Hello all,
In my FLTK application, I'm getting a segfault.
Running the program, this is part of
the output I get:
[...]
generated catalog
deleting old buffer
appending new cat
Contents=
Catalog timestamp : Wed 2009-06-17 19:26:58 BST
Volume name :
Number of projects : 0
Segmentation fault
This is the relevant code snippet generating the segfault:
-------------
/* to prevent re-refresh by selecting current project
which will select a song which will refresh the current
ui again...(in case of corrupt 'unexpected end of song'
songs): */
if (refreshingui>1) return;
refreshingui++;
// init dropdown lists.
#if (HD24DEBUG==1)
cout << "going to clear dropdown lists" << endl;
#endif
if (projectname!=NULL)
{
for (unsigned int q=0;q<=99;q++)
{
projectname->remove(0);
}
}
if (songname!=NULL)
{
for (unsigned int q=0;q<=99;q++)
{
songname->remove(0);
}
}
#if (HD24DEBUG==1)
cout << "going to populate drive list" << endl;
#endif
populate_drivelist(0);
// following uses fsys (the default drive)
#if (HD24DEBUG==1)
cout << "get projcount then?" << endl;
#endif
string* nump=Convert::int2str(currenthd24->projectcount());
#if (HD24DEBUG==1)
cout << "got projcount=" << *nump << endl;
#endif
number_of_projects->value(nump->c_str());
delete (nump);
#if (HD24DEBUG==1)
cout << "last project id=" << currenthd24->lastprojectid() << endl;
#endif
populate_projectlist(currenthd24->lastprojectid());
#if (HD24DEBUG==1)
cout << "project list populated." << endl;
#endif
string* cat=new string("");
#if (HD24DEBUG==1)
cout << "updating gui TOC" << endl;
#endif
if (hd24utils::gencatalog(this->currenthd24,cat)==0) {
#if (HD24DEBUG==1)
cout << "generated catalog" << endl;
#endif
#if (HD24DEBUG==1)
cout << "deleting old buffer" << endl;
#endif
this->catalogbuffer->remove(0,this->catalogbuffer->length()-1);
#if (HD24DEBUG==1)
cout << "appending new cat" << endl;
cout << "Contents=" << endl;
cout << cat->c_str() << endl;
#endif
this->catalogbuffer->append(cat->c_str());
}
#if (HD24DEBUG==1)
cout << "deleting catalog string" << endl;
#endif
delete(cat);
#if (HD24DEBUG==1)
cout << "get version" << endl;
#endif
string* version1=currenthd24->version();
#if (HD24DEBUG==1)
cout << "got version" << endl;
#endif
fsversion->value(version1->c_str());
delete(version1);
calcspace();
refreshingui--;
--
So it appears that the segfault occurs in the line
this->catalogbuffer->append(cat->c_str());
With all of these defined as they should,
I'm at a loss.
Yesterday when I tried tracing with
gdb, the backtrace indicated a problem in XLoadQueryFont
(called through fl_font -> fl_xxfont if I recall
correctly)
I tried updating my 1.1.7 FLTK to 1.1.9 and still get
the same segfault, however when I try to run the program
through gdb now, I'm getting a segfault at a much earlier
stage.
My questions are:
1. What can I do about the segfault in XLoadQueryFont?
Are there any known workarounds?
2. I'm currently compiling with -O0 (no optimizing at
all), but the code runs differently when running
in gdb instead of by itself, making it hard to see
what the code is actually doing. Is there anything I
can do about that?
Thanks in advance,
Marc
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