| 术语 | sysmsgproc |
| 释义 | SysMsgProc 语法： LRESULT CALLBACK SysMsgProc( int nCode, WPARAM wParam, LPARAM lParam ); SysMsgProc功能 该SysMsgProc挂钩过程是一个库定义的回调函数中调用SetWindowsHookEx函数使用。该系统要求输入事件后，这一职能发生在一个对话框，消息框，菜单或滚动条，但在此之前的输入事件所产生的信息处理。该功能可以监视任何对话框消息，消息框，菜单或滚动条在系统中。 在HOOKPROC类型定义一个指向这个回调函数。 SysMsgProc是一个应用程序的占位符定义或库定义的函数的名称。 参数 nCode [in]指定输入事件类型，产生的消息。如果nCode小于零，钩子程序必须通过信息，CallNextHookEx函数没有进一步的处理，并应归还CallNextHookEx返回的值。此参数可以是下列值之一。 MSGF_DIALOGBOX 输入事件发生在一个消息框或对话框。 MSGF_MENU 输入事件发生在一个菜单。 MSGF_SCROLLBAR 输入事件发生在一个滚动条。 wParam 此参数没有使用。 lparam的 [in]指向一个味精信息结构。 返回值 如果nCode小于零，钩子程序必须归还CallNextHookEx返回的值。 如果nCode大于或等于零，而挂钩程序并不处理消息，强烈建议您调用CallNextHookEx并返回返回值，否则，已经安装WH_SYSMSGFILTER其他应用程序挂钩将不会收到通知和钩可能行为不正确结果。如果挂钩过程处理的消息，则可能会返回一个非零值，以防止信息传递到目标窗口过程的系统。 备注 安装的应用程序通过指定WH_SYSMSGFILTER钩子类型和在调用指针挂钩过程的SetWindowsHookEx函数钩子程序。 功能信息 在Winuser.h中HeaderDeclared，头文件：winuser.h import libraryNone 最低操作系统Windows 95，Windows NT 3.1 参见 钩概述，CallNextHookEx，味精，调用SetWindowsHookEx ＝＝英文原文＝＝SysMsgProc Function The SysMsgProc hook procedure is a library-defined callback function used with the SetWindowsHookEx function. The system calls this function after an input event occurs in a dialog box, message box, menu, or scroll bar, but before the message generated by the input event is processed. The function can monitor messages for any dialog box, message box, menu, or scroll bar in the system. The HOOKPROC type defines a pointer to this callback function. SysMsgProc is a placeholder for the application-defined or library-defined function name. Syntax LRESULT CALLBACK SysMsgProc( int nCode, WPARAM wParam, LPARAM lParam ); Parameters nCode [in] Specifies the type of input event that generated the message. If nCode is less than zero, the hook procedure must pass the message to the CallNextHookEx function without further processing and should return the value returned by CallNextHookEx. This parameter can be one of the following values. MSGF_DIALOGBOX The input event occurred in a message box or dialog box. MSGF_MENU The input event occurred in a menu. MSGF_SCROLLBAR The input event occurred in a scroll bar. wParam This parameter is not used. lParam [in] Pointer to an MSG message structure. Return Value 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, and the hook procedure did not process the message, it is highly recommended that you call CallNextHookEx and return the value it returns; otherwise, other applications that have installed WH_SYSMSGFILTER hooks will not receive hook notifications and may behave incorrectly as a result. If the hook procedure processed the message, it may return a nonzero value to prevent the system from passing the message to the target window procedure. Remarks An application installs the hook procedure by specifying the WH_SYSMSGFILTER hook type and a pointer to the hook procedure in a call to the SetWindowsHookEx function. Function Information HeaderDeclared in Winuser.h, include Windows.h Import libraryNone Minimum operating systemsWindows 95, Windows NT 3.1 See Also Hooks Overview , CallNextHookEx , MSG , SetWindowsHookEx ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/ms644992(VS.85).aspx\n |
| 随便看 |
|
windows api函数参考手册包含2258条windows api函数文档，详细介绍nodejs、java、rust调用windows api的方法技巧，是学习windows api编程的入门中文文档。