# Re: Segfault in xscanimage

From: Oliver Rauch (oliver.rauch@Wolfsburg.DE)
Date: Sat Jan 29 2000 - 08:40:07 PST

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  Karl Heinz Kremer wrote:

  > I need some help debugging a problem (or ruling out that my
  > backend is causing this problme):
  >
  > When I run xscanimage with the latest CVS version of the Epson
  > backend I get a segmentation fault when
  > - Advanced options are _NOT_ selected
  > - and I click on scan or preview
  >
  > When the advanced options are displayed everything works fine.
  >
  > The following output is produced when running xscanimage in gdb:
  >
  > (gdb) run
  > Starting program: /usr/bin/xscanimage
  >
  > Gtk-WARNING **: invalid cast from (NULL) pointer to `GtkGammaCurve'
  >
  > Program received signal SIGSEGV, Segmentation fault.
  > 0x8054e37 in gsg_sync (dialog=0x8097ae0) at gtkglue.c:1334
  > 1334 curve = GTK_GAMMA_CURVE (dialog->element[i].widget)->curve;
  > (gdb) quit
  >
  > The fault happens in line 1334 of gtkglue.c.
  >
  > Is this my fault, and if so, where should I look?
  >

  Hi Karl Heinz

  try if it works when you comment out:
  s->opt[ OPT_GAMMA_VECTOR].cap |= SANE_CAP_ADVANCED;
  and the equivalent lines for red/green/blue

  Bye
  Oliver

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