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  • lambda expressions in C#?

    - by Matt
    Hey I'm rather new to these could someone explain the significance (of the following code) or prehaps give a link to some useful information on lambda expressions? I encounter the following code in a test and I am wondering why someone would do this: foo.MyEvent += (o, e) => { fCount++; Console.WriteLine(fCount); }; foo.MyEvent -= (o, e) => { fCount++; Console.WriteLine(fCount); }; My instinct tells me it is something simple and not a mistake, but I don't know enough about these expressions to understand why this is being done. Regards,

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  • .NET Oracle Provider: Why will my stored proc not work?

    - by Matt
    I am using the Oracle .NET Provider and am calling a stored procedure in a package. The message I get back is "Wrong number or types in call". I have ensured that the order in which the parameters are being added are in the correct order and I have gone over the OracleDbType's thoroughly though I suspect that is where my problem is. Here is the code-behind: //setup intial stuff, connection and command string msg = string.Empty; string oraConnString = ConfigurationManager.ConnectionStrings["OracleServer"].ConnectionString; OracleConnection oraConn = new OracleConnection(oraConnString); OracleCommand oraCmd = new OracleCommand("PK_MOVEMENT.INSERT_REC", oraConn); oraCmd.CommandType = CommandType.StoredProcedure; try { //iterate the array //grab 3 items at a time and do db insert, continue until all items are gone. Will always be divisible by 3. for (int i = 0; i < theData.Length; i += 3) { //3 items hardcoded for now string millCenter = "0010260510"; string movementType = "RECEIPT"; string feedCode = null; string userID = "GRIMMETTM"; string inventoryType = "INGREDIENT"; //set to FINISHED for feed stuff string movementDate = theData[i + 0]; string ingCode = System.Text.RegularExpressions.Regex.Match(theData[i + 1], @"^([0-9]*)").ToString(); string pounds = theData[i + 2].Replace(",", ""); //setup parameters OracleParameter p1 = new OracleParameter("A_MILL_CENTER", OracleDbType.NVarchar2, 10); p1.Direction = ParameterDirection.Input; p1.Value = millCenter; oraCmd.Parameters.Add(p1); OracleParameter p2 = new OracleParameter("A_INGREDIENT_CODE", OracleDbType.NVarchar2, 50); p2.Direction = ParameterDirection.Input; p2.Value = ingCode; oraCmd.Parameters.Add(p2); OracleParameter p3 = new OracleParameter("A_FEED_CODE", OracleDbType.NVarchar2, 30); p3.Direction = ParameterDirection.Input; p3.Value = feedCode; oraCmd.Parameters.Add(p3); OracleParameter p4 = new OracleParameter("A_MOVEMENT_TYPE", OracleDbType.NVarchar2, 10); p4.Direction = ParameterDirection.Input; p4.Value = movementType; oraCmd.Parameters.Add(p4); OracleParameter p5 = new OracleParameter("A_MOVEMENT_DATE", OracleDbType.NVarchar2, 10); p5.Direction = ParameterDirection.Input; p5.Value = movementDate; oraCmd.Parameters.Add(p5); OracleParameter p6 = new OracleParameter("A_MOVEMENT_QTY", OracleDbType.Int64, 12); p6.Direction = ParameterDirection.Input; p6.Value = pounds; oraCmd.Parameters.Add(p6); OracleParameter p7 = new OracleParameter("INVENTORY_TYPE", OracleDbType.NVarchar2, 10); p7.Direction = ParameterDirection.Input; p7.Value = inventoryType; oraCmd.Parameters.Add(p7); OracleParameter p8 = new OracleParameter("A_CREATE_USERID", OracleDbType.NVarchar2, 20); p8.Direction = ParameterDirection.Input; p8.Value = userID; oraCmd.Parameters.Add(p8); OracleParameter p9 = new OracleParameter("A_RETURN_VALUE", OracleDbType.Int32, 10); p9.Direction = ParameterDirection.Output; oraCmd.Parameters.Add(p9); //open and execute oraConn.Open(); oraCmd.ExecuteNonQuery(); oraConn.Close(); } } catch (OracleException oraEx) { msg = "An error has occured in the database: " + oraEx.ToString(); } catch (Exception ex) { msg = "An error has occured: " + ex.ToString(); } finally { //close connection oraConn.Close(); } return msg;

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  • Java Generics: Dealing with an intermediate unknown type

