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• .net byte[] to List<List<Point>>

  - by user1112111

  Is is possible to convert a byte array back to a List<List<Point>> ? LE: I am saving the List<List<Point>> in a database BLOB field. When I retrieve it, I want to convert it back to a List<List<Point>>. So I have the byte[], but I cannot figure out how to convert it. How should the de/serialization look like ?

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• Converting a large SQL Server Database to Azure Storage

  - by Laith

  Hi guys, I have a very large database structure, (Data is not important at this point, I can migrate the info in the db pretty easily if the structure is done) , all reside in SQL Server and I even published it to SQL Azure, but thinking about the limitation of SQL Azure in size, made me decide to switch most of the tables that do not need all the bells and whistles of SQL Azure to Azure Table and blob storage. I was thinking of creating a TT template that dose that, but was wondering if their is a tool that do that. Any ideas or thoughts. The only tables that i would keep in SQL Azure would anything related to transactions like payments. Appreciate your thoughts and advice

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• PERSISTENCE LOB WITH JPA

  - by rfders

  Hi, Folks. I have this problem using JBOSS, EJB3 and MSSQL Express . i'm trying to persist an entity with an Blob attribute which was converted into a byte[], apparently it create the entity perfectly, no error was logged at jboss's console. but when i check into database the column is null. i already checked the Object to byte[] method and it is fine. i tried assigning Image and varbinary(Max) data type to this column. so i really don't know what it happening, why the column is not inserted into database. thanks a lot.

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• Anyone using NoSQL databases for medical record storage?

  - by Brian Bay

  Electronic Medical records are composed of different types of data. Visit information ( date/location/insurance info) seems to lend itself to a RDMS. Other types of medical infomation, such as lab reports, x-rays, photos, and electronic signatures, are document based and would seem to be a good candidate for a 'document-oriented' database, such as MongoDB. Traditionally, binary data would be stored as a BLOB in a RDBMS. A hybrid approach using a traditional RDBMS along with a 'document-oriented' database would seem like good alternative to this. Other alternative would be something like DB2 purexml. The ultimate answer could be that 'it depends', but I really just wanted to get some general feedback/ideas on this. Is anyone using the NoSql approach for medical records?

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• Trouble with Powershell and running a complex commandline

  - by Frank Rosario

  Hi, I've been trying to run the following command line from a Powershell build script we have; but keep running into issues & 'C:\Dev\Yadda\trunk\BuildScripts\U tilities\csmanage.exe' /create-deployme nt /name:yadddayaddyaddadev /label:yadddayaddyaddadev /package:https://yadddayaddyadda.blob.core.windows.net/mydeployments/20100426_202848_FamilyMoments.cspk g /config:C:\Dev\WalmartOne\trunk\yadddayaddyadda.CloudService\bin\Debug\ServiceCon figuration.cscfg /slot:Staging /hosted-service:yadddayaddyadda-dev" Note: the space in "Utilities" is intentional; trying to snif out a bug involving spaces in the executable path. I assure you, the path does exist with the space in it on my machine. What's the best way to call this command line from Powershell? I've tried Invoke-Expression, Diagnostic.Process::Start, &; each method coming up with some different type of error; usually that it could find the executable. Any constructive input is greatly appreciated. Thanks.

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• What is the correct way to backup ZODB blobs?

  - by joeforker

  I am using plone.app.blob to store large ZODB objects in a blobstorage directory. This reduces size pressure on Data.fs but I have not been able to find any advice on backing up this data. I am already backing up Data.fs by pointing a network backup tool at a directory of repozo backups. Should I simply point that tool at the blobstorage directory to backup my blobs? What if the database is being repacked or blobs are being added and deleted while the copy is taking place? Are there files in the blobstorage directory that must be copied over in a certain order?

