Initial commit: Complete open-source Decal rebuild
All 5 phases of the open-source Decal rebuild: Phase 1: 14 decompiled .NET projects (Interop.*, Adapter, FileService, DecalUtil) Phase 2: 10 native DLLs rewritten as C# COM servers with matching GUIDs - DecalDat, DHS, SpellFilter, DecalInput, DecalNet, DecalFilters - Decal.Core, DecalControls, DecalRender, D3DService Phase 3: C++ shims for Inject.DLL (D3D9 hooking) and LauncherHook.DLL Phase 4: DenAgent WinForms tray application Phase 5: WiX installer and build script 25 C# projects building with 0 errors. Native C++ projects require VS 2022 + Windows SDK (x86). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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erik
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265
Managed/Decal.DenAgent/TrayContext.cs
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265
Managed/Decal.DenAgent/TrayContext.cs
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using System;
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using System.Diagnostics;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using Microsoft.Win32;
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namespace Decal.DenAgent
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{
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/// <summary>
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/// Application context that manages the system tray icon and lobby injection timer.
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/// Replaces the MFC CTrayWnd class.
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/// </summary>
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internal sealed class TrayContext : ApplicationContext
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{
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private readonly NotifyIcon _trayIcon;
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private readonly Timer _lobbyTimer;
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private AgentForm _agentForm;
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// P/Invoke for window enumeration and DLL injection
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[DllImport("user32.dll")]
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private static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
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[DllImport("user32.dll", CharSet = CharSet.Auto)]
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private static extern int GetClassName(IntPtr hWnd, char[] lpClassName, int nMaxCount);
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[DllImport("user32.dll")]
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private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
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[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
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private static extern IntPtr CreateSemaphore(IntPtr lpAttributes, int lInitialCount,
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int lMaximumCount, string lpName);
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[DllImport("kernel32.dll")]
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private static extern bool CloseHandle(IntPtr hObject);
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// LauncherHook P/Invoke
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[DllImport("LauncherHook.dll", CallingConvention = CallingConvention.StdCall)]
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private static extern void LauncherHookEnable();
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[DllImport("LauncherHook.dll", CallingConvention = CallingConvention.StdCall)]
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private static extern void LauncherHookDisable();
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// Inject.DLL injection via CreateRemoteThread
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[DllImport("kernel32.dll", SetLastError = true)]
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private static extern IntPtr OpenProcess(uint dwDesiredAccess, bool bInheritHandle, uint dwProcessId);
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[DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
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private static extern IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress,
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uint dwSize, uint flAllocationType, uint flProtect);
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[DllImport("kernel32.dll", SetLastError = true)]
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private static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress,
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byte[] lpBuffer, uint nSize, out UIntPtr lpNumberOfBytesWritten);
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[DllImport("kernel32.dll")]
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private static extern IntPtr CreateRemoteThread(IntPtr hProcess, IntPtr lpThreadAttributes,
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uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, out uint lpThreadId);
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[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
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private static extern IntPtr GetModuleHandle(string lpModuleName);
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[DllImport("kernel32.dll", CharSet = CharSet.Ansi, ExactSpelling = true)]
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private static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
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[DllImport("kernel32.dll")]
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private static extern uint WaitForSingleObject(IntPtr hHandle, uint dwMilliseconds);
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[DllImport("kernel32.dll")]
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private static extern bool VirtualFreeEx(IntPtr hProcess, IntPtr lpAddress,
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uint dwSize, uint dwFreeType);
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private const uint PROCESS_ALL_ACCESS = 0x001F0FFF;
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private const uint MEM_COMMIT = 0x1000;
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private const uint MEM_RELEASE = 0x8000;
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private const uint PAGE_READWRITE = 0x04;
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private delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);
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public TrayContext()
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{
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// Store agent path in registry
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StoreAgentPath();
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// Create tray icon
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_trayIcon = new NotifyIcon
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{
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Text = "Decal Agent",
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Icon = LoadTrayIcon(),
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Visible = true,
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ContextMenuStrip = CreateContextMenu()
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};
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_trayIcon.DoubleClick += (s, e) => ShowAgentForm();
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// Start timer to detect lobby windows for injection
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_lobbyTimer = new Timer { Interval = 1000 };
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_lobbyTimer.Tick += OnLobbyTimerTick;
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_lobbyTimer.Start();
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}
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private static System.Drawing.Icon LoadTrayIcon()
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{
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// Try to load custom icon; fall back to default app icon
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string iconPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "decal.ico");
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if (File.Exists(iconPath))
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return new System.Drawing.Icon(iconPath);
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return System.Drawing.SystemIcons.Application;
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}
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private ContextMenuStrip CreateContextMenu()
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{
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var menu = new ContextMenuStrip();
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menu.Items.Add("Configure", null, (s, e) => ShowAgentForm());
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menu.Items.Add(new ToolStripSeparator());
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menu.Items.Add("Exit", null, (s, e) => ExitApplication());
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return menu;
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}
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private void ShowAgentForm()
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{
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if (_agentForm == null || _agentForm.IsDisposed)
