don't crash when trying to dump struct members which are NULL pointers

[wxWidgets.git] / src / msw / helpchm.cpp

diff --git a/src/msw/helpchm.cpp b/src/msw/helpchm.cpp
index 2fa6dd4495676aa9a2bb65e8ac0a564a47dc1432..9e8c8846fa3349eeb27e24667291e189e028e233 100644 (file)
--- a/src/msw/helpchm.cpp
+++ b/src/msw/helpchm.cpp
@@ -6,40 +6,84 @@
 // Created:     16/04/2000
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
 // Created:     16/04/2000
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart

-// Licence:    wxWindows licence
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "helpchm.h"
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+    #pragma implementation "helpchm.h"

 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

-#ifndef WX_PRECOMP
-#include "wx/defs.h"
-#endif
+#if wxUSE_HELP && wxUSE_MS_HTML_HELP && defined(__WIN95__)

 
 #include "wx/filefn.h"
 
 #include "wx/filefn.h"

-
-#if wxUSE_HELP && wxUSE_MS_HTML_HELP && defined(__WIN95__)

 #include "wx/msw/helpchm.h"
 
 #include "wx/msw/helpchm.h"
 

-// This is found in the HTML Help Workshop installation,
-// along with htmlhelp.lib.
-#include <htmlhelp.h>
+#include "wx/dynload.h"

 
 

-#include <time.h>
+#ifndef WX_PRECOMP
+    #include "wx/intl.h"
+    #include "wx/app.h"
+#endif

 
 

-#ifdef __WXMSW__

 #include "wx/msw/private.h"
 #include "wx/msw/private.h"

+#include "wx/msw/missing.h"
+
+// ----------------------------------------------------------------------------
+// utility functions to manage the loading/unloading
+// of hhctrl.ocx
+// ----------------------------------------------------------------------------
+
+#ifndef UNICODE
+    typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCSTR, UINT, DWORD );
+    #define HTMLHELP_NAME wxT("HtmlHelpA")
+#else // ANSI
+    typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCWSTR, UINT, DWORD );
+    #define HTMLHELP_NAME wxT("HtmlHelpW")

 #endif
 
 #endif
 

-#include <string.h>
+// dll symbol handle
+static HTMLHELP gs_htmlHelp = 0;
+
+static bool LoadHtmlHelpLibrary()
+{
+    wxPluginLibrary *lib = wxPluginManager::LoadLibrary( _T("HHCTRL.OCX"), wxDL_DEFAULT | wxDL_VERBATIM );
+
+    if( !lib )
+    {
+        wxLogError(_("MS HTML Help functions are unavailable because the MS HTML Help library is not installed on this machine. Please install it."));
+        return false;
+    }
+    else
+    {
+        gs_htmlHelp = (HTMLHELP)lib->GetSymbol( HTMLHELP_NAME );
+
+        if( !gs_htmlHelp )
+        {
+            wxLogError(_("Failed to initialize MS HTML Help."));
+
+            lib->UnrefLib();
+            return false ;
+        }
+    }
+
+    return true;
+}
+
+static void UnloadHtmlHelpLibrary()
+{
+    if ( gs_htmlHelp )
+    {
+        if (wxPluginManager::UnloadLibrary( _T("HHCTRL.OCX") ))
+            gs_htmlHelp = 0;
+    }
+}

 
 static HWND GetSuitableHWND()
 {
 
 static HWND GetSuitableHWND()
 {


@@ -53,53 +97,99 @@ IMPLEMENT_DYNAMIC_CLASS(wxCHMHelpController, wxHelpControllerBase)
 
 bool wxCHMHelpController::Initialize(const wxString& filename)
 {
 
 bool wxCHMHelpController::Initialize(const wxString& filename)
 {

+    // warn on failure
+    if( !LoadHtmlHelpLibrary() )
+        return false;
+

     m_helpFile = filename;
     m_helpFile = filename;

-    return TRUE;
+    return true;

 }
 
 bool wxCHMHelpController::LoadFile(const wxString& file)
 {
     if (!file.IsEmpty())
         m_helpFile = file;
 }
 
 bool wxCHMHelpController::LoadFile(const wxString& file)
 {
     if (!file.IsEmpty())
         m_helpFile = file;

-    return TRUE;
+    return true;

 }
 
 bool wxCHMHelpController::DisplayContents()
 {
 }
 
 bool wxCHMHelpController::DisplayContents()
 {

-    if (m_helpFile.IsEmpty()) return FALSE;
+    if (m_helpFile.IsEmpty()) return false;

 
     wxString str = GetValidFilename(m_helpFile);
 
 
     wxString str = GetValidFilename(m_helpFile);
 

-    HtmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_HELP_FINDER, 0L);
-    return TRUE;
+    gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, 0L);
+    return true;

 }
 
 // Use topic or HTML filename
 bool wxCHMHelpController::DisplaySection(const wxString& section)
 {
 }
 
 // Use topic or HTML filename
 bool wxCHMHelpController::DisplaySection(const wxString& section)
 {

-    if (m_helpFile.IsEmpty()) return FALSE;
+    if (m_helpFile.IsEmpty()) return false;

 
     wxString str = GetValidFilename(m_helpFile);
 
     // Is this an HTML file or a keyword?
 
     wxString str = GetValidFilename(m_helpFile);
 
     // Is this an HTML file or a keyword?