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• uzing libgz to inflate a gz input

  - by Pierre

  Hi all, I'm currently trying to use the zlib to inflate a source of gzipped data. It seems that the inflate API in zlib cannot inflate a gzipped data ( The example http://www.zlib.net/zpipe.c fails to read a gzipped file: "zpipe: invalid or incomplete deflate data" ). I noticed that there is a gzopen function in this API, but , as far as I understand, it only works with a filename or a file descriptor. Can I use this API if my source of gzipped data is stored in memory, in a sql blob, etc... ? Many Thanks Pierre

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• help configuring openid for enki blog in ruby on rails

  - by Stacia

  I am trying to set up a blog using Enki. There is a config file here: http://github.com/xaviershay/enki/blob/master/config/enki.yml Which I don't understand. I signed up for myopenID and replaced my username in the delegate, but I don't understand what goes under "open_id" - is it just my URL? I'm just not sure what's going on, or what name I should put in the admin page at all (is it the username at myopenID?). I may have it all right, but I keep getting "OpenID server not found" so something is going wrong on both my local and remote server.

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• Video not playing in IE in hidden div using JW Player, SWFObject and FancyZoom

  - by lgomez

  Hi all, I have a video that is meant to start playing when a user clicks on an image and said image opens a FancyZoom overlay. It works fine in every browser except IEs. If I place the video in a div that is not hidden (display:none actually), the video starts as expected. So it seems there is a problem with either Flash, JW Player, SWFObject or any combination of these when trying to load a video in a hidden div. Anyone know any workarounds? I tried modifying the FancyZoom library (see my fork: http://github.com/lgomez/fancy-zoom/blob/master/prototype/js/fancyzoom.js) so I could use a callback to inject the video AFTER the zoom effect was completed but that did'n work. Thanks!

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• Windows Azure: need to know the data processing time

  - by veda

  I have stored some files in the form of blobs on azure and I have written an application that would access these blobs. When I host this application as a web role on azure, it works perfectly and I am happy with that. But now, I wanted to know “what is the query time taken to access each blob file?” I was searching for this through the Microsoft Azure Storage SLA and I found that for GetBlob request type, the maximum processing time should be within the product of 2 seconds multiplied by the number of MBs transferred in processing the request. I am still unclear. What is the actual processing time of my data query? How can I measure it? Can I be able to speed up the processing time? I can understand that the processing time depends on internet speed, location of the data center where my data is being stored, and location of data center where my application is being hosted. But still, will I be able to speed up my query?

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• regex to match postgresql bytea

  - by filiprem

  In PostgreSQL, there is a BLOB datatype called bytea. It's just an array of bytes. bytea literals are output in the following way: '\\037\\213\\010\\010\\005`Us\\000\\0001.fp3\'\\223\\222%' See PostgreSQL docs for full definition of the format. I'm trying to construct a Perl regular expression which will match any such string. It should also match standard ANSI SQL string literals, like 'Joe', 'Joe''s Mom', 'Fish Called ''Wendy''' It should also match backslash-escaped variant: 'Joe\'s Mom', . First aproach (shown below) works only for some bytea representations. s{ ' # Opening apostrophe (?: # Start group [^\\\'] # Anything but a backslash or an apostrophe | # or \\ . # Backslash and anything | # or \'\' # Double apostrophe )* # End of group ' # Closing apostrophe }{LITERAL_REPLACED}xgo; For other (longer ones, with many escaped apostrophes, Perl gives such warning: Complex regular subexpression recursion limit (32766) exceeded at ./sqa.pl line 33, < line 1. So I am looking for a better (but still regex-based) solution, it probably requires some regex alchemy (avoiding backreferences and all).

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• Explaining training method for AdaBoost algorithm

  - by konzti8

  Hi, I'm trying to understand the Haar feature method used for the training step in the AdaBoost algorithm. I don't understand the math that well so I'd appreciate more of a conceptual answer (as much as possible, anyway). Basically, what does it do? How do you choose positive and negative sets for what you want to select? Can it be generalized? What I mean by that is, can you choose it to find any kind of feature that you want no matter what the background is? So, for example, if I want to find some kind of circular blob - can I do that? I've also read that it is used on small patches for the images around the possible feature - does that mean you have to manually select that image patch or can it be automated to process the entire image? Is there matlab code for the training step? Thanks for any help...

