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• Statement hierarchy in programming languages

  - by sudo

  I quickly wrote an interpreter for some sort of experimental programing language i came up with, in PHP (yes, in PHP). The language itself doesn't have anything really special, I just wanted to give it a try. I got the basic things working (Hello World, input to output, string manipulation, arithmetics) but I'm getting stuck with the management of blocks and grouped statements. What I mean is: PHP and most other languages let you do this: ((2+2)*(8+2)+2), of course not only with mathematical computations. My program structure currently consists of a multidimensional array built like this: ID => Type (Identifier, String, Int, Newline, EOF, Comma, ...) Contents (If identifier, int or string) How could I allow statements to be executed in a defined order like in the PHP example above?

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• Multilingual best practices on SQL Server, EF and MVC combinations

  - by dengereli

  ASP.NET MVC, resource management is look like enough for application multlingual multiculture support. But I am wondering practices about data. User stories; User set culture as en-US and see all product items in English. User set culture as fr-FR and see all product items in French. User set culture as ru-RU and see all product items in Russian. User doesn't have right change culture settings and application never reach multilingual resources, it will use default language and culture.

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• understanding silverlight resource file format

  - by Quincy

  I'm trying to understand the format of silverlight resource files. There are 4 bytes of the data comes after PAD. I'd like to know what these values are, and how they are generated. here is the hex dump of a .g.resources file. Here is what I know: there is 0xbeefcace at the beginning, then there is dependancies, then padding. after that is the great unknown (but I really like to know). After 4 null bytes, are the file name and size of the resource. and After that is content of the said file. I'm not that familiar with .Net and silverlight resource management. would someone please tell me what the mystical 4 bytes are, or point me the url to the specification doc or something. Any help would be appreciated!

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• Version control for Adobe Flash projects

  - by Guss

  I'm working with a very complex Flash project which is part of a full range of services that we deploy for the use of our clients. For most of our software sources (Java, PHP, Javascript, HTML and a some supporting scripts in other languages) we use subversion for version control and management, so we do the same for our Flash projects, even though we gain little benefits from version controlling that (except being able revert to previous versions) as FLA files are stored as just binaries which we cannot get meaningful diffs from. We're putting as much code as we can into AS files which we can properly manage using subversion, but due to the requirements of our architecture and our deployment strategy (both we cannot change because of our clients needs), we still maintain a large collection of FLA files that we need to manage. I've looked at Adobe Version Cue and while I do not really understand what it does in terms of version control, will moving our Flash projects to hosting on Version Cue will give me better control then I currently get from Subversion? Also - if people can share their experience and suggestions regarding version control of Flash projects, it will be very helpful.

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• How to organize code using an optional assembly reference?

  - by apoorv020

  I am working on a project and want to optionally use an assembly if available. This assembly is only available on WS 2008 R2, and my ideal product whould be a common binary for both computers with and without the assembly. However, I'm primarily developing on a Windows 7 machine, where I cannot install the assembly. How can I organize my code so that I can (with minimum changes) build my code on a machine without the assembly and secondly, how do I ensure that I call the assembly functions only when it is present. (NOTE : The only use of the optional assembly is to instantiate a class in the library and repeatedly call a (single) function of the class, which returns a boolean. The assembly is fsrmlib, which exposes advanced file system management operations on WS08R2.) I'm currently thinking of writing a wrapper class, which will always return true if the assembly is not present. Is this the right way to go about doing this?

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• What first game did you program, and did it make you a better developer?

  - by thenonhacker

  What first game did you program? Name your game, the OS and language, and even a Website URL to get your game. Old DOS Games and Flash Games with ActionScript are allowed. Game kits are allowed, too. ...and did it make you a better developer? Programming games can be addicting, and it will bring out the best in us as we create our first game. What lessons did you learn form most? Algorithm and/or AI's? Graphics? User Interface? File Formats and Data Storage? Project and Time Management? Can you say that because you practiced programming by creating this game, you became more immersed with the programming language you used and helped you become a better developer?

