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More Zope questions
by Nolan Darilek 07 Feb '00

07 Feb '00

Zope is awesome! (Just had to get that off of my chest. :) First of all, I'm not subscribed to this list. Please CC me with any responses; my inbox is just too full to justify subscribing to another list at the moment. :) A few weeks ago, I was having problems interfacing Zope with Roxen. Once I had accomplished that, I began working on redoing my homepage in Zope. Granted, using Zope for a personal webpage is overkill, but I learned lots about Zope in the process. I also like how I can immediately change the appearance of all of my pages, dynamically generate content and such without mucking about with CSS/CGI. Now I'm starting work on another Zope project. Last Christmas I began searching for a web-based system to catalog and play MP3's. I wanted something which would allow me to catalog MP3's, play them, search my collection, etc. I also wanted to stream MP3's to other computers, dynamically create low-bitrate streams for listening to my collection at home over a dial-in line, for example. I searched and, though I found some promising code, none of it did what I wanted. So, I started writing my own system. My first incarnation of code used Icecast for streaming, and since it was an Icecast-based jukebox I decided to call it Icebox. Icebox was a combination of PHP, Python and PostgreSQL though, and considering the fact that I didn't know much about PostgreSQL or PHP at the time, 2/3 of it was rather cludgy. It did the job, though. :) After discovering Zope, I decided to try rewriting Icebox as a one-piece solution. You'd only need to untar a tarball into your library directory and follow a few more Zope-based steps (see below) to get the thing working. This would be much easier than copying PHP pages into a specific page beneath your server root, setting up PostgreSQL and the needed tables, . . . So I rewrote Icebox's database layer to use ZODB, and began organizing the code into a Python package. I'm having a few issues, though. Rewriting Icebox's database layer to use ZODB was easy, but I'm running into a minor problem. I'm using MP3 objects which contain artist, title and album information about an MP3. The files are indexed in a ZODB using their paths as keys. When the Icebox command line utility runs and begins streaming an MP3, *.lock/.tmp files are left in the directory where the databases reside. This prevents the code from running again, since ZODB thinks that its databases are locked. I've tried calling close() methods on the database and root, but this doesn't work. I initially had a get_transaction().commit() call in the code, but this threw the following exception: Traceback (innermost last): File "/home/nolan/bin/icebox", line 37, in ? db.updatePlaylist() File "/home/nolan/src/Icebox/database.py", line 106, in updatePlaylist get_transaction().commit() File "/usr/lib/zope/lib/python/ZODB/Transaction.py", line 237, in commit j.commit(o,self) File "/usr/lib/zope/lib/python/ZODB/Connection.py", line 320, in commit state=object.__getstate__() File "/usr/lib/zope/lib/python/ZODB/Connection.py", line 391, in setstate p, serial = self._storage.load(oid, self._version) File "/usr/lib/zope/lib/python/ZODB/FileStorage.py", line 584, in load try: return self._load(oid, version, self._index, self._file) File "/usr/lib/zope/lib/python/ZODB/FileStorage.py", line 560, in _load pos=_index[oid] KeyError: Exit 1 Can anyone explain that? Is the get_transaction().commit()'s absence causing the lock files to remain? The database's contents appear to be changing, though. I have one final question. I'd like to distribute Icebox when it is complete, but I'm confused about how. Icebox isn't exactly a product; it is more of a complete site which is intended to be dropped in as is, or changed after installation. I think I recall seeing a directory where packages could be installed and their methods could be called as external methods in Zope. Would it be best to just build a tarball which is meant to unpack into this directory from the Zope root, and to export my site and distribute the results? Or, is there a better method for distributing complete sites? (Or, is my understanding of products completely flawed? I imagined them as collections of ZClasses, which Icebox is not.) Thanks a bunch.

