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• Resources for Programmatic Rendering of Topology Maps

  - by bn

  Servus, Do you know of any frameworks, APIS, languages, or other resources that are well suited for drawing topology maps that allow a user to interact with objects on the map? I am not constrained by language choice and the program can be web-based, or stand-alone. I thought I would check before rolling my own. My goal is not to draw cartographic maps, but more like this picture: http://www.fineconnection.com/files/images/GraphicalNM.PNG, or if you are familiar with Edward Tufte's books, the data-visualization mechanisms he describes such as a map of a metro or subway. Also, if you have had any experience rendering these types of user interfaces or usage of underlying datastructures, I would be grateful to hear any thoughts you have on the subject, advice, any "gotchas." Thank you very for your time, -bn

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• Tomcat, Hibernate and the java.io.EOFException

  - by Marco

  Hi, My Java application, which uses Hibernate and it's hosted by Tomcat 6.0, gets the following exception after a long time of inactivity when it tries to access the DB: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.io.EOFException STACKTRACE: java.io.EOFException at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1963) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2375) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) at org.hibernate.loader.Loader.getResultSet(Loader.java:1812) at org.hibernate.loader.Loader.doQuery(Loader.java:697) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) at org.hibernate.loader.Loader.doList(Loader.java:2232) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) at org.hibernate.loader.Loader.list(Loader.java:2124) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) Any tips? Thanks

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• WebClient.UploadFile() throws exception while uploading files to sharepoint

  - by Royson

  In my application i am uploading files to sharepoint 2007. I am using using (WebClient webClient = new WebClient()) { webClient.Credentials = new NetworkCredential(userName, password); webClient.Headers.Add("Content-Type", "application/x-vermeer-urlencoded"); webClient.Headers.Add("X-Vermeer-Content-Type", "application/x-vermeer-urlencoded"); String result = Encoding.UTF8.GetString(webClient.UploadData(webUrl + "/_vti_bin/_vti_aut/author.dll","POST", data.ToArray())); } the code is running successfully..but for some files it throws exception The underlying connection was closed: The connection was closed unexpectedly. at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request) at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data) at System.Net.WebClient.UploadData(String address, String method, Byte[] data) Any Ideas what I have done wrong? I am using VS-2008 2.0

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• Delphi TerminateThread equivalent for Android

  - by Martin

  I have been discussing a problem on the Indy forums related to a thread that is not terminating correctly under Android. They have suggested that there may be an underlying problem with TThread for ARC. Because this problem is holding up the release of a product a work around would be to simply forcibly terminate the thread. I know this is not nice but in this case I cant think of a side effect from doing so. Its wrong but its better than a deadlocked app. Is there a way to forcibly terminate a thread under Android like TerminateThread does under windows? Martin

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• Core Data store corruption

  - by sehugg

  A handful of customers for my iPhone app are experiencing Core Data store corruption (I assume so, since the error is "Failed to save to data store: Operation could not be completed. (Cocoa error 259.)") Has anyone else experienced this kind of store corruption? I am worried since I aim to soon push an update which performs a schema migration, and I am worried that this will expose even more problems. I had assumed that the Core Data/SQLlite APIs use atomic operations and are immune to corruption except if the underlying filesystem experiences corruption. Is there a way to reduce/prevent corruption, or at least a good way to reproduce (I have been unsuccessful thus far).

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• Why can .NET not have memory leaks?

  - by Dinah

  Ignoring unsafe code, .NET cannot have memory leaks. I've read this endlessly from many experts and I believe it. However, I do not understand why this is so. It is my understanding that the framework itself is written in C++ and C++ is susceptible to memory leaks. Is the underlying framework so well-written, that it absolutely does not have any possibility of internal memory leaks? Is there something within the framework's code that self-manages and even cures its own would-be memory leaks? Is the answer something else that I haven't considered?

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• How would you audit ASP.NET Membership tables, while recording what user made the changes?

  - by Pete

  Using a trigger-based approach to audit logging, I am recording the history of changes made to tables in the database. The approach I'm using (with a static sql server login) to record which user made the change involves running a stored procedure at the outset of each database connection. The triggers use this username when recording the audit rows. (The triggers are provided by the product OmniAudit.) However, the ASP.NET Membership tables are accessed primarily through the Membership API. I need to pass in the current user's identity when the Membership API opens its database connection. I tried subclassing MembershipProvider but I cannot access the underlying database connection. It seems like this would be a common problem. Does anyone know of any hooks we can access when the ASP.NET Membership makes its database connection?

