samuri25404
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 Posted: Mon Jan 28, 2008 6:51 pm Post subject: [C#] Static Keyboard Hook |
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EDIT:
I've edited it to, rather than for every one key, it would call the handler twice (on WM_(SYS)KEYDOWN and WM_(SYS)KEYUP), it only calls the handler once (on the WM_(SYS)KEYDOWN message).
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I've created a static keyboard hook and figured I'd go ahead and release it here.
EDIT:
I've made it a little more customizable. I've simply replaced what needed to be replaced in the code. Please PM me if I've missed something (i.e., the code doesn't build).
There are a couple steps to using this.
First Step:
Add a new class with this code (make sure to replace the "YOURNAMESPACE" with your actual namespace):
| Code: |
using System;
using System.Diagnostics;
//using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace TestKeybdHook
{
public static class Hook
{
//This class is based lightly off of the class found at the following website
//http://blogs.msdn.com/toub/archive/2006/05/03/589423.aspx
private static class API
{
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr SetWindowsHookEx(
int idHook,
HookDel lpfn,
IntPtr hMod,
uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UnhookWindowsHookEx(
IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr CallNextHookEx(
IntPtr hhk,
int nCode,
IntPtr
wParam,
IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr GetModuleHandle(
string lpModuleName);
}
public enum VK
{
//Keycodes recieved from this website:
//http://delphi.about.com/od/objectpascalide/l/blvkc.htm
//I've commented out the keys that I've never heard of--feel free to uncomment them if you wish
VK_LBUTTON = 0X01, //Left mouse
VK_RBUTTON = 0X02, //Right mouse
//VK_CANCEL = 0X03,
VK_MBUTTON = 0X04,
VK_BACK = 0X08, //Backspace
VK_TAB = 0X09,
//VK_CLEAR = 0X0C,
VK_RETURN = 0X0D, //Enter
VK_SHIFT = 0X10,
VK_CONTROL = 0X11, //CTRL
//VK_MENU = 0X12,
VK_PAUSE = 0X13,
VK_CAPITAL = 0X14, //Caps-Lock
VK_ESCAPE = 0X1B,
VK_SPACE = 0X20,
VK_PRIOR = 0X21, //Page-Up
VK_NEXT = 0X22, //Page-Down
VK_END = 0X23,
VK_HOME = 0X24,
VK_LEFT = 0X25,
VK_UP = 0X26,
VK_RIGHT = 0X27,
VK_DOWN = 0X28,
//VK_SELECT = 0X29,
//VK_PRINT = 0X2A,
//VK_EXECUTE = 0X2B,
VK_SNAPSHOT = 0X2C, //Print Screen
VK_INSERT = 0X2D,
VK_DELETE = 0X2E,
//VK_HELP = 0X2F,
VK_0 = 0X30,
VK_1 = 0X31,
VK_2 = 0X32,
VK_3 = 0X33,
VK_4 = 0X34,
VK_5 = 0X35,
VK_6 = 0X36,
VK_7 = 0X37,
VK_8 = 0X38,
VK_9 = 0X39,
VK_A = 0X41,
VK_B = 0X42,
VK_C = 0X43,
VK_D = 0X44,
VK_E = 0X45,
VK_F = 0X46,
VK_G = 0X47,
VK_H = 0X48,
VK_I = 0X49,
VK_J = 0X4A,
VK_K = 0X4B,
VK_L = 0X4C,
VK_M = 0X4D,
VK_N = 0X4E,
VK_O = 0X4F,
VK_P = 0X50,
VK_Q = 0X51,
VK_R = 0X52,
VK_S = 0X53,
VK_T = 0X54,
VK_U = 0X55,
VK_V = 0X56,
VK_W = 0X57,
VK_X = 0X58,
VK_Y = 0X59,
VK_Z = 0X5A,
VK_NUMPAD0 = 0X60,
VK_NUMPAD1 = 0X61,
VK_NUMPAD2 = 0X62,
VK_NUMPAD3 = 0X63,
VK_NUMPAD4 = 0X64,
VK_NUMPAD5 = 0X65,
VK_NUMPAD6 = 0X66,
VK_NUMPAD7 = 0X67,
VK_NUMPAD8 = 0X68,
VK_NUMPAD9 = 0X69,
VK_SEPERATOR = 0X6C, // | (shift + backslash)
VK_SUBTRACT = 0X6D, // -
VK_DECIMAL = 0X6E, // .
