I guess I just forgot to upload it from my package-cache. Please try again
with the ImageFormat-dtl.26 that I just uploaded, it should work now. Sorry
for the confusion.

Dave


On Tue, Jul 25, 2017 at 01:54:43PM -0400, Louis LaBrunda wrote:
> Hi Dave,
> 
> Thanks Dave.  I will check tomorrow.  For now I will assume it will get fixed and work around
> it.
> 
> Lou
> 
> On Tue, 25 Jul 2017 13:47:12 -0400 (EDT), "David T. Lewis" <lewis at mail.msen.com> wrote:
> 
> >Hi Lou,
> >
> >Ugh, I think that was due to a bug that I fixed not too long ago (some
> >missing methods for the latest Spur formats IIRC). I thought I had
> >uploaded the fix but I do not see it in the repository. My apologies, I
> >will address it as quickly as I can, but it might not be until tomorrow.
> >
> >Sorry,
> >Dave
> >
> >
> >> Hi Dave,
> >>
> >> Thanks you very much for the prompt reply.  I loaded the ImageFormat
> >> package as you suggested
> >> into a fairly new 32 bit image.  But when I try ImageFormat fromFile: to
> >> that image of the
> >> image with my program, I get an "unrecognized image format" error.  I will
> >> keep trying more
> >> after lunch but for now I don't get it?
> >>
> >> Lou
> >>
> >>
> >> On Tue, 25 Jul 2017 11:18:05 -0400 (EDT), "David T. Lewis"
> >> <lewis at mail.msen.com> wrote:
> >>
> >>>Hi Lou,
> >>>
> >>>A simple check is to look at the first bytes of the image file, which
> >>>define the image format number. If the image format is something
> >>>reasonable (presumably the same as whatever image you are replacing in
> >>>most cases), then you know that it is a Squeak image file, although this
> >>>will not tell you if the actual image is valid.
> >>>
> >>>To do this from a running Squeak image, try loading the ImageFormat
> >>>package from the VMMaker repository on squeaksource.com. Look at the
> >>> class
> >>>comments, and you will find methods for reading the image format number
> >>>from a file stream.
> >>>
> >>>There is also a C program called ckformat.c at
> >>>http://squeakvm.org/cgi-bin/viewvc.cgi/squeak/trunk/src/. The C code is
> >>>automatically generated from the ImageFormat package, so they the do the
> >>>same thing. If you want to do the test from a shell script, as opposed to
> >>>doing it from the running image, then you can use this C program.
> >>>
> >>>Of course in theory you can load an entire image file into a VM simulator
> >>>with the VMMaker package, but that would not be a practical test for what
> >>>you are trying to accomplish.
> >>>
> >>>If you need a better test of "valid" then you might consider using
> >>>OSProcess/CommandShell to actually run the image file and see if it
> >>> works.
> >>>Probably you would do something like run it with a PipeableOSProcess
> >>>connected to your main Squeak image, and just kill the image under test
> >>>once you have confirmed that it runs.
> >>>
> >>>Dave
> >>>
> >>>> Hi All,
> >>>>
> >>>> Can a running Squeak program look at a Squeak image file and know if it
> >>>> is
> >>>> a good image?  I'm
> >>>> working on a program that the user won't have easy access to.  I would
> >>>> like to allow its
> >>>> replacement with a new version.  I think I know how to do that but
> >>>> would
> >>>> like to see if I can
> >>>> program in some protection from the user replacing the image with a bad
> >>>> or
> >>>> completely wrong
> >>>> file.  Any ideas?
> >>>>
> >>>>
> >>>> Lou
> >>>> --
> >>>> Louis LaBrunda
> >>>> Keystone Software Corp.
> >>>> SkypeMe callto://PhotonDemon
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >> --
> >> Louis LaBrunda
> >> Keystone Software Corp.
> >> SkypeMe callto://PhotonDemon
> >>
> >>
> >>
> >
> >
> >
> -- 
> Louis LaBrunda
> Keystone Software Corp.
> SkypeMe callto://PhotonDemon
> 
>