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• Optimal password salt length

  - by Juliusz Gonera

  I tried to find the answer to this question on Stack Overflow without any success. Let's say I store passwords using SHA-1 hash (so it's 160 bits) and let's assume that SHA-1 is enough for my application. How long should be the salt used to generated password's hash? The only answer I found was that there's no point in making it longer than the hash itself (160 bits in this case) which sounds logical, but should I make it that long? E.g. Ubuntu uses 8-byte salt with SHA-512 (I guess), so would 8 bytes be enough for SHA-1 too or maybe it would be too much?

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• Django Asynchronous Processing

  - by freyrs

  Hello all, I have a bunch of Django requests which executes some mathematical computations ( written in C and executed via a Cython module ) which may take an indeterminate amount ( on the order of 1 second ) of time to execute. Also the requests don't need to access the database. Right now everything is synchronous ( using Gunicorn with sync worker types ) but I'd like to make this asynchronous and nonblocking. I am very new to asynchronous Django, and so my question is what is the best stack for doing this. Is this sort of process something a task queue is well suited for? Would anyone recommend Tornado + Celery + RabbitMQ, or perhaps something else? Thanks in advance!

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• Types in Bytecode

  - by HH

  Hey everyone, I've been working for some time on (Java) Bytecode, however, it had never occurred to me to ask why are some instructions typed? I understand that in an ADD operation, we need to distinguish between an integer addition and a FP addition (that's why we have IADD and FADD). However, why do we need to distinguish between ISTORE and FSTORE? They both involve the exact same operation, which is moving 32 bits from the stack to a local variable position? The only answer I can think of is for type-safety, to prevent this: (ILOAD, ILOAD, FADD). However, I believe that type-safety is already enforced at the Java language level. OK, the Class file format is not directly coupled with Java, so is this a way to enforce type-safety for languages that do not support it? Any thought? Thank you.

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• What's the ROI of using a build tool like ant or nant?

  - by leeand00

  To me this sounds like a really stupid question. Why would you not use a build tool? However, I need to explain my co-worker why he should be using a build tool of some sort. He's getting really into the idea of working as a team with more programmers, but he isn't understanding the bigger picture of what needs to change in the build process in order to work with a larger team; (i.e. defensive programming/unit testing your code, having a bug database, programming modular libraries, and using sub-repositories to store modules in version control. This is a rather large stack of technologies that I need to prove the ROI of...so I figured I'd start with the ROI of using a build tool rather than just...say...clicking compile.

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• Redoundant code in exception handling

  - by Nicola Leoni

  Hi, I've a recurrent problem, I don't find an elegant solution to avoid the resource cleaning code duplication: resource allocation: try { f() } catch (...) { resource cleaning code; throw; } resource cleaning code; return rc; So, I know I can do a temporary class with cleaning up destructor, but I don't really like it because it breaks the code flow and I need to give the class the reference to the all stack vars to cleanup, the same problem with a function, and I don't figure out how does not exists an elegant solution to this recurring problem.

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• Avoid copying of data between user and kernel space and vice-versa

  - by bala1486

  Hello, I am developing a active messaging protocol for parallel computation that replaces TCP/IP. My goal is to decrease the latency of a packet. Since the environment is a LAN, i can replace TCP/IP with simpler protocol to reduce the packet latency. I am not writing any device driver and i am just trying to replace the TCP/IP stack with something simpler. Now I wanted to avoid copying of a packet's data from user space to kernel space and vice-versa. I heard of the mmap(). Is it the best way to do this? If yes, it will be nice if you can give links to some examples. I am a linux newbie and i really appreciate your help.. Thank you... Thanks, Bala

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• Maximum Possible File Name Length in Windows Kernel

  - by Lambert

  I was wondering, what is the longest possible name length allowed by the Windows kernel? E.g.: I know the kernel uses UNICODE_STRING structures to hold all object paths, and since the byte length of a wide-character string is stored inside a USHORT, that allows for a maximum path length of 2^15 - 1 characters. Is there a similar, hard restriction on a file name (rather than path)? (I don't care if NTFS or FAT32 imposes a particular restriction; I'm looking for the longest possible theoretically allowed name in the kernel, assuming no additional file system or shell restrictions.) (Edit: For those wondering why this even matters, consider that normally, traversing a directory is achieved by FindFirstFile/FindNextFile calls, one call per file. Given the function named NtQueryDirectoryFile, which is the underlying system call and which returns multiple file names per call, it's actually possible to take advantage of this maximum-length restriction on the path to make an extremely-fast directory traverser that uses solely the stack as a buffer. Now I'm trying to extend that concept, and I need to know the maximum size of a file name.)