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• C# Throw Exception on use Assert?

  - by guazz

  I have a system where the employeeId must alway exist unless there is some underlying problem. The way I see it, is that I have two choices to check this code: 1: public void GetEmployee(Employee employee) { bool exists = EmployeeRepository.VerifyIdExists(Employee.Id); if (!exists) { throw new Exception("Id does not exist); } } or 2: public void GetEmployee(Employee employee) { EmployeeRepository.AssertIfNotFound(Employee.Id); } Is option #2 acceptable in the C# language? I like it because it's tidy in that i don't like looking at "throw new Exception("bla bla bla") type messages outsite the class scope.

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• How to stop flash content shine-through JQuery UI Dialog in FF Windows

  - by DEfusion

  I'm using the jQuery UI dialog box, in IE & FF on Windows I'm getting underlying flash content shining through the dialog box. I resolved this on IE by enabling the bgiframe option on the jQuery dialog window and changing the bgiframe script to apply to any windows browsers, however I'm still getting the shine-through on FF. Note that I can't know exactly where the flash content will be showing as it is usually flash widgets that users have added to pages, although I have thought about hiding the flash content temporarily while displaying the dialog box - is this the only option left to me?

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• Pros and cons of programmatically enforcing foreign key than in database

  - by Jeffrey

  It is causing so much trouble in terms of development just by letting database enforcing foreign key. Especially during unit test I can’t drop table due to foreign key constrains, I need to create table in such an order that foreign key constrain warning won’t get triggered. In reality I don’t see too much point of letting database enforcing the foreign key constrains. If the application has been properly designed there should not be any manual database manipulation other than select queries. I just want to make sure that I am not digging myself into a hole by not having foreign key constrains in database and leaving it solely to the application’s responsibility. Am I missing anything? P.S. my real unit tests (not those that use mocking) will drop existing tables if the structure of underlying domain object has been modified.

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• Using an XML Catalog with a Java library that uses JAXP internally

  - by Brian Ferris

  I'm using the Apache web service xml rpc library to make requests to an rpc service. Somewhere in that process is a xml document with a DTD reference to http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd, which the library attempts to download when parsing the XML. That download fails with a 503 status code because the w3c is blocking repeated downloads of this largely static document from Java clients. The solution is XML Catalogs to locally cache the DTD. However, while I can find examples of setting an EntityHandler on a JAXP SAXParser instance directly to enable catalog parser support, I don't actually have access to the underlying parser here. It's just being used by the xml rpc library. Is there any way I can set a global property or something that will tell JAXP to use XML catalogs?

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• C# Linq Entity Conversion Error on Nonexistent Value?

  - by Ryan

  While trying to query some data using the Linq Entity Framework I'm receiving the following exception: {"Conversion failed when converting the varchar value '3208,7' to data type int."} The thing that is confusing is that this value does not even exist in the view I am querying from. It does exist in the table the view is based on, however. The query I'm running is the following: return context.vb_audit_department .Where(x => x.department_id == department_id && x.version_id == version_id) .GroupBy(x => new { x.action_date, x.change_type, x.user_ntid, x.label }) .Select(x => new { action_date = x.Key.action_date, change_type = x.Key.change_type, user_ntid = x.Key.user_ntid, label = x.Key.label, count = x.Count(), items = x }) .OrderByDescending(x => x.action_date) .Skip(startRowIndex) .Take(maximumRows) .ToList(); Can somebody explain why LINQ queries the underlying table instead of the actual view, and if there is any way around this behavior?

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• How do I properly handle a faulted WCF connection?

  - by mafutrct

  In my client program, there is a WCF connection that is opened at startup and supposedly stays connected til shutdown. However, there is a chance that the server closes due to unforeseeable circumstances (imagine someone pulling the cable). Since the client uses a lot of contract methods in a lot of places, I don't want to add a try/catch on every method call. I've got 2 ideas for handling this issue: Create a method that takes a delegate and executes the delegate inside a try/catch and returns an Exception in case of a known exception, or null else. The caller has to deal with nun-null results. Listen to the Faulted event of the underlying CommunicationObject. But I don't see how I could handle the event except for displaying some error message and shutting down. Are there some best practices for faulted WCF connection that exist for app lifetime?

