Problems with Post/SendMessage to Diablo with c#

[peterk]

Hi,

i just begin to write my own "utility" for diablo 3 in C# and got an unexpected problem.

if i use SendMessage for the left or the right mouse button anything works. if i use the middle mouse button, the x/y coords are ignored and the position of the real mouse pointer is taken instead :confused:. PostMessage give the same results. (MiddleMouseButton is bind to move in diablo).

public void MMouseClick(short x, short y)
{
  IntPtr lParam = (IntPtr)((x & 0xFFFF) | ((y & 0xFFFF) << 16));
  const uint WM_MBUTTONDOWN = 0x0207;
  const uint WM_MBUTTONUP = 0x0208;
  SendMessage(hwnd, WM_MBUTTONDOWN, IntPtr.Zero, lParam);     // hwnd is an instance-var
  System.Threading.Thread.Sleep(50);
  SendMessage(hwnd, WM_MBUTTONUP, IntPtr.Zero, lParam);
}

Peter

[peterk]

i created a little demo, i can't believe that i am the only person with this problem.
the attachment is this source + gui with 4 buttons. you need visual c# to compile.
if you run it, set diablo to 800*600 windowed, i just click static screen positions.

if i change the 0x0207 to 0x0201 and 0x0208 to 0x0202 to use the left mouse button it works, but i want the middle button

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        IntPtr hwnd;

        [DllImport("user32")]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hwnd, uint message, IntPtr wParam, IntPtr lParam);

        public Form1()
        {
            InitializeComponent();
            hwnd = FindWindow(null, "Diablo III");
        }

        public void MMouseClick(short x, short y)
        {
            IntPtr lParam = (IntPtr)((x & 0xFFFF) | ((y & 0xFFFF) << 16));
            const uint WM_MBUTTONDOWN = 0x0207;                 // 0x0201 = left, 0x0204 = right, 0x0207 = middle
            const uint WM_MBUTTONUP = 0x0208;                   // 0x0202 = left, 0x0205 = right, 0x0208 = middle
            SendMessage(hwnd, WM_MBUTTONDOWN, IntPtr.Zero, lParam);
            System.Threading.Thread.Sleep(100);
            SendMessage(hwnd, WM_MBUTTONUP, IntPtr.Zero, lParam);
        }

        private void north_Click(object sender, EventArgs e)
        {
            MMouseClick(400, 200);
        }

        private void south_Click(object sender, EventArgs e)
        {
            MMouseClick(400, 400);
        }

        private void west_Click(object sender, EventArgs e)
        {
            MMouseClick(300, 300);
        }

        private void east_Click(object sender, EventArgs e)
        {
            MMouseClick(500, 300);
        }
    }
}

Peter