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• 'Programming by Coincidence' Excercise: Java File Writer

  - by Tapas

  I just read the article Programming by Coincidence. At the end of the page there are excercises. A few code fragments that are cases of "programming by coincidence". But I cant figure out the error in this piece: This code comes from a general-purpose Java tracing suite. The function writes a string to a log file. It passes its unit test, but fails when one of the Web developers uses it. What coincidence does it rely on? public static void debug(String s) throws IOException { FileWriter fw = new FileWriter("debug.log", true); fw.write(s); fw.flush(); fw.close(); } What is wrong about this?

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• How does Fluent NHibernate support the Import Entity

  - by Bender

  I want to create a strongly type object from a fluent NHibernate query. If I were using HQL and NHibernate I belive I would need: the class for the output Namespace Model Public Class namecount Public Overridable Property lastname() as string ... Public Overridable Property lastnamecount() as integer ... Public Sub New(lastname as string, count as integer) ... End Class End Namespace an .hbm.xml file <?xml ...> <hibernate-mapping ...> <import class="model.namecount,model"> </hibernate-mapping> and of course the query _session.createquery("select new namecount(lastname, count(lastname)) ...") (The above is a paraphrased example taken from one of the 2008 SummerofNHibernate videos) I cannot find any examples of how to do this with fluent (even in C#), is it possible? If it isn't is there a VB example of how to mix Fluent and .hbm.xml

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• How to write a cctor and op= for a factory class with ptr to abstract member field?

  - by Kache4

  I'm extracting files from zip and rar archives into raw buffers. I created the following to wrap minizip and unrarlib: Archive.hpp #include "ArchiveBase.hpp" #include "ArchiveDerived.hpp" class Archive { public: Archive(string path) { /* logic here to determine type */ switch(type) { case RAR: archive_ = new ArchiveRar(path); break; case ZIP: archive_ = new ArchiveZip(path); break; case UNKNOWN_ARCHIVE: throw; break; } } Archive(Archive& other) { archive_ = // how do I copy an abstract class? } ~Archive() { delete archive_; } void passThrough(ArchiveBase::Data& data) { archive_->passThrough(data); } Archive& operator = (Archive& other) { if (this == &other) return *this; ArchiveBase* newArchive = // can't instantiate.... delete archive_; archive_ = newArchive; return *this; } private: ArchiveBase* archive_; } ArchiveBase.hpp class ArchiveBase { public: // Is there any way to put this struct in Archive instead, // so that outside classes instantiating one could use // Archive::Data instead of ArchiveBase::Data? struct Data { int field; }; virtual void passThrough(Data& data) = 0; /* more methods */ } ArchiveDerived.hpp "Derived" being "Zip" or "Rar" #include "ArchiveBase.hpp" class ArchiveDerived : public ArchiveBase { public: ArchiveDerived(string path); void passThrough(ArchiveBase::Data& data); private: /* fields needed by minizip/unrarlib */ // example zip: unzFile zipFile_; // example rar: RARHANDLE rarFile_; } ArchiveDerived.cpp #include "ArchiveDerived.hpp" ArchiveDerived::ArchiveDerived(string path) { //implement } ArchiveDerived::passThrough(ArchiveBase::Data& data) { //implement } Somebody had suggested I use this design so that I could do: Archive archiveFile(pathToZipOrRar); archiveFile.passThrough(extractParams); // yay polymorphism! How do I write a cctor for Archive? What about op= for Archive? What can I do about "renaming" ArchiveBase::Data to Archive::Data? (Both minizip and unrarlib use such structs for input and output. Data is generic for Zip & Rar and later is used to create the respective library's struct.)

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• The .NET ActiveX component with WPF content can't be loaded by non MFC app

  - by lonelyflyer

  I have a legacy delphi program and want to add some content implemented with WPF. So I encapsulate the WPF control with a .NET/ActiveX interop technology. That means something like: [ComRegisterFunction()] public static void RegisterClass(string key); [ComUnregisterFunction()] public static void UnregisterClass(string key); The activeX component is a WinForms User Control and the WPF materials are attached to an ElemenHost in this User Control. It works fine if the host app of this ActiveX is a MFC program even without /clr switch. But my legacy app is a delphi program, and it always throw a stackoverflow exception within the constructor of my WPF user control as the program be started. I have no clue, Google is no help. and it has puzzled me for days.

