Carl Karsten wrote:
I am using python's reportlab to create a pdf (of a conference name tag)
and I want to be able to have an image preview on the registration form
web page.
convert foo.pdf foo.png does what I need. What I am looking for is a
good API to that, or anything similar.
Ideally, it won't require a file system file (easier on the web server.)
Here is what the code looks like that generates the pdf:
buffer = StringIO()
rw = dReportWriter(OutputFile=buffer, ReportFormFile=xmlfile,
Cursor=ds)
rw.write()
pdf = buffer.getvalue()
return pdf
lucky for me Achim Domma just made a very early alpha version of python bindings
for ImageMagick. yay! http://www.procoders.net/?p=39
this works:
from PythonMagickWand import *
def test1():
MagickWandGenesis()
wand = NewMagickWand()
MagickReadImage(wand,"badge.pdf")
MagickWriteImage(wand,"badge.png")
But that is reading/writing a file. I took a shot at coding it to accept the
pdf as a blob, and here is what I get:
def test2():
MagickWandGenesis()
wand = NewMagickWand()
# read in the pdf
pdf=open("badge.pdf").read()
# convert pdf to png
MagickReadImageBlob(wand, pdf, len(pdf) )
At this point it crashes:
Error: /ioerror in --run--
Operand stack:
--nostringval-- --nostringval-- ( !\n%)
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval--
--nostringval-- 2 %stopped_push --nostringval-- --nostringval--
--nostringval-- false 1 %stopped_push 1889 1 3 %oparray_pop
--nostringval--
Dictionary stack:
--dict:1156/1684(ro)(G)-- --dict:0/20(G)-- --dict:92/200(L)--
Current allocation mode is local
Last OS error: 21
GPL Ghostscript SVN PRE-RELEASE 8.61: Unrecoverable error, exit code 1
12397 Segmentation fault (core dumped) python ckpmw.py
The fact that ghostscript is involved is encouraging - it means it knows it is
pdf data.
Once I get that working, I will need this to work:
def test3():
MagickWandGenesis()
wand = NewMagickWand()
MagickReadImage(wand,"badge.pdf")
MagickSetFormat(wand, 'PNG' )
png=MagickGetImageBlob(wand, 1000000 )
# png = MagickWriteImageBlob(wand, ???)
#
http://www.imagemagick.org/www/api/magick-deprecate.html#MagickWriteImageBlob
# write the png
open("badge.png", 'wb').write(png)
This is the closest I have come to working with python ctypes, so forgive me if
I am totally missing something.
Carl K
_______________________________________________
Magick-users mailing list
[email protected]
http://studio.imagemagick.org/mailman/listinfo/magick-users