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• How does jQuery .data() work?

  - by kazanaki

  My Javascript knowledge is pretty limited. Instead of asking several javascript questions I got the "message" from Stack overflow and started using jQuery right away in order to save me some time. However several times I do not undestand the "magic" behind jQuery and I would love to learn the details. I want to use .data() in my application. The examples are very helpful. I do not understand however WHERE these values are stored. I inspect the webpage with Firebug and as soon as .data() saves an object to a dom element, I do not see any change in Firebug (either HTML or Dom tabs). I tried to look at jQuery source, but it is very advanced for my Javascript knowledge and I lost myself. So the question is: Where do the values stored by jQuery.data() actually go? Can I inspect/locate/list/debug them using a tool?

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• Python 3 - Module: subprocess

  - by Rhys

  Hi Stack Overflow users, I've encountered a frustrating problem, can't find the answer to it. Yesterday I was trying to find a way to HIDE a subprocess.Popen. So for example, if i was opening the cmd. I would like it to be hidden, permanently. I found this code: kwargs = {} if subprocess.mswindows: su = subprocess.STARTUPINFO() su.dwFlags |= subprocess.STARTF_USESHOWWINDOW su.wShowWindow = subprocess.SW_HIDE kwargs['startupinfo'] = su subprocess.Popen("cmd.exe", **kwargs) It worked like a charm! But today, for reasons I don't need to get into, I had to reinstall python 3 (32bit) Now, when I run my program I get this error: Traceback (most recent call last): File "C:\Python31\hello.py", line 7, in <module> su.dwFlags |= subprocess.STARTF_USESHOWWINDOW AttributeError: 'module' object has no attribute 'STARTF_USESHOWWINDOW' I'm using 32bit, python3.1.3 ... just like before. If you have any clues/alternatives PLEASE post, thanks. NOTE: I am looking for a SHORT method to hide the app, not like two pages of code please

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• Do not use IE browser settings when using a proxy with Indy

  - by JD

  Hi At one of our customer sites, we have a Delphi 2007 application that makes a number of HTTPS requests using indy components. All requests are made using the proxy settings the client provides. For this to work, in IE we have to put the URL's in the trusted zones section. After a month due to security settings the trusted zones are cleared. This means we have to re-add the URLs again to make our application work. Is there a way of bypassing IE settings or using a client side HTTP stack so we do not go through the browser to make https requests? JD

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• Want to build simple SQL admin interface to change a few values in a table.

  - by Adam McC

  i am currently building a system in MSSQL 2K5. i have a table that holds information about certain insurance schemes such as overheads and other things. these values will change occasionally and currently i administer the database straight through the management Studio. i would like to build a simple interface that will allow my colleagues to change these values by selecting the company in a dropdown and the current values will populate. they can then edit these values and submit them to the database. is this possible in the current Visual Studio supplied with MSSQL server 2K5 or do i need to get another product. i am confident that with the help of stack overflow and google i can build this myself, but i need pointed in the right direction as to which environment would be easiest and best to start building it. Many thanks, adam

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• What are the reasons to use SQL Server instead of MySQL with a complex .Net project?

  - by cdeszaq

  We currently have a 10 year old nasty, spaghetti-code-style SQL Server database that we are soon looking to pretty much re-write from scratch as part of a re-write to a large web application. (The existing application will serve as the functional requirements for the next incarnation of the app) The new version will be developed in .Net, so a large portion of the application stack will be based on Microsoft technologies (Visual Studio will be used IIS will be the application server). One of the developers on the project has raised the possibility of switching to MySQL instead of SQL Server in order to save on cost for both the licence of the DB server, as well as the tools to design and manipulate the DB (such as the wonderfully free MySQL Workbench). What are the various pros and cons of using SQL Server vs. MySQL as the database for a complex .Net project? Price is one factor we have identified, both in terms of the DB server licence as well as tools to manipulate the DB, but what other factors come into play?

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• Do you know of a bleeding-edge HTML5 leveraging, legacy-ignoring JavaScript framework?

  - by Ivan

  What's the best framework (sort of jquery, extjs, etc like) to use if I'd like to intensively use all the freshest technologies of the HTML5 stack provided by modern browsers (Firefox 3.6+ (Minefield especially), Safari 4+, Chrome 4+) and have absolutely no need to support any legacy browsers (incl. no need in IE support at all, no need in Firefox prior to 3.5, etc.)? I'd like to get all the newest available goodness without having (even abstracted by a library layer) a line of code meant just fore legacy compatibility and keeping no legacy-induced things in mind. To soften the filter, taking very humble hope of such an ideally fresh framework to exist, the least (the maximum level of legacy support) I'd like to agree is not supporting IE versions older than IE8, or better just not supporting IE at all.