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newbie wants technology advice
by danny shevitz 07 Feb '00

07 Feb '00

Since I've had such good luck posting to Zope, I'll try this one. I'm new to Zope and web technology but am pretty comfortable with Python and programming in general, but don't yet know Java. I want to put up a web page that has edit controls which appear dynamically as needed (a clumsy list editor of sorts). A second thing I want to do is drag and drop, but not text. I want to be able to drag icons around and do things depending on where they are dropped. It goes without saying that I want to do this in a Zope generated document. So the question is, what technology do I need to do this? Obviously static HTML isn't good enough. I doubt, but don't know if DTML can do it. I don't want each of the drag and drop icons to be submit buttons, because going back to the server after each drag and drop would be unacceptably slow. Do I need applets? Do I need Java? The sort of thing I need, but a little more complicated is like the paste button in the Zope workspace that dynamically appears after a cut or copy operation. I looked at the HTML and there appears to be a reference to Java. So again, what technology do I need to 1) make edit type controls dynamically appear 2) allow client side drag and drop of things other than text. ...And of course to do it within Zope. thanks, Danny __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

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Use of images in Zope
by Eron Lloyd 07 Feb '00

07 Feb '00

I know this is probably a very recurring question, but if given enough insight into it, I volunteer to make a How-To out of it to point out the nest time it comes up. Here it is: Can someone enlighten me to the DTML way of using images in Zope? I understand you can use a <dtml-var someimage> or <dtml-var "path.someimage">, but is there a way to have more control over how it would be rendered, i.e. with specifying attributes and values, as well? Thanks in advance, Eron

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Python.exe causes an exception in NT
by Graham Chiu 07 Feb '00

07 Feb '00

Zope/Zserver died today on my test machine when a remote user performed a sql query that returned most of the 40Mb of the database. This was basically searching for the letter 'A' about the description fields. I am using NT4 sp5 with 128Mb ram, and Zope 2.1.2 NT monitor showed that memory usage only climbed to 50%. On the 2nd 'next 50 records', Zserver/Zope dies with a python.exe exception. I can consistently reproduce this. I don't think this should be happening to me :-( ------- Regards, Graham Chiu gchiu<at>compkarori.co.nz http://www.compkarori.com/dynamo - The Homebuilt Dynamo http://www.compkarori.com/dbase - The dBase bulletin

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Still can't add photo programmatically
by Nicholas Piper 06 Feb '00

06 Feb '00

I'm very confused as to why I can add Photo objects via a URL such as http://localhost:8080/Intranet/Stuff/manage_addProduct/Photo/manage_addPhoto (with proper 'arguments' of course) yet calling <dtml-call "PARENTS[0].manage_addProduct.Photo.manage_addPhoto(PARENTS[0],'id', '', 'title', REQUEST)"> fails. Part traceback is ; File /usr/local/home/nicholas/downloads/Zope-2.1.1-src/lib/python/DocumentTemplate/DT_Util.py, line 335, in eval (Object: PARENTS[0].manage_addProduct.Photo.manage_addPhoto(PARENTS[0],'id', '', 'title', REQUEST)) (Info: PARENTS) File <string>, line 0, in ? File /usr/local/home/nicholas/downloads/Zope-2.1.1-src/lib/python/DocumentTemplate/DT_Util.py, line 127, in careful_getattr AttributeError: Photo Anyone have a clue ?! How is the URL found, if .Photo isn't found from inside DTML ? I've tried calling from a DTML Method *and* a Document. Same error !? -- <pcomm(a)inorbit.com> <http://www.innotts.co.uk/~nicholas/> 2048/BEC44395 1999/08/02 Nicholas C. Piper <nicholas(a)innotts.co.uk> If you want to change the automatic PGP actions of my mailer, see; http://www.innotts.co.uk/~nicholas/Personal/personal.php3?page=pgp

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Programmatically creating a DTML Document?
by Robb Shecter 06 Feb '00

06 Feb '00

Hi, I'm testing out using Zope as an HTTP-accessible database. (To be used by Java servlets!) Being lazy, I want to save my info as DTML Documents. I can't figure out how to programmatically make a new document in a sub folder, or set its contents. (I have seen pointers and examples for setting attributes of existing objects.) Can anyone help? Thanks, Robb

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comparing lists in DTML | Python?
by ed colmar 06 Feb '00

