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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;
-
- namespace Gma.System.MouseKeyHook.WinApi
- {
- /// <summary>
- /// The CallWndProc hook procedure is an application-defined or library-defined callback
- /// function used with the SetWindowsHookEx function. The HOOKPROC type defines a pointer
- /// to this callback function. CallWndProc is a placeholder for the application-defined
- /// or library-defined function name.
- /// </summary>
- /// <param name="nCode">
- /// [in] Specifies whether the hook procedure must process the message.
- /// If nCode is HC_ACTION, the hook procedure must process the message.
- /// If nCode is less than zero, the hook procedure must pass the message to the
- /// CallNextHookEx function without further processing and must return the
- /// value returned by CallNextHookEx.
- /// </param>
- /// <param name="wParam">
- /// [in] Specifies whether the message was sent by the current thread.
- /// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
- /// </param>
- /// <param name="lParam">
- /// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
- /// </param>
- /// <returns>
- /// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
- /// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
- /// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
- /// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
- /// procedure does not call CallNextHookEx, the return value should be zero.
- /// </returns>
- /// <remarks>
- /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/callwndproc.asp
- /// </remarks>
- public delegate IntPtr HookProcedure(int nCode, IntPtr wParam, IntPtr lParam);
- }
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