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• Sending multiline message via sockets without closing the connection

  - by Yasir Arsanukaev

  Hello folks. Currently I have this code of my client-side Haskell application: import Network.Socket import Network.BSD import System.IO hiding (hPutStr, hPutStrLn, hGetLine, hGetContents) import System.IO.UTF8 connectserver :: HostName -- ^ Remote hostname, or localhost -> String -- ^ Port number or name -> IO Handle connectserver hostname port = withSocketsDo $ do -- withSocketsDo is required on Windows -- Look up the hostname and port. Either raises an exception -- or returns a nonempty list. First element in that list -- is supposed to be the best option. addrinfos <- getAddrInfo Nothing (Just hostname) (Just port) let serveraddr = head addrinfos -- Establish a socket for communication sock <- socket (addrFamily serveraddr) Stream defaultProtocol -- Mark the socket for keep-alive handling since it may be idle -- for long periods of time setSocketOption sock KeepAlive 1 -- Connect to server connect sock (addrAddress serveraddr) -- Make a Handle out of it for convenience h <- socketToHandle sock ReadWriteMode -- Were going to set buffering to LineBuffering and then -- explicitly call hFlush after each message, below, so that -- messages get logged immediately hSetBuffering h LineBuffering return h sendid :: Handle -> String -> IO String sendid h id = do hPutStr h id -- Make sure that we send data immediately hFlush h -- Retrieve results hGetLine h The code portions in connectserver are from this chapter of Real World Haskell book where they say: When dealing with TCP data, it's often convenient to convert a socket into a Haskell Handle. We do so here, and explicitly set the buffering – an important point for TCP communication. Next, we set up lazy reading from the socket's Handle. For each incoming line, we pass it to handle. After there is no more data – because the remote end has closed the socket – we output a message about that. Since hGetContents blocks until the server closes the socket on the other side, I used hGetLine instead. It satisfied me before I decided to implement multiline output to client. I wouldn't like the server to close a socket every time it finishes sending multiline text. The only simple idea I have at the moment is to count the number of linefeeds and stop reading lines after two subsequent linefeeds. Do you have any better suggestions? Thanks.