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• IOError: [Errno 13] Permission denied when trying to read an file in google app engine

  - by mahesh

  I want to read an XML file and parse it, for that I had used SAX parser which requires file as input to parse. For that I had stored my XML file in Entity called XMLDocs with following property XMLDocs Entity Name name : Property of string type content : property of blob type (will contain my xml file) Reason I had to store file like this as I had not yet provide my billing detail to google Now when I try to open this file in my I am getting error of permission denied.. Please help me, what I have to do... You can see that error by running my app at www.parsepython.appspot.com

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• DNSSD Crash error tells me to use native Avahi API instead of Bonjour layer. How do I do this?

  - by Poul

  I get this error trying to run the example script here: http://github.com/tenderlove/dnssd/blob/master/sample/register.rb It says I am using a Bonjour Compatibility Layer and I should use the native api. How do I switch the dnssd ruby gem over to using this? *** WARNING *** The program 'ruby1.8' called 'DNSServiceAddRecord()' which is not supported (or only supported partially) in the Apple Bonjour compatibility layer of Avahi. *** WARNING *** Please fix your application to use the native API of Avahi! *** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=ruby1.8&f=DNSServiceAddRecord>

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• Using Mapped Memory Files in C# to store reference types

  - by Khash

  I need to store a dictionary to a file as fast as possible. Both key and value are objects and not guaranteed to be marked as Serializable. Also I prefer a method faster than serializing thousands of objects. So I looked into Mapped Memory Files support in .NET 4. However, it seems MemoryMappedViewAccessor only allows storage of structs and not reference types. Is there a way of storing the memory used by a reference type of a file and reconstructing the object from that blob of memory (without binary serialization)?

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• Problem in displaying the movie file in silverlight

  - by BALAMURUGAN

  I am developing a portal for online theatre system. I will show the movie in online website daily in shows(like 6-10 PM Shows). I am using Silverlight to display the video in web application. I am holding my movie file in Windows Azure Blob. I am having a problem displaying the movie file. Consider if ay user login to web system @6 The movie will show from starting.. If the user login to the system @7 the movie should start whats going now in the screen for other user not from the begining of the movie. How can I achieve tis.

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• svn cat for git

  - by sanxiyn

  I am looking for the equivalent of svn cat in git. Yes, I am aware that the similar question was asked here. The answer is to use git show rev:path. However, svn cat can be used for the remote repository. That is, I can do svn cat url@rev and get the file from the specified revision of the remote repository, without getting the whole repository. My understanding is that git show only applies to the local repository. A workaround I found is to use gitweb interface to get the blob.

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• Pre-crash iphone symptoms - odd user position, volume change

  - by BankStrong

  I'm seeing intermittent strange symtoms in my app: Blue blob (user position in MKMapView) starts "exploding" (odd, jerky animation). Can begin at startup and seems to indicate eventual problems. Speaker volume suddenly increases (back to level before I invoked kAudioSessionSetProperty_OtherMixableAudioShouldDuck). The app keeps running, but this change tells me to expect no more sounds from AVAudioPlayer. Also a reliable indicator of a future crash (on save, etc). I'm having trouble provoking this in the debugger (seems to only happen with movement in GPS). Any ideas to track it down?

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• GAE images.resize with fixed proportional crop

  - by user288541

  I need to resize and crop to exactly 60x80px from various size and aspect ratio. Just before i put into Datastore. Anyone already got this issue resolved. Currently i already succed to just transform it to exact height (80px) with various width which nott look so good when i try to display it on a list. e.g jcaroussel. My db.put code is like bellow: if users.get_current_user(): personal.personal_id = int(self.request.get('personal_id')) personal.name = self.request.get('name') personal.latitude = self.request.get('latitude') personal.info = self.request.get('info') photo = images.resize(self.request.get('img'), 0, 80) personal.photo = db.Blob(photo) personal.lc_id = int(self.request.get('lc_id')) personal.put() self.redirect('/admin/personal') else: self.response.out.write('I\'m sorry, you don\'t have permission to add this LP Personal Data.') I just want to do similar result when we upload our avatar on google talk/google chat. Anyone solved this? Thx

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• IIS7 - Specifying content-length header in ASP causes "connection reset" error

