[Zope] Reportlab issue

[Jonathan]

----- Original Message ----- 
From: "David H" <bluepaul at earthlink.net>
To: "zope user list" <zope at zope.org>
Sent: Sunday, August 27, 2006 9:48 PM
Subject: Re: [Zope] Reportlab issue


> Jonathan wrote:
>
>>
>> ----- Original Message ----- From: "David H" <bluepaul at earthlink.net>
>> To: "Jonathan" <dev101 at magma.ca>
>> Cc: "zope user list" <zope at zope.org>
>> Sent: Sunday, August 27, 2006 9:25 PM
>> Subject: Re: [Zope] Reportlab issue
>>
>>
>>> Jonathan wrote:
>>>
>>>>
>>>> ----- Original Message ----- From: "David H" <bluepaul at earthlink.net>
>>>> To: "zope user list" <zope at zope.org>
>>>> Sent: Sunday, August 27, 2006 8:54 PM
>>>> Subject: [Zope] Reportlab issue
>>>>
>>>>
>>>>> Hi Zope List,
>>>>>
>>>>> I have an Zope application that uses ReportLab to generate acrobat 
>>>>> viewable reports. (I already posted this to reportlab list - so far no 
>>>>> solutions).
>>>>>
>>>>> Heres the problem:
>>>>>
>>>>> I display an acrobat report (using Firefox or IE 6) and say scroll 
>>>>> down to page 10.  I then use the <browser> back button to re-enter my 
>>>>> Zope application.
>>>>>
>>>>> Now, even if I click various unrelated pages in the application 
>>>>> (clearing the request,etc) and then return to the Report (which is 
>>>>> always freshly generated) it will try to re-display at page 10 - 
>>>>> instead of top of page.
>>>>> This occurs even if the data being reported has changed, and this 
>>>>> occurs even if a different report is generated!
>>>>>
>>>>> Note: that I use
>>>>>
>>>>> import tempfile and
>>>>> tmpFile2 = tempfile.mktemp()
>>>>>
>>>>> to keep pdfPath's unique ...
>>>>>
>>>>> I've tried combinations of "Content-Disposition" params like changing 
>>>>> filename=, etc.  Nothing is changing this behavior.
>>>>>
>>>>> I've tried (a reportlab mailing list suggestion) varying to <forms 
>>>>> action= like
>>>>>
>>>>>   <form name="printform" method="post" 
>>>>> action="extensions/pyBudgetReports"
>>>>>         tal:attributes="action python: 
>>>>> 'extensions/pyBudgetReports/?random=' + context.python.pyTime()">
>>>>>
>>>>> No help either.
>>>>
>>>>
>>>>
>>>>
>>>> I have never used ReportLab, but is there a possibility that when you 
>>>> go back to the adobe document it is being served from a cache?  You 
>>>> could try using html meta tags or response.setHeader (better) to make 
>>>> sure the document is not being served from the cache.
>>>>
>>>> Just a shot in the dark!
>>>>
>>>>
>>>> Jonathan
>>>>
>>> Hi Jonathan,
>>>
>>> Yes, I did try that, e.g. (report lab + external file stuff)
>>>   # -----------------------------------------------------------
>>>   def writeReport(self, RESPONSE):
>>>   # -----------------------------------------------------------
>>>      """
>>>        generates report output
>>>      """
>>>         self.save()
>>>         theFile=open( self.pdfpath,'rb')
>>>         result = theFile.read()
>>>         theFile.close()
>>>         os.remove(self.pdfpath)
>>>         # the next 3 lines were snarked from google "zope no cache"  I 
>>> think its a casey duncan recipe ...
>>>         RESPONSE.setHeader('Pragma', 'no-cache')
>>>         RESPONSE.setHeader('Cache-Control','no-cache')
>>>         RESPONSE.setHeader('Expires', 'Sat, 1 Jan 2000 00:00:00 GMT')
>>>         # the normal fair
>>>         RESPONSE.setHeader('Content-Type','application/pdf')
>>>
>>> RESPONSE.setHeader('Content-Disposition','inline;filename="reportNz.pdf"')
>>>         RESPONSE.setHeader('Content-Length',len(result))
>>>         RESPONSE.write(result) # result is
>>>
>>> And it didn't help.
>>
>>
>> Another shot in the dark... could it be an adobe acrobat issue? By which 
>> i mean that adobe sees that you are looking at the same document 
>> (reportNz.pdf) and then tries to reopen the document at the last point 
>> you were looking.  Try randomizing the file name (add 2 or 3 random 
>> digits to the filename and see what happens).
>>
>> Good luck!
>>
>> Jonathan
>
> Jonathan,
> We think alike.  If you scan my original msg you'll see that I tested 
> varying the Content-Dispostion ...  report= name as well.
>

Sorry, i missed that in your original post.  I'm all out of 
shots-in-the-dark!  Have you tried seeking help on the adobe acrobat 
developer lists?


Jonathan