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• Traceability with XSD

  - by blastthisinferno

  I am trying to let my XML schema handle a little traceability functionality as I'm gathering requirements while I read through some functional specifications. (Not ideal for requirement management, but at least its a start.) What I'm doing is creating a <functionalSpec tag for each functional specification I am currently reading through. I create a <requirement tag for each requirement I find. Since I want to be able to trace where the requirement came from, I create a <trace element with the id of the <functionalSpec element. Instead of allowing myself to enter any plain-old-text in the <functionalSpecId tag, I want the XSD to validate and make sure that I only enter in an id that exists for an existing functional spec. My problem is coming in where it seems the XML Schema W3C Recommendations documentation says that what I want to do is not possible. (about 1/2 way down) {selector} specifies a restricted XPath ([XPath]) expression relative to instances of the element being declared. This must identify a node set of subordinate elements (i.e. contained within the declared element) to which the constraint applies. I'm using Oxygen to create this since I'm fairly new to XSD files, and it gives me the following error: E [Xerces] Identity Constraint error: identity constraint "KeyRef@1045a2" has a keyref which refers to a key or unique that is out of scope. So my question is does anyone know of a way that will allow me to use the same XML structure that I have below through using XSD? Below is the XML file. <?xml version="1.0" encoding="UTF-8" ?> <srs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="srs req2.xsd" xmlns="srs"> <requirements> <requirement DateCreated="2010-06-11" id="1"> <Text>The system shall...</Text> <trace> <functionalSpecId>B010134</functionalSpecId> </trace> <revisions> <revision date="2010-06-11" num="0"> <description>Initial creation.</description> </revision> </revisions> </requirement> </requirements> <functionalSpecs> <functionalSpec id="B010134" model="Model-T"> <trace> <meeting></meeting> </trace> <revisions> <revision date="2009-07-08" num="0"> <description>Initial creation.</description> </revision> <detailer>Me</detailer> <engineer>Me</engineer> </revisions> </functionalSpec> </functionalSpecs> </srs> Below is the XSD file. <?xml version="1.0" encoding="UTF-8" ?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="srs" xmlns="srs" xmlns:srs="srs" elementFormDefault="qualified"> <!-- SRS --> <xs:element name="srs" type="SRSType"> </xs:element> <xs:complexType name="SRSType"> <xs:sequence> <xs:element ref="requirements" /> <xs:element ref="functionalSpecs" /> </xs:sequence> </xs:complexType> <!-- Requirements --> <xs:element name="requirements" type="RequirementsType"> <xs:unique name="requirementId"> <xs:selector xpath="srs/requirements/requirement" /> <xs:field xpath="@id" /> </xs:unique> </xs:element> <xs:complexType name="RequirementsType"> <xs:choice maxOccurs="unbounded"> <xs:element name="requirement" type="RequirementType" /> </xs:choice> </xs:complexType> <xs:complexType name="RequirementType"> <xs:complexContent> <xs:extension base="RequirementInfo"> <xs:sequence> <xs:element name="trace" type="TraceType" maxOccurs="unbounded" minOccurs="1" /> <xs:element name="revisions" type="RequirementRevisions" /> </xs:sequence> </xs:extension> </xs:complexContent> </xs:complexType> <xs:complexType name="RequirementRevisions"> <xs:sequence> <xs:element name="revision" type="RevisionInfo" minOccurs="1" maxOccurs="unbounded" /> </xs:sequence> </xs:complexType> <xs:complexType name="RequirementInfo"> <xs:sequence> <xs:element name="Text" type="Description" /> </xs:sequence> <xs:attribute name="DateCreated" type="xs:date" use="required" /> <xs:attribute name="id" type="xs:integer" use="required" /> </xs:complexType> <!-- Functional Specs --> <xs:element name="functionalSpecs" type="FunctionalSpecsType"> <xs:unique name="functionalSpecId"> <xs:selector xpath="srs/functionalSpecs/functionalSpec" /> <xs:field xpath="@id" /> </xs:unique> </xs:element> <xs:complexType name="FunctionalSpecsType"> <xs:choice maxOccurs="unbounded"> <xs:element name="functionalSpec" type="FunctionalSpecType" /> </xs:choice> </xs:complexType> <xs:complexType name="FunctionalSpecType"> <xs:complexContent> <xs:extension base="FunctionalSpecInfo"> <xs:sequence> <xs:element name="trace" type="TraceType" maxOccurs="unbounded" minOccurs="1" /> <xs:element name="revisions" type="FunctionalSpecRevisions" /> </xs:sequence> </xs:extension> </xs:complexContent> </xs:complexType> <xs:complexType name="FunctionalSpecRevisions"> <xs:sequence> <xs:element name="revision" type="RevisionInfo" minOccurs="1" maxOccurs="unbounded" /> <xs:element name="detailer" type="xs:string" /> <xs:element name="engineer" type="xs:string" /> </xs:sequence> </xs:complexType> <xs:complexType name="FunctionalSpecInfo"> <xs:attribute name="id" type="xs:string" use="required" /> <xs:attribute name="model" type="xs:string" use="required" /> </xs:complexType> <!-- Requirements, Functional Specs --> <xs:complexType name="TraceType"> <xs:choice> <xs:element name="requirementId"> <xs:keyref refer="requirementId" name="requirementIdRef"> <xs:selector xpath="srs/requirements/requirement" /> <xs:field xpath="@id" /> </xs:keyref> </xs:element> <xs:element name="functionalSpecId"> <xs:keyref refer="functionalSpecId" name="functionalSpecIdRef"> <xs:selector xpath="srs/functionalSpecs/functionalSpec" /> <xs:field xpath="@id" /> </xs:keyref> </xs:element> <xs:element name="meeting" /> </xs:choice> </xs:complexType> <!-- Common --> <xs:complexType name="RevisionInfo"> <xs:choice> <xs:element name="description" type="Description" /> </xs:choice> <xs:attribute name="date" type="xs:date" use="required" /> <xs:attribute name="num" type="xs:integer" use="required" /> </xs:complexType> <xs:complexType name="Description" mixed="true"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="Date" type="xs:date" /> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:schema>

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• VBScript + Regular Expressions