-    bool isFilename = (section.Find(wxT(".htm")) != -1);
+    bool isFilename = (section.Find(wxT(".htm")) != wxNOT_FOUND);

 
     if (isFilename)
 
     if (isFilename)

-        HtmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, (DWORD) (const wxChar*) section);
+        gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, (DWORD) (const wxChar*) section);

     else
         KeywordSearch(section);
     else
         KeywordSearch(section);

-    return TRUE;
+    return true;

 }
 
 // Use context number
 bool wxCHMHelpController::DisplaySection(int section)
 {
 }
 
 // Use context number
 bool wxCHMHelpController::DisplaySection(int section)
 {

-    if (m_helpFile.IsEmpty()) return FALSE;
+    if (m_helpFile.IsEmpty()) return false;

 
     wxString str = GetValidFilename(m_helpFile);
 
 
     wxString str = GetValidFilename(m_helpFile);
 

-    HtmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_HELP_CONTEXT, (DWORD)section);
-    return TRUE;
+    gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_HELP_CONTEXT, (DWORD)section);
+    return true;
+}
+
+bool wxCHMHelpController::DisplayContextPopup(int contextId)
+{
+    if (m_helpFile.IsEmpty()) return false;
+
+    wxString str = GetValidFilename(m_helpFile);
+
+    // We also have to specify the popups file (default is cshelp.txt).
+    // str += wxT("::/cshelp.txt");
+
+    HH_POPUP popup;
+    popup.cbStruct = sizeof(popup);
+    popup.hinst = (HINSTANCE) wxGetInstance();
+    popup.idString = contextId ;
+
+    GetCursorPos(& popup.pt);
+    popup.clrForeground = (COLORREF)-1;
+    popup.clrBackground = (COLORREF)-1;
+    popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
+    popup.pszFont = NULL;
+    popup.pszText = NULL;
+
+    gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
+    return true;
+}
+
+bool wxCHMHelpController::DisplayTextPopup(const wxString& text, const wxPoint& pos)
+{
+    HH_POPUP popup;
+    popup.cbStruct = sizeof(popup);
+    popup.hinst = (HINSTANCE) wxGetInstance();
+    popup.idString = 0 ;
+    popup.pt.x = pos.x; popup.pt.y = pos.y;
+    popup.clrForeground = (COLORREF)-1;
+    popup.clrBackground = (COLORREF)-1;
+    popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
+    popup.pszFont = NULL;
+    popup.pszText = (const wxChar*) text;
+
+    gs_htmlHelp(GetSuitableHWND(), NULL, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
+    return true;

 }
 
 bool wxCHMHelpController::DisplayBlock(long block)
 }
 
 bool wxCHMHelpController::DisplayBlock(long block)


@@ -107,9 +197,10 @@ bool wxCHMHelpController::DisplayBlock(long block)
     return DisplaySection(block);
 }
 
     return DisplaySection(block);
 }
 

-bool wxCHMHelpController::KeywordSearch(const wxString& k)
+bool wxCHMHelpController::KeywordSearch(const wxString& k,
+                                        wxHelpSearchMode WXUNUSED(mode))

 {
 {

-    if (m_helpFile.IsEmpty()) return FALSE;
+    if (m_helpFile.IsEmpty()) return false;

 
     wxString str = GetValidFilename(m_helpFile);
 
 
     wxString str = GetValidFilename(m_helpFile);
 


@@ -123,14 +214,15 @@ bool wxCHMHelpController::KeywordSearch(const wxString& k)
     link.pszWindow =    NULL ;
     link.fIndexOnFail = TRUE ;
 
     link.pszWindow =    NULL ;
     link.fIndexOnFail = TRUE ;
 

-    HtmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_KEYWORD_LOOKUP, (DWORD)& link);
-    return TRUE;
+    gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_KEYWORD_LOOKUP, (DWORD)& link);
+    return true;

 }
 
 bool wxCHMHelpController::Quit()
 {
 }
 
 bool wxCHMHelpController::Quit()
 {

-    HtmlHelp(GetSuitableHWND(), 0, HH_CLOSE_ALL, 0L);
-    return TRUE;
+    gs_htmlHelp(GetSuitableHWND(), 0, HH_CLOSE_ALL, 0L);
+
+    return true;

 }
 
 // Append extension if necessary.
 }
 
 // Append extension if necessary.


@@ -149,4 +241,10 @@ wxString wxCHMHelpController::GetValidFilename(const wxString& file) const
     return fullName;
 }
 
     return fullName;
 }
 

+wxCHMHelpController::~wxCHMHelpController()
+{
+    UnloadHtmlHelpLibrary();
+}
+

 #endif // wxUSE_HELP
 #endif // wxUSE_HELP

+