I'm trying to write a simple app that counts every mouse click that occurs in Windows (left and right separated), not only within a form. So far i did not have any success in finding such solution. Thanks!
You will need to use the Win32 Hook API to capture mouse events. Stephen Toub provides a nice bit of sample code on his MSDN blog post about setting up a mouse hook.
class InterceptMouse
{
private static LowLevelMouseProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public static void Main()
{
_hookID = SetHook(_proc);
Application.Run();
UnhookWindowsHookEx(_hookID);
}
private static IntPtr SetHook(LowLevelMouseProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_MOUSE_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 &&
MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
{
MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
Console.WriteLine(hookStruct.pt.x + ", " + hookStruct.pt.y);
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private const int WH_MOUSE_LL = 14;
private enum MouseMessages
{
WM_LBUTTONDOWN = 0x0201,
WM_LBUTTONUP = 0x0202,
WM_MOUSEMOVE = 0x0200,
WM_MOUSEWHEEL = 0x020A,
WM_RBUTTONDOWN = 0x0204,
WM_RBUTTONUP = 0x0205
}
[StructLayout(LayoutKind.Sequential)]
private struct POINT
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
private struct MSLLHOOKSTRUCT
{
public POINT pt;
public uint mouseData;
public uint flags;
public uint time;
public IntPtr dwExtraInfo;
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
LowLevelMouseProc 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);
}
In your code you would set this up to record WM_LBUTTONDOWN and WM_RBUTTONDOWN events.
Related
I am currently developing an operating system using the MOSA-OS compiler to compile CIL to machine code. Unfortunately, while developing an operating system it is not so simple to just "Console.ReadLine" to get input. Nothing from System.Console is working, and I can't use WinForms either. Is there an alternative way to get keypresses/input?
Hooking into the user32.dll is a great way. Here is a low-level keyboard listener that will do the job. All you need to do is call HookKeyboard() and listen for the OnKeyPressed event.
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Input;
namespace DesktopWPFAppLowLevelKeyboardHook
{
public class LowLevelKeyboardListener
{
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private const int WM_SYSKEYDOWN = 0x0104;
[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);
public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
public event EventHandler<KeyPressedArgs> OnKeyPressed;
private LowLevelKeyboardProc _proc;
private IntPtr _hookID = IntPtr.Zero;
public LowLevelKeyboardListener()
{
_proc = HookCallback;
}
public void HookKeyboard()
{
_hookID = SetHook(_proc);
}
public void UnHookKeyboard()
{
UnhookWindowsHookEx(_hookID);
}
private IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
if (OnKeyPressed != null) { OnKeyPressed(this, new KeyPressedArgs(KeyInterop.KeyFromVirtualKey(vkCode))); }
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
}
public class KeyPressedArgs : EventArgs
{
public Key KeyPressed { get; private set; }
public KeyPressedArgs(Key key)
{
KeyPressed = key;
}
}
}
I am attempting to create a program to globally detect key presses and mouse clicks. I have googled around and found solutions for both and got them working in the same program. But I would like to combine the two separate classes into one class that does both. I have fiddled around with it for a bit and can't figure out how to do it. Does anyone know how to solve this? Thanks in advance!
Mouse clicks class:
public static class MouseHook
{
public static event EventHandler imputAction = delegate { };
public static void Start()
{
_hookID = SetHook(_proc);
}
public static void stop()
{
UnhookWindowsHookEx(_hookID);
}
private static LowLevelMouseProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
private static IntPtr SetHook(LowLevelMouseProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_MOUSE_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
{
MyGlobals.clickType = 1;
imputAction(null, new EventArgs());
}
if (nCode >= 0 && MouseMessages.WM_RBUTTONDOWN == (MouseMessages)wParam)
{
MyGlobals.clickType = 2;
imputAction(null, new EventArgs());
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private const int WH_MOUSE_LL = 14;
private enum MouseMessages
{
WM_LBUTTONDOWN = 0x0201,
WM_RBUTTONDOWN = 0x0204,
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
LowLevelMouseProc 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);
}
Keyboard class:
class InterceptKeys
{
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public static event EventHandler imputAction = delegate { };
public static void Start()
{
_hookID = SetHook(_proc);
}
public static void stop()
{
UnhookWindowsHookEx(_hookID);
}
private static IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelKeyboardProc(
int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
MyGlobals.characters = Convert.ToString((Keys)vkCode);
MyGlobals.clickType = 3;
imputAction(null, new EventArgs());
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
[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);
}
I am starting these like this:
MouseHook.Start();
MouseHook.MouseAction += new EventHandler(Event);
InterceptKeys.Start();
InterceptKeys.MouseAction += new EventHandler(Event)
The function receiving both events:
private void Event(object sender, EventArgs e)
{
//do stuff
}
I am also trying to do scrolling, I got it to detect scrolling by adding these lines. But I can't figure out how to read the scroll direction or value and assign it to a variable.
WM_MOUSEWHEEL = 0x020A,
if (nCode >= 0 && MouseMessages.WM_MOUSEWHEEL == (MouseMessages)wParam)
{
MyGlobals.imputType = 4;
// Here is where I need to set a variable to the direction or
// value of scrolling but I cant figure out how
imputAction(null, new EventArgs());
}
While my C# WinForms app is running, I need to detect when the mouse pointer is moved over a 3rd party application.
I've done some Google'ing but I can't seem to find a useful code example that shows how to set up a Hook Procedure to another application using C# to detect Windows Messages.
Can someone please show me how to setup a C# hook procedure so I can detect the WM_MOUSEMOVE message on another app (e.g. Notepad.exe)?
