what about using a digital signature ? the current PDF standards and
even ODF standards support a digital signature
that would ensure the file hasnt been tampered with since it was
signed. Though i guess you could create a garbage PDF and sign it if
you wanted.
Best Regards,
Michele (M
On Oct 5, 2009, at 9:02 PM, James Walker wrote:
FWIW, in the classic Mac OS, it was not uncommon to see a PDF with
NO extension, but with the file type set to 'PDF '.
Yes. Fortunately, if you have your application check the UTI instead
of the filename extension, you'll always detect that it
On Mon, Oct 5, 2009 at 6:30 PM, Graham Cox wrote:
> This is true, but how far are you prepared to go? Others have suggested
> checking a few bytes into the file's header which should be reasonable
> enough, but I could create a file having a valid PDF header and garbage
> thereafter... you cannot
Graham Cox wrote:
On 04/10/2009, at 11:07 PM, Squ Aire wrote:
But that isn't good enough really, because a file can have the pdf
extension without being a true PDF file.
This is true, but how far are you prepared to go? Others have suggested
checking a few bytes into the file's header whi
at sort of thing
Sent from my iPhone
On 2009/10/05, at 20:38, cocoa-dev-requ...@lists.apple.com wrote:
Re: Checking whether a file is a genuine PDF file
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Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or
On Oct 5, 2009, at 8:30 PM, Graham Cox wrote:
Most people would draw it with a simple check of the extension and
maybe for files that traditionally have been subject to extension
abuse (I don't think pdf is one of them)
Well, in this day and age I believe you should actually be checking
t
On 04/10/2009, at 11:07 PM, Squ Aire wrote:
But that isn't good enough really, because a file can have the pdf
extension without being a true PDF file.
This is true, but how far are you prepared to go? Others have
suggested checking a few bytes into the file's header which should be
re
On 10/5/09 7:49 AM, Squ Aire said:
>Thanks for the reply. However=2C of course a file can start with %PDF witho=
>ut being a valid PDF file (and not openable by Preview).
>
>I think I found an acceptable way of doing my thing. Just include the Quart=
>z framework and do
>
>PDFDocument *pdfDoc =3D
Subject: Re: Checking whether a file is a genuine PDF file
> From: sherm.pend...@gmail.com
> To: squ...@live.com
> CC: cocoa-dev@lists.apple.com
>
> On Sun=2C Oct 4=2C 2009 at 8:07 AM=2C Squ Aire wrote:
>>
>> I know that=2C in an open dialog for example=2C I can view
On 5/10/2009, at 4:12 AM, Sherm Pendley wrote:
On Sun, Oct 4, 2009 at 8:07 AM, Squ Aire wrote:
How can I check whether a file is indeed a true PDF file (that can
be, for example, opened in Preview)? Would I be able to filter true
PDFs file in an open dialog, or would I just have to stick to
On Sun, Oct 4, 2009 at 8:07 AM, Squ Aire wrote:
>
> I know that, in an open dialog for example, I can view all PDF files by just
> filtering using the "pdf" file extension. But that isn't good enough really,
> because a file can have the pdf extension without being a true PDF file.
>From /usr/s
I know that, in an open dialog for example, I can view all PDF files by just
filtering using the "pdf" file extension. But that isn't good enough really,
because a file can have the pdf extension without being a true PDF file.
How can I check whether a file is indeed a true PDF file (that can
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