Discussion :

[NeoKript]

Bonjour a tous,

j'essay de me familiariser avec les hook, j'essay de faire un hook clavier mais rien ne se passe !

Code :

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using System.Reflection;
using System.Text;
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Collections;
using System.IO;
using System.Threading;
using System.Diagnostics;
using System.Windows.Forms;
 
namespace Hook
{
    class HookClavier
    {
        #region Import Dll
        [DllImport("user32.dll")]
        static extern IntPtr GetForegroundWindow();
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
        IntPtr wParam, IntPtr lParam);
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
        #endregion
        #region Variables
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private LowLevelKeyboardProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;
        #endregion
        #region Delegates
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
        #endregion
        public String CurrentWindowsTitle()
        {
            IntPtr p = GetForegroundWindow();
            if (p == IntPtr.Zero)
                return (String.Empty);
            StringBuilder d = new StringBuilder(256);
            GetWindowText(p, d, 256);
            return (Convert.ToString(d));
        }
        public static void Write()
        {
             try
            {
                    String Filename = "test.txt";
                    StreamWriter sw = new StreamWriter(System.IO.Path.Combine("C:\\", FileName), true, Encoding.Unicode);
                    sw.WriteLine("test");
                    sw.Close();
                }
            }
            catch (Exception)
            {
 
            }
        }
 
        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                Keys key = (Keys)vkCode;
                HookClavier.Write();
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }
 
        public void Start()
        {
            if (_hookID == IntPtr.Zero)
            {
                using (Process curProcess = Process.GetCurrentProcess())
                using (ProcessModule curModule = curProcess.MainModule)
                {
                    _hookID = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, GetModuleHandle(curModule.ModuleName), 0);
                }
            }
        }
        public void Stop()
        {
            if (_hookID != IntPtr.Zero)
                UnhookWindowsHookEx(_hookID);
        }
        public Boolean IsActivated
        {
            get
            {
                if (_hookID != IntPtr.Zero)
                    return (true);
                return (false);
            }
        }
    }
}

Mais rien ne sa passe je ne comprend pas pourquoi !
Si quelqu'un pouvait m'aiguiller ca serait chouette.

Merci.

Cordialement,
NeoKript

[theMonz31]

Mon aide : sur codeproject.com tu as un exemple de hook en C# qui fonctionne à merveille et qui présente un hook clavier / souris

[NeoKript]

Je l'ai essaye et je n'arrive malheureusement pas a le faire fonctionner !
Pour infos mon appli et une appli console et le hook ne doit bien évidement ne pas être bloquant !

[NeoKript]

Tu parle ce ce code : http://www.codeproject.com/KB/system...ystemhook.aspx ?

Ce qui m'embête c'est de passer par une Dll, est-on obligé ?

[NeoKript]

Savez-vous a quoi correspond l'erreur 126 de SetWindowsHookEx ?

Merci

[NeoKript]

Bonjours a tous,

je viens d'essayer le hook explique ici : http://humann.developpez.com/hook/

J'ai mis le tout dans une dll quand j'appelle StartKeyHook setWindowsHookEx retourne bien une valeur différentes de 0 mais apparemment on ne passe jamais dans la fonction de hook ...

Voici le code, si vous avez une idée !

Code :

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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Windows.Forms;
using System.IO;
 
namespace Hook
{
    public class Hook
    {
        #region Import DLL
 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        private static extern int UnhookWindowsHookEx(int idHook);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        private static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
        [DllImport("user32")]
        private static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
        [DllImport("user32")]
        private static extern int GetKeyboardState(byte[] pbKeyState);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern short GetKeyState(int vKey);
        #endregion
        #region Delegates
        private delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        #endregion
        #region Structures
        [StructLayout(LayoutKind.Sequential)]
        private class KeyboardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        #endregion
        #region Constantes
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x101;
        private const int WM_SYSKEYDOWN = 0x104;
        private const int WM_SYSKEYUP = 0x105;
        private const byte VK_SHIFT = 0x10;
        private const byte VK_CAPITAL = 0x14;
        private const byte VK_NUMLOCK = 0x90;
        #endregion
        #region Variables
        static Int32 _hook = 0;
        #endregion
        #region Hook Clavier
        public void Start()
        {
            if (_hook == 0)
            {
                HookProc KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                _hook = SetWindowsHookEx(
                    WH_KEYBOARD_LL,
                    KeyboardHookProcedure,
                    Marshal.GetHINSTANCE(
                    Assembly.GetExecutingAssembly().GetModules()[0]),
                    0);
            }
        }
        public void Stop()
        {
            if (_hook != 0)
            {
                UnhookWindowsHookEx(_hook);
            }
        }
 
        public Boolean Activated
        {
            get
            {
                if (_hook == 0)
                    return (false);
                return (true);
            }
        }
        private KeyPressEventHandler _onKeyPress;
 
        public event KeyPressEventHandler OnKeyPress
        {
            add
            {
                _onKeyPress += value;
            }
            remove
            {
                _onKeyPress -= value;
            }
        }
        private KeyEventHandler _onKeyUp;
 
        public event KeyEventHandler OnKeyUp
        {
            add
            {
                _onKeyUp += value;
            }
            remove
            {
                _onKeyUp -= value;
            }
        }
        private KeyEventHandler _onKeyDown;
 
        public event KeyEventHandler OnKeyDown
        {
            add
            {
                _onKeyDown += value;
            }
            remove
            {
                _onKeyDown -= value;
            }
        }
        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            bool handled = false;
            //On verifie si tous est ok
            StreamWriter s = new StreamWriter("C:\\Coucou.txt", true);
            s.Write("test");
            if ((nCode >= 0) && (_onKeyDown != null || _onKeyUp != null || _onKeyPress != null))
            {
                //Remplissage de la structure KeyboardHookStruct a partir d'un pointeur
                KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
                //KeyDown
                if (_onKeyDown != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
                {
                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                    KeyEventArgs e = new KeyEventArgs(keyData);
                    MessageBox.Show(Convert.ToString(keyData));
                    _onKeyDown(this, e);
                    handled = handled || e.Handled;
                }
 
                // KeyPress
                if (_onKeyPress != null && wParam == WM_KEYDOWN)
                {
                    // Si la touche Shift est appuyée
                    bool isShift = ((GetKeyState(VK_SHIFT) & 0x80) == 0x80 ? true : false);
                    // Si la touche CapsLock est appuyée
                    bool isCapslock = (GetKeyState(VK_CAPITAL) != 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);
                        _onKeyPress(this, e);
                        handled = handled || e.Handled;
                    }
                }
 
                // KeyUp
                if (_onKeyUp != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
                {
                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                    KeyEventArgs e = new KeyEventArgs(keyData);
                    _onKeyUp(this, e);
                    handled = handled || e.Handled;
                }
 
            }
 
            // si handled est a true, on ne transmet pas le message au destinataire
            if (handled)
                return 1;
            else
                return CallNextHookEx(_hook, nCode, wParam, lParam);
        }
 
        #endregion
 
    }
}

Merci d'avance,

Cordialement,
NeoKript