    - by Matt
    I am trying to figure out a way to deal with a particular problem in a type safe manner, or to put it more specifically without any explicit casts. I have a class that takes in a generic request and returns a generic response like such: public class RetrievalProcessor<Req extends Request, Resp> implements RequestProcessor<Req, Resp>{ private Dao<Req> dao; private RawResponseTransformer<Resp> transformer; @Override public Resp process(Req request) { return transformer.transformResponse(dao.retrieveRawResponse(request)); } } My problem is the following. My Dao object can be many different things REST, JDBC, some other proprietary object. I can't be certain of the type of object that the Dao will return. I do know the type of object my caller would like and that is the Resp type on the generic, and the job of the RawResponseTransformer is to transform that Dao response into something that the caller can consume. The problem I have is I can't figure out a way that feels clean to do that. I have considered putting the intermediate type as part of the definition of the class, but it doesn't seem like the caller should know, or really care, what the intermediate form is. Hoping someone might have a good clean idea for handling this.

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  • How can I customise Zend_Form regex error messages?

    - by Matt
    I have the following code: $postcode = $form-createElement('text', 'postcode'); $postcode-setLabel('Post code:'); $postcode-addValidator('regex', false, array('/^[a-z]{1,3}[0-9]{1,3} ?[0-9]{1,3}[a-z]{1,3}$/i')); $postcode-addFilters(array('StringToUpper')); $postcode-setRequired(true); It creates an input field in a form and sets a regex validation rule and works just fine. The problem is that the error message it displays when a user enters an invalid postcode is this: 'POSTCODE' does not match against pattern '/^[a-z]{1,3}[0-9]{1,3} ?[0-9]{1,3}[a-z]{1,3}$/i' (where input was POSTCODE) How can I change this message to be a little more friendly?

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  • Getting Started with CacheMoney

    - by Matt Grande
    I recently installed cache-money. After some difficulties getting memcached and cache-money set up, I thought I had it working. It cached the one query on my login page fine. I login, and go to my message index page and get this error: indices delegated to @cache_config.indices, but @cache_config is nil: Slug(id: integer, name: string, sluggable_id: integer, sequence: integer, sluggable_type: string, scope: string, created_at: datetime) Searching for the first part of that error message returns 0 hits on Google, so I'm at a loss on where to even begin. Any suggestions?

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  • java.lang.NoSuchMethodError: main when starting HelloWorld with Eclipse Scala plugin

    - by Matt Sheppard
    I've just been playing with Scala, and installed the Eclipse plugin as described at http://www.scala-lang.org/node/94, but after entering the "Hello World" test example and setting up the run configuration as described, I get the following error Exception in thread "main" java.lang.NoSuchMethodError: main For reference the code is package hello object HelloWorld extends Application { println("Hello World!") } I've tinkered a bit with the obvious solutions (adding a main method, adding a singleton object with a main method) but I'm clearly doing something wrong. Can anyone get their test example to work, or point out what I am doing wrong?

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  • Python for a hobbyist programmer ( a few questions)

    - by Matt
    I'm a hobbyist programmer (only in TI-Basic before now), and after much, much, much debating with myself, I've decided to learn Python. I don't have a ton of free time to teach myself a hundred languages and all programming I do will be for personal use or for distributing to people who need them, so I decided that I needed one good, strong language to be good at. My questions: Is python powerful enough to handle most things that a typical programmer might do in his off-time? I have in mind things like complex stat generators based on user input for tabletop games, making small games, automate install processes, and build interactive websites, but probably a hundred things along those lines Does python handle networking tasks fairly well? Can python source be obscufated (mispelled I think), or is it going to be open-source by nature? The reason I ask this is because if I make something cool and distribute it, I don't want some idiot script kiddie to edit his own name in and say he wrote it And how popular is python, compared to other languages. Ideally, my language would be good and useful with help found online without extreme difficulty, but not so common that every idiot with computer knows python. I like the idea of knowing a slightly obscure language. Thanks a ton for any help you can provide.

