convert pdf to png

[Carl K]

Jaap Spies wrote:
> Carl K wrote:
>> Grant Edwards wrote:
>>> On 2007-12-24, Carl K <carl at personnelware.com> wrote:
>>>
>>>>> If it is a multi page pdf Imagemagick will do:
>>>>>
>>>>> convert file.pdf page-%03d.png
>>>> I need python code to do this.  It is going to be run on a
>>>> someone else's shared host web server, security and
>>>> performance is an issue.  So I would rather not run stuff via
>>>> popen.
>>>
>>> Use subprocess.
>>>
>>> Trying to eliminate popen because of the overhead when running
>>> ghostscript to render PDF (I assume convert uses gs?) is about
>>> like trimming an elephants toenails to save weight.
>>>
>>
>> maybe, but I wouldn't be so sure.
>>
>> currently the pdf is created in a python StringIO buffer and returned 
>> to the browser;  so it never becomes a file.  using convert means I 
>> have to first save it as a file, convert from file to file, read the 
>> file, delete the 2 files. so 6 file operations where before there were 
>> none.  That may be more of a load than the ghostscript part.
>>
>> Carl K
> 
> Are you clever and am I stupid? I did not read this in your original post!
> 

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

Carl K