VK_DIVIDE = 0X6F, // /
VK_F1 = 0X70,
VK_F2 = 0X71,
VK_F3 = 0X72,
VK_F4 = 0X73,
VK_F5 = 0X74,
VK_F6 = 0X75,
VK_F7 = 0X76,
VK_F8 = 0X77,
VK_F9 = 0X78,
VK_F10 = 0X79,
VK_F11 = 0X7A,
VK_F12 = 0X7B, //I only went up to F12, because honestly, who the hell has 24 F buttons?
//and for the 8 people in the world who do, I think they can live without using them
VK_NUMLOCK = 0X90,
VK_SCROLL = 0X91, //Scroll-Lock
VK_LSHIFT = 0XA0,
VK_RSHIFT = 0XA1,
VK_LCONTROL = 0XA2,
VK_RCONTROL = 0XA3,
//VK_LMENU = 0XA4,
//VK_RMENU = 0XA5,
//VK_PLAY = 0XFA,
//VK_ZOOM = 0XFB
} //keycodes
public delegate IntPtr HookDel(
int nCode,
IntPtr wParam,
IntPtr lParam);
public delegate void KeyHandler(
IntPtr wParam,
IntPtr lParam);
private static IntPtr hhk = IntPtr.Zero;
private static HookDel hd;
private static KeyHandler kh;
public static void CreateHook(KeyHandler _kh)
{
Process _this = Process.GetCurrentProcess();
ProcessModule mod = _this.MainModule;
hd = HookFunc;
kh = _kh;
hhk = API.SetWindowsHookEx(13, hd, API.GetModuleHandle(mod.ModuleName), 0);
//13 is the parameter specifying that we're gonna do a low-level keyboard hook
//MessageBox.Show(Marshal.GetLastWin32Error().ToString()); //for debugging
//Note that this could be a Console.WriteLine(), as well. I just happened
//to be debugging this in a Windows Application
//to get the errors, in VS 2005+ (possibly before) do Tools -> Error Lookup
}
public static bool DestroyHook()
{
//to be called when we're done with the hook
return API.UnhookWindowsHookEx(hhk);
}
private static IntPtr HookFunc(
int nCode,
IntPtr wParam,
IntPtr lParam)
{
int iwParam = wParam.ToInt32();
if (nCode >= 0 &&
(iwParam == 0x100 ||
iwParam == 0x104)) //0x100 = WM_KEYDOWN, 0x104 = WM_SYSKEYDOWN
kh(wParam, lParam);
return API.CallNextHookEx(hhk, nCode, wParam, lParam);
}
}
}
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Second Step:
Removed--not needed.
Third Step:
Create a method with the return type void in your class to call the hook with code along the lines of this:
| Code: |
public static void KeyHandler(IntPtr wParam, IntPtr lParam)
{
int key = Marshal.ReadInt32(lParam);
Hook.VK vk = (Hook.VK)key;
switch(vk)
{
case Hook.VK.F5: MessageBox.Show("You pressed F5!");
break;
case Hook.VK.F6: MessageBox.Show("You pressed F6!");
break;
//etc...
default: break;
}
}
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Fourth Step
Whenever you decide to initialize the hook, simply call
| Code: |
Hook.CreateHook(METHODNAMEHERE);
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Where "METHODNAMEHERE" is the name of the method that you created in the 3rd step. When you're done with it, call
| Code: |
Hook.DestroyHook();
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If you want, you can create a non-static class so that you can create many keyboard hooks, but I'm not quite sure why one might want to do this--hence, I've created a static one.
_________________
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Oh jeez, watchout I'm a bias person! Locked. |
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