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• How can I extend PHP DOMElement?

  - by Michael Tsang

  a.php #!/usr/bin/php <?php class HtmlTable extends DOMElement { public function __construct($height, $width) { parent::__construct("table"); for ($i = 0; $i < $height; ++$i) { $row = $this->appendChild(new DOMElement("tr")); for($j = 0; $j < $width; ++$j) { $row->appendChild(new DOMElement("td")); } } } } $document = new DOMDocument("1.0", "UTF-8"); $document->registerNodeClass("DOMElement", "HtmlTable"); $document->appendChild(new HtmlTable(3, 2)); $document->saveXML(); Running it gets Fatal error: Uncaught exception 'DOMException' with message 'No Modification Allowed Error' in /home/www/a.php:9 Stack trace: #0 /home/www/a.php(9): DOMNode->appendChild(Object(DOMElement)) #1 /home/www/a.php(19): HtmlTable->__construct(3, 2) #2 {main} thrown in /home/www/a.php on line 9

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• Need Magic jQuery Replacement for Selectbox Dropdown Form Element. Thank you!

  - by PlasmaFlux

  Hello! I'm stuck on a problem and, after what seems like days of searching for a solution, I'm reaching out to Stack Overflow for help. I'm trying to replace a standard dropdown form element with a Textbox and a Div containing an unordered list. I'd prefer to have the solution be based on jQuery, but am open to alternatives. I've found a couple jQuery plugins that -almost- do what I need, but are far enough from being a real solution that I need to keep looking. Here's an image of what I'm going for: I'd like the dropdown to look as pictured, and when an element is selected (with mouse or keyboard), have just the first line handed back into the textbox (and not be editable). I'd also like to populate a hidden input field with a value that will be used on Submit. I'm pulling my hair out over this one. Any help and guidance will be most appreciated! Thanks! ~PF

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• How to determine what user and group a Python script is running as?

  - by Chirael

  I have a CGI script that is getting an "IOError: [Errno 13] Permission denied" error in the stack trace in the web server's error log. As part of debugging this problem, I'd like to add a little bit of code to the script to print the user and (especially) group that the script is running as, into the error log (presumably STDERR). I know I can just print the values to sys.stderr, but how do I figure out what user and group the script is running as? (I'm particularly interested in the group, so the $USER environment variable won't help; the CGI script has the setgid bit set so it should be running as group "list" instead of the web server's "www-data" - but I need code to see if that's actually happening.)

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• Is there a Cart/Catalog app out there that isnt a full site?

  - by prodigitalson

  Every solution i come across seems to be a complete store with far too many options and too much functionality. I can write my own cart to get the minimal functionality i need out of the frontend, im just trying to cut out the time writing a complex backend. What im really looking for is something that offers the backend functionality for a product catalog, order management, etc. while providing a smooth and consistent API to access the data for my completely custom frontend application. The frontend will be in PHP so the API would have to be native PHP or some kind of web service interface i can create my own php models around. It would need to run on a LAMP stack and would preferably be written in PHP, Python, or Ruby just in case i need to customize the backend (she curently has ZenCart and hates it - says its far too complicated and sophisticated for her needs). Does such a thing exist? Or what would be the next best thing?

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• Deserialization on client side in Domain Service

  - by ankit

  I have 2 classes: Person and Contact. Person class has a property named ContactNumber which returns the Contact type, and this property is marked as a DataMember for serialization. I have marked Contact type as a DataContract. On the client side I am able to get the values, but when I try to insert a value and then do submit, I get the following exception: Failed to deserialize change-set. Failed to convert value of type 'Dictionary`2' to type 'Contact' Stack Trace is: at System.Web.Ria.DataServiceSubmitRequest.GetChangeSet(DomainService domainService) at System.Web.Ria.DataServiceSubmitRequest.Invoke(DomainService domainService) at System.Web.Ria.DataService.System.Web.IHttpHandler.ProcessRequest(HttpContext context) Can anyone give me the solution ?

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• Debugging kernel hang

  - by l.thee.a

  I am trying to run an app which is using a kernel mode driver. System locks up every hour and the only way to recover it is a hard reset. Sysrq stops responding, telnet sessions hang and there are no error messages of any kind. Unfortunately the board does not have ejtag support. I have been trying to isolate it functionally, but this is like looking for a needle in a hay stack. Any suggestions? PS: This is a mips linux system (2.6.31).

