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• How do I assign selected WPF datagrid row columns to variables. (VB.NET)

  - by Peter

  Hi, I have a datagrid with customer data such as ID, name, email, phone etc. When I select a row (with a button or selectionchanged) I want to store that row's columns in variables like dim email as string dim name as string email = dgCustomers.theselectedrow.theselectedcell name = dgCustomers.theselectedrow.theselectedcell If I have a datatable with only one row I know I can get column data with: dim email as string = CustomerDataTableInstance.rows(0).Item("Email") I don't know how to get the selected row number though when I have several rows and the user clicks one/uses the keyboard. The datagrid is bound to a datatable, not a class with object collections. Any help is appreciated!

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• Google app engine and paging

  - by klausbyskov

  How would one go about writing a query that selects items 2000-2010 out of a collection of 10000 objects in the data store. I know that it can be done like this in GQL: select * from MyObject limit 10 offset 2000 According to the documentation, when using an offset the engine will still fetch all the rows, only not return them, thus making the query perform in a way that corresponds linearly with the value of offset. Is there any better way? Such as using a pseudo ROWNUM column like one could do in other types of data stores.

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• Efficient way to ASCII encode UTF-8

  - by Andreas Gohr

  I'm looking for a simple and efficient way to store UTF-8 strings in ASCII-7. With efficient I mean the following: all ASCII chars in the input should stay ASCII chars in the output the resulting string should be as short as possible the operation needs to be reversable without any data loss there should be no restriction on the input length the whole UTF-8 range should be allowed My first idea was to use Punycode (IDNA) as it fits the first three requirements, but it fails at the last two. Can anyone recommend an alternative encoding scheme? Even better if there's some code available to look at.

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• Image bit depth values.

  - by pencilslate

  REPHRASED QUESTION: I am coming up with a list of possible image bit depth values that could be used as a predefined reference list in my application. I could think of 8,16,24 and 32 bit depths. The image formats considered are BMP, JPEG, PNG and GIF. I understand the bit depth decides the quality and thereby the storage requirements for the image. The application is used to store user uploaded images(non-medical, non-DICOM). Are there more bit depths other than the ones mentioned above that i should be including in my list? Are there any stats on the usage of the images with bit depths? Appreciate your response!

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• Why Does Piping Binary Text to the Screen often Horck a Terminal

  - by Alan Storm

  Imaginary Situation: You’ve used mysqldump to create a backup of a mysql database. This database has columns that are blobs. That means your “text” dump files contains both strings and binary data (binary data stored as strings?) If you cat this file to the screen $ cat dump.mysql you’ll often get unexpected results. The terminal will start beeping, and then the output finishes scrolling by you’ll often have garbage chacters entered on your terminal as through you’d typed them, and sometimes your prompts and anything you type will be garbage characters. Why does this happen? Put another way, I think I’m looking for an overview of what’s actually happening when you store binary strings into a file, and when you cat those files, and when the results of the cat are reported to the terminal, and any other steps I’m missing.

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• Use ASP.NET Profile or not?

  - by DotnetDude

  I need to store a few attributes of an authenticated user (I am using Membership API) and I need to make a choice between using Profiles or adding a new table with UserId as the PK. It appears that using Profiles is quick and needs less work upfront. However, I see the following downsides: The profile values are squished into a single ntext column. At some point in the future, I will have SQL scripts that may update user's attributes. Querying a ntext column and trying to update a value sounds a little buggy to me. If I choose to add a new user specific property and would like to assign a default for all the existing users, would it be possible? My first impression has been that using profiles may cause maintainance headaches in the long run. Thoughts?

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• "The item you tried to buy is no longer available" storekit error in iphone sdk

  - by aloo

  Hi all, I'm trying to use the StoreKit API in OS3.0 for the iphone to do in app purchase. However, I'm getting the following error when trying to purchase something in the SANDBOX ENVIRONMENT. The item you tried to buy is no longer available [Environment: Sandbox] Here's the code I use to do the payments: SKPayment* payment = [SKPayment paymentWithProductIdentifier:model.productId]; [[SKPaymentQueue defaultQueue] addPayment:payment]; I've also queried storekit for the list of available products and that seems to work just fine returning the same product identifiers that I'm now using to purchase the item. I have all the products setup in iTunes Connect and created a test user. Before debugging the app I signed out of the store in the settings menu and entered my test account and password when debugging my own app. What could be going on here?

