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• jabber based server and client application in cocoa

  - by Miraaj

  Hi all, I have implemented an application which supports text chat. Now I want to implement voice chat and later video chat in it, but I have less time provided by client :( So I am planning to go for some open source code in cocoa, which I can use and easily in-corporate in my application. After analysis over net I found that Jabber related client/ chat server application should be best according to my requirements. I have found that there are several jabber based client-server application but mostly written in java, C or C++. Can anyone suggest me some links or code for cocoa based, jabber server and client application?? Also I want to ask that lets say I got server application in C and client application in cocoa, then will I be able to transmit text, multimedia messages between client nodes?? Thanks, Miraaj

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• Finding a pattern within a string variable in C#

  - by lo3

  Ok i'm working on a project for a 200 level C# course, we are required to create a heads or tails project. Basically the project is setup so that the computer will guess randomly up to 5 times, but on the sixth time it will look into the playersGuessHistory variable setup as a string to see if it can find a match for a pattern of 4 entires, if there is a pattern found the computer will guess the next character after the pattern EX: [HHTT]H [HHTTH]H HHTT being the pattern then the computer would guess H for the next turn. My only problem is that i'm having difficulty setting up the project so that it will look through the playersguesshistory and find the patterns and guess the next character in the history. Any suggestions?

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• realistically speaking, could a seasoned .net developer enter the java space and land a job?

  - by mrblah

  I've been working with .net since 2001, and I am considering making a move into the java space. I find that java has so many more mature tools (hibernate is more mature, spring framework, established patters/designs, containers, distributed cache frameworks, etc etc.) I have been doing .net, and just recently I have been getting into design patterns, ORMS, etc. and it just seems the .net side of things are not as mature. Yes the trend going forward looks great as more and more are getting into this design strategy etc. I don't want this to get into a flame war, but I read that its not about the framework/stack, but the tools around it are what make the difference. And to me Java seems to be the winner. Anyhow, the real question here is, could I realistically get into shape in 6 months? i.e. Someone would consider hiring me, and not at a junior dev pay rate? Is this a bad idea?

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• Project roles discovery

  - by Lirik

  I have a school project in which we're going to write a financial engine prototype by a group of 4 people. Most of us have never met each other before, so I'm trying to create a questionnaire to help us find the appropriate roles for each team-member. We have the following responsibilities: Database design Programming User interface design Training Documentation / technical writing Network design Project management Business analysis Testing And we have the following roles: Project Manager Developer Tester Business Analyst Our group has people with various experience: a full-time graduate student, an associate director at the CME (Chicago Mercantile Exchange), full-time professionals, etc. Do any of you know of any tools that would help build a questionnaire or do you have a reference to an online questionnaire that can help us identify the most suitable role(s) for each team member?

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• Handy F# snippets

  - by Benjol

  There are already two questions about F#/functional snippets. However what I'm looking for here are useful snippets, little 'helper' functions that are reusable. Or obscure but nifty patterns that you can never quite remember. Something like: open System.IO let rec visitor dir filter= seq { yield! Directory.GetFiles(dir, filter) for subdir in Directory.GetDirectories(dir) do yield! visitor subdir filter} I'd like to make this a kind of handy reference page. As such there will be no right answer, but hopefully lots of good ones.

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• Are some data structures more suitable for functional programming than others?

  - by Rob Lachlan

  In Real World Haskell, there is a section titled "Life without arrays or hash tables" where the authors suggest that list and trees are preferred in functional programming, whereas an array or a hash table might be used instead in an imperative program. This makes sense, since it's much easier to reuse part of an (immutable) list or tree when creating a new one than to do so with an array. So my questions are: Are there really significantly different usage patterns for data structures between functional and imperative programming? If so, is this a problem? What if you really do need a hash table for some application? Do you simply swallow the extra expense incurred for modifications?

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• Web Services vs Persistent Sockets

  - by dsquires

  I plan on doing a little benchmarking around this question, myself. But I thought it would be good to get some initial feedback from "the community". Has anyone out there done any analysis regarding the pros and cons of these two technologies? My thoughts: Opening and closing TCP/IP connections for web service calls is relatively expensive compared to persistent connections. Dealing with intermittent connection errors and state, etc... would be easier with a web service based framework. You don't see World of Warcraft using web services. One question that I can't seem to find much of answer for anywhere (even on here)... are the limits on the # of persistent connections a single network card can support, etc?