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• How do you pop a modal view and the previous navigation controller view at once?

  - by mr_kurrupt

  I haven't found anything similar to this on google or stack overflow... What I'm trying to do is pop a modal view and the previous view at the same time. For example, look at the calendars app. When you are on the 'Edit' screen and select 'Delete Event', you are taken back to the calendar view. The 'Edit' screen, which was presented modally is popped as well as the the 'Event' screen (where the user is just viewing the calendar event). The problem I am having is that I know how to pop a modal view...but from the same UIViewController subclass ('Edit' screen in this example), how do I pop a view that isn't modal? I was thinking about popping the modal view as you would normally, then posting an NSNotification to the 'Event' (for instance) screen's UIViewController subclass and telling it to pop that view as well. The other thing is that for the animation, it should be the dismissModalViewControllerAnimated animation (slide down) and not the popViewControllerAnimated animation (slide left). Thanks.

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• Preferred Method Of Application Purchase

  - by Chuck

  This is more of a "programmers" question, but felt that it was technical enough to belong on Stack Overflow instead. I'm launching an application soon that will follow the shareware model of purchase. I've thought about implementing this in a few ways: Limited access to the application until they purchase Full access to the application but expires after 30 day, requiring them to purchase to retain utility. Full access to the application indefinitely, but with a 10-15 second pop-up box on start-up asking them to register -- like mIRC does (or used to do). The method of authentication will be web-based. I'll provide them with an authentication key and they'll put it in the application. Whenever the application boots up, it'll check my web service and determine whether the application is genuine or not. This isn't my question. My question is: Is there a preferred method of implementation? I'd like to piss off the users as little as possible, but I'd also like to get paid for my work.

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• I need to display users current location as text

  - by Taylor Satula

  Hi, I am new to iPhone development and really have no idea how to do what I am trying to implement. Here is my problem, I need to display the users current street and city as text in my iPhone app (See picture). I have seen many posts on stack overflow and other websites about how to do this but they are all just code examples. As I said before, I am a extreme beginner. I just need to show the MKReverseGeocoder and its output as text in my application. If someone could walk me through how/where to create the ReverseGeocoder and how to make it show up in my application I would be extremely grateful. I have searched for hours trying to find a beginner example but alas I cannot find one that lays it out step by step. I hope this can help me out.

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• format specifier for short integer

  - by cateof

  I don't use correctly the format specifiers in C. A few lines of code: int main() { char dest[]="stack"; unsigned short val = 500; char c = 'a'; char* final = (char*) malloc(strlen(dest) + 6); snprintf(final, strlen(dest)+6, "%c%c%hd%c%c%s", c, c, val, c, c, dest); printf("%s\n", final); return 0; } I want my executable to print aa500aastack and not aa500aasta Why I am loosing 2 byte? What is the correct format specifier for an unsighed short integer? thanks.

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• At what point should I change the way Struts acquires the session token?

  - by Hanno Fietz

  It seems I have to find a different way to transmit the session token from a Flex client to a Struts backend without using cookies. If I were to put the session token in the payload of a request, at what point would I have to customize Struts' behaviour so that I can reuse as much of the existing session handling as possible? In particular, I don't want to reimplement whatever security measures (such as tying a token to an IP) and configuration parameters (such as session expiration interval). There's a CreateSession interceptor, rather early in the default stack, should I swap that with a subclassed version?

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• Duplicate an AppEngine Query object to create variations of a filter without affecting the base quer

  - by Steve Mayne

  In my AppEngine project I have a need to use a certain filter as a base then apply various different extra filters to the end, retrieving the different result sets separately. e.g.: base_query = MyModel.all().filter('mainfilter', 123) Then I need to use the results of various sub queries separately: subquery1 = basequery.filter('subfilter1', 'xyz') #Do something with subquery1 results here subquery2 = basequery.filter('subfilter2', 'abc') #Do something with subquery2 results here Unfortunately 'filter()' affects the state of the basequery Query instance, rather than just returning a modified version. Is there any way to duplicate the Query object and use it as a base? Is there perhaps a standard Python way of duping an object that could be used? The extra filters are actually applied by the results of different forms dynamically within a wizard, and they use the 'running total' of the query in their branch to assess whether to ask further questions. Obviously I could pass around a rudimentary stack of filter criteria, but I'd rather use the Query itself if possible, as it adds simplicity and elegance to the solution.

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