Re: Trying to read PICT data using Quartz functions
Re: Trying to read PICT data using Quartz functions
- Subject: Re: Trying to read PICT data using Quartz functions
- From: Scott Thompson <email@hidden>
- Date: Fri, 21 Apr 2006 15:20:02 -0500
On Apr 21, 2006, at 11:12 AM, Kenny Leung wrote:
I have been uniformly unsuccessful in trying to read PICT data
embedded in a data file. I have the specs for the data file, so I'm
pretty sure I'm doing things right.
I have tried extracting the data and sending it to the functions
QDPictCreateWithProvider and CGImageCreateWithJPEGDataProvider,
which both return NULL. The PICT data seems to have all 0's in the
beginning and start with the PICT header code 0x001102FF at 0x60
into the data. I have tried starting at 0 and at the PICT header
and neither have worked.
Does anyone have more experience with PICTs?
Where is your PICT data coming from? I've had no trouble using
QDPictCreateWithProvider to convert PICT data into PDF files.
I don't know about your particular case, but 96 bytes of 0's doesn't
sound right. Usually PICT data either has a 512 byte header or no
header. However I don't think the version bytes (the 0x001102FF) are
the very beginning of the header. I believe you have to back up a
few bytes from there.
Scott
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