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• ctypes and pointer manipulation

  - by Chris

  I am dealing with image buffers, and I want to be able to access data a few lines into my image for analysis with a c library. I have created my 8-bit pixel buffer in Python using create_string_buffer. Is there a way to get a pointer to a location within that buffer without re-creating a new buffer? My goal is to analyze and change data within that buffer in chunks, without having to do a lot of buffer creation and data copying. In this case, ultimately, the C library is doing all the manipulation of the buffer, so I don't actually have to change values within the buffer using Python. I just need to give my C function access to data within the buffer.

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• Can zlib.crc32 or zlib.adler32 be safely used to mask primary keys in URLs?

  - by David Eyk

  In Django Design Patterns, the author recommends using zlib.crc32 to mask primary keys in URLs. After some quick testing, I noticed that crc32 produces negative integers about half the time, which seems undesirable for use in a URL. zlib.adler32 does not appear to produce negatives, but is described as "weaker" than CRC. Is this method (either CRC or Adler-32) safe for usage in a URL as an alternate to a primary key? (i.e. is it collision-safe?) Is the "weaker" Adler-32 a satisfactory alternative for this task? How the heck do you reverse this?! That is, how do you determine the original primary key from the checksum?

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• Best practices for developing bigger applications on Android

  - by Janusz

  I've already written some small Android Applications, most of them in one Activity and nearly no data that should be persistent on the device. Now I'm writing an application that needs more Activities and I'm a bit puzzled about how to organize all this. My app will download some data parse it show it to the user and then show other activities depending on the data and the user interaction. Some of that data could be cached, some of it has to be downloaded every time. Some of that data should not be downloaded freshly at the moment the orientation changes, but it should on the moment the activity is created... Another thing I'm confused about are things like a httpClient. I now for example create a new httpclient for every activity, the same thing for locationlisteners. Are there books, a blogs or documentations with patterns, examples and advice on organizing larger apps build on android? Everything I found until now are get startet tutorials leaving me alone after 60 lines of code...

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• Tools to test softwares against any attacks for programmers ?

  - by berkay

  in these days, i'm interested in software security. As i'm reading papers i see that there are many attacks and researchers are trying to invent new methods for softwares to get more secure systems. this question can be a general including all types of attacks.There are many experienced programmers in SO, i just want to learn what are using to check your code against these attacks ? Is there any tools you use or you don't care ? For example i heard about,static,dynamic code analysis, fuzz testing. SQL injection attacks Cross Site Scripting Bufferoverflow attacks Logic errors Any kind of Malwares Covert Channels ... ... thanks

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• facing problems while updating rows in hbase

  - by sammy

  Hello i've just started exploring hbase i've run samples : SampleUploader,PerformanceEvaluation and rowcount as given in hadoop wiki: http://wiki.apache.org/hadoop/Hbase/MapReduce The problem im facing is : table1 is my table with the column family column create 'table1','column' put 'table1','row1','column:address','SanFrancisco' hbase(main):020:0 scan 'table1' ROW COLUMN+CELL row1 column=column:address, timestamp=1276351974560, value=SanFrancisco put 'table1','row1','column:name','Hannah' hbase(main):020:0 scan 'table1' ROW COLUMN+CELL row1 column=column:address,timestamp=1276351974560,value=SanFrancisco row1 column=column:name, timestamp=1276351899573, value=Hannah i want both the columns to appear in the same row as a different version similary, if i change the name column to sarah, it shows the updated row.... but i want both the old row and the changed row to appear as 2 different versions so that i could make analysis on the data........ whatis the mistake im making???? thank u a lot sammy

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• How to free up memory?

  - by sarego

  We have been facing Out of Memory errors in our App server for sometime. We see the used heap size increasing gradually until finally it reaches the available heap in size. This happens every 3 weeks after which a server restart is needed to fix this. Upon analysis of the heap dumps we find the problem to be objects used in JSPs. Can JSP objects be the real cause of Appserver memory issues? How do we free up JSP objects (Objects which are being instantiated using usebean or other tags)? We have a clustered Websphere appserver with 2 nodes and an IHS.

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• Logging erros in SqlLite database from C# Windows Forms Application

  - by Ismail S

  I'm developing a win app in C# which communicates to a WCF Service. I want to log exceptions that are thrown on client to be logged in Sql Lite Database (Win app is using Sql Lite database for storing data locally). And then later it should be sent to the wcf service when required so that it can be useful for support/analysis/application improvement. I want a method which can be directly called in every catch block simply by LogHelper.Log(ex). I would like to know if anyone has done it through Enterprise library or used any good practice for such situation?

