType { KeyBoard };
        public enum KeyBoardEventType { KeyDown, KeyUp, SysKeyDown, SysKeyUp, KeyShift, KeyCapital, NumLock };
        public enum HookVisibility { Global, Local };
        private delegate IntPtr HookProc(int nCode, int wParam, IntPtr lParam);
        private KeyPressEventHandler m_onKeyPress;
        private KeyEventHandler m_onKeyUp;
        private KeyEventHandler m_onKeyDown;
        public event KeyPressEventHandler OnKeyPress
        {
            add
            {
                m_onKeyPress += value;
            }
            remove
            {
                m_onKeyPress -= value;
            }
        }
        public event KeyEventHandler OnKeyUp
        {
            add
            {
                m_onKeyUp += value;
            }
            remove
            {
                m_onKeyUp -= value;
            }
        }
        public event KeyEventHandler OnKeyDown
        {
            add
            {
                m_onKeyDown += value;
            }
            remove
            {
                m_onKeyDown -= value;
            }
        }
        #region DLLImport
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hmod, int dwThreadId);
        [DllImport("user32.dll")]
        private static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, IntPtr lParam);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        private static extern bool UnhookWindowsHookEx(IntPtr hHook);
        [DllImport("Kernel32.dll", SetLastError = true)]
        private static extern IntPtr GetModuleHandle(IntPtr lpModuleName);
        [DllImport("Kernel32.dll", SetLastError = true)]
        private static extern IntPtr GetModuleHandle(String lpModuleName);
        [DllImport("Kernel32.dll")]
        private static extern IntPtr GetCurrentThreadId();
        [DllImport("user32")]
        private static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern short GetKeyState(int vKey);
        [DllImport("user32")]
        private static extern int GetKeyboardState(byte[] pbKeyState);
        #endregion
        [StructLayout(LayoutKind.Sequential)]
        private class KeyboardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        public Hook(HookType H, HookVisibility H2)
        {
            m_HookType = H;
            m_Visibility = H2;
        }
        public bool Start()
        {
            if (m_HookType == HookType.KeyBoard)
                m_Proc = new HookProc(KeyProc);
            if (m_Visibility == HookVisibility.Global)
                m_Hook = SetWindowsHookEx(getHookType(m_HookType, m_Visibility), m_Proc, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
            else if (m_Visibility == HookVisibility.Local)
                m_Hook = SetWindowsHookEx(getHookType(m_HookType, m_Visibility), m_Proc, GetModuleHandle((IntPtr)0), (int)GetCurrentThreadId());
            if (m_Hook == (IntPtr)0)
                return false;
            return true;
        }
        public bool Stop()
        {
            return UnhookWindowsHookEx(m_Hook);
        }
        private int getHookType(HookType H, HookVisibility V)
        {
            if (H == HookType.KeyBoard && V == HookVisibility.Local)
                return 2;
            if (H == HookType.KeyBoard && V == HookVisibility.Global)
                return 13;
            else return -1;
        }
        private int getKeyBoardEventType(KeyBoardEventType K)
        {
            if (K == KeyBoardEventType.KeyDown)
                return 0x100;
            if (K == KeyBoardEventType.KeyUp)
                return 0x101;
            if (K == KeyBoardEventType.SysKeyDown)
                return 0x104;
            if (K == KeyBoardEventType.SysKeyUp)
                return 0x105;
            if (K == KeyBoardEventType.KeyShift)
                return 0x10;
            if (K == KeyBoardEventType.KeyCapital)
                return 0x14;
            if (K == KeyBoardEventType.NumLock)
                return 0x90;
            else return -1;
        }
        private IntPtr KeyProc(int nCode, int wParam, IntPtr lParam)
        {
            bool handled = false;
            if ((nCode >= 0) && (m_onKeyDown != null || m_onKeyUp != null || m_onKeyPress != null))
            {
                KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
                if (m_onKeyDown != null && (wParam == 0x100 || wParam == 0x104))
                {
                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                    KeyEventArgs e = new KeyEventArgs(keyData);
                    m_onKeyDown(this, e);
                    handled = handled || e.Handled;
                }
                if (m_onKeyPress != null && wParam == 0x100)
                {
                    bool isShift = ((GetKeyState(0x10) & 0x80) == 0x80 ? true : false);
                    bool isCapslock = (GetKeyState(0x14) != 0 ? true : false);
                    byte[] keyState = new byte[256];
                    GetKeyboardState(keyState);
                    byte[] inBuffer = new byte[2];
                    if (ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.scanCode, keyState, inBuffer, MyKeyboardHookStruct.flags) == 1)
                    {
                        char key = (char)inBuffer[0];
                        if ((isCapslock ^ isShift) && Char.IsLetter(key))
                            key = Char.ToUpper(key);
                        KeyPressEventArgs e = new KeyPressEventArgs(key);
                        m_onKeyPress(this, e);
                        handled = handled || e.Handled;
                    }
                }
                if (m_onKeyUp != null && (wParam == 0x101 || wParam == 0x105))
                {
                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                    KeyEventArgs e = new KeyEventArgs(keyData);
                    m_onKeyUp(this, e);
                    handled = handled || e.Handled;
                }
            }
            if (handled)
                return (IntPtr)1;
            else
                return CallNextHookEx(m_Hook, nCode, (IntPtr)wParam, (IntPtr)lParam);
        }
    }
}