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• drupal bootstrap script: how to get list of all nodes of type x?

  - by groovehunter

  hi. I create a custom import and export, at the moment as an external script (via bootstrap), i plan to create a module in a more generic fashion lateron. I am building a frontend for nagios and for our host management and nagios configuration btw. Maybe it might become useful for other environments (networkmanagement) Now i need to know how to get list of all nodes of type x? I want to avoid direct SQL. A suggestion i got was to make an rss and parse it but i acess the drupal db a dozen times to extract various nodes, so it feels strange to do a web request for one thing So what i am looking for as newbie drupal dev is just a pointer to basic search module api for this task TIA florian

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• Execute Oracle RAC cluster commands via Solaris RBAC?

  - by David Citron

  Executing Oracle RAC cluster management commands such as $ORA_CRS_HOME/bin/crs_start requires root permissions. Using Solaris RBAC (Role-Based Access Control), one can give a non-root user permissions to execute those commands, but the commands still fail internally. Example: $pfexec /opt/11.1.0/crs/bin/crs_stop SomeArg CRS-0259: Owner of the resource does not belong to the group. Is there a complete RBAC solution for Oracle RAC or does the executor need to be root? EDIT: Note that my original /etc/security/exec_attr contained: MyProfile:suser:cmd:::/opt/11.1.0/crs/bin/crs_start:uid=0 MyProfile:suser:cmd:::/opt/11.1.0/crs/bin/crs_start.bin:uid=0 As Martin suggests below, this needed to be changed to add gid=0 as: MyProfile:suser:cmd:::/opt/11.1.0/crs/bin/crs_start:uid=0;gid=0 MyProfile:suser:cmd:::/opt/11.1.0/crs/bin/crs_start.bin:uid=0;gid=0

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• building a web application in eclipse

  - by Noona

  As a concluding assignment for the technologies taught in a data management course, we have to write a web application using the technologies taught throughout the course, this mostly includes xhtml, css, JSP, servelets, JDBC, AJAX, webservices. the project will eventually be deployed using tomcat. we are given the option of choosing the technologies that we see fit. since this is my first time developing a web application I am having some uncertainties about where to start, so for example now I am writing the object classes that will be used in the database and implementing the operations that will be performed on the database, but I am not sure about how to make these operations available to a client through the website, I mean I think I have to write a servlet through which I can extract the request parameters and set the response accordingly, but I would still like a more specific overview of what I am going to do, so if someone can link me to a tutorial with an example that makes use of these technologies while illustrating the stages of the design so that I can see how all these things are linked together in a web project. thanks

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• ASP.NET and SQL server with huge data sets

  - by Jake Petroules

  I am developing a web application in ASP.NET and on one page I am using a ListView with paging. As a test I populated the table it draws from with 6 million rows. The table and a schema-bound view based off it have all the necessary indexes and executing the query in SQL Server Management Studio with SELECT TOP 5 returned in < 1 second as expected. But on the ASP.NET page, with the same query, it seems to be selecting all 6 million rows without any limit. Shouldn't the paging control limit the query to return only N rows rather than the entire data set? How can I use these ASP.NET controls to handle huge data sets with millions of records? Does SELECT [columns] FROM [tablename] quite literally mean that for the ListView, and it doesn't actually inject a TOP <n> and does all the pagination at the application level rather than the database level?

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• iptables : how to correctly allow incoming and outgoing traffic for certain ports?

