May 2005 - Zope - Zope lists

PIL: can't call same method twice
by Chris 31 May '05

31 May '05

Hi, I encounter a problem, that I can not explain at all: I have an external method to resize an image (see below). I can call the method without a problem from a script within Zope and it does it's job. Hovever, if I call it twice within the same script, I get the error "can not identify image" although the same FileUpload instance is passed. My (dummy-)script looks something like this: # call the ext. method 'resize' one or more times x=1 # does not work for x >1 image=context.REQUEST.image # passed from a html-form for i in range(0,x): foo = context.resize(image, size=size) the external method 'resize' looks like this: def resize(self, image, size=200, resample='ANTIALIAS'): from PIL import Image image=Image.open(image) [...] I have no idea what the problem could be or where to look. Any advice would be a greate help. Regards Chris

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sending attachments
by Varun Parange 31 May '05

31 May '05

hi, is it possible to send mails with attachments using Zope MailHost?? if so,...how do u achieve it? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Uninstall a zope built from source
by Rob Wilco 31 May '05

31 May '05

Hello, Some time ago, I built zope from the sources and it worked well. Now I prefer the way Debian easily offers instances and an init.d script. I would like to uninstall the Zope from the source bt I can't find a target for make to do an uninstall. I have a googled for a while without success. I have few folders named zope in the /usr/local, /var/lib and i am not always sure they belongs to the source install or the debian version. * Does anyone knows about a uninstall script? * If I have to do it by hand, where can I find docs that tells what to remove? (the install python script is long) How to be sure everything is gone? Have a good day,

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zope server versions and Zopetime() function.
by Hamzat Kamal 30 May '05

30 May '05

Hello all, I was testing zopetime() function on 2 diffrent versions of zope servers, both running on different linux machines and i was getting 2 diffrent results: <dtml-var expr="ZopeTime().toZone('GMT+1').strftime('%d%m%Y %H:%M:%S - %Z')"> On (Zope 2.6.1 (binary release, python 2.1, linux2-x86), python 2.1.3, linux2) the result was : 28052005 12:15:11 - PST which the correct time in GMT+1 While on (Zope 2.7.6-final, python 2.3.5, linux2) the same code was showing : 28052005 03:56:07 - PDT This is not the correct time in GMT+1, but the current time on the server. What should have gone wrong and how do I solve this. Thanks. KAMAL. Internal Virus Database is out-of-date. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 3/18/2005

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Finding an object in a folder
by Allen Huang 30 May '05

30 May '05

Here is the problem. I want to use a form to upload a file (with a specific name) but first I want to check if another file with the same name already exist in that folder. How do I use a if or dtml-if to solve this problem?? --------------------------------- Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard.

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RE: [Zope] zope vs. memory [was Re: Refcounts, ZODB Cache and memory leaks?]
by Dieter Maurer 30 May '05

30 May '05

Please stay on the list! Readded... Dylan Jay wrote at 2005-5-29 23:31 +1000: >> >- Memory grows and mostly doesn't shrink. >> >> That's normal behavior. > >Normal as in desirable or normal as in known bug? Normal as in "extremely difficult to avoid". When you read a book about memory management and look at the operating system provided API for memory management you will understand why. >> >- Its not due to objects that can't be collected by the GC >> >- Its not due to the ZODB cache >> > >> >That leaves the following causes I think >> >- RAMCache etc and module/class variables. Either mine, plone's or >> zope's. If the reference counts as shown by "Control_Panel --> Debug information" do not show them, then the leaked objects are neither class nor "ExtensionClass" instances and are probably elementary Python types. Some moths ago, I found such a leak in the "TempStorage" implementation. However, this is fixed in recent Zope versions (I think since 2.7.5). > ... >> Python has no big chance. The memory management options of the >> underlaying operating systems are quite limited and Python >> uses the C memory management at its lowest level. >> Thus, it must live with what "C" provides. > >I don't really understand the implications of what your saying. Are you >saying that oses don't allow python to free memory? Something like that: "posix" provides two ways to add address space for a process: "brk" and "mmap". "brk" allows to add and release space at the *end* of the address space. You cannot release such space unless a complete range is free at the very end! "mmap" can add (and release) space anywhere but only in large chunks and only at corresponding boundaries. You can use "mmap" only for large memory blocks managed atomically (i.e. allocated and released as a whole). The "C" "malloc" usually uses "brk" to allocate large chunks of memory and subdivides them as needed (for efficiency reasons). While it would be possible to check for the possibility to release such blocks again, it would be expensive (and not so often successful). Therefore, it is rarely done. Read more in a book about memory management! > ... >am I right in saying that using >the catalog involves lots of btree objects which are objects and would not >be affected by the memory issue above? "BTree" objects are objects and would be counted in the "Reference Counts" display of "Control_Panel --> Debug Information". You should be able to detect leaks involving them by analysing this display (do not forget to flush the caches before you trust the reference counts!). > ... >> Did I not tell you about a special Python build to >> analyse memory leaks? > >No. You can build Python to account for any allocated object. However, all extensions must then be build with this same option (otherwise, the object structures do not agree and chaos results). You will need many hours to analyse the thousands of objects to distinguish between the leaked objects and the one rightfully used by the application... -- Dieter

