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• Do you have any tips for comments to keep them in step with the code? [closed]

  - by Rob Wells

  Possible Duplicate: How do you like your comments? G'day, I've read both of Steve McConnell's excellent Code Complete books "Code Complete" and "Code Complete 2" and was wondering if people have any other suggestions for commenting code. My commenting mantra could be summed up by the basic idea of expressing "what the code below cannot say". While enjoying this interesting blog post by Jeff about commenting I was still left wondering "When coding, when do you feel a comment is required?" Edit: Oops. Seems to be a duplicate of this question http://stackoverflow.com/questions/121945/how-do-you-like-your-comments so sorry for the noise. Thanks to my, seemingly, SO shadow for pointing it out - wouldn't have thought I was that interesting. Now off to read the original post and see if it is relevant. Edit: I meant to emphasise the best appraoch to ensure that your comments will stay in step with the code. Maybe expressing an intent rather than the mechansim for instance.

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• Different formats of OpenIDs

  - by mecablaze

  stackoverflow, I am experimenting with implementing OpenID in my existing site. I have looked at Plaxo's article on this very subject and I'm a mite confused about something. I am using this PHP OpenID library. I have some code running, and I am getting a unique OpenID back. From myopenid.com, I am getting an id that looks like https://mecablaze.myopenid.com/ But from Yahoo and Google, I am getting an ID that much more cryptic, e.g. https://www.google.com/accounts/o8/id?id=AItOawlbp1cxujdJWDnpx72xVROOw-5V_WzIDZA Are Google's and Yahoo's "gibberish" ids unique for every login user, i.e. is this the value that I use to tie in with existing user on my web app?

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• Using multithreading for loop

  - by annelie

  Hello, I'm new to threading and want to do something similar to this question: http://stackoverflow.com/questions/100291/speed-up-loop-using-multithreading-in-c-question However, I'm not sure if that solution is the best one for me as I want them to keep running and never finish. (I'm also using .net 3.5 rather than 2.0 as for that question.) I want to do something like this: foreach (Agent agent in AgentList) { // I want to start a new thread for each of these agent.DoProcessLoop(); } --- public void DoProcessLoop() { while (true) { // do the processing // this is things like check folder for new files, update database // if new files found } } Would a ThreadPool be the best solution or is there something that suits this better? Thanks, Annelie

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• Websites with horizontal sliding panels

  - by peterdp

  In a recent meeting, I mentioned that I've seen a few websites with horizontal sliding panels and thought the UI was elegant, uncluttered and accessible. Naturally, I was asked to provide examples of those sites, but can't seem to dig up any of them now. Actually, I've been looking on an off for the past few days. (blush) Sooo.... I thought that I would put it out to the brilliant and talented folks who frequent StackOverflow. If you know of a website -- or better yet, have a website -- that uses horizontal sliding panels to provide rich functionality while maintaining a clean UI, would you please take a few moments and paste links here? I'm sure it would be helpful to a bunch o' folks. Thanks so very much!

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• How do I design a cryptographic hash function?

  - by Eyal

  After reading the following about why one-way hash functions are one-way, I would like to know how to design a hash function. http://stackoverflow.com/questions/1038307/help-me-better-understand-cryptographic-hash-functions/1047106#1047106 Before everyone gets on my case: Yes, I know that it's a bad idea to not use a proven and tested hash function. I would still like to know how it's done. I'm familiar with Feistel-network ciphers but those are necessarily reversible, horrible for a cryptographic hash. Is there some sort of construction that is well-used in cryptographic hashing? Something that makes it very one-way?

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• JPanel on top of JLabel

  - by newbie

  Good day! Is it possible to add a JPanel on top of a JLabel? I would like my JFrame to have a background image and in order to this, i used this code (based from past stackoverflow answers): setLocation(150,50); setSize(700,650); setVisible(true); JLabel contentPane = new JLabel(); contentPane.setIcon(new ImageIcon("pics/b1.jpg")); contentPane.setLayout( new BorderLayout()); setContentPane( contentPane ); Now my problem is, I cannot put a panel on my JFrame because of the JLabel background. Please help. Thanks.

