[mythtv] Re: compiling mythtv frontend for cygwin

[Mario L]

I went a little further into this and it isn't a null string being
returned, the object does exist.  I am really starting to think that
we might have hit some sort of QT bug here:

                    QStringList verboseOpts;
                    verboseOpts =
QStringList::split(',',a.argv()[argpos+1],true);
                    ++argpos;
                    if (&verboseOpts == NULL)
                        VERBOSE(VB_ALL, "null stringlist");
                    else
                    {
                             VERBOSE(VB_ALL,&verboseOpts);
                             VERBOSE(VB_ALL,verboseOpts.size());
                             VERBOSE(VB_ALL,"empty? " + verboseOpts.empty());
                             if (verboseOpts.front() == NULL)
                                VERBOSE(VB_ALL, "null iterator");
                             else
                                VERBOSE(VB_ALL, "crazy iterator");
                     }    
                    QStringList::Iterator it = verboseOpts.begin();
                    VERBOSE(VB_ALL,"it has begun");                    
                    for (QStringList::Iterator it = verboseOpts.begin(); 
                         it != verboseOpts.end(); ++it )

Adding those extra output lines gets me this:
$ /c/myth/mythfrontend.exe -v all
2004-10-14 15:57:08 0x23fdb8
2004-10-14 15:57:08 213979536
2004-10-14 15:57:08 empty? 

Which does prove that it isn't a NULL QStringList, and also the fact
that the iterator list is fairly large, a little too large if i would
say.  Debugging iterator stuff in QT is not going to be a very
enjoyable task I'll recon.  I'm going to rebuild my QT later tonight
with debug support, and see if later on after work I can try'n use gdb
to learn a bit about the problem.
 
On Thu, 14 Oct 2004 15:43:17 -0500, Mario L <superm1 at gmail.com> wrote:
> Well but that theory seems to be broken because the same thing happens
> in globalsettings.cpp, unless that is one problem and this is another
> completely unrelated problem:
> 
> class StyleSetting: public ComboBoxSetting, public GlobalSetting {
> public:
>     StyleSetting():
>         GlobalSetting("Style") {
>         setLabel(QObject::tr("Qt Style"));
>         fillSelections();
>         setHelpText(QObject::tr("At startup, MythTV will change the Qt "
>                     "widget style to this setting.  If \"Desktop Style\" "
>                     "is selected, MythTV will use the existing desktop "
>                     "setting."));
>     };
> 
>     void fillSelections(void) {
>         clearSelections();
>         addSelection(QObject::tr("Desktop Style"), "");
>         QStyleFactory factory;
>         QStringList list = factory.keys();
>         QStringList::iterator iter = list.begin();
>         VERBOSE(VB_ALL,"iteration started");
>         for (; iter != list.end(); iter++ )
>             addSelection(*iter);
>     };
> 
>     void load(QSqlDatabase *db) {
>         fillSelections();
>         GlobalSetting::load(db);
>     };
> };
> 
> If you look further into that keys function, it must yield something
> out, each of the entries are manually added in:
> 
> QStringList QStyleFactory::keys()
> {
>     QStringList list;
> #ifndef QT_NO_COMPONENT
>     if ( !instance )
>         instance = new QStyleFactoryPrivate;
> 
>     list = QStyleFactoryPrivate::manager->featureList();
> #endif //QT_NO_COMPONENT
> 
> #ifndef QT_NO_STYLE_WINDOWS
>     if ( !list.contains( "Windows" ) )
>         list << "Windows";
> #endif
> #ifndef QT_NO_STYLE_WINDOWSXP
>     if ( !list.contains( "WindowsXP" ) && QWindowsXPStyle::resolveSymbols() )
>         list << "WindowsXP";
> #endif
> #ifndef QT_NO_STYLE_MOTIF
>     if ( !list.contains( "Motif" ) )
>         list << "Motif";
> #endif
> #ifndef QT_NO_STYLE_CDE
>     if ( !list.contains( "CDE" ) )
>         list << "CDE";
> #endif
> #ifndef QT_NO_STYLE_MOTIFPLUS
>     if ( !list.contains( "MotifPlus" ) )
>         list << "MotifPlus";
> #endif
> #ifndef QT_NO_STYLE_PLATINUM
>     if ( !list.contains( "Platinum" ) )
>         list << "Platinum";
> #endif
> #ifndef QT_NO_STYLE_SGI
>     if ( !list.contains( "SGI" ) )
>         list << "SGI";
> #endif
> #ifndef QT_NO_STYLE_COMPACT
>     if ( !list.contains( "Compact" ) )
>         list << "Compact";
> #endif
> #ifndef QT_NO_STYLE_AQUA
>     if ( !list.contains( "Aqua" ) )
>         list << "Aqua";
> #endif
> #if !defined( QT_NO_STYLE_MAC ) && defined( Q_WS_MAC )
>     QString mstyle = "Macintosh";
>     Collection c = NewCollection();
>     if (c) {
>         GetTheme(c);
>         Str255 str;
>         long int s = 256;
>         if(!GetCollectionItem(c, kThemeNameTag, 0, &s, &str))
>             mstyle += " (" + p2qstring(str) + ")";
>     }
>     if (!list.contains(mstyle))
>         list << mstyle;
>     DisposeCollection(c);
> #endif
> 
>     return list;
> }
>