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• What is the "Dispatcher" design pattern?

  - by Ben Farmer

  What is the "dispatcher" pattern and how would I implement it in code? I have a property bag of generic objects and would like to have the retrieval delegated to a generic method. Currently, I have properties looking for a specific key in the bag. For example: private Dictionary<String, Object> Foo { get; set; } private const String WidgetKey = "WIDGETKEY"; public Widget? WidgetItem { get { return Foo.ContainsKey(WidgetKey) ? Foo[WidgetKey] as Widget: null; } set { if (Foo.ContainsKey(WidgetKey)) Foo[WidgetKey] = value; else Foo.Add(WidgetKey, value); } } It was suggested that this could be more generic with the "dispatcher" pattern, but I've been unable to find a good description or example. I'm looking for a more generic way to handle the property bag store/retrieve.

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• Making change recursively: How do I modify my algorithm to print all combinations?

  - by cb

  I have an algorithm that recursively makes change in the following manner: public static int makeChange(int amount, int currentCoin) { //if amount = zero, we are at the bottom of a successful recursion if (amount == 0){ //return 1 to add this successful solution return 1; //check to see if we went too far }else if(amount < 0){ //don't count this try if we went too far return 0; //if we have exhausted our list of coin values }else if(currentCoin < 0){ return 0; }else{ int firstWay = makeChange(amount, currentCoin-1); int secondWay = makeChange(amount - availableCoins[currentCoin], currentCoin); return firstWay + secondWay; } } However, I'd like to add the capability to store or print each combination as they successfully return. I'm having a bit of a hard time wrapping my head around how to do this. The original algorithm was pretty easy, but now I am frustrated. Any suggestions? CB

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• Search a variable for an address

  - by chrissygormley

  Hello, I am trying to match information stored in a variable. I have a list of uuid's and ip addresses beside them. The code I have is: r = re.compile(r'urn:uuid:5EEF382F-JSQ9-3c45-D5E0-K15X8M8K76') m = r.match(str(serv)) if m1: print'Found' The string serv contains is: urn:uuid:7FDS890A-KD9E-3h53-G7E8-BHJSD6789D:[u'http://10.10.10.20:12365/7FDS890A-KD9E-3h53-G7E8-BHJSD6789D/'] --------------------------------------------- urn:uuid:5EEF382F-JSQ9-3c45-D5E0-K15X8M8K76:[u'http://10.10.10.10:42365'] --------------------------------------------- urn:uuid:8DSGF89S-FS90-5c87-K3DF-SDFU890US9:[u'http://10.10.10.40:5234'] --------------------------------------------- So basically I am wanting to find the uuid string and find out what it's address is and store it as a variable. So far I have just tried to get it to match the string to no avail. Can anyone point out a solution to this. Thanks

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• Maintaining session across relay domain?

  - by Steffen

  I'm building a payment page in asp.net, however the page where you order your items is run in HTTP (non-secure) on my domain. When redirecting the user to the payment site, I have to go through a different domain (my payment provider, from whom I borrow the SSL certificate), so my payment url ends up like https://www.paymentprovider.com/somescript.cgi/www.mydomain.com/mypaymentpage.aspx Now the problem is my session is lost, but I store the order in session, so I desperately needs it. Can I somehow send the SessionID in querystring, and restore the session from it - or do I need to stuff the entire order into querystring ? (Not too certain it'll fit though, it's rather long) Any help will be highly appreciated :-)

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• Super Cam iphone app how do they make it possible?

  - by Silent

  there is an iphone app called supercam and you can get it through the app store free. This app features a way to connect your webcam or dv cam that is connected on the internet, you could set up the ip address and enter the data on the app and it will connect to your online camera. the thing is that they have the video stream and it looks like they embedded the video in a uiview or webview at the bottom they have buttons to choose from all the cameras you have set up. so this is different from other video streaming apps because it does not play the video from the full screen mode (MPMediaPlayer API) would there be any tutorials about this or somehow take reverse engineer this?