Below is the C# Low Level Mouse Hook code I was looking for, from the blogs.msdn.com/b/toub/archive/2006/05/03/589468.aspx link (that David Heffernan posted)
class InterceptMouse
{
private static LowLevelMouseProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public static void Main()
{
_hookID = SetHook(_proc);
Application.Run();
UnhookWindowsHookEx(_hookID);
}
private static IntPtr SetHook(LowLevelMouseProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_MOUSE_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 &&
MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
{
MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
Console.WriteLine(hookStruct.pt.x + ", " + hookStruct.pt.y);
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private const int WH_MOUSE_LL = 14;
private enum MouseMessages
{
WM_LBUTTONDOWN = 0x0201,
WM_LBUTTONUP = 0x0202,
WM_MOUSEMOVE = 0x0200,
WM_MOUSEWHEEL = 0x020A,
WM_RBUTTONDOWN = 0x0204,
WM_RBUTTONUP = 0x0205
}
[StructLayout(LayoutKind.Sequential)]
private struct POINT
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
private struct MSLLHOOKSTRUCT
{
public POINT pt;
public uint mouseData;
public uint flags;
public uint time;
public IntPtr dwExtraInfo;
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
LowLevelMouseProc 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);
}
I have two pieces of code which are very similar in that they register global hooks.
Registering global keyboard hook:
public class KeyboardHook : IDisposable
{
#region Events
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void HookEventHandler(object sender, KeyboardHookEventArgs e);
public event HookEventHandler KeyDown;
public event HookEventHandler KeyUp;
#endregion
#region Constants
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private const int WM_SYSKEYDOWN = 0x0104;
private LowLevelKeyboardProc _proc = null;
private static IntPtr _hookID = IntPtr.Zero;
#endregion
#region Imports
[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 Constructor
public KeyboardHook()
{
_proc = new LowLevelKeyboardProc(HookCallback);
_hookID = SetHook(_proc);
}
#endregion
#region Methods
private IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
//if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
if (nCode >= 0 && (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN))
{
int vkCode = Marshal.ReadInt32(lParam);
WinForms.Keys key = (WinForms.Keys)vkCode;
if (this.KeyDown != null)
this.KeyDown(this, new KeyboardHookEventArgs(vkCode));
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
#endregion
#region Destructor
public void Dispose()
{
UnhookWindowsHookEx(_hookID);
}
#endregion
}
Registering global shell hook:
public enum ShellEvents
{
HSHELL_WINDOWCREATED = 1,
HSHELL_WINDOWDESTROYED = 2,
HSHELL_ACTIVATESHELLWINDOW = 3,
HSHELL_WINDOWACTIVATED = 4,
HSHELL_GETMINRECT = 5,
HSHELL_REDRAW = 6,
HSHELL_TASKMAN = 7,
HSHELL_LANGUAGE = 8,
HSHELL_ACCESSIBILITYSTATE = 11
}
public class ShellHook
{
#region Events
private delegate IntPtr ShellProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void HookEventHandler(object sender, ShellHookEventArgs e);
public event HookEventHandler WindowActivated;
#endregion
#region Constants
private const int WH_SHELL = 10;
private ShellProc _proc = null;
private static IntPtr _hookID = IntPtr.Zero;
#endregion
#region Imports
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
ShellProc 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);
[DllImport("user32.dll")]
static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);
#endregion
#region Fields
#endregion
#region Constructor
public ShellHook()
{
_proc = new ShellProc(HookCallback);
_hookID = SetHook(_proc);
}
#endregion
#region Methods
private IntPtr SetHook(ShellProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_SHELL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam.Equals(ShellEvents.HSHELL_WINDOWACTIVATED))
{
string windowTitle = GetWindowTitle(wParam);
if (this.WindowActivated != null)
this.WindowActivated(this, new ShellHookEventArgs(windowTitle));
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private string GetWindowTitle(IntPtr hWnd)
{
const int nChars = 256;
StringBuilder Buff = new StringBuilder(nChars);
if (GetWindowText(hWnd, Buff, nChars) > 0)
{
return Buff.ToString();
}
return null;
}
#endregion
#region Destructor
public void Dispose()
{
UnhookWindowsHookEx(_hookID);
}
#endregion
}
For some reason, the keyboard hook works, but the shell hook fails (SetWindowsHookEx returns 0 and the callback is never reached).
Any ideas why?
I think I'll answer my own question. This quote from pinvoke.net explains why...
However, you cannot implement global hooks in Microsoft .NET Framework
except low level hooks. To install a global hook, a hook must have a
native dynamic-link library (DLL) export to inject itself in another
process that requires a valid, consistent function to call into. This
requires a DLL export, which .NET Framework does not support. Managed
code has no concept of a consistent value for a function pointer
because these function pointers are proxies that are built
dynamically.
I will be grateful to anybody who could help!
I'm using the InterceptKeys class below to change some of the keys. For example when I type the open bracket key "[", I want to change this to "ë" (whenever I type in my computer, not a particular program).
I use a SendKey.Send("ë"); whenever the "[" is typed, but the problem is that after "ë" alsot the "[" is typed.
Is it possible to replace the "[" with "ë" or any key, or cancel the "[" and just send "ë"?
class InterceptKeys
{
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public static void Main()
{
_hookID = SetHook(_proc);
Application.Run();
UnhookWindowsHookEx(_hookID);
}
private static IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelKeyboardProc(
int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
//Console.WriteLine((Keys)vkCode);
if (vkCode == (int)Keys.OemOpenBrackets))
{
SendKeys.Send("ë");
}
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
[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);
}
Return 1 if you handled the key instead of calling CallNextHookEx.
IE, HookCallback() should look like this
private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
//Console.WriteLine((Keys)vkCode);
if (vkCode == (int)Keys.OemOpenBrackets))
{
SendKeys.Send("ë");
return 1;
}
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}