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• Are government programming jobs good?

  - by Absolute0

  I am a passionate software developer and greatly enjoy programming. However I was recently contacted regarding a developer lead position for a government job at NYC for the fire department. The pay is pretty good, and I would assume the position has good job security and stability. But I am hesitant to even go for an interview as it seems like an exaggerated version of Office Space with a lot of Bureaucracy and mindless paper work. The description is as follows: The Lead Applications Developer, supporting the Programming Group, will be responsible for all phases of the system development life cycle including performing system analysis, requirements definition, database design, preparation of scopes of work, and development of project plans. Supervise programming staff and manage projects involving the design, implementation, maintenance, and enhancement of complex Oracle based user applications using Oracle Development tools. Applications will be deployed using Oracle Application Server utilizing programming languages such as JAVA, JSF, JSP, Oracle ADF, PL/SQL, and XML with J2EE and EJB technology. Anyone with previous government experience can share their two cents on this? Thank you.

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• Django/MySQL - __istartswith not producing case-insensitive query.

  - by TheLizardKing

  I make use of generic views and I am attempting to query my MySQL db (utf8_bin collation) in a case insensitive manor to try to find all my song titles that start with a particular letter. view.py def tracks_by_title(request, starts_with): return object_list( request, queryset = Track.objects.filter(title__istartswith=starts_with), template_name = 'tlkmusic_base/titles_list.html', template_object_name = 'tracks', paginate_by = 25, ) and my urls.py urlpatterns = patterns('tlkmusic.apps.tlkmusic_base.views', (r'^titles/(?P<starts_with>\w)/$', tracks_by_title), ) the query it produces according to the django debug toolbar is: SELECT `tracks`.`id`, `tracks`.`url`, `tracks`.`artist`, `tracks`.`album`, `tracks`.`genre`, `tracks`.`year`, `tracks`.`title`, `tracks`.`comment`, `tracks`.`tracknumber`, `tracks`.`discnumber`, `tracks`.`bitrate`, `tracks`.`length`, `tracks`.`samplerate`, `tracks`.`filesize`, `tracks`.`createdate`, `tracks`.`modifydate` FROM `tracks` WHERE `tracks`.`title` LIKE a% LIMIT 1 specifically this line: WHERE `tracks`.`title` LIKE a% LIMIT 1 Why is it not ILIKE which is what I was expecting by using __istartswith? I am using Django 1.1.1 on Ubuntu.

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• What's the difference between !col and col=false in MySQL?

  - by Mask

  The two statements have totally different performance: mysql> explain select * from jobs where createIndexed=false; +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | 1 | SIMPLE | jobs | ref | i_jobs_createIndexed | i_jobs_createIndexed | 1 | const | 1 | | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ 1 row in set (0.01 sec) mysql> explain select * from jobs where !createIndexed; +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | 1 | SIMPLE | jobs | ALL | NULL | NULL | NULL | NULL | 17996 | Using where | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ Column definition and related index for aiding analysis: createIndexed tinyint(1) NOT NULL DEFAULT 0, create index i_jobs_createIndexed on jobs(createIndexed);

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• Does Extreme Programming Need Diagramming Tools?

  - by Ygam

  I have been experimenting with some concepts from XP, like the following: Pair Programming Test First Programming Incremental Deliveries Ruthless Refactoring So far so good until I had a major stump: How do I design my test cases when there aren't any code yet? From what basis do I have to design them? From simple assumptions? From the initial requirements? Or is this where UML diagrams and the "analysis phase" fits in? Just had to ask because in some XP books I've read, there was little to no discussion of any diagramming tool (there was one which suggested I come up with pseudocodes and some sort of a flowchart...but it did not help me in writing my tests)

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• Programmer's editor or IDE for C code

  - by Yktula

  I feel like this question has been repeated here, but I couldn't find it. What open-source programmer's editor or IDE is best for writing code in C? A GUI and integration with Clang for static code analysis or git for version control would be convenient, but aren't necessary. I would ideally use two editors: one feature-filled IDE and one with a small memory footprint, but editors like jEdit, Geany, Diakonos, nano, etc. don't satisfy many of my needs, which include: Good support for refactoring and code completion. Extensibility in C or a "modern" scripting language (i.e. Ruby or Python) Relatively good performance and lack of bloated-ness