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• Windows Azure Table Storage LINQ Operators

  - by Ryan Elkins

  Currently Table Storage supports From, Where, Take, and First. Are there plans to support any of the other 29 operators? If we have to code for these ourselves, how much of a performance difference are we looking at to something similar via SQL and SQL Server? Do you see it being somewhat comparable or will it be far far slower if I need to do a Count or Sum or Group By over a gigantic dataset? I like the Azure platform and the idea of cloud based storage. I like Windows Azure for the amount of data it can store and the schema-less nature of table storage. SQL Azure just won't work due to the high cost to storage space.

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• schema for storing different varchar fields over time?

  - by Henry

  This app I'm working on needs to store some meta data fields about an entity. The problem is that we can already foresee that these fields are going to change a lot in the future. I'm using Hibernate (in ColdFusion) and each entity's properties are translated to one column in the entity table, but altering table columns later down the raod will be costly and error-prone right? Should I go for something like this? MetaDataField ----- metaDataFieldID (PK), name FieldValue ---------- EntityID (PK, FK), metaDataFieldID (PK, FK), value [varchar(255)] Is this common? Anything to watch out for? p.s. I also thought of using XML on SQL Server 05+. After talking to some ppl, seems like it is not a viable solution 'cause it will be too slow for doing certain query for reporting purposes.

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• How to save, retrieve and draw an image in webapplication using Java and PostgreSQL?

  - by spderosso

  Given an object X; I want this object to have an image. The image must be stored in the database. I can't store the path, the actual image must be in the database. My question can be answered by answering the following subquestions: a). What type of field should I put in the database? (e.g VARCHAR) b) What type of object should I use for storing and manipulating the image (at an object layer)? (e.g java.awt.Image) c) How do I create an object of the type selected (answer of question b) from the data obtained from the database? d) How do I save an object of the type selected (answer of question b) to the database? e) How do I draw the image on a web page? I am using PostgreSQL, Java and it is a web application. Thanks!

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• Retreive value from model into view ib MVC 3

  - by prerna

  public class HomeController : Controller { public ActionResult Index() { return View(); } /* public string Browse() { return "Hello from Browse"; public string Details(int id) { string message = "Store.Details, ID = " + id; return message; // return "Hello from Details"; }*/ public ActionResult Details(int id) { var album = new Album { Title = "Album " + id }; return View(album); } } I am new to MVC 3 ,My View is Details.aspx without Razor engine. <html> <head runat="server"> <title>Details</title> </head> <body> <div> </div> </body> </html> Can anyone help

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• Avoiding dispose of underlying stream

  - by danbystrom

  I'm attempting to mock some file operations. In the "real" object I have: StreamWriter createFile( string name ) { return new StreamWriter( Path.Combine( _outFolder, name ), false, Encoding.UTF8 ) ); } In the mock object I'd like to have: StreamWriter createFile( string name ) { var ms = new MemoryStream(); _files.Add( Path.Combine( _outFolder, name ), ms ); return new StreamWriter( ms, Encoding.UTF8 ) ); } where _files is a dictionary to store created files for later inspection. However, when the consumer closes the StreamWriter, it also disposes the MeamoryStream... :-( Any thoughts on how to pursue this?

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• ASP.NET MVC pass information from controller to view WITHOUT ViewData, ViewModel, or Session

  - by josh

  I have a unique scenario where I want a base controller to grab some data and store it in a list. The list should be accessible from my views just as ViewData is. I will be using this list on every page and would like a cleaner solution than just shoving it in the ViewDataDictionary. After attempting to come up with a solution, I thought I would create a custom ViewPage with a property to hold my list. My custom ViewPage would inherit from System.Web.MVC.ViewPage. However, I do not know where MVC passes the viewdata from the controller off to the view. More importantly, how do I get it to pass my list down to the view? Thanks for the help.

