July 2001 - Zope - Zope lists

External cgi - filesystem
by Philippe Jadin 07 Jul '01

07 Jul '01

Hello, I'm becoming crazy ;-) so I hope my question will be somewhat clear. I'd like to create an external method that get's a zope image object, write it to the filesystem (1), execute an external executable on it (2), and put a resulting file back into zope (3). All this to convert a jpg file to a swf flash file using swift-generator ( www.swift-tools.com fyi) Maybe there are others way to use external cgi with zope and convert to flash, but I have no idea (suggestions welcome!) so my method is like this : --------- def filewrite(self, original_id): #simply testing how to write a file out of zope onto filesystem. import os, string from tempfile import mktemp from cStringIO import StringIO # stolen from the thumbnail example of the zopebook : source_image=getattr(self, original_id) source_file=StringIO(source_image.data) REQUEST=self.REQUEST #create temporary filenames .in file1=mktemp()+ ".in" file2=mktemp()+ ".out" f=open(file1,"w") f.write(source_file.getvalue()) f.close() # that was part (1) # part (2) # os.system("myexternal_soft.exe "+file1+" > "+file2) # f=open(file2,"rt") # lines=f.readlines() # f.close(); # os.unlink(file1) # os.unlink(file2) ------------- Questions : - the first part almost work : I can write an image file to disk if I supply a correct original_id parameter. _BUT_, the file written on disk is corrupted (it's 131 bytes bigger...) - of course I didn't try yet to execute my exe on this file because it is somewhat corrupted, but it *should* work - part (3) is probably not too hard, reading the file outputed by the executable, and doing some sort of manage add product... but if you ave any clue;-) What am I doing wrong? Why do I get strange filesizes? Am I stupid? Those are my today's questions. Thanks a lot ! Philippe Jadin www.123piano.com

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[Ann] Mirrowing Folder: mirrows a subfolder recursively onto another subfolder during traversal
by Dieter Maurer 07 Jul '01

07 Jul '01

Sometimes you have a Web application in several variants. A prominent example is the same application for different languages. In such a case, you will want to separate the common parts out and maintain them just once. Nevertheless, the variant parts should be able to reference the common parts as if they had not been factored out. This situation is the main use case for Mirrowing Folder. A mirrowing folder is a folder that is able to map one subfolder into each of its other subfolders. Under the assumption that all subfolders have essentially the same structure, the subfolders of the mirrowed folder are recursively mapped during traversal onto the corresponding subfolders in the folder selected by the request URL. Content there can access the mirrowed objects (almost) as if they were physically located beside them. Mirrowing Folder is similar to Transparent Folder but what becomes visible depends on the request URL. Therefore, name clashes are less of a problem. More information and download URL:http://www.dieter.handshake.de/pyprojects/zope/MFolder.html Dieter

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What is the best place for an /Images directory ?
by Jeff Hotz 07 Jul '01

07 Jul '01

Would someone please take a minute to explain their recommendation and reasoning behind where best to locate (/usr/local/images, /usr/local/zope/images, /usr/local/zope/var/images) static images? I'm using LocalFile and CoreSession products also. I'm new administering Linux (RedHat 7.1) so any help/theory you can offer will be greatly appreciated. I've created a photo album and display the images using the following code PS - comments on my code are also welcome <dtml-let tmpSesData="ZSessionDataMgr.getSessionData()" yearVar="tmpSesData.get('sSesYear')" sHexMonth="_.string.upper(_.hex(tmpSesData.get('iSesMonth')+1)[2])"> <dtml-in "ZLFSImagePath[yearVar].fileIds()">  <dtml-let iSeqIndex=sequence-index sFileName=sequence-item>   <dtml-if "sFileName[1] == sHexMonth">  <dtml-if "_.divmod(iSeqIndex,thumb_columns)[1] == 0"> <TR> </dtml-if> <TD align="center"> <a href="ZLFSImagePath<dtml-var dir_sep_char><dtml-var yearVar><dtml-var dir_sep_char><dtml-var sFileName>" target="_blank"> <img src="ZLFSImagePath<dtml-var dir_sep_char><dtml-var yearVar><dtml-var thumb_path><dtml-var dir_sep_char><dtml-var thumb_precursor><dtml-var sFileName>.<dtml-var thumb_extension>" alt="<dtml-var sFileName>"> </a> </TD>  <dtml-if "_.divmod(iSeqIndex+1,thumb_columns)[1] == 0"> </TR> </dtml-if> </dtml-if> </dtml-let> </dtml-in> </dtml-let> jeff(a)hotz.net www.hotz.net

