I'm still having a problem with my keyboard hook. It just isn't working. The debug method successfully outputs values, but I'm not sure what else I can do to trace where it's going wrong.
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Diagnostics;
namespace GlobalHooks
{
public class InterceptKeys
{
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static IntPtr _hookID = IntPtr.Zero;
private static String keysHooked = String.Empty;
private static LowLevelHookProc keyboardHook;
public delegate IntPtr LowLevelHookProc(int nCode, Int32 wParam, IntPtr lParam);
public delegate void KeyboardHandleFunction(int vkCode);
public static event KeyboardHandleFunction keyHookReturn;
public InterceptKeys(KeyboardHandleFunction func)
{
keyHookReturn = func;
keyboardHook = new LowLevelHookProc(this.HookCallback);
}
public static void debug()
{
Console.Write("\n[Success!] _hookID: "+_hookID);
Console.Write("\n[Success!] keyboardProc: "+keyboardHook.ToString());
}
private IntPtr SetupHook(LowLevelHookProc keyProcess)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, keyProcess,
GetModuleHandle(curModule.ModuleName), 0);
}
}
public void Hook()
{
_hookID = SetupHook(keyboardHook);
debug();
}
public void Unhook()
{
UnhookWindowsHookEx(_hookID);
}
public static void OnCallbackReturn(int nCode)
{
if (keyHookReturn != null)
{
keyHookReturn(nCode);
}
else
{
throw new Exception();
}
}
private IntPtr HookCallback(int nCode, Int32 wParam, IntPtr lParam)
{
Console.WriteLine("Calledback");
if (nCode >= 0 && wParam == WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
Console.WriteLine((Keys)vkCode);
OnCallbackReturn(nCode);
}
return CallNextHookEx((int)_hookID, nCode, wParam, lParam);
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelHookProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(int hhk, int nCode, int wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
}
}