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- // This code is distributed under MIT license.
- // Copyright (c) 2015 George Mamaladze
- // See license.txt or https://mit-license.org/
-
- using System;
- using System.Runtime.InteropServices;
-
- namespace Gma.System.MouseKeyHook.WinApi
- {
- internal static class HookNativeMethods
- {
- /// <summary>
- /// The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.
- /// A hook procedure can call this function either before or after processing the hook information.
- /// </summary>
- /// <param name="idHook">This parameter is ignored.</param>
- /// <param name="nCode">[in] Specifies the hook code passed to the current hook procedure.</param>
- /// <param name="wParam">[in] Specifies the wParam value passed to the current hook procedure.</param>
- /// <param name="lParam">[in] Specifies the lParam value passed to the current hook procedure.</param>
- /// <returns>This value is returned by the next hook procedure in the chain.</returns>
- /// <remarks>
- /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
- /// </remarks>
- [DllImport("user32.dll", CharSet = CharSet.Auto,
- CallingConvention = CallingConvention.StdCall)]
- internal static extern IntPtr CallNextHookEx(
- IntPtr idHook,
- int nCode,
- IntPtr wParam,
- IntPtr lParam);
-
- /// <summary>
- /// The SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.
- /// You would install a hook procedure to monitor the system for certain types of events. These events
- /// are associated either with a specific thread or with all threads in the same desktop as the calling thread.
- /// </summary>
- /// <param name="idHook">
- /// [in] Specifies the type of hook procedure to be installed. This parameter can be one of the following values.
- /// </param>
- /// <param name="lpfn">
- /// [in] Pointer to the hook procedure. If the dwThreadId parameter is zero or specifies the identifier of a
- /// thread created by a different process, the lpfn parameter must point to a hook procedure in a dynamic-link
- /// library (DLL). Otherwise, lpfn can point to a hook procedure in the code associated with the current process.
- /// </param>
- /// <param name="hMod">
- /// [in] Handle to the DLL containing the hook procedure pointed to by the lpfn parameter.
- /// The hMod parameter must be set to NULL if the dwThreadId parameter specifies a thread created by
- /// the current process and if the hook procedure is within the code associated with the current process.
- /// </param>
- /// <param name="dwThreadId">
- /// [in] Specifies the identifier of the thread with which the hook procedure is to be associated.
- /// If this parameter is zero, the hook procedure is associated with all existing threads running in the
- /// same desktop as the calling thread.
- /// </param>
- /// <returns>
- /// If the function succeeds, the return value is the handle to the hook procedure.
- /// If the function fails, the return value is NULL. To get extended error information, call GetLastError.
- /// </returns>
- /// <remarks>
- /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
- /// </remarks>
- [DllImport("user32.dll", CharSet = CharSet.Auto,
- CallingConvention = CallingConvention.StdCall, SetLastError = true)]
- internal static extern HookProcedureHandle SetWindowsHookEx(
- int idHook,
- HookProcedure lpfn,
- IntPtr hMod,
- int dwThreadId);
-
- /// <summary>
- /// The UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx
- /// function.
- /// </summary>
- /// <param name="idHook">
- /// [in] Handle to the hook to be removed. This parameter is a hook handle obtained by a previous call to
- /// SetWindowsHookEx.
- /// </param>
- /// <returns>
- /// If the function succeeds, the return value is nonzero.
- /// If the function fails, the return value is zero. To get extended error information, call GetLastError.
- /// </returns>
- /// <remarks>
- /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
- /// </remarks>
- [DllImport("user32.dll", CharSet = CharSet.Auto,
- CallingConvention = CallingConvention.StdCall, SetLastError = true)]
- internal static extern int UnhookWindowsHookEx(IntPtr idHook);
- }
- }
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