  - by Rubytastic

  Im trying to get incoming and outgoing traffic to be enabled on specific ports, because I block everything at the end of the iptables rules. INPUT and FORWARD reject. What would be the appropiate way to open certain ports for all traffic incoming and outgoing? From docs I found below but one has to really define both lines? iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT I try to open ports for xmpp service and some other deamons running on server. Rules: *filter # Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT -d 127.0.0.0/8 -j REJECT # Accept all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow all outbound traffic - you can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allow HTTP # Prevent DDOS attacks (http://blog.bodhizazen.net/linux/prevent-dos-with-iptables/) # Disallow HTTPS -A INPUT -p tcp --dport 80 -m state --state NEW -m limit --limit 50/minute --limit-burst 200 -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -m limit --limit 50/second --limit-burst 50 -j ACCEPT -A INPUT -p tcp --dport 443 -j DROP # Allow SSH connections # The -dport number should be the same port number you set in sshd_config -A INPUT -p tcp -s <myip> --dport ssh -j ACCEPT -A INPUT -p tcp -s <myip> --dport 5984 -j ACCEPT -A INPUT -p tcp --dport ssh -j REJECT # Attempt to block portscans # Anyone who tried to portscan us is locked out for an entire day. -A INPUT -m recent --name portscan --rcheck --seconds 86400 -j DROP -A FORWARD -m recent --name portscan --rcheck --seconds 86400 -j DROP # Once the day has passed, remove them from the portscan list -A INPUT -m recent --name portscan --remove -A FORWARD -m recent --name portscan --remove # These rules add scanners to the portscan list, and log the attempt. -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP # Stop smurf attacks -A INPUT -p icmp -m icmp --icmp-type address-mask-request -j DROP -A INPUT -p icmp -m icmp --icmp-type timestamp-request -j DROP -A INPUT -p icmp -m icmp -j DROP # Drop excessive RST packets to avoid smurf attacks -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT # Don't allow pings through -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP # Log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT

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• wanting to move up from ms access, thinking .net? visual studio?

  - by Tristan Lear

  So I wrote a project-management program for a small business using Microsoft Access 2007. Now they've requested lots of additional features (timekeeping, privileged data tiers ...) I personally use Linux, but the whole office uses Windows. I'm relatively new to programming but like to teach myself using projects like this. I'm right on the edge on this -- I can't really tell what the path of least resistance here is: do I stay in access + VBA and teach myself a dying, annoying language -- while struggling against all the limitations of Access? Or do I move to something else? Python seems simple enough ... Whatever I use, i need to be able to offer a GUI.

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• How do i get out of the habit of procedural programming and into object oriented programming?

  - by Shadi Almosri

  Hiya all, I'm hoping to get some tips to kinda help me break out of what i consider after all these years a bad habit of procedural programming. Every time i attempt to do a project in OOP i end up eventually reverting to procedural. I guess i'm not completely convinced with OOP (even though i think i've heard everything good about it!). So i guess any good practical examples of common programming tasks that i often carry out such as user authentication/management, data parsing, CMS/Blogging/eComs are the kinda of things i do often, yet i haven't been able to get my head around how to do them in OOP and away from procedural, especially as the systems i build tend to work and work well. One thing i can see as a downfall to my development, is that i do reuse my code often, and it often needs more rewrites and improvement, but i sometimes consider this as a natural evolution of my software development. Yet i want to change! to my fellow programmers, help :) any tips on how i can break out of this nasty habbit?

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• Which is best Postfix Log analyzer?

  - by Anto Binish Kaspar

  Which is best Postfix Log analyzer? We are looking for good log analyzer for postfix. We need to analyze the following How many mails queued ? How many mails not delivered ? Why mails are not delivered ? And is it possible to view the subject for the all mail status instead of message id? I mean to review the status of the single mail. We are using Sawmill analyzer now. But the management is not satisfied with the report from the sawmaill, since its missing single message status and subject.

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• Articles about replication schemes/algorithms?

  - by jkff

  I'm designing an hierarchical distributed system (every node has zero or more "master" nodes to which it propagates its current data). The data gets continuously updated and I'd like to guarantee that at least N nodes have almost-current data at any given time. I do not need complete consistency, only eventual consistency (t.i. for any time instant, the current snapshot of data should eventually appear on at least N nodes. It is tricky to define the term "current" here, but still). Nodes may fail and go back up at any moment, and there is no single "central" node. O overflowers! Point me to some good papers describing replication schemes. I've so far found one: Consistency Management in Optimistic Replication Algorithms

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• Why do Java/C# edge out C++ as the recommended language to learn OOP on S.O?

