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@vbfox
Created November 4, 2011 15:54
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Globally disable the conversion of touch events to mouse events in Windows 7
namespace BlackFox
{
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Security;
/// <summary>
/// As long as this object exists all mouse events created from a touch event for legacy support will be disabled.
/// </summary>
class DisableTouchConversionToMouse : IDisposable
{
static readonly LowLevelMouseProc hookCallback = HookCallback;
static IntPtr hookId = IntPtr.Zero;
public DisableTouchConversionToMouse()
{
hookId = SetHook(hookCallback);
}
static IntPtr SetHook(LowLevelMouseProc proc)
{
var moduleHandle = UnsafeNativeMethods.GetModuleHandle(null);
var setHookResult = UnsafeNativeMethods.SetWindowsHookEx(WH_MOUSE_LL, proc, moduleHandle, 0);
if (setHookResult == IntPtr.Zero)
{
throw new Win32Exception();
}
return setHookResult;
}
delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
var info = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
var extraInfo = (uint)info.dwExtraInfo.ToInt32();
if ((extraInfo & MOUSEEVENTF_FROMTOUCH) == MOUSEEVENTF_FROMTOUCH)
{
return new IntPtr(1);
}
}
return UnsafeNativeMethods.CallNextHookEx(hookId, nCode, wParam, lParam);
}
bool disposed;
public void Dispose()
{
if (disposed) return;
UnsafeNativeMethods.UnhookWindowsHookEx(hookId);
disposed = true;
GC.SuppressFinalize(this);
}
~DisableTouchConversionToMouse()
{
Dispose();
}
#region Interop
// ReSharper disable InconsistentNaming
// ReSharper disable MemberCanBePrivate.Local
// ReSharper disable FieldCanBeMadeReadOnly.Local
const uint MOUSEEVENTF_FROMTOUCH = 0xFF515700;
const int WH_MOUSE_LL = 14;
[StructLayout(LayoutKind.Sequential)]
struct POINT
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
struct MSLLHOOKSTRUCT
{
public POINT pt;
public uint mouseData;
public uint flags;
public uint time;
public IntPtr dwExtraInfo;
}
[SuppressUnmanagedCodeSecurity]
static class UnsafeNativeMethods
{
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc 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);
}
// ReSharper restore InconsistentNaming
// ReSharper restore FieldCanBeMadeReadOnly.Local
// ReSharper restore MemberCanBePrivate.Local
#endregion
}
}
@ulatekh
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ulatekh commented May 25, 2016

From what I can tell (running under Windows 7), touch-events converted to mouse-events are NOT reported under WH_MOUSE_LL, but instead are reported under WH_MOUSE. So I modified this code to hook into both types of events, and return new IntPtr(1) when a mouse-event created from a touch-event has been detected. Unfortunately, the system cursor is still moved to the position of the last touch. (My goal is similar to @tavoe; I want to allow one user to interact with a window using touch, and another user to interact with a different window using the mouse, on the same computer.)

Also, the call to ToInt32() on line 41 will break in a 64-bit process. One should test whether IntPtr.Size is 4 or 8, and if the latter, call ToInt64() instead.

I've forked this gist & submitted my changes.

@SaveTheHuman5
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Same as @tavoe and @ulatekh

Windows seems to automatically jump the mouse to the first touch (as you have observed).

I want prevent that happen and cant find the way.

Somebody have some news about this?

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