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  • Mysql Sub Select Query Optimization

    - by Matt
    I'm running a query daily to compile stats - but it seems really inefficient. This is the Query: SELECT a.id, tstamp, label_id, (SELECT author_id FROM b WHERE b.tid = a.id ORDER BY b.tstamp DESC LIMIT 1) AS author_id FROM a, b WHERE (status = '2' OR status = '3') AND category != 6 AND a.id = b.tid AND (b.type = 'C' OR b.type = 'R') AND a.tstamp1 BETWEEN {$timestamp_start} AND {$timestamp_end} ORDER BY b.tstamp DESC LIMIT 500 This query seems to run really slow. Apologies for the crap naming - I've been asked to not reveal the actual table names. The reason there is a sub select is because the outer select gets one row from the table a and it gets a row from table b. But also need to know the latest author_id from table b as well, so I run a subselect to return that one. I don't want to run another select inside a php loop - as that is also inefficient. It works correctly - I just need to find a much faster way of getting this data set.

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  • In Objective C, what's the best way to extract multiple substrings of text around multiple patterns?

    - by Matt
    For one NSString, I have N pattern strings. I'd like to extract substrings "around" the pattern matches. So, if i have "the quick brown fox jumped over the lazy dog" and my patterns are "brown" and "lazy" i would like to get "quick brown fox" and "the lazy dog." However, the substrings don't necessarily need to be delimited by whitespace. I have a hunch that there's a very easy solution to this, but I admit a disturbing lack of knowledge of Objective C string functions.

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  • NSTableView get rid blank space separating columns

    - by Matt S.
    I have an NSTableView with 4 columns. I also have a custom background color for each row. The only problem is I have these ugly white spaces where the gridlines would go in both the horizontal and vertical axis. I have both unchecked in IB, but they still show up. How can I get rid of the vertical ones and change the color and size of the horizontal ones? Here's what I see:

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  • Writing a Jeweler Rakefile that adds dependencies depending on RUBY_ENGINE (ruby or jruby)

    - by Matt Zukowski
    I have a Rakefile that includes this: Jeweler::Tasks.new do |gem| # ... gem.add_dependency('json') end The gemspec that this generates builds a gem that can't be installed on jruby because the 'json' gem is native. For jruby, this would have to be: Jeweler::Tasks.new do |gem| # ... gem.add_dependency('json-jruby') end How do I conditionally add the dependency for 'json-jruby' when RUBY_ENGINE == 'java'? It seems like my only option is to manually edit the gemspec file that jeweler generates to add the RUBY_ENGINE check. But I'd rather avoid this, since it kind of defeats the purpose of using jeweler in the first place. Any ideas?

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  • Base64 en/decoding between xstream and iPhone SDK

    - by Matt McMinn
    I am passing a byte array from a java server to an iPad client in XML. The server is using xstream to convert the byte array to XML with the EncodedByteArrayConverter, which should convert the array to Base 64. Using xstream, I can decode the xml back to the proper byte array in a java client, but in the iPad client, I'm getting an invalid length error. To do my decoding, I'm using the code at the bottom of this page. The length of the string is indeed not a multiple of 4, so there must be something strange with my string - although since xstream can decode it just fine, I'm guessing there's just something I need to to on the iPad side to get it to decode. I've tried cutting off padding at the end of the string to get it down to the right size, and that does allow the decoder to work, but I end up with JPG's that have invalid headers, and are not displayable. On the server side, I'm using the following code: Object rtrn = getByteArray(); XStream xstream = new XStream(); String xml = xstream.toXML(rtrn); On the client side, I'm calling the above decoder from the XML parsing callback like this: -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { NSLog(@"Converting data; string length: %d", [string length]); //NSLog(@"%@", string); NSData *data = [Base64 decode:string]; NSLog(@"converted data length: %d", [data length]); } Any ideas what could be going wrong?

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  • Changing data in a django modelform

    - by Matt Hampel
    I get data in from POST and validate it via this standard snippet: entry_formset = EntryFormSet(request.POST, request.FILES, prefix='entries') if entry_formset.is_valid(): .... The EntryFormSet modelform overrides a foreign key field widget to present a text field. That way, the user can enter an existing key (suggested via an Ajax live search), or enter a new key, which will be seamlessly added. I use this try-except block to test if the object exists already, and if it doesn't, I add it. entity_name = request.POST['entries-0-entity'] try: entity = Entity.objects.get(name=entity_name) except Entity.DoesNotExist: entity = Entity(name=entity_name) entity.slug = slugify(entity.name) entity.save() However, I now need to get that entity back into the entry_formset. It thinks that entries-0-entity is a string (that's how it came in); how can I directly access that value of the entry_formset and get it to take the object reference instead?