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• Integrating Pentaho/Talend/etc. with an OR Mapper

  - by DaDaDom

  We have an application (Java) with an own OR mapper. Within this system we have what can be compared to Hibernate's interceptors (we call it triggers): Do specific actions just before saving data in the database, after it's deleted and so on. The underlying database is MySQL. Now we would like to use tools such as Pentaho Data Integration or Talend to convert data to put it into our system. It's no problem to do that directly on the SQL level, but by doing so we loose the built-in power of our triggers. Is there a way to somehow integrate any of the Data Integration solutions into our existing application? It would be great if there was a way to write into instances of our classes instead of writing into the database directly. Any hints welcome :-)

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• problem using base64 encoder and InputStreamReader

  - by karoberts

  I have some CLOB columns in a database that I need to put Base64 encoded binary files in. These files can be large, so I need to stream them, I can't read the whole thing in at once. I'm using org.apache.commons.codec.binary.Base64InputStream to do the encoding, and I'm running into a problem. My code is essentially this FileInputStream fis = new FileInputStream(file); Base64InputStream b64is = new Base64InputStream(fis, true, -1, null); InputStreamReader reader = new InputStreamReader(b64is); preparedStatement.setCharacterStream(1, reader); When I run the above code, I get one of these during the execution of the update java.io.IOException: Underlying input stream returned zero bytes, it is thrown deep in the InputStreamReader code. Why would this not work? It seems to me like the reader would attempt to read from the base 64 stream, which would read from the file stream, and everything should be happy.

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• Greasemonkey: load url using GM_xmlhttpRequest and createContextualFragment

  - by Dave

  I have the following GreaseMonkey Script: GM_xmlhttpRequest({ method: 'GET', url: "http://www.testurl.com", headers: { 'User-agent': 'Mozilla/4.0 (compatible) Greasemonkey/0.3', }, onload: function(responseDetails) { var tagString = responseDetails.responseText; var range = document.createRange(); range.selectNode(document.body); var documentFragment = range.createContextualFragment(tagString); How do I now extract stuff from documentFragment? documentFragment.getElementById(''), document.body etc all returns undefined. I suspect this is due to the createContextualFragment method returning a XPCNativeWrapper object, but how do I work around this to access the underlying DOM? Thanks

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• Should I throw my own ArgumentOutOfRangeException or let one bubble up from below?

  - by Neil N

  I have a class that wraps List< I have GetValue by index method: public RenderedImageInfo GetValue(int index) { list[index].LastRetrieved = DateTime.Now; return list[index]; } If the user requests an index that is out of range, this will throw an ArgumentOutOfRangeException . Should I just let this happen or check for it and throw my own? i.e. public RenderedImageInfo GetValue(int index) { if (index >= list.Count) { throw new ArgumentOutOfRangeException("index"); } list[index].LastRetrieved = DateTime.Now; return list[index]; } In the first scenario, the user would have an exception from the internal list, which breaks mt OOP goal of the user not needing to know about the underlying objects. But in the second scenario, I feel as though I am adding redundant code. Edit: And now that I think of it, what about a 3rd scenario, where I catch the internal exception, modify it, and rethrow it?

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• How to reload a table view in a view controller in iphone?

  - by Warrior

  I am new to iphone development.I have created a table view in a view controller. I want to reload the table view so that i can display the contents which are parsed previously in delegates. More over reloadData does only reload the cells. It doesn't take care of actually updating the underlying datasource. E.g. if i read data from an array in tableView:cellForRowAtIndexPath:, I have to change the array values befor calling reloadData. How can i achieve this. Please help me out.Thanks.

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• SSL HandShake on Java Client

  - by JKV

  I have a very basic doubt in SSL HandShake. Assume that we have a server S which uses self signed certificates. I write a Java client C which connects to the S. When C connects to S, C gets certificates from S and saves them to its truststore and the remaining part of the communication proceeds. After some time I use the same C to connect to the S, so will S send the certificates again to C, or C will use the certificates already stored in truststore. I am not good in SSL and underlying implementation of Truststore functionality in Java. Will S send the certificates to C invariable of whether the C has certificates on its truststore?? I believe that if I have certificates in truststore C trusts S and C will not ask for certificates when I connect again?? Is my assumption right?? Is the process same for self-signed certificates and CA certificates?? Thanks in advance.