  - by MisterZimbu

  I'm migrating a series of websites from an existing IIS5 server to a brand new IIS7 web server. One of the pages pulls a data file from a blob in the database and serves it to the end user: Response.ContentType = rs("contentType") Response.AddHeader "Content-Disposition", "attachment;filename=" & Trim(rs("docName"))&rs("suffix")' let the browser know the file name Response.AddHeader "Content-Length", cstr(rs("docsize"))' let the browser know the file size Testing this in the new IIS7 install, I get a "Connection Reset" error in both Internet Explorer and Firefox. The document is served up correctly if the Content-Length header is removed (but then the user won't get a useful progress bar). Any ideas on how to correct this; whether it be a server configuration option or via code? Thanks.

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• Vim: Delete Buffer When Quitting Split Window

  - by Rafid K. Abdullah

  I have this very useful function in my .vimrc: function! MyGitDiff() !git cat-file blob HEAD:% > temp/compare.tmp diffthis belowright vertical new edit temp/compare.tmp diffthis endfunction What it does is basically opening the file I am currently working on from repository in a vertical split window, then compare with it. This is very handy, as I can easily compare changes to the original file. However, there is a problem. After finishing the compare, I remove the split window by typing :q. This however doesn't remove the buffer from the buffer list and I can still see the compare.tmp file in the buffer list. This is annoying because whenever I make new compare, I get this message: Warning: File "temp/compare.tmp" has changed since editing started. Is there anyway to delete the file from buffers as well as closing the vertical split window?

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• ruby c extensions: character values over 127

  - by Adrian

  I am trying to make a C extension for Ruby that includes a method returning a string, which will sometimes have character values that need to be in an unsigned char. In http://github.com/shyouhei/ruby/blob/trunk/README.EXT, all of the functions listed for turning C strings into Ruby strings take signed chars. So I couldn't do this: unsigned char bytes[] = {0xf0, 0xf1, 0xf2}; return rb_str_new(bytes, 3); How could I make a method that returns these types of strings? In other words, how would I make a C extension with a method returning "\xff"?

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• Compressing large text data before storing into db?

  - by Steel Plume

  Hello, I have application which retrieves many large log files from a system LAN. Currently I put all log files on Postgresql, the table has a column type TEXT and I don't plan any search on this text column because I use another external process which nightly retrieves all files and scans for sensitive pattern. So the column value could be also a BLOB or a CLOB, but now my question is the following, the database has already its compression system, but could I improve this compression manually like with common compressor utilities? And above all WHAT IF I manually pre-compress the large file and then I put as binary into the data table, is it unuseful as database system provides its internal compression?

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• Send a "304 Not Modified" for images stored in the datastore

  - by Emilien

  I store user-uploaded images in the Google App Engine datastore as db.Blob, as proposed in the docs. I then serve those images on /images/<id>.jpg. The server always sends a 200 OK response, which means that the browser has to download the same image multiple time (== slower) and that the server has to send the same image multiple times (== more expensive). As most of those images will likely never change, I'd like to be able to send a 304 Not Modified response. I am thinking about calculating some kind of hash of the picture when the user uploads it, and then use this to know if the user already has this image (maybe send the hash as an Etag?) I have found this answer and this answer that explain the logic pretty well, but I have 2 questions: Is it possible to send an Etag in Google App Engine? Has anyone implemented such logic, and/or is there any code snippet available?

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• SQLITE basic syntax

  - by Doori Bar

  I seem to misunderstand a basic syntax, why this sample works: sqlite3_prepare_v2(db, "insert into test values('boo','boo',0);", strlen(querystring)+1 , &stmt, NULL); if ((rc = sqlite3_step(stmt)) != SQLITE_DONE) fprintf(stderr, "Error: sqlite3_step() %d. Error Message %s;\n",rc,sqlite3_errmsg(db)); But when I try this query: "insert into test(strtest) values('boo');" I get an error: Error: sqlite3_step() 19. Error Message constraint failed; What am I missing? table test is: "create table test (blobtest BLOB(4) NOT NULL, strtest VARCHAR NOT NULL, inttest INTEGER NOT NULL );" Thanks, Doori Bar

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