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  • Invert 1 bit in C#

    - by Matt Jacobsen
    I have 1 bit in a byte (always in the lowest order position) that I'd like to invert. ie given 00000001 I'd like to get 00000000 and with 00000000 I'd like 00000001. I solved it like this: bit > 0 ? 0 : 1; I'm curious to see how else it could be done.

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  • EJB3 Transaction Propogation

    - by Matt S.
    I have a stateless bean something like: @Stateless public class MyStatelessBean implements MyStatelessLocal, MyStatelessRemote { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.SUPPORTED) public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.process(obj); } } @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } The typically usage then is the client would call processObjects(...), which doesn't actually interact with the entity manager. It does what it needs to do and calls process(...) individually for each object to process. The duration of process(...) is relatively short, but processObjects(...) could take a very long time to run through everything. Therefore I don't want it to maintain an open transaction. I do need the individual process(...) operations to operate within their own transaction. This should be a new transaction for every call. Lastly I'd like to keep the option open for the client to call process(...) directly. I've tried a number of different transaction types: never, not supported, supported (on processObjects) and required, requires new (on process) but I get TransactionRequiredException every time merge() is called. I've been able to make it work by splitting up the methods into two different beans: @Stateless @TransationAttribute(TransactionAttributeType.NOT_SUPPORTED) public class MyStatelessBean1 implements MyStatelessLocal1, MyStatelessRemote1 { @EJB private MyStatelessBean2 myBean2; public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.myBean2.process(obj); } } } @Stateless public class MyStatelessBean2 implements MyStatelessLocal2, MyStatelessRemote2 { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } but I'm still curious if it's possible to accomplish this in one class. It looks to me like the transaction manager only operates at the bean level, even when individual methods are given more specific annotations. So if I mark one method in a way to prevent the transaction from starting calling other methods within that same instance will also not create a transaction, no matter how they're marked? I'm using JBoss Application Server 4.2.1.GA, but non-specific answers are welcome / preferred.

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  • Can't get SplitLayoutPanel working - GWT + UIBinder are driving me crazy

    - by Matt H
    ... <g:VerticalPanel styleName="{style.mainVerticalPanel}"> <g:SplitLayoutPanel> <g:north size="700"> <g:VerticalPanel> <g:ScrollPanel styleName="{style.conversationPanelContainer}"> <g:FlexTable ui:field="conversationPanel" styleName="{style.conversationPanel}"></g:FlexTable> </g:ScrollPanel> <g:HorizontalPanel styleName="{style.messageTextAndSendPanel}"> <g:TextBox ui:field="messageText" styleName="{style.messageText}"></g:TextBox><g:Button ui:field="sendButton">Send</g:Button> </g:HorizontalPanel> </g:VerticalPanel> </g:north> <g:south size="300"> <g:button>TestButton</g:button> </g:south> </g:SplitLayoutPanel> </g:VerticalPanel> ... Anything look wrong with this? All I'm trying to do is make a simple split panel but whenever I run this all I get is a blank page. Without any of the SplitPanel stuff, it works fine. The same happens with DockLayoutPanel.

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  • Anti-aliased text on HTML5's canvas element

    - by Matt Mazur
    I'm a bit confused with the way the canvas element anti-aliases text and am hoping you all can help. In the following screenshot the top "Quick Brown Fox" is an H1 element and the bottom one is a canvas element with text rendered on it. On the bottom you can see both "F"s placed side by side and zoomed in. Notice how the H1 element blends better with the background: http://jmockups.s3.amazonaws.com/canvas_rendering_both.png Here's the code I'm using to render the canvas text: var canvas = document.getElementById('canvas'); if (canvas.getContext){ var ctx = canvas.getContext('2d'); ctx.fillStyle = 'black'; ctx.font = '26px Arial'; ctx.fillText('Quick Brown Fox', 0, 26); } Is it possible to render the text on the canvas in a way so that it looks identical to the H1 element? And why are they different?