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Re: WHY ? -- Performace in serving large media files from ZODB vs from external file system
by Dieter Maurer 07 Jul '01

07 Jul '01

Sedat Yilmazer writes: > In the performance for large image files discussion Dieter Wrote > > > Both will be quite slow when servered by ZServer. > > What could be the reason for being "slow". Since the files are large, > the setup time can be ignored ( time to locate the object) Once the > object is found only thing that remains is the reading the file from DB > ( should be a plain read) and push it to the connection. I do not see a > reason for beeing slow on the db read once the data is located inside > the DB. I have to admit that I did not make any measurements. My remark was based on folkore that Zope is about an order of magnitude slower for static pages than Apache. It may be that the factor is lower for large files. However, when I chased errors in "HTTPResponse.HTTPResponse.write" (back in version 2.1.6), I recognized that such a write does not go straight to the HTTP connection but goes through an intermediate file. Thus, your large file is copied once at the server side before it is streamed out to the browser. And there is some Python code around that controls this buffering. Thus, I expect that ZServer is at least twice as slow as direct serving the file. Dieter

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User Authentication
by Douglas Daniel Del Frari 07 Jul '01

07 Jul '01

Personal Saudacoes! In the application that I am developing, my users will not use the screen of management of zope. Thus, that one would like to make authentication of the users in the similar system that the Zope.Org uses. http://www.zope.org/login.html?came_from=http://www.zope.org/login.html I use " acl_users " of the ZODB. This, possesss some attributes as: " name ", " password ", " confirm ", " roules " and "domains ". I obtained to add to users with methods manipulating these attributes. It would like now, to legalize an user ' xyz ' in zope without using " /manage " for example, and also, without calling the screen authentication standard that is invoked when we have access objects that require " Access contents information ". Somebody worked with authentication of users in the Zope of this form? Somebody could help? It forgives, my English is bad. --------------------------------------- DOUGLAS DANIEL DEL FRARI Graduando em Inform�tica - (UNIJU�/RS) mailto:gaucho@detec.unijui.tche.br http://www.tchezope.cjb.net ---------------------------------------

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Zope monitoring and logging
by Frank Tegtmeyer 07 Jul '01

07 Jul '01

Hi all, while preparing the talk at the Zope conference in Berlin I made heavy updates to my articles about Zope monitoring and logging with daemontools. If anybody is interested: http://www.lightwerk.com/zope/monitoring http://www.lightwerk.com/zope/logging Regards, Frank

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DCOracle2 icons
by Garry Steedman 07 Jul '01

07 Jul '01

Hello all, have just installed DCOracle2 on SuSE 7.1, Zope 2.3.1 (SuSE RPM, uses Python 2.0). Can connect to Oracle 8.1.7 fine, but can't get the icons to display in the management interfaces: anyone have any tips/experience of this? cheers, Garry +-------------------------------------------+ Garry Steedman mailto:gs@styrax.com Styrax Associates http://www.styrax.com/ "The Good Man has no shape." +-------------------------------------------+

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Re: [Zope] is DTML a www standard?
by Bak ＠ kedai 07 Jul '01

07 Jul '01

>All well and good, but the point I am making is one of simplicity of use. >To publish SQL data you have to create an ODBC connection, an SQL Method and >a DTML document at minimum. No matter ho small the report. > >I do realize benefits from the modularity as anyone would. I'm just looking >for a quick hack method to getting data published. Perhaps the better way to >do this is a Wizard concept which creates the necessary elements for you >based on criteria entered. Hmmm... > > if i'm not mistakn ZnolkSQLWizard does that already.

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Python script bug: map
by Li Dongfeng 07 Jul '01

07 Jul '01

Try this simple python script: print map(None, (1,2)) return printed in standalone python this should produce ['1','2'] but in zope-2.4.0b3 we get an error: Error Type: TypeError Error Value: loop over non-sequence a sneak at the code in lib/python/AccessControl/ZopeGuards.py, the error occured in function "guarded_map", the parameter "seqs" should receive "(1, 2)" but instead it received "((1,2),)". This bug is reported to the collector as No. 2382. Li Dongfeng

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ZSQL select on date/time
by Loren Stafford 07 Jul '01

07 Jul '01

Does anyone have a working example of how to select on a date/time column in an MSAccess database. Something like Arguments: FromDate:date select * from "Applicant Database" where [Date Received] > <dtml-sqlvar FromDate type=float> ...except the above syntax produces: Error type: sql.error Error value: ('07001', -3010, '[Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.') ...regardless of value of type. -- Thanks -- Loren

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