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• Document Stored in File System Text Searching and Filtering required in ASP .Net Application

  - by Harryboy

  Hello Experts, We are building a jobsite application in which we will store resumes of all the candidates, which is planned to store on file system. Now We need to search inside that file and provide the result to the user, we need to provide that what is the best solution to implement text searching. I have just tried to identify it and got some reference like IFilter (API or interface) and Lucene.Net (open source), but not sure that is it a right solution. In initial phase it is expected to be around 50,000 resumes and it should be scalable enough if number increases. I just want some case study or some analysis or your suggestions that which is the best method to handle this requirement (Technology ASP .Net) Thanks

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• It is possible to call a servlet from a Java class?

  - by Renan Mozone

  I'm using IBM WebSphere as my servlet container. My application has several servlets and Java classes. My intent is to call one of those servlets directly from a Java class. Doing some research I figured out that is possible to use the RequestDispatcher interface to achieve this. But it is necessary to pass the objects ServletRequest and ServletResponse as arguments to the method forward(). There is some way to bypass this safely and "nicely"? By "nicely" I meant to say preserving good programming and design patterns.

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• django urls.py regex isn't working

  - by Phil

  This is for Django 1.2.5 and Python 2.7 on Wamp Server running apache version 2.2.17. My problem is that the my URLConf in urls.py isn't redirecting, it's just throwing a 404 error. urls.py: from django.conf.urls.defaults import * # Uncomment the next two lines to enable the admin: #from django.contrib import admin #admin.autodiscover() urlpatterns = patterns('', (r'^app/$', include('app.views.index')), # Uncomment the admin/doc line below to enable admin documentation: #(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: #(r'^admin/', include(admin.site.urls)), ) views.py from django.http import HttpResponse def index(request): return HttpResponse("Hello World") I'm getting the following error: ImportError at /app/ No module named index I'm stumped as I'm only learning Django, can anybody see something wrong with my code? Here's my PythonPath: ['C:\Windows\system32\python27.zip', 'C:\Python27\Lib', 'C:\Python27\DLLs', 'C:\Python27\Lib\lib-tk', 'C:\wamp\bin\apache\Apache2.2.17', 'C:\wamp\bin\apache\apache2.2.17\bin', 'C:\Python27', 'C:\Python27\lib\site-packages', 'c:\wamp\www\seetwo']

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• simpledateformat parsing date with 'Z' literal

  - by DanInDC

  I am trying to parse a date that looks like this: 2010-04-05T17:16:00Z This is a valid date per http://www.ietf.org/rfc/rfc3339.txt. The 'Z' literal "imply that UTC is the preferred reference point for the specified time." If I try to parse it using SimpleDateFormat and this pattern: yyyy-MM-dd'T'HH:mm:ss It will be parsed as a Mon Apr 05 17:16:00 EDT 2010 SimpleDateFormat is unable to parse the string with these patterns: yyyy-MM-dd'T'HH:mm:ssz yyyy-MM-dd'T'HH:mm:ssZ I can explicitly set the TimeZone to use on the SimpleDateFormat to get the expected output, but I don't think that should be necessary. Is there something I am missing? Is there an alternative date parser?

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• Regex - find all phrases except the one including specific word

  - by ekapek

  Hi, I have a text file with text like: "Lorem ipsum text. Second lorem ipsum. How are You. It's ok. Done. Something else now. New line. Halo. Text. Are You ok." I need a regex to find all sentences (between .) except ones with the word "else" within it. I'm trying many regex patterns but nothing works. Can I do this with regex?

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• ExecutionEngineException thrown when loading native dll in c#

  - by Axarydax

  Hi there. I have a 32-bit .net application that uses a native 32-bit DLL via DllImport(). The native DLL is our internal file analysis library, and I need to use it as porting it to C# would be a problem if people update it (other software uses it). The problem is that when I try to execute any method in the native DLL I get a System.ExecutionEngineException thrown. In fact, I've reduced the managed application to a simple tester that just calls a native method, but it still fails. I am on 64-bit Windows 7, but that should not matter as I'm compiling everything as 32-bit binaries. What is also interesting, when I look at the native DLL in the Dependency Walker, it shows that it can't find msvcr90.dll - but when I open any other of our native DLLs in the Dependency Walker, it can find their referenced msvcr90.dll just fine. Can there by some wrongness in the compilation of native DLL that messss up its DLL references?

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