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• Managing EntityConnection lifetime

  - by kervin

  There have been many question on managing EntityContext lifetime, e.g. http://stackoverflow.com/questions/813457/instantiating-a-context-in-linq-to-entities I've come to the conclusion that the entity context should be considered a unit-of-work and therefore not reused. Great. But while doing some research for speeding up my database access, I ran into this blog post... Improving Entity Framework Performance The post argues that EFs poor performance compared to other frameworks is often due to the EntityConnection object being created each time a new EntityContext object is needed. To test this I manually created a static EntityConnection in Global.asax.cs Application_Start(). I then converted all my context using statements to using( MyObjContext currContext = new MyObjeContext(globalStaticEFConnection) { .... } This seems to have sped things up a bit without any errors so far as far as I can tell. But is this safe? Does using a applicationwide static EntityConnection introduce race conditions? Best regards, Kervin

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• Need a .NET Dictionary<string,object> with just a little more functionality.

  - by Ronnie Overby

  I need a dictionary but I also need to store a boolean value about the object in the dictionary. What's the best way for this. Something like Dictonary<string,object,bool> would be ideal, but doesn't exist. My first idea was: public class SomeObject { public object Value { get; set; } public bool Flag { get; set; } } // and then use: Dictionary<string,SomeObject> myDictionary; My 2nd idea was to implement IDictionary and contain two dictionaries within that were manipulated by the implemented methods and property accessors. My 3rd idea was to see what the folks at StackOverflow would do.

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• Variable declarations following if statements

  - by Anthony Pegram

  An issue came up on another forum and I knew how to fix it, but it revealed a feature of the compiler peculiar to me. The person was getting the error "Embedded statement cannot be a declaration or labeled statement" because they had a declaration of a variable following an if statement with no brackets. That was not their intent, but they had commented out the line of code immediately following the if statement, which made the variable declaration the de facto line of code to execute. Anyway, that's the background, which brings me to this. The following code is illegal if (true) int i = 7; However, if you wrap that in brackets, it's all legal. if (true) { int i - 7; } Neither piece of code is useful. Yet the second one is OK. What specifically is the explanation for this behavior? I have a hypothesis, but I'd rather ask the brilliant people on stackoverflow.

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• How do you sort files numerically?

  - by Zachary Young

  Hello all, First off, I'm posting this because when I was looking for a solution to the problem below, I could not find one on stackoverflow. So, I'm hoping to add a little bit to the knowledge base here. I need to process some files in a directory and need the files to be sorted numerically. I found some examples on sorting--specifically with using the lamba pattern--at wiki.python.org, and I put this together: #!env/python import re tiffFiles = """ayurveda_1.tif ayurveda_11.tif ayurveda_13.tif ayurveda_2.tif ayurveda_20.tif ayurveda_22.tif""".split('\n') numPattern = re.compile('_(\d{1,2})\.', re.IGNORECASE) tiffFiles.sort(cmp, key=lambda tFile: int(numPattern.search(tFile).group(1))) print tiffFiles I'm still rather new to Python and would like to ask the community if there are any improvements that can be made to this: shortening the code up (removing lambda), performance, style/readability? Thank you, Zachary

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• Drag-and-drop file upload in Chromium?

  - by Zarel

  Drag-and-drop file uploading can be done in Firefox 3.6 by using FileReader: http://stackoverflow.com/questions/2121018/native-drag-drop-file-upload-in-firefox-3-6 However, Google recently released an update for Gmail that allowed drag-and-drop file uploading in Chromium as well as Firefox, and Chromium does not have FileReader. I'm using the latest Chromium nightly, and it can drag-drop upload files, while not supporting FileReader. I've seen someone mention that drag-drop uploading can be possible by dragging onto an <input type="file" />, but that can only support one file at a time, while Gmail's uploader can handle multiple files being dragged onto it, so that's clearly not what they're doing. So the question is, how do they do it? How do you support Chromium for HTML5 file uploading?

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• Print a bitmap without printing a sprite?

  - by Carlos Barbosa

  Following up from: http://stackoverflow.com/questions/3021557/as3-printing-problem-blanks-swf-after-print-or-cancel I am trying to comeup with a function to print without creating a sprite, because that's what it seems to be causing my problem: public function printScreen():void { var pJob:PrintJob = new PrintJob(); var options:PrintJobOptions = new PrintJobOptions(); options.printAsBitmap = true; var bitmapData:BitmapData = new BitmapData(root.width, root.height); bitmapData.draw(root); var printThis:Bitmap = new Bitmap(bitmapData); try { pJob.start(); pJob.addPage(printThis, null, options); pJob.send(); } catch(e:Error) { trace("Error Printing") } } This is coming up with an: Error: Description Implicit coercion of a value of type flash.display:Bitmap to an unrelated type flash.display:Sprite. So how do you print a bitmap without creating a Sprite?