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{
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_agentForm = new AgentForm();
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}
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_agentForm.Show();
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_agentForm.BringToFront();
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_agentForm.Activate();
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}
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private void StoreAgentPath()
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{
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try
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{
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string agentPath = AppDomain.CurrentDomain.BaseDirectory;
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if (agentPath.EndsWith(Path.DirectorySeparatorChar.ToString()))
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agentPath = agentPath.TrimEnd(Path.DirectorySeparatorChar);
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using var key = Registry.LocalMachine.CreateSubKey(@"SOFTWARE\Decal\Agent");
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key?.SetValue("AgentPath", agentPath);
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}
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catch
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{
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// May fail without admin rights - that's okay, path may already be set
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}
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}
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private void OnLobbyTimerTick(object sender, EventArgs e)
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{
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// Enumerate windows looking for lobby/launcher windows to inject into
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EnumWindows(OnEnumWindow, IntPtr.Zero);
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}
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private bool OnEnumWindow(IntPtr hWnd, IntPtr lParam)
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{
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var className = new char[256];
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int len = GetClassName(hWnd, className, className.Length);
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string name = new string(className, 0, len);
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// Look for Asheron's Call lobby window class
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if (name != "ZoneLobbyWindow")
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return true;
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GetWindowThreadProcessId(hWnd, out uint processId);
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if (processId == 0)
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return true;
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// Check if already injected via named semaphore
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string semName = $"__LOBBYHOOK_{processId}";
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IntPtr hSem = CreateSemaphore(IntPtr.Zero, 0, 1, semName);
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if (hSem != IntPtr.Zero)
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{
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bool alreadyExists = Marshal.GetLastWin32Error() == 183; // ERROR_ALREADY_EXISTS
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CloseHandle(hSem);
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if (alreadyExists)
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return true;
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}
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// Inject LauncherHook.DLL into the lobby process
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string agentPath = GetAgentPath();
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if (!string.IsNullOrEmpty(agentPath))
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{
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string hookDll = Path.Combine(agentPath, "LauncherHook.dll");
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if (File.Exists(hookDll))
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InjectDll(processId, hookDll);
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}
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return true;
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}
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private static string GetAgentPath()
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{
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try
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{
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using var key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Decal\Agent");
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return key?.GetValue("AgentPath") as string ?? "";
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}
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catch { return ""; }
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}
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private static bool InjectDll(uint processId, string dllPath)
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{
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IntPtr hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, processId);
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if (hProcess == IntPtr.Zero)
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return false;
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try
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{
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byte[] pathBytes = System.Text.Encoding.Unicode.GetBytes(dllPath + '\0');
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uint pathSize = (uint)pathBytes.Length;
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IntPtr remoteMem = VirtualAllocEx(hProcess, IntPtr.Zero, pathSize, MEM_COMMIT, PAGE_READWRITE);
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if (remoteMem == IntPtr.Zero)
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return false;
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if (!WriteProcessMemory(hProcess, remoteMem, pathBytes, pathSize, out _))
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{
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VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
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return false;
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}
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IntPtr kernel32 = GetModuleHandle("kernel32.dll");
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IntPtr loadLibW = GetProcAddress(kernel32, "LoadLibraryW");
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IntPtr hThread = CreateRemoteThread(hProcess, IntPtr.Zero, 0,
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loadLibW, remoteMem, 0, out _);
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if (hThread == IntPtr.Zero)
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{
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VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
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return false;
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}
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WaitForSingleObject(hThread, 10000);
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CloseHandle(hThread);
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VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
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return true;
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}
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finally
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{
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CloseHandle(hProcess);
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}
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}
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private void ExitApplication()
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{
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_lobbyTimer.Stop();
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_lobbyTimer.Dispose();
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_trayIcon.Visible = false;
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_trayIcon.Dispose();
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Application.Exit();
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}
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protected override void Dispose(bool disposing)
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{
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if (disposing)
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{
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_lobbyTimer?.Dispose();
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_trayIcon?.Dispose();
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_agentForm?.Dispose();
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}
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base.Dispose(disposing);
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}
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}
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}
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