  - by Karthik

  Dim sString sString = "John;Mary;Anne;Adam;Bill;Ester" Is there a regex I can use to retrieve the following from the above list: John (; at the end of the name) Anne (; at the beginning and end) Ester (; at the beginning) I am currently using the following regex for each: 1. Joh.* 2. .*An.* 3. .*st.* But, the above retrieves the entire string instead of the values I want. How can I get the correct values? Code: Dim oRegex : Set oRegex = New RegExp oRegex.Global = False oRegex.IgnoreCase = False 'John oRegex.Pattern = "Joh.*" Set oMatch = oRegex.Execute(sString) sName = oMatch(0) The above code retrieves the entire string, instead of only John. Same issue with the others :(

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• Strange behaviour of switch case with boolean value

  - by Nikhil Agrawal

  My question is not about how to solve this error(I already solved it) but why is this error with boolean value. My function is private string NumberToString(int number, bool flag) { string str; switch(flag) { case true: str = number.ToString("00"); break; case false: str = number.ToString("0000"); break; } return str; } Error is Use of unassigned local variable 'str'. Bool can only take true or false. So it will populate str in either case. Then why this error? Moreover this error is gone if along with true and false case I add a default case, but still what can a bool hold apart from true and false? Why this strange behaviour with bool variable?

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• Command$ value disappears

  - by AngryHacker

  I have a VB6 app. I am trying to figure out what command line parameters got passed into the application. If I type in ? Command$ into the Immediate window, it prints out the command line params fine. Same, if I place Command$ into the Watch window. However, if I assign the Command$ function to a string: Dim s as string s = Command$ the s variable will be empty. What am I missing here? I should mention that the code in question is located not in the main form, but in a DLL 2 levels down (e.g. the form calls DLL1, then DLL1 calls DLL2).

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• @Android display /res/viewable in WebView

  - by MikeNereson

  I am throwing HTML to a webview to render. In the HTML I need to load an image that I have in /res/drawable. I have /res/drawable/my_image.png and code such as this: final WebView browser = (WebView) findViewById(R.id.my_webview); String html = new MyHelper(myObject).getHtml(); browser.loadDataWithBaseURL("", html, "text/html", "UTF-8", ""); Where the String html has something like: <html><head> <h1>Here is the image</h1> <img src="my_image.png" /> </head><html> The question is, what should that image src attribute be to refer to the image in /res/drawable ~Thanks

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• PHP convert decimal into fraction and back?

  - by John Isaacks

  I want the user to be able to type in a fraction like: 1/2 2 1/4 3 And convert it into its corresponding decimal, to be saved in MySQL, that way I can order by it and do other comparisons to it. But I need to be able to convert the decimal back to a fraction when showing to the user so basically i need a function that will convert fraction string to decimal: fraction_to_decimal("2 1/4");// return 2.25 and a function that can convert a decimal to a faction string: decimal_to_fraction(.5); // return "1/2" How can I do this? Thanks!

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• Displaying large file in JTextArea.

  - by Sathish Gopal

  Hi All, I'm currently working in Swing UI Assignment. This work involves showing large file content in JTextArea. The file size can be as large as 2 GB. My initial idea is to lazily load content from the file, say 1 MB of content will be shown to the user. As the user scrolls i will retrieve the next 1 MB of content to be shown. All these operation will be happening in background thread (Swing Worker). I looked at the JTextArea API, the method insert takes String and int(position of the insert) as the parameter. This will suffice, but i'm worried about performance, because the content (1 MB at a time) retrieved will have to be converted to String object. Is there any other work around or any other alternative/better solution for this.

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• How to improve my LDAP schema?

  - by asmaier

  Hello, I have a OpenLDAP Database and it holds some project objects that look like dn: cn=Proj1,ou=Project,ou=ua,dc=org cn: Proj1 objectClass: top objectClass: posixGroup member: 001ag member: 002ag System: ABEL System: PCx Budget: ABEL:1000000:0.3 Budget: PCx:300000:0.3 One can see that the Budget attribute is a ":"-separated string, where the first part holds the name of the system the budget is for, the second part holds some budget (which may change every month) and the last entry is a conversion factor for the budget of that system. Seeing this, I thought this is bad database design, since attribute values should always be atomic. But how can I improve that in LDAP, so that I can do a direct ldapsearch or a direct ldapmodify of the budget of System "ABEL" instead of writing a script, that will have to parse and split the ":"-separated string?