  - by viksit

  I noticed after reading the answers/discussion to this question (What is the best language to learn OOP on?) - that more and more people are recommending C# or Java over C++ to learn OOP on. A simple term search on that answer page results in 10 hits for C++, 21 for C# and 27 for Java. Now, I understand that these 2 languages fix a lot of quirks and issues with C++, and looked up these resources that relate mostly to performance, JVM vs native implementation, systems focus vs applications, manual memory management vs automated et al. My question is - are there any fundamental differences in the OO capabilities of Java/C# vs C++? Or are the former recommended purely due to their generic ease of use/improvements over the latter? Thanks. PS, I'm aware of Java interface inheritance vs C++ multiple inheritance as a difference. I would consider that an implementational one rather than functional.

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• Metadata requirements for developers

  - by Paul James

  I'm tasked with providing a list of metadata requirements our data warehouse developers might need. This is not the business metadata (nice descriptions etc), but rather data required for change management (also known as impact assesment), data lineage etc. I've seen this article Meta Meta Data Data - Ralph Kimball but as I'm not the first person to do this I'm throwing it to the SO community. The actual question is this: What metadata do datawarehouse developers require to design, develop and manage change in ETL routines? PS: I'm trying to keep the answer platform agnostic but for context this is an Oracle database with PL/SQL and Datastage.

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• Creating an Extremely Large Index in Oracle

  - by Rudiger

  Can someone look at the linked reference and explain to me the precise statements to run? Oracle DBA's Guide: Creating a Large Index Here's what I came up with... CREATE TEMPORARY TABLESPACE ts_tmp TEMPFILE 'E:\temp01.dbf' SIZE 10000M REUSE AUTOEXTEND ON EXTENT MANAGEMENT LOCAL; ALTER USER me TEMPORARY TABLESPACE ts_tmp; CREATE UNIQUE INDEX big_table_idx ON big_table ( record_id ); DROP TABLESPACE ts_tmp; Edit 1 After this index was created, I ran an explain plan for a simple query and get this error: ORA-00959: tablespace 'TS_TMP' does not exist It seems like it's not temporary at all... :(

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• Caching roles in a cookie

  - by AspOnMyNet

  1) a) I assume roles are cached ( by setting Roles.CacheRolesInCookie ) only for current user? b) Besides Roles.GetRolesForUser(_currentUser), are there any other methods that will read role information for current user from role cookie and thus won’t have to connect to the data base? 2) a) I assume that normally role cookie gets updated only when current user is added or removed from the role(s) or when the cookie expires? b) Because role names can be cached apart from the data source, it is possible that changes to role management at the data source would not be reflected in the cached values. In this case, the user must close and re-open their browser to clear the cached cookie value. How exactly could role cookie get cached apart from the data source? 3) If the number of roles cached in a role cookie equals the value of Roles.MaxCachedResults, then I assume when Roles.GetRolesForUser (_currentuser) gets called, it will need to check the DB to see whether user is also a member of any additional roles? thanx

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• addObjectsFromArray

  - by derek.lo

  I have a question about memory management when using the addObjectsFromArray method. Basically, I have 2 arrays defined in the appDelegate. I need these 2 arrays for the duration of my application's runtime. I therefore release them in my appDelegate's dealloc method. When I go to use these two arrays in a class, I want one array to store the values from the other, so that the other can have it's contents removed, but still stick around for use. Something like this: [appDelegate.arrayTwo addObjectsFromArray:appDelegate.arrayOne]; [appDelegate.arrayOne removeAllObjects]; I'm getting the compiler error: EXC_BAD_ACCESS because of a pointer issue? retaining issue? Any help would be greatly appreciated! Thanks

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• SQL Server: How to remove empty lines in SSMS?

