mirror of
https://github.com/greenshot/greenshot
synced 2025-07-14 17:13:44 -07:00
94 lines
4.1 KiB
C#
94 lines
4.1 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2014 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using GreenshotPlugin.UnmanagedHelpers;
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using GreenshotPlugin.Core;
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namespace Greenshot.Helpers {
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public class HookHelper {
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private static readonly log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(HookHelper));
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private static List<IntPtr> hooks = new List<IntPtr>();
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private static WinEventDelegate _winEventProc;
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private static uint oleEventThread = 0;
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/// <summary>
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/// Remove the made hooks
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/// </summary>
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public static void Unhook() {
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LOG.Debug("Cleaning winEvent hooks");
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foreach (IntPtr hook in hooks) {
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if (hook != IntPtr.Zero) {
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User32.UnhookWinEvent(hook);
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}
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}
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}
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/// <summary>
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/// Hook the WinEvents we are interested in
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/// </summary>
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public static void Hook() {
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LOG.Debug("Starting winEvent hooks");
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_winEventProc = new WinEventDelegate(WinEventProc);
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int processID = 0; //Process.GetCurrentProcess().Id;
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hooks.Add(User32.SetWinEventHook(WinEvent.EVENT_OBJECT_CREATE, WinEvent.EVENT_OBJECT_HIDE, IntPtr.Zero, _winEventProc, processID, 0, WinEventHookFlags.WINEVENT_SKIPOWNPROCESS));
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hooks.Add(User32.SetWinEventHook(WinEvent.EVENT_OBJECT_LOCATIONCHANGE, WinEvent.EVENT_OBJECT_LOCATIONCHANGE, IntPtr.Zero, _winEventProc, 0, 0, WinEventHookFlags.WINEVENT_SKIPOWNPROCESS));
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hooks.Add(User32.SetWinEventHook(WinEvent.EVENT_SYSTEM_MENUSTART, WinEvent.EVENT_SYSTEM_MENUPOPUPEND, IntPtr.Zero, _winEventProc, processID, 0, WinEventHookFlags.WINEVENT_SKIPOWNPROCESS));
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}
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/// <summary>
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/// Handle the WinEvent
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/// </summary>
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/// <param name="hWinEventHook">The Hook IntPtr</param>
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/// <param name="eventType">Event Type to handle, enum WinEvent</param>
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/// <param name="hwnd">Window handle which caused the event</param>
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/// <param name="idObject">Object ID, enum EventObjects</param>
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/// <param name="idChild">Child ID of the window</param>
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/// <param name="dwEventThread">Thread which generated the ID</param>
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/// <param name="dwmsEventTime"></param>
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private static void WinEventProc(IntPtr hWinEventHook, WinEvent eventType, IntPtr hwnd, EventObjects idObject, int idChild, uint dwEventThread, uint dwmsEventTime) {
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// Check if it's an event generated by a Window
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if (hwnd == IntPtr.Zero || idObject != EventObjects.OBJID_WINDOW) {
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// Other events do not interest us.
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return;
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}
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String classname = null;
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// Check if the event was generated by the OLE Event Thread, which causes a lot of create/destroy
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if (oleEventThread != 0 && dwEventThread == oleEventThread) {
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return;
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}
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// Only get the classname when it's not a destroy (classname is not available)
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if (eventType == WinEvent.EVENT_OBJECT_CREATE) {
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classname = WindowDetails.GetClassName(hwnd);
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// Make sure the OleMainThreadWndClass events are ignored.
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if (oleEventThread == 0) {
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if (classname == "OleMainThreadWndClass") {
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oleEventThread = dwEventThread;
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return;
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}
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}
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}
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LOG.DebugFormat("eventType={0},hwnd={1},classname={4},idObject={2},idChild={3},dwEventThread={5}", eventType, hwnd, idObject, idChild, classname, dwEventThread);
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}
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}
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}
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