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• WCF - WebReferences not working

  - by JMSA

  At the client end, I have generated a Proxy using SvcUtil.exe and it is working fine. Then I have added a WebReference to the client assembly and calling the same method. But it is not working. My program is running in console mode and the method is suppose to return a string. It is not returning the string. I just see a blank console window. No exception is thrown. And after setting a debug point on the method call I see that, program is halted on the method call for ever. What should I look for to solve the problem? I am using VS2005. And adding the webReference by right-clicking the client project and then clicking "Add Web Reference" pop-up menu.

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• Is there a way to get Apache to serve files with the question mark in their name?

  - by ldrg

  I scraped a bunch of pages using wget -m -k -E. The resulting files have names in the form foo.php?bar.html. Apache guesses everything after the ? is a query string, is there a way to tell it to ignore the ? as the query string delimiter (and see foo.php?bar.html as the requested file and not foo.php)? To save you a trip to wget manpage: -m : mirror recursively -E : foo.php?bar becomes foo.php?bar.html -k : convert links in pages (foo.php?bar now links to foo.php?bar.html inside of all the pages so they display properly)

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• access exception when invoking method of an anonymous class using java reflection

  - by Asaf David

  Hello I'm trying to use an event dispatcher to allow a model to notify subscribed listeners when it changes. the event dispatcher receives a handler class and a method name to call during dispatch. the presenter subscribes to the model changes and provide a Handler implementation to be called on changes. Here's the code (I'm sorry it's a bit long). EventDispacther: package utils; public class EventDispatcher<T> { List<T> listeners; private String methodName; public EventDispatcher(String methodName) { listeners = new ArrayList<T>(); this.methodName = methodName; } public void add(T listener) { listeners.add(listener); } public void dispatch() { for (T listener : listeners) { try { Method method = listener.getClass().getMethod(methodName); method.invoke(listener); } catch (Exception e) { System.out.println(e.getMessage()); } } } } Model: package model; public class Model { private EventDispatcher<ModelChangedHandler> dispatcher; public Model() { dispatcher = new EventDispatcher<ModelChangedHandler>("modelChanged"); } public void whenModelChange(ModelChangedHandler handler) { dispatcher.add(handler); } public void change() { dispatcher.dispatch(); } } ModelChangedHandler: package model; public interface ModelChangedHandler { void modelChanged(); } Presenter: package presenter; public class Presenter { private final Model model; public Presenter(Model model) { this.model = model; this.model.whenModelChange(new ModelChangedHandler() { @Override public void modelChanged() { System.out.println("model changed"); } }); } } Main: package main; public class Main { public static void main(String[] args) { Model model = new Model(); Presenter presenter = new Presenter(model); model.change(); } } Now, I except to get the "model changed" message. However, I'm getting an java.lang.IllegalAccessException: Class utils.EventDispatcher can not access a member of class presenter.Presenter$1 with modifiers "public". I understand that the class to blame is the anonymous class i created inside the presenter, however I don't know how to make it any more 'public' than it currently is. If i replace it with a named nested class it seem to work. It also works if the Presenter and the EventDispatcher are in the same package, but I can't allow that (several presenters in different packages should use the EventDispatcher) any ideas?

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• Why is Django reverse() failing with unicode?

  - by JeffS

  Here is a django models file that is not working as I would expect. I would expect the to_url method to do the reverse lookup in the urls.py file, and get a url that would correspond to calling that view with arguments supplied by the Arguments model. from django.db import models class Element(models.Model): viewname = models.CharField(max_length = 200) arguments = models.ManyToManyField('Argument', null = True, blank = True ) @models.permalink def to_url(self): d = dict( self.arguments.values_list('key', 'value') ) return (self.viewname, (), d) class Argument(models.Model): key = models.CharField(max_length=200) value = models.CharField(max_length=200) The value d ends up as a dictionary from a unicode string to another unicode string, which I believe, should work fine with the reverse() method that would be called by the permalink decorator, however, it results in: TypeError: reverse() keywords must be strings

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• Why does this code fail in D2010, but not D7?