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• Recommendations for an in memory database vs thread safe data structures

  - by yx

  TLDR: What are the pros/cons of using an in-memory database vs locks and concurrent data structures? I am currently working on an application that has many (possibly remote) displays that collect live data from multiple data sources and renders them on screen in real time. One of the other developers have suggested the use of an in memory database instead of doing it the standard way our other systems behaves, which is to use concurrent hashmaps, queues, arrays, and other objects to store the graphical objects and handling them safely with locks if necessary. His argument is that the DB will lessen the need to worry about concurrency since it will handle read/write locks automatically, and also the DB will offer an easier way to structure the data into as many tables as we need instead of having create hashmaps of hashmaps of lists, etc and keeping track of it all. I do not have much DB experience myself so I am asking fellow SO users what experiences they have had and what are the pros & cons of inserting the DB into the system?

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• Error while storing to a shared network drive when running website on IIS

  - by vini

  System.UnauthorizedAccessException: Access to the path '\\192.168.0.99\c$\DTA\DTA564348.64U20121217161754.dta' is denied. When i store the file by running on my local asp.net website it works fine and gets stored on the shared network drive However when i run this through IIS i get the above error C# Code StrPath = FilePhypath.ToString(); Web.Config <location allowOverride="true"> <appSettings> <add key="FilephyPath" value="\\192.168.0.99\c$\DTA\"/> </appSettings> </location>

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• social networking website database management

  - by Anup Prakash

  This could be very basic type of question for you! But for me it is very important. 1) How these(orkut, facebook or other) website store the images in server? Options: a) Keeping all the images in database by converting into bytecode/binary. b) Making a new folder for each user and saving photographs according to their library name. c) Or something else which i(Anup) didn't guess yet. Please reply me. Sayiing thanx to see my question and any many many thanx for answering my question.

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• in app purchases question

  - by bdt

  I am looking into the iPhone in app purchased models and need to implement a subscription. Ex content will be available for 24 hours. Now the most important thing is that it needs to be available on all the other devices, so bought on the iPhone, viewable on the iPad. I'm not sure how this works ? I need to store some information on the developer server but is this the transaction id and current date/time so when launching the app on the iPad, you will attempt to buy the content again. Apple will see that this user already bought that and hopefully returns the transaction ID. At that moment I can verify if the time limit it still valid or not. Can anyone confirm this method off working? If this is correct is there a 'renew'?

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• Good way to format decimal in SQL Server

  - by Brad

  We store a decimal(9,8) in our database. It can have any number of places after the decimal point (well, no more than 8). I am frustrated because I want to display it as human-readable text as part of a larger string created on the server. I want as many decimals to the right of the decimal point as are non-zero, for example: 0.05 0.12345 3.14159265 Are all good If I do CAST(d AS varchar(50)) I get formatting like: 0.05000000 0.12345000 3.14159265 I get similar output if I cast/convert to a float or other type before casting to a varchar. I know how to do a fixed number of decimal places, such as: 0.050 0.123 3.142 But that is not what I want. Yes, I know I can do this through complicated string manipulation (REPLACE, etc), there should be a good way to do it.

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• Is there a practical alternative to struct inheritance? (C#)

  - by Tim Coulter

  I am writing code that will populate the Margin, Padding and BorderThickness properties of classes in the System.Windows.Documents namespace. Each of these properties accepts a value in the form of a System.Windows.Thickness, which is a struct. However, I wish to associate some additional data with each of these property assignments, which may subsequently be retrieved by my code. If Thickness were a class, I would inherit from it and define properties in the subclass to store my additional data items. But since it is a struct, inheritance is not possible. Is there any practical way to achieve this, while maintaining type-compatibility with the properties I am populating? Thanks for your ideas, Tim

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• Password reset by email without a database table

  - by jpatokal

  The normal flow for resetting a user's password by mail is this: Generate a random string and store it in a database table Email string to user User clicks on link containing string String is validated against database; if it matches, user's pw is reset However, maintaining a table and expiring old strings etc seems like a bit of an unnecessary hassle. Are there any obvious flaws in this alternative approach? Generate a MD5 hash of the user's existing password Email hash string to user User clicks on link containing string String is validated by hashing existing pw again; if it matches, user's pw is reset Note that the user's password is already stored in a hashed and salted form, and I'm just hashing it once more to get a unique but repeatable string. And yes, there is one obvious "flaw": the reset link thus generated will not expire until the user changes their password (clicks the link). I don't really see why this would be a problem though -- if the mailbox is compromised, the user is screwed anyway.

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