我的应用程序需要在幻灯片放映期间触发事件，因为我有一些其他窗口在演示期间显示，我必须根据用户按下的键更新它们。我尝试了很多解决方案，但钩子是唯一能完美完成任务的。

我也尝试了本地键盘挂钩，而不是全局键盘挂钩。事实上，我认为这是使其工作的唯一方法，因为这是来自微软的错误，而不是来自代码。然而，我无法使本地版本在任何版本的Powerpoint上正常工作。

Answer 1

该问题不是Powerpoint特有的，它发生在任何Office产品中。我正在处理一个Outlook插件，并幻想这个问题。已向Microsoft报告（没有任何意外的答复）：https://social.msdn.microsoft.com/Forums/office/en-US/93d08ccc-9e77-4f72-9c51-477468d89681/keyboardhook-will-not-work-in-word-2013?forum=worddev

我已经能够做出一个"变通办法"：我注册了一个全局钩子和一个本地钩子（"线程"）。它是有效的，但当keyProc是本地的时，它被称为"奇怪的"，不尊重记录的参数：-wParam不是WM_*之一，而是直接包含vkCode-无法访问lParam（AccessViolation）据我所知，这是因为一些"翻译消息"处理。

我还调整了您的代码，以便能够捕捉ALT组合。

    private bool wParamAlt;
    private IntPtr KeyProc(int nCode, int wParam, IntPtr lParam)
    {
        bool handled = false;
        if ((nCode == 0) && (m_onKeyDown != null || m_onKeyUp != null || m_onKeyPress != null))
        {
            KeyboardHookStruct MyKeyboardHookStruct;
            if (wParam >= 0x100)
            {
                MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
                wParamAlt = false;
            }
            else
            {
                MyKeyboardHookStruct = new KeyboardHookStruct();
                MyKeyboardHookStruct.vkCode = wParam;
                if (wParamAlt)
                {
                    wParamAlt = (wParam == 18);
                    wParam = 0x104;
                }
                else
                {
                    wParamAlt = (wParam == 18);
                    wParam = 0x100;
                }
            }
            if (m_onKeyDown != null && (wParam == 0x100 || wParam == 0x104))
            {
                Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                if (wParam == 0x104)
                    keyData |= Keys.Alt;
                KeyEventArgs e = new KeyEventArgs(keyData);
                m_onKeyDown(this, e);
                handled = handled || e.Handled;
            }
            if (m_onKeyPress != null && wParam == 0x100)
            {
                bool isShift = ((GetKeyState(0x10) & 0x80) == 0x80 ? true : false);
                bool isCapslock = (GetKeyState(0x14) != 0 ? true : false);
                byte[] keyState = new byte[256];
                GetKeyboardState(keyState);
                byte[] inBuffer = new byte[2];
                if (ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.scanCode, keyState, inBuffer, MyKeyboardHookStruct.flags) == 1)
                {
                    char key = (char)inBuffer[0];
                    if ((isCapslock ^ isShift) && Char.IsLetter(key))
                        key = Char.ToUpper(key);
                    KeyPressEventArgs e = new KeyPressEventArgs(key);
                    m_onKeyPress(this, e);
                    handled = handled || e.Handled;
                }
            }
            if (m_onKeyUp != null && (wParam == 0x101 || wParam == 0x105))
            {
                Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                if (wParam == 0x105)
                    keyData |= Keys.Alt;
                KeyEventArgs e = new KeyEventArgs(keyData);
                m_onKeyUp(this, e);
                handled = handled || e.Handled;
            }
        }
        if (handled)
            return (IntPtr)1;
        else
            return CallNextHookEx(m_Hook, nCode, (IntPtr)wParam, (IntPtr)lParam);
    }