  - by Tom1952

  Why does this code get an access error on the Result := Buffer line in D2010, but not D7? Something, I'd guess, involving UniCode, but the compiler doesn't generate any warnings. Any suggestions on an elegant workaround? function GetTempPathAndFileName( const aExtension: string): string; var Buffer: array[0..MAX_PATH] of Char; begin repeat GetTempPath(SizeOf(Buffer) - 1, Buffer); GetTempFileName(Buffer, '~', 0, Buffer); Result := Buffer; // <--- crashes on this line, Result := ChangeFileExt(Result, aExtension); until not FileExists(Result); end; { GetTempPathAndFileName }

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• Fluent-NHibernate - Component property attributes ignored by Convention

  - by BobTodd

  I have a component with a number of properties that have various attributes Normally when these attributes are added to a plain old domain object they are picked up by my custom AttributeConventions. For the Component properties they are not. Is there some extra wiring needed for these? e.g. public class Component { [Length(Max=50)] public virtual string Name {get; set;} } public class MyClass { public virtual Component Component {get; set;} [Length(Max=50)] public virtual string Color {get; set;} } I get a table MyClass with columns Color & ComponentName Color is an nvarchar(50) whilst ComponentName is an nvarchar(255) (the default)

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• Parallel EntityFramework

  - by mehanik

  Is it possible to make some work in parallel with entity framework for following example? using (var dbContext = new DB()) { var res = (from c in dbContext.Customers orderby c.Name select new { c.Id, c.Name, c.Role } ).ToDictionary(c => c.Id, c => new Dictionary<string, object> { { "Name",c.Name }, { "Role", c.Role } }); } For exampe what will be changed if I add AsParrallel? using (var dbContext = new DB()) { var res = (from c in dbContext.Customers orderby c.Name select new { c.Id, c.Name, c.Role } ).AsParallel().ToDictionary(c => c.Id, c => new Dictionary<string, object> { { "Name",c.Name }, { "Role", c.Role } }); }

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• What happens when Npgsql connection pool reaches Max

  - by ClearCarbon

  Both the name of the connection string parameter and this blog post - http://fxjr.blogspot.co.uk/2010/04/npgsql-connection-pool-explained.html - lead me to believe that Npgsql wont exceed the MaxPoolSize value set in the connection string. However the docs (http://npgsql.projects.postgresql.org/docs/manual/UserManual.html) say "Max size of connection pool. Pooled connections will be disposed of when returned to the pool if the pool contains more than this number of connections. Default: 20" This suggests that the pool can actually grow larger than MaxPoolSize and it is in fact just a level at which Npgsql starts to aggressively remove connections from the pool as soon as they are returned. I've been searching to try and find an answer but I can find out exactly what happens when you reach MaxPoolSize. Anyone else know? edit: I should add we are using Npgsql 2.0.6.0 due to another dependency being supported only up to that version.

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• how to read values from the remote OPC Server

  - by Shailesh Jaiswal

  I have created one asp.net web service. In this web service I am using the web method as follows. The web service is related to the OPC ( OLE for process control) public string ReadServerItems(string ServerName) { string txt = ""; ArrayList obj = new ArrayList(); XmlServer Srv = new XmlServer("XDAGW.CS.WCF.Eval.1"); RequestOptions opt = new RequestOptions(); ReadRequestItemList iList = new ReadRequestItemList(); iList.Items = new ReadRequestItem[3]; iList.Items[0] = new ReadRequestItem(); iList.Items[0].ItemName = "ServerInfo.ConnectedClients"; iList.Items[1] = new ReadRequestItem(); iList.Items[1].ItemName = "ServerInfo.TotalGroups"; iList.Items[2] = new ReadRequestItem(); iList.Items[2].ItemName = "EventSources.Area1.Tracking"; ReplyItemList rslt; OPCError[] err; ReplyBase reply = Srv.Read(opt, iList, out rslt, out err); if ((rslt == null)) txt += err[0].Text; else { foreach (xmldanet.xmlda.ItemValue iv in rslt.Items) { txt += iv.ItemName; if (iv.ResultID == null) // success { txt += " = " + iv.Value.ToString() + "\r\n"; obj.Add(txt); } else txt += " : Error: " + iv.ResultID.Name + "\r\n"; } } return txt; } I am using the namespaces as follows using xmldanet; using xmldanet.xmlda; I have installed XMLDA.NET client component evaluation. In this there is an in built Test client which successfully reads the values of these data items from the remote OPC server. I also provides the template through which we can build the OPC based applications. In the above code I am trying to read the values of the data items but i am not able to read the values. I have applied the breakpoint. In that I can see that the condition if (iv.ResultID == null) becomes false & also there is null values in the variable rslt. Please tell me where I am doing mistake ? how should I correct my mistake ? can provide me the correct code ?