06 Feb '00

After reading Joachim Schmitz <js(a)ac-copy.net> post "extensive Looping in DTML considered harmful", I have a few questions about how this relates to my Product. I've also been stumped on how to do this in a few situations now. In my python product, I have three base classes: promoter, event, and person Inside of the promoter class there is a list variable called promoterdjs. Inside of the person class there is a string varialbe called djname. In my dtml, I have a page which displays the promoter, and checks to see if any of the djnames match with the items in promoterdj. If they match, I want to hyperlink them to the id of that dj. The code I have been hacking at looks like this: <dtml-if promotiondjs><strong><font size="+1"><dtml-var promotionname></font> DJs:</strong><BR> <dtml-with "PARENTS[0]"> <dtml-in promotiondjs><dtml-let thisdj=sequence-item> <dtml-in personValues> <dtml-if "meta_type == 'SRPersonPost'"> <dtml-if "_.str(thisdj) == _.str(djname)"> <A href="<dtml-var site_url>/<dtml-var id>"><dtml-var thisdj></a><br> <dtml-else><dtml-var thisdj><BR> </dtml-if> </dtml-if> </dtml-in> </dtml-let> </dtml-in> </dtml-with> <dtml-else> This promoter has no dj's associcated with it. </dtml-if promotiondjs> NOTE! this produces this output with two dj's that match: dj1 dj1 # with anchor dj2 # with snchor dj2 dj3 dj3 My question is: How would this be achieved in python, and what is the proper way to do it in DTML? Would the python look something like: def compareDJs(self,promoterdjs): ## untested ## """ return the input list as a tuple, with ids attached if none are found return the tuple with '0' """ persidlist = map(None,self.ids) for i in len(promoterdjs): personidlist = persidlist personidlist = filter(lambda x,p=self : p.data[x].meta_type == 'SRPersonPost', personidlist) personidlist = filter(lambda x,p=self : p.data[x].promotername == promoterdj[i], personidlist) personids.append(personidlist) return map(None, promoterdjs, personids) Thanks for any input! -ed-

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Cookies...
by Juri Jensen 06 Feb '00

06 Feb '00

Is it possible to set some kind of expiration time for users when they haven't done anything for a while...? -- mvh./Best regards Juri Jensen ----------------------------------- Pingvin Partner - Linux løsninger email: juri(a)jones.dk -----------------------------------

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Re: [Zope] Programmatically creating a DTML Document?
by Paul Stevens 06 Feb '00

06 Feb '00

Robb Shecter <shecter(a)darmstadt.gmd.de> writes: > Chris McDonough wrote: > > > Robb, > > > > You'd do something like this from within DTML: > > > > <dtml-call expr="manage_addDTMLDocument('mydocumentid', > > 'mydocumentitle', mycontent)"> > > Thank you! I actually did end up finding the add method in the ZQR. I > wasn't able to figure out on my own, though, what parameters the method > takes. How would I have been able to find this? Is there some some source > code file I can look in? The load_site.py script which is part of the distribution might be helpful. -- ________________________________________________________________ Paul Stevens mailto:paul@nfg.nl NET FACILITIES GROUP PGP: finger paul(a)nfg.nl The Netherlands________________________________http://www.nfg.nl

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problem with selection list in ZClass's addForm
by Darran Edmundson 06 Feb '00

06 Feb '00

Property Degree in my ZClass is of type "selection", getting its choices from the root folder property DegreeTypes. DegreeTypes is of type "lines" and has choices ['B.Sc.','M.Sc.','Ph.D.']. My problem is that the user's choice is not getting set properly by the class's constructor. The following is the relevent snippet from my addForm: <SELECT NAME="Degree"><dtml-in DegreeTypes> <OPTION VALUE="<dtml-var sequence-index>"><dtml-var sequence-item></OPTION> </dtml-in></SELECT> I've looked at the REQUEST variable being passed from the form and it is an integer corresponding correctly to the index of the selected Degree. I have tried casting this to string and to int but to no avail - it always defaults to the first element of DegreeTypes. (I can subsequently set it to any of the 3 choices in the intance's Properties sheet.) What am I missing? Darran.

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