问题
I encounter a problem to make my Office Addin works with my global keyboard on Powerpoint 2013 but not on the previous versions (2007 and 2010).
I do not get any exception but it seems that the OnKeyDown event is never triggered on Powerpoint 2013, and I don't know why.
I get the same problems on all versions of Windows (XP, 7, 8 & 8.1), on 32 & 64 bits environments. The version of Microsoft Office is 32 bits.
Here is a code sample :
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);
}
}
}
My application need to fire events during the slideshow because I have some others windows which are displayed during the presentation, and I have to update them according to the keys that the user presses. I have tried a lot of solutions but the hook is the only one that can do perfectly the job.
I tried too a local keyboard hook instead of a global one. I actually think that it is the only way to make it works because it is a bug from Microsoft, and not from the code. However, I can't make the local one works properly on any version of Powerpoint.
回答1:
The issue is not Powerpoint specific, it occurs with any Office product. I'm working on a Outlook addin and fancing this problem. It has been reported (without any answer unfortunely) to Microsoft: https://social.msdn.microsoft.com/Forums/office/en-US/93d08ccc-9e77-4f72-9c51-477468d89681/keyboardhook-will-not-work-in-word-2013?forum=worddev
I have been able to make a "workaround": i have register a Global Hook AND a Local one ("Thread"). It works, but the keyProc is called "weirdly" when it's local, not respecting documented parameters: - wParam is not one of WM_*, but contains directly the vkCode - lParam cannot be accessed (AccessViolation) As I understood, it's because some "TranslateMessage" processing.
I have also adapted your code to be able to catch ALT combination.
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);
}
来源：https://stackoverflow.com/questions/26401953/c-sharp-global-keyboard-hook-in-office-addin-2013