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• How do I use a command line tool to install .net 4 to IIS

  - by tehp

  I'm trying to deploy my WCF RIA services application to our in-house server for testing. I've been following the instructions and comments from this blog site: http://timheuer.com/blog/archive/2009/12/10/tips-to-deploy-ria-services-troubleshoot.aspx At the end someone points to this question: http://stackoverflow.com/questions/1528324/how-to-solve-a-http-error-404-3-not-found-error I've been trying to run that same tool with .net 4.0 but it keeps giving me an error: [Warning]The HTTP namespace reservation already exists. I am running the version of the exe that I found inside of C:\Windows\Microsoft.NET\Framework\v4.0.21006 There is also C:\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation that has (what I assume is) the same exe in it, and I can use it just fine. I've tried to un-install the 3.0 version before installing the 4.0 version, but I am still getting the same warning and failure. Has anyone successfully done this with .net 4.0?

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• Code computing the cross-product

  - by WizardOfOdds

  This is not a dupe of my question: http://stackoverflow.com/questions/2532810/detecting-one-points-location-compared-to-two-other-points If I have the following piece of pseudo-C/Java/C# code: int a[]= { 30, 20 }; int b[] = { 40, 50 }; int c[] = {12, 12}; How do I compute the sign of the cross-product ABxAC? I'm only interested in the sign, so I have: boolean signABxAC = ? Now concretely what do I write to get the sign of the cross-product ABxAC?

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• Please suggest some alternative to Drupal

  - by abovesun

  Drupal propose completely different approach in web development (comparing with RoR like frameworks) and it is extremely good from development speed perspective. For example, it is quite easy to clone 90% of stackoverflow functionality using Drupal. But it has several big drawbacks: it is f''cking slow (100-400 requests per page) db structure very complicated, need at least 2 tables for easy content (entity) type, CCK fields very easy generate tons of new db tables anti-object oriented, rather aspect-oriented bad "view" layer implementation, no strange forward layouts and so on. After all this items I can say I like Drupal, but I would like something same, but more elegant and more object oriented. Probably something like http://drupy.net/ - drupal emulation on the top of django. P.S. I wrote this question not for new holy word flame, just write if you know alternative that uses something similar approach.

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• How do you keep yourself and your co-workers from creating huge classes

  - by PieterG

  Stackoverflow users, How do you keep yourself from creating large classes with large bodied methods. When deadlines are tight, you end up trying to hack things together and it ends up being a mess which would need to be refactored. For me, the one way was to start with test driven development and that lends itself to good class design as well as the SRP (Single Responsibility Principle). I also see developers just double clicking on controls and typing out line after line in the event method that gets fired. What are your suggestions?

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• Detecting if Excel file has been closed

  - by Charlie

  Hi StackOverflow, I've spent the past 3 hours trawling the web for answers to no avail, so I hope you can help me. I'm writing an application which automates Excel. The application has an option to "show/hide the excel sheet" so you can look at it, make any final changes and so forth. Closing the application will naturally close the instance of Excel, however, there is a small chance that someone may exit out of Excel directly, without thinking. This breaks my application and I can't seem to find anyway of "checking if the same workbook is still open, and if not, re-opening it", before saving it I've tried all sorts of things: checking if the Excel Application is null (when it's !=null it will save correctly, but when it "is" null (or at least, something other than !=null it won't even hit the breakpoint so I'm completely lost :( Help please?

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• rails: date type and GetDate

  - by cbrulak

  This is a follow up to this question: http://stackoverflow.com/questions/2930256/unique-responses-rails-gem I'm going to create an index based on the user id, url and a date type. I want date type (not datetime type) because I want the day, the 24 hour day to be part of the index to avoid duplication of page views counts on the same day. In other words: A view only counts once in a day by a visitor. I also want the default value of that column (viewdate) to be the function GETDATE(). This is what I have in my migration: execute "ALTER TABLEpage_viewsADD COLUMN viewdate datetime DEFAULTGETDATE()`" But the value viewdate is always empty. What am I missing? (as an aside, any other suggestions for accomplishing this goal?)

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• Python Profiling in Eclipse

  - by Jordan L. Walbesser

  This questions is semi-based of this one here: http://stackoverflow.com/questions/582336/how-can-you-profile-a-python-script I thought that this would be a great idea to run on some of my programs. Although profiling from a batch file as explained in the aforementioned answer is possible, I think it would be even better to have this option in Eclipse. At the same time, making my entire program a function and profiling it would mean I have to alter the source code? How can I configure eclipse such that I have the ability to run the profile command on my existing programs? Any tips or suggestions are welcomed!