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Re: [Zope] DTML in Zope 2 vs Zope 3
by Jaroslav Lukesh 30 May '05

30 May '05

Dne čtvrtek, 26. května 2005 22:03 Greg Fischer <retheoff(a)gmail.com> napsal(a): > I am just curious, why is DTML not good? It does 9 out of 10 things I > want quite easily. From my perspective, I really dont want to learn > new ways of doing things if this works. I also have no desire to do > templating. I can see the need for it in a large development shop,but > for me, a 1 guy operation, I have no desire to complicate things. > DTML works so easy for me. > > I do use Python scripts here and there for small and odd things that > would be difficult or impossible to do in DTML, but like I said, > that's maybe only 10% max of the functionality that I need to provide. > (probably 5-6%) Having to move everything in Python is a hassle that I > dont plan on doing for a few years. I'll just keep using Zope 2. > > I'd also be curious to know from all you other developers, what > percentage of tasks that you need to perform or functionality you need > to provide can be provided simply with DTML? Like for me, I can do > quickly and easily do 90% of what I need in DTML. > > Is DTML really that much harder to use? > > I understand the whole idea of separating the logic and the > presentation, and I guess, is that part of the reason why DTML is not > as good? But, for me, that separation is more complicated. DTML is > easier for me. (partly because I know it) > > I dont know, DTML and the "everythings an object" concept in Zope are > the very things that make Zope so attractive for a small time operator > like me. I hate to see them deprecated just because it doesnt work > for the larger companies out there. Of course, I may be totally > ignorant about all this, huh? I absolutelly agree with you, it is like my words. But separation of logic and presentation could be done successfully in DTML too. ZPT, which have "separation argument" is not as easy to make totally separated design as marketing says, for example see Plone - try to customize plone site to absolutelly different custom design - it is near impossible. -- Jaroslav Lukesh ----------------------------------------------------------- This e-mail can not contain any viruses because I use Linux

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How to modify 'title' of an object
by Rares Vernica 29 May '05

29 May '05

Hi, How can I modify the 'title' of an object in DTML? Thanks in advance, Rares _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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Receiving mails
by Varun Parange 28 May '05

28 May '05

hi, i have downloaded an SMTP server and using it i can send mails with the help of Zope MailHost.... however i would also like to recieve mails.... how do i do this..... which additional products do i need to download... regards, varun __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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strftime and timezone
by Hong Yaun 28 May '05

28 May '05

My zope application accesses a Postgres table with a timestamp field 'create_date' through ZPsycopgDA and I want to use strftime to format the date the way I like. However, I find that strftime returns a value that is not the same time as the original one, very likely due to some behind-scene timezone adjustment, which I don't understand and don't know how to control. The following PythonScript code is an illustration of my problem: msg=context.get_some_message t=msgs.create_date print t print t.strftime('%Y-%m-%d %H:%M:%S') return printed When called, the script returns: 2005/03/09 03:36:45 US/Central 2005-03-09 17:36:45 The question is, where does the 'create_date' object get the timezone information for the formatting, and how to achieve my desired output, that is '2005-03-09 03:36:45'? By the way, 'create_date' doesn't seem to be a Zope DateTime object, for when I tested with: t=DateTime() print t print t.strftime('%Y-%m-%d %H:%M:%S') The two prints give the same time value. For your information, in my ZPsycopgDA property, I have choosen the option: 'Use Zope's internal DateTime module (instead of mxDateTime)'. My zope version: 2.7.4 under Linux. Thanks for your help. Hong Yuan

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