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• How can I stub out a call to super in a imported Java class in JRuby for testing

  - by Doug Chew

  I am testing Java classes with RSpec and JRuby. How can I stub out a call to super in an imported Java class in my RSpec test? For example: I have 2 Java classes: public class A{ public String foo() { return "bar"; } } public class B extends A public String foo() { // B code return super.foo(); } } I am just trying to test the code in B.foo and not the code in A.foo with JRuby. How can I stub out the call to the super class method in my RSpec test? rspec test: java_import Java::B describe B do it "should not call A.foo" do # some code to stub out A.foo b = B.new b.foo.should_not == "bar" end end I have tried including a module with a new foo method in B's class hoping that it would hit the module method first but B still makes a call to A. The inserting module technique works in Ruby but not with JRuby and imported Java classes. Any other ideas to stub out the superclass method to get my RSpec test to pass?

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• Spring validation errors not displayed

  - by Art Vandelay

  I have the following situation. I have a validator to validate my command object and set the errors on a Errors object to be displayed in my form. The validator is invoked as expected and works okay, but the errors i set on the Errors objects are not displayed, when i am sent back to my form because of the validation errors. Validator: public void validate(Object obj, Errors err) { MyCommand myCommand = (MyCommand) obj; int index = 0; for (Field field : myCommand.getFields()) { if (field.isChecked()) { if ((field.getValue() == null) || (field.getValue().equals(""))) { err.rejectValue("fields[" + index + "].value", "errors.missing"); } } index++; } if (myCommand.getLimit() < 0) { err.rejectValue("limit", "errors.invalid"); } } Command: public class MyCommand { private List<Field> fields; private int limit; //getters and setters } public class Field { private boolean checked; private String name; private String value; //getters and setters } Form: <form:form id="myForm" method="POST" action="${url}" commandName="myCommand"> <c:forEach items="${myCommand.fields}" var="field" varStatus="status"> <form:checkbox path="fields[${status.index}].checked" value="${field.checked}" /> <c:out value="${field.name}" /> <form:input path="fields[${status.index}].value" /> <form:errors path="fields[${status.index}].value" cssClass="error" /></td> <form:hidden path="fields[${status.index}].name" /> </c:forEach> <fmt:message key="label.limit" /> <form:input path="limit" /> <form:errors path="limit" cssClass="error" /> </form:form> Controller: @RequestMapping(value = REQ_MAPPING, method = RequestMethod.POST) public String onSubmit(Model model, MyCommand myCommand, BindingResult result) { // validate myCommandValidator.validate(myCommand, result); if (result.hasErrors()) { model.addAttribute("myCommand", myCommand); return VIEW; } // form is okay, do stuff and redirect } Could it be that the paths i give in the validator and tag are not correct? The validator validates a command object containing a list of objects, so that's why i give a index on the list in the command object when registering an error message (for example: "fields["+index+"]".value). Or is it that the Errors object containing the errors is not available to my view? Any help is welcome and appreciated, it might give me a hint or point me in right direction.

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• Active printer problem in Printing word document through VB.net

  - by sweety

  Hi My printer name is \\abc\First Floor A-Block its taking name \abc\First Floor A-Block on NE04:. How should i print it Private oWord As Word.Application Dim lobjDoc As Word.Document Dim strFolder as String Dim pd As New PrintDocument Dim strPrintername as String oWord = CreateObject("Word.Application") oWord.DisplayAlerts = Word.WdAlertLevel.wdAlertsNone oWord.ActivePrinter =strPrintername strFolder="D:\testdoc.prn" ' Here I am giving the printer name which is on network, But its taking name \abc\First Floor A-Block on NE04: lobjDoc = oWord.Documents.Open(CType(strFolder, Object)) lobjDoc.PageSetup.FirstPageTray = Word.WdPaperTray.wdPrinterAutomaticSheetFeed lobjDoc.PageSetup.OtherPagesTray = Word.WdPaperTray.wdPrinterAutomaticSheetFeed lobjDoc.PrintOut(Background:=False, Append:=False, OutputFileName:=strFolder, PrintToFile:=True) 'here its giving error about printer settings lobjDoc.Close(SaveChanges:=False) Is there any way to print word document with all its content through PrintDocument? thanks

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