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• Writing an http sniffer (or any other application level sniffer)

  - by Ishi

  Dear all, I am trying my hands understanding PCAP libraries. I am able to apply a filter and get the TCP payload at port 80. But what next ? How can I read the HTTP data - suppose I want to know the "User Agent" field value in the http header..how should I proceed ? I have searched the website (and googled a lot too), and could find a related thread here : http://stackoverflow.com/questions/2073183/writing-a-http-sniffer. But this doesn't help me anywhere... Thanks !!

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• Customizing the behavior of ControlDesigners for Controls derived from native .NET controls.

  - by Eric

  My question is related to this question: http://stackoverflow.com/questions/93541/baseline-snaplines-in-custom-winforms-controls However, in my case, I have created a new control that derives from TextBox rather than containing a TextBox. I would like to have a custom ControlDesigner, but I would like to modify the behavior of the TextBox's designer rather than having to write a complete designer myself. In particular, I'd like to be able to return the TextBox's SnapLines while providing some custom verbs. Is there a good way to do this? EDIT: To clarify, this is for Windows Forms in .NET 2.0.

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• Examining mmaped addresses using GDB

  - by Mikeage

  I'm using the driver I posted at http://stackoverflow.com/questions/647783/direct-memory-access-in-linux/ to mmap some physical ram into a userspace address. However, I can't use GDB to look at any of the address; i.e., x 0x12345678 (where 0x12345678 is the return value of mmap) fails with an error "Cannot access memory at address 0x12345678". Is there any way to tell GDB that this memory can be viewed? Alternatively, is there something different I can do in the mmap (either the call or the implementation of foo_mmap there) that will allow it to access this memory? Note that I'm not asking about /dev/mem (as in the first snippet there) but amount a mmap to memory acquired via ioremap(), virt_to_phys() and remap_pfn_range()

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• posmax: like argmax but gives the position(s) of the element x for which f[x] is maximal

  - by dreeves

  Mathematica has a built-in function ArgMax for functions over infinite domains, based on the standard mathematical definition. The analog for finite domains is a handy utility function. Given a function and a list (call it the domain of the function), return the element(s) of the list that maximize the function. Here's an example of finite argmax in action: http://stackoverflow.com/questions/471029/canonicalize-nfl-team-names/472213#472213 And here's my implementation of it (along with argmin for good measure): (* argmax[f, domain] returns the element of domain for which f of that element is maximal -- breaks ties in favor of first occurrence. *) SetAttributes[{argmax, argmin}, HoldFirst]; argmax[f_, dom_List] := Fold[If[f[#1]>=f[#2], #1, #2]&, First[dom], Rest[dom]] argmin[f_, dom_List] := argmax[-f[#]&, dom] First, is that the most efficient way to implement argmax? What if you want the list of all maximal elements instead of just the first one? Second, how about the related function posmax that, instead of returning the maximal element(s), returns the position(s) of the maximal elements?

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• Get all folder / directories list in VB.net

  - by Henry

  Hi, this is my first Stackoverflow question, im learning VB and having a few problems with getting a list of all folders/directories on the system, im using the code included here and it seems to work until it hits the recycle bin folder, and some other system folders Sub main() Dim DirList As New ArrayList GetDirectories("c:\", DirList) For Each item In DirList 'add item to listbox or text etc here Next End sub End Sub Sub GetDirectories(ByVal StartPath As String, ByRef DirectoryList As ArrayList) Dim Dirs() As String = Directory.GetDirectories(StartPath) DirectoryList.AddRange(Dirs) For Each Dir As String In Dirs GetDirectories(Dir, DirectoryList) Next End Sub Can anyone help me with this, id like to know what is causing this first, and a good fix, or alternative way to do this. Thanks in advance.

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• Geocode multiple addresses

  - by ace2600

  I need to geocode around 200 addresses per request and do around 3,000 request per day. I will be doing this server side using PHP. I have looked at http://stackoverflow.com/questions/98449/how-to-convert-an-address-to-a-latlon, but could not find a way for either Google Maps HTTP Request API or the Yahoo Geocoding REST API (cannot use JavaScript as this is server side) to send multiple addresses. I will be primarily using this to sort addresses based on the coordinates and if the API supports, fill in any missing data for each address. The addresses will be in the United States only. The addresses to geocode will be from user input, so be free form, like "street address, postal code", or "city, state", etc. Accuracy is not too important for the coordinates, say within five hundred feet or so. Is there a free API to handle this? Is there a way to get Yahoo or Google to do multiple locations in a request?

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