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/////////////////////////////////////////////////////////////////////////////
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// Name: src/msw/helpchm.cpp
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// Purpose: Help system: MS HTML Help implementation
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// Author: Julian Smart
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// Modified by: Vadim Zeitlin at 2008-03-01: refactoring, simplification
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// RCS-ID: $Id: helpchm.cpp 71640 2012-06-03 19:16:59Z VZ $
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#if wxUSE_HELP && wxUSE_MS_HTML_HELP
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#include "wx/filename.h"
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#include "wx/msw/helpchm.h"
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#include "wx/dynload.h"
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#include "wx/msw/private.h"
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#include "wx/msw/htmlhelp.h"
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// ----------------------------------------------------------------------------
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// utility functions to manage the loading/unloading
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// ----------------------------------------------------------------------------
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typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCSTR, UINT, DWORD );
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#define HTMLHELP_NAME wxT("HtmlHelpA")
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typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCWSTR, UINT, DWORD );
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#define HTMLHELP_NAME wxT("HtmlHelpW")
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HTMLHELP GetHtmlHelpFunction()
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static HTMLHELP s_htmlHelp = NULL;
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static wxDynamicLibrary s_dllHtmlHelp(wxT("HHCTRL.OCX"), wxDL_VERBATIM);
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if ( !s_dllHtmlHelp.IsLoaded() )
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wxLogError(_("MS HTML Help functions are unavailable because the MS HTML Help library is not installed on this machine. Please install it."));
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s_htmlHelp = (HTMLHELP)s_dllHtmlHelp.GetSymbol(HTMLHELP_NAME);
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wxLogError(_("Failed to initialize MS HTML Help."));
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// find the window to use in HtmlHelp() call: use the given one by default but
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// fall back to the top level app window and then the desktop if it's NULL
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static HWND GetSuitableHWND(wxWindow *win)
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if ( !win && wxTheApp )
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win = wxTheApp->GetTopWindow();
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return win ? GetHwndOf(win) : ::GetDesktopWindow();
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IMPLEMENT_DYNAMIC_CLASS(wxCHMHelpController, wxHelpControllerBase)
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bool wxCHMHelpController::Initialize(const wxString& filename)
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if ( !GetHtmlHelpFunction() )
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m_helpFile = filename;
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bool wxCHMHelpController::LoadFile(const wxString& file)
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wxCHMHelpController::CallHtmlHelp(wxWindow *win,
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HTMLHELP htmlHelp = GetHtmlHelpFunction();
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return htmlHelp && htmlHelp(GetSuitableHWND(win), str, cmd, param);
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bool wxCHMHelpController::DisplayContents()
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if (m_helpFile.IsEmpty())
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return CallHtmlHelp(HH_DISPLAY_TOPIC);
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// Use topic or HTML filename
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bool wxCHMHelpController::DisplaySection(const wxString& section)
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if (m_helpFile.IsEmpty())
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// Is this an HTML file or a keyword?
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if ( section.Find(wxT(".htm")) != wxNOT_FOUND )
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// interpret as a file name
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return CallHtmlHelp(HH_DISPLAY_TOPIC, wxMSW_CONV_LPCTSTR(section));
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return KeywordSearch(section);
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// Use context number
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bool wxCHMHelpController::DisplaySection(int section)
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if (m_helpFile.IsEmpty())
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return CallHtmlHelp(HH_HELP_CONTEXT, section);
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wxCHMHelpController::DoDisplayTextPopup(const wxChar *text,
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popup.cbStruct = sizeof(popup);
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popup.hinst = (HINSTANCE) wxGetInstance();
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popup.idString = contextId;
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popup.pszText = text;
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popup.clrForeground = ::GetSysColor(COLOR_INFOTEXT);
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popup.clrBackground = ::GetSysColor(COLOR_INFOBK);
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popup.rcMargins.top =
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popup.rcMargins.left =
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popup.rcMargins.right =
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popup.rcMargins.bottom = -1;
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popup.pszFont = NULL;
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return CallHtmlHelp(window, NULL, HH_DISPLAY_TEXT_POPUP, &popup);
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bool wxCHMHelpController::DisplayContextPopup(int contextId)
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return DoDisplayTextPopup(NULL, wxGetMousePosition(), contextId,
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wxCHMHelpController::DisplayTextPopup(const wxString& text, const wxPoint& pos)
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return ShowContextHelpPopup(text, pos, GetParentWindow());
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bool wxCHMHelpController::ShowContextHelpPopup(const wxString& text,
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return DoDisplayTextPopup(text.t_str(), pos, 0, window);
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bool wxCHMHelpController::DisplayBlock(long block)
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return DisplaySection(block);
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bool wxCHMHelpController::KeywordSearch(const wxString& k,
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wxHelpSearchMode WXUNUSED(mode))
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if (m_helpFile.IsEmpty())
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link.cbStruct = sizeof(HH_AKLINK);
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link.fReserved = FALSE;
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link.pszKeywords = k.t_str();
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link.pszMsgText = NULL;
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link.pszMsgTitle = NULL;
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link.pszWindow = NULL;
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link.fIndexOnFail = TRUE;
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return CallHtmlHelp(HH_KEYWORD_LOOKUP, &link);
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bool wxCHMHelpController::Quit()
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return CallHtmlHelp(NULL, NULL, HH_CLOSE_ALL);
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wxString wxCHMHelpController::GetValidFilename() const
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wxString path, name, ext;
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wxFileName::SplitPath(m_helpFile, &path, &name, &ext);
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fullName = name + wxT(".chm");
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else if (path.Last() == wxT('\\'))
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fullName = path + name + wxT(".chm");
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fullName = path + wxT("\\") + name + wxT(".chm");