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