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  • Request for the permission of type 'System.Data.Odbc.OdbcPermission.. help needed

    - by Matt
    I'm getting the following error when trying to connect to a remote mysql server. Request for the permission of type 'System.Data.Odbc.OdbcPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. I've installed the odbc 5.1 driver, and can connect to the database using the Data Sources (ODBC) tool in Control Panel. However when I try and run my C# scrip to connect, I get the above error. I've read its something to do with trust levels or something? I don't quite understand what people were talking about though. I went to C:... Framework/v2.0.50727/CONFIG and added to the medium and high trust.config files, but that didn't help.. Can someone help me out here please? My connection string is MyConString = "DRIVER={MySQL ODBC 5.1 Driver};" + "SERVER=" + m_strHost + ";" + "PORT=3306;" + "DATABASE=" + m_strDatabase + ";" + "UID=" + m_strUserName + ";" + "PWD=" + m_strPassword + ";" + "OPTION=3;";

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  • Is there any danger in calling free() or delete instead of delete[]? [closed]

    - by Matt Joiner
    Possible Duplicate: ( POD )freeing memory : is delete[] equal to delete ? Does delete deallocate the elements beyond the first in an array? char *s = new char[n]; delete s; Does it matter in the above case seeing as all the elements of s are allocated contiguously, and it shouldn't be possible to delete only a portion of the array? For more complex types, would delete call the destructor of objects beyond the first one? Object *p = new Object[n]; delete p; How can delete[] deduce the number of Objects beyond the first, wouldn't this mean it must know the size of the allocated memory region? What if the memory region was allocated with some overhang for performance reasons? For example one could assume that not all allocators would provide a granularity of a single byte. Then any particular allocation could exceed the required size for each element by a whole element or more. For primitive types, such as char, int, is there any difference between: int *p = new int[n]; delete p; delete[] p; free p; Except for the routes taken by the respective calls through the delete-free deallocation machinery?

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  • How to handle User "confirmation" with Watir/Cucumber?

    - by Matt Darby
    I'm new to Watir and I've having a little trouble getting logged in in my tests. I use authlogic as my authentication method of choice. When a User registers, they are sent an email with a confirmation link. Clicking this link confirms their account and they can then login. The issue I'm having is how do I confirm the User when using Watir? I have so far: Given /I sign up/ do BROWSER.goto("http://localhost:3000/register") BROWSER.text_field(:id, "user_email").set("[email protected]") BROWSER.text_field(:id, "user_name").set("Foo Bar) BROWSER.text_field(:id, "user_password").set("foo bar") BROWSER.text_field(:id, "user_password_confirmation").set("foo bar") BROWSER.button(:id, "user_submit").click end Given /I am logged in via Watir/ do BROWSER.goto("http://localhost:3000/login") BROWSER.text_field(:id, "user_session_email").set("[email protected]) BROWSER.text_field(:id, "user_session_password").set("foo bar") BROWSER.button(:id, "user_session_submit").click end This correctly populates the fields and the User is saved. Now I try to confirm the User like so: Given /I am confirmed/ do User.last.confirmed! end Unfortunately this doesn't work. What am I missing?

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  • Python "Every Other Element" Idiom

    - by Matt Luongo
    Hey guys, I feel like I spend a lot of time writing code in Python, but not enough time creating Pythonic code. Recently I ran into a funny little problem that I thought might have an easy, idiomatic solution. Paraphrasing the original, I needed to collect every sequential pair in a list. For example, given the list [1,2,3,4,5,6], I wanted to compute [(1,2),(3,4),(5,6)]. I came up with a quick solution at the time that looked like translated Java. Revisiting the question, the best I could do was l = [1,2,3,4,5,6] [(l[2*x],l[2*x+1]) for x in range(len(l)/2)] which has the side effect of tossing out the last number in the case that the length isn't even. Is there a more idiomatic approach that I'm missing, or is this the best I'm going to get?

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  • What's wrong with this MySQL Stored Function?

    - by Matt
    Having trouble getting this to apply in MySQL Workbench 5.2.15 DELIMITER // CREATE DEFINER=`potts`@`%` FUNCTION `potts`.`fn_create_category_test` (test_arg VARCHAR(50)) RETURNS int BEGIN DECLARE new_id int; SET new_id = 8; RETURN new_id; END// The actual function will have a lot more between BEGIN and END but as it stands, even this 3 liner won't work. Thanks!

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  • using WP_Query with custom SQL in wordpress

    - by Matt Facer
    Hi. I am writing a plugin for wordpress and I want to create my own search. I have tried to alter the wordpress search, but what I am doing is very specific with the SQL query. I am comparing lat and long coordinates and getting posts based on that. I can display posts by using the standard wpdb query, but then I don't get the other features like paging. I'd like to be able to use my SQL statement with the WP_Query function. If I'm right in thinking, I should then be able to use the paging and other features which come from the $posts global variable. Is this right?? I've googled for hours but can't find anything for plugins outside of using args to select categories etc. I simply need to send a complete SQL command - nothing else. Many thanks....

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