  - by atricapilla

  I have many .sql files with lots of empty lines e.g. WITH cteTotalSales (SalesPersonID, NetSales) AS ( SELECT SalesPersonID, ROUND(SUM(SubTotal), 2) FROM Sales.SalesOrderHeader WHERE SalesPersonID IS NOT NULL GROUP BY SalesPersonID ) SELECT sp.FirstName + ' ' + sp.LastName AS FullName, sp.City + ', ' + StateProvinceName AS Location, ts.NetSales FROM Sales.vSalesPerson AS sp INNER JOIN cteTotalSales AS ts ON sp.BusinessEntityID = ts.SalesPersonID ORDER BY ts.NetSales DESC Is ther a way to remove these empty lines in SQL Server Management Studio? This is what I would like to have: WITH cteTotalSales (SalesPersonID, NetSales) AS ( SELECT SalesPersonID, ROUND(SUM(SubTotal), 2) FROM Sales.SalesOrderHeader WHERE SalesPersonID IS NOT NULL GROUP BY SalesPersonID ) SELECT sp.FirstName + ' ' + sp.LastName AS FullName, sp.City + ', ' + StateProvinceName AS Location, ts.NetSales FROM Sales.vSalesPerson AS sp INNER JOIN cteTotalSales AS ts ON sp.BusinessEntityID = ts.SalesPersonID ORDER BY ts.NetSales DESC

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• Any good GUI tool to easily create stored procs SQL server 2008 ?

  - by Munish Goyal

  The templates for stored-procs in SSMS do not auto-populate all input columns, again there is manual work involved. I am looking for something like right-click on table and say CREATE stored-proc, and then it allows to pick a template, based on which it can populate the parameters etc. and give check-box in GUI (like table designer, you can easily add/remove a column). Some support for change management with table undergoing alter or otherwise would also be helpful. Currently we manually write all stored-procs, which i think we should be able to save time and labor with automation. Any suggestion on other free 3rd party tools ?

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• Best Work Queue service for distributed clusters

  - by onewheelgood

  Hi there. I require a simple work queue type system for asynchronous task management. I have looked at both beanstalkd and gearman. However, both these seem to assume that the client and the queue server are on the same network, and therefore that there will always be a reliable network between them. I need one that can support the client and server being in different places in the world, and be able to manage temporary loss of network connection between clusters. Ideally, this would work in such a way where I post a job to a local proxy that attempts to send it to the main queue server. If there is no network connection, it would try again later, however it would not lose the job or delay the client. Any recommendations?

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• Are there any Python reference counting/garbage collection gotchas when dealing with C code?

  - by Jason Baker

  Just for the sheer heck of it, I've decided to create a Scheme binding to libpython so you can embed Python in Scheme programs. I'm already able to call into Python's C API, but I haven't really thought about memory management. The way mzscheme's FFI works is that I can call a function, and if that function returns a pointer to a PyObject, then I can have it automatically increment the reference count. Then, I can register a finalizer that will decrement the reference count when the Scheme object gets garbage collected. I've looked at the documentation for reference counting, and don't see any problems with this at first glance (although it may be sub-optimal in some cases). Are there any gotchas I'm missing? Also, I'm having trouble making heads or tails of the cyclic garbage collector documentation. What things will I need to bear in mind here? In particular, how do I make Python aware that I have a reference to something so it doesn't collect it while I'm still using it?

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• Powerpoint file can be deleted without consequence

  - by John Maloney

  I am working on a license management type application that copies a password protected zip file to the applications root. The user clicks a button "Open Presentation" and the zipped file is extracted into the root folder and then I use the Office interop to open the file in Powerpoint. At this point to my surprise I am able to delete the extracted file that is currently open in the Powerpoint application. I had assumed that trying to delete the file would fail as the file is still open in Powerpoint. Why is it allowing me to delete the file? Is the file somehow copied to a temp folder and then opened in PowerPoint? Can I move forward with the application relying on this ability to delete the file as soon as it is opened in Powerpoint? This would be optimal because it helps insure that the file cannot be copied(I am also using the xml to stop "Save As" and "Save" from appearing int Powerpoint). Thanks for the insight, John

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