HTML Help使用户能在一个帮助窗口中使用工具棒、查看目录和帮助主题。目前，有两种方法创建Tri-pane类型的HTML Help窗口：
使用HTML Help Workshop创建窗口
使用HTML Help API编程创建窗口
本文将介绍如何使用这两种方法创建Tri-pane HTML Help窗口。
使用预定义窗口
在HTML Help Workshop环境中很容易创建和修改工程的窗口定义，有关窗口定义的其它信息，请参考微软知识库文章：Q189084 HOWTO: Create a Tri-pane Window with HTML Help Workshop
本文假设在你的应用程序开发工具为 Visual C++，那么要在自己的程序中使用HTML Help帮助，必须借助于HTML Help提供的 API 函数；要调用这些 API 函数，就必须包含 htmlhelp.h 文件，并且将库文件 hhctrl.lib 或者 htmlhelp.lib 链接到自己的程序代码中。只要你安装了HTML Help Workshop环境，这 些文件存放在 HTML Help Workshop下的 \Include 和 \Lib 目录中。
在下面的示范代码中，sample.chm是一个编译好的HTML Help帮助文件，其中有一个叫“mywindow”的窗口定义， 下面的代码示范了如何在一个MFC程序中调用HTML Help API函数：
// CMainFrame message handler
void CMainFrame::OnHelp()
{
// display the topic "intro.htm" in the window defined
// in the HTML Help Workshop
HtmlHelp(m_hWnd,"sample.chm::\\intro.htm>mywindow",
HH_DISPLAY_TOPIC,0);
}
使用HTML Help API
为了创建three-pane窗口, 必须首先创建和填写HH_WINTYPE结构。HH_WINTYPE结构在HtmlHelp.h中定义,详细说明参见HTML Help Workshop文档。以下是一个例子:
Sample Code
///////////////////////////////////////////
// Create an HH_WINTYPE structure.
{
HH_WINTYPE m_hhWinType;
// Initialize all structure members to zero.
ZeroMemory(&m_hhWinType, sizeof(HH_WINTYPE));
// Define a custom message for use with idNotify.
// You are responsible for ensuring that this ID
// does not conflict with other Windows/MFC messages.
#define IDD_HELPTAB 69999
// Set the size of the structure.
m_hhWinType.cbStruct = sizeof(HH_WINTYPE);
// Set up the properties of the HTML window:
// tripane window, sync topic with index/TOC, and so forth.
// NOTE: fsValidMembers - HHWIN_PARAM_PROPERTIES must be set.
m_hhWinType.fsWinProperties = HHWIN_PROP_TRI_PANE |
HHWIN_PROP_AUTO_SYNC;
// Put BACK, HOME, FORWARD, and EXPAND buttons on toolbar pane.
// NOTE: fsValidMembers - HHWIN_PARAM_TB_FLAGS must be set.
m_hhWinType.fsToolBarFlags = HHWIN_BUTTON_BACK |
HHWIN_BUTTON_HOME | HHWIN_BUTTON_FORWARD |
HHWIN_BUTTON_EXPAND;
// The file is in the right pane. The full path is not needed.
m_hhWinType.pszFile = "intro.htm";
// Full Paths or CHM locations of various files (if used).
// To specify that a file is within a CHM, use the following
// syntax: "CHMFileName.chm::\\FileName.xxx"
// Home Page:
m_hhWinType.pszHome = "c:\\mypath\\intro.htm";
// Table of Contents:
m_hhWinType.pszToc = "c:\\mypath\\contents.hhc";
// Index:
m_hhWinType.pszIndex = "c:\\mypath\\index.hhk";
// Expansion width of navigation pane (left pane):
// NOTE: fsValidMembers - HHWIN_PARAM_NAV_WIDTH must be set.
m_hhWinType.iNavWidth = 175;
// Initial display state:
// NOTE: fsValidMembers - HHWIN_PARAM_SHOWSTATE must be set.
m_hhWinType.nShowState = SW_RESTORE;
// TOC should be activated.
// NOTE: fsValidMembers - HHWIN PARAM_CUR_TAB must be set.
m_hhWinType.curNavType = HHWIN_NAVTYPE_TOC;
// Tabs on top.
// NOTE: fsValidMembers - HHWIN_PARAM_TABPOS must be set.
m_hhWinType.tabpos = HHWIN_NAVTAB_TOP;
// ID to use in WPARAM in WM_NOTIFY:
m_hhWinType.idNotify = IDD_HELPTAB;
// Title of Help Window:
m_hhWinType.pszCaption= "My Title";
// Indicate which fields in structure are valid.
m_hhWinType.fsValidMembers = HHWIN_PARAM_STYLES |
HHWIN_PARAM_PROPERTIES | HHWIN_PARAM_RECT |
HHWIN_PARAM_TB_FLAGS | HHWIN_PARAM_NAV_WIDTH |
HHWIN_PARAM_SHOWSTATE | HHWIN_PARAM_TABPOS |
HHWIN_PARAM_CUR_TAB;
// Specify the name of the window definition.
m_hhWinType.pszType = "MyWindowName";
// This call creates the new type from the values in
// the HH_WINTYPE structure. This example assumes that
// a valid CHM file, "sample.chm", exists.
HtmlHelp (m_hWnd, "c:\\mypath\\sample.chm",
HH_SET_WIN_TYPE, (DWORD) &m_hhWinType);
}
// Display the default topic in the window that was defined above
// MFC''s CFrameWnd::OnHelp message handler.
void CMainFrame::OnHelp()
{
HtmlHelp(m_hWnd, "sample.chm>MyWindowName",
HH_DISPLAY_TOPIC,0);
}