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• Release Excel Object In My Destructor

  - by Murat

  Hi all, I'm writing a Excel class using Microsoft.Interropt.Excel DLL. I finish all function but I have an error in my Destructor. I Want to save all changes to my file and I want to release all source. I want to all of them in my destructor. But In my destructor, Excel.ApplicationClass, Workbook and Worksheet objects are fill by an Exception which have message "COM object that has been separated from its underlying RCW cannot be used." So I can't save nothing, close nothing because i can't access workbook or worksheet object. Can't I access the class private members in Destructor?

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• ExpectedException on TestMethod Visual Studio 2010

  - by Joop

  Today I upgraded my solution with all the underlying projects from VS2008 to VS2010. Everything went well except for my unit tests. First of all only the web projects had as target framework .NET 4. All the other projects still had .NET 3.5. I changed them all to .NET 4. Now when I debug my unit tests it breaks on every exception. In 2008 it just wouldn't pass and tell me that an exception occurred. Even when I have the ExpectedException attribute defined it stops debugging on every exception. And example of one of my tests: [TestMethod] [ExpectedException(typeof(EntityDoesNotExistException))] public void ConstructorTest() { AddressType type = new AddressType(int.MaxValue); } The EntityDoesNotExistException is a custom exception and inherits Exception.

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• Global find object references in NHibernate

  - by Miral

  Is it possible to perform a global reversed-find on NHibernate-managed objects? Specifically, I have a persistent class called "Io". There are a huge number of fields across multiple tables which can potentially contain an object of that type. Is there a way (given a specific instance of an Io object), to retrieve a list of objects (of any type) that actually do reference that specific object? (Bonus points if it can identify which specific fields actually contain the reference, but that's not critical.) Since the NHibernate mappings define all the links (and the underlying database has corresponding foreign key links), there ought to be some way to do it.

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• CommunicationException in WCF

  - by user343159

  Hi I have a problem with a WCF Service I've just created. This was working yesterday but for some reason it's just stopped working. One of my WCF methods returns an array of an Entity Framework entity, like this: public BranchContactDetail[] GetClosestBranches(string postcode, int howManyBranches) { GeoLocation geoLocation = GetLocationFromPostcode(postcode); Location location = new Location(geoLocation.Latitude, geoLocation.Longitude); using (BranchDirectoryEntities entities = new BranchDirectoryEntities()) { var branchesInOrder = entities.BranchContactDetails .Where(b => b.latitude.HasValue && b.longitude.HasValue ) .OrderBy(b => location.DistanceFrom(b.latitude, b.longitude)) .Take(howManyBranches) .ToArray(); return branchesInOrder; } } ...and, as I say, this was working fine yesterday. Now I'm getting a "The underlying connection was closed: The connection was closed unexpectedly." I've hunted all over the web but no-one seems to know the answer. Anyone shed any light on this issue? Regards, Mark

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• C++ min heap with user-defined type.

  - by bsg

  Hi, I am trying to implement a min heap in c++ for a struct type that I created. I created a vector of the type, but it crashed when I used make_heap on it, which is understandable because it doesn't know how to compare the items in the heap. How do I create a min-heap (that is, the top element is always the smallest one in the heap) for a struct type? The struct is below: struct DOC{ int docid; double rank; }; I want to compare the DOC structures using the rank member. How would I do this? I tried using a priority queue with a comparator class, but that also crashed, and it also seems silly to use a data structure which uses a heap as its underlying basis when what I really need is a heap anyway. Thank you very much, bsg

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• Can I set a property on an object that is only declared on the instance type, when I don't know the

  - by WilberBeast

  Let me explain. I have a List into which I am adding various ASP.NET controls. I then wish to loop through the list and set a CssClass, however not every Control supports the property CssClass. What I would like to do is test if the underlying instance type supports the CssClass property and set it, but I'm not sure how to do the conversion prior to setting the property since I don't know the type of each Control object. I know that I can use typeof or x.GetType(), but I'm not sure how to use these to convert the controls back to the instance type in order to test for and then set the property. Actually I seem to have solved this, so I thought that I would post the code here for others. foreach (Control c in controlList) { PropertyInfo pi = c.GetType().GetProperty("CssClass"); if (pi != null) pi.SetValue(c, "desired_css_class", null); } I hope that this helps someone else as I has taken me hours to research these 2 lines of code. Cheers Steve

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