Thanks Dave, I got it now. Don't beat yourself up, I appreciate the help even if it is slow in coming. After all, beggars can't be choosers. Hopefully one last question. Is there some method or methods, I can send the running image and the image file that allow me to conclude they are close in nature?
Lou
On Tue, 25 Jul 2017 15:06:49 -0400 (EDT), "David T. Lewis" lewis@mail.msen.com wrote:
Lou,
So sorry, I think I need a new brain today. The repository is on source.squeak.org, not on squeaksource.com as I said in my earlier mail. The stuff on squeaksource.com is ancient, and all recent VM related work was moved to source.squeak.org a long time ago.
My apologies again!
Dave
Hey Dave,
I'm sure I'm messing something up but I can't find ImageFormat-dtl.26, they only go up to ImageFormat-dtl.12. Am I looking in the wrong place?
Lou
On Tue, 25 Jul 2017 14:06:30 -0400, "David T. Lewis" lewis@mail.msen.com wrote:
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@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@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
-- Louis LaBrunda Keystone Software Corp. SkypeMe callto://PhotonDemon