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  • Path String Concatenation Question in C#.

    - by Nano HE
    Hello. I want to output D:\Learning\CS\Resource\Tutorial\C#LangTutorial But can't work. Compiler error error CS0165: Use of unassigned local variable 'StrPathHead Please give me some advice about how to correct my code or other better solution for my case. Thank you. static void Main(string[] args) { string path = "D:\\Learning\\CS\\Resource\\Book\\C#InDeepth"; int n = 0; string[] words = path.Split('\\'); foreach (string word in words) { string StrPathHead; string StrPath; Console.WriteLine(word); if (word == "Resource") { StrPath = StrPathHead + word + "\\Tutorial\\C#LangTutorial"; } else { StrPathHead += words[n++] + "\\"; } } }

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  • Web Crawling Sites with Javascripts or web forms

    - by Jojo
    Hello everyone, I have a webcrawler application. It successfully crawled most common and simple sites. Now i ran into some types of websites wherein HTML documents are dynamically generated through FORMS or javascripts. I believe they can be crawled and I just don't know how. Now, these websites do not show the actual HTML page. I mean if I browse that page in IE or firefox, the HTML code does not match what's actually in the IE or firefox. These sites contain textboxes, checkboxes, etc... so I believe they are what they call "Web Forms". Actually I am not much familiar with web development so correct me if I'm wrong. My question is, does anyone in similar situation as I am now and have successfully solved these types of "challenges"? Does anyone know of a certain book or article regarding web crawling? Those that pertains to these advanced type of websites? Thanks.

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  • OleDbException in my update method

    - by Hamed Norouzi
    Why do I have this error? The error message is: Syntax error in INSERT INTO statement. I want to add a record to my database, but it isn't working. Where is the problem? The code is: using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbDataAdapter DbDataAdabter = new OleDbDataAdapter(); DbDataAdabter.SelectCommand = new OleDbCommand("SELECT * FROM [Phone-Book]", connection); OleDbCommandBuilder cb = new OleDbCommandBuilder(DbDataAdabter); connection.Open(); DataRow dataRow = myDataset.Tables["salam"].NewRow(); dataRow[1] = textBox2.Text; dataRow[2] = textBox3.Text; dataRow[3] = textBox4.Text; dataRow[4] = textBox5.Text; dataRow.EndEdit(); myDataset.Tables["salam"].Rows.Add(dataRow); DbDataAdabter.Update(myDataset , "salam"); connection.Close(); connection.Dispose(); } }

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  • Does the traditional use of the controller in MVC lead to a violation of the Single Responsibility P

    - by Byron Sommardahl
    Wikipedia describes the Single Responsibility Principle this way: The Single Responsibility Principle states that every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class. All its services should be narrowly aligned with that responsibility. The traditional use of the controller in MVC seems to lead a programmer towards a violation of this principle. Take a simple guest book controller and view. The controller might have two methods/actions: 1) Index() and 2) Submit(). The Index() displays the form. The Submit() processes it. Do these two methods represent two distinct responsibilities? If so, how does Single Responsibility come in to play?

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  • Windows disassembler: looking for a tool...

    - by SigTerm
    Hello. I'm looking for a (preferably free) tool that can produce "proper" disassembly listing from a (non-.NET) windows PE file (*.exe or *.dll). Important requirement: it should be possible to run the listing through a windows assembler (nasm, masm or whatever) and get working exe again (not necessarily identical to original one, but it should behave in the same way). Intended usage is adding new subroutines into existing code, when source is not available. Ideally, tool should be able to detect function/segment boundaries, API calls, and generate proper labels for jumps (I can live without labels for loops/jumps, though, but function boundary detection would be nice), and keep program resources/segments in place. I'm already aware of IdaPRO(not free), OllyDBG (useful for in-place hacking, doesn't generate disassembly listing, AFAIK), ndisasm (output isn't suitable for assembler), dumpbin (useful, but AFAIK, output isn't suitable for assembler) and "proxy dll" technique. Ideas? Or maybe there is a book/tutorial that explains some kind of alternative approach?

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  • Using XPath to access comments a flat hierachy

    - by Sebastian
    I have a given XML document (structure can not be changed) and want to get the comments that are written above the nodes. The document looks like this: <!--Some comment here--> <attribute name="Title">Book A</attribute> <attribute name="Author"> <value>Joe Doe</value> <value>John Miller</value> </attribute> <!--Some comment here--> <attribute name="Code">1</attribute> So comments are optional, but if there is one, I want to get the comment above each attribute. Using /*/comment()[n] would give me comment n, but for n=2 I would naturally get the comment of the third attribute, so there is no connection between attributes and comments Any ideas? Thanks

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  • Program contains 2 nested loops which contain 4 if conditionals. How many paths?

    - by Student4Life
    In Roger Pressman's book, there is an example described of a program with 2 nested loops, the inner loop enclosing four if statements. The two loops can execute up to 20 times. He states that this makes about 10^14 paths. To get a number this large, it seems the paths inside the loops are multipllied by 2^40, i.e. 2^20 times 2^20 to account for all the possibilities of going through the two loops. I can't see why this factor is not just 400, i.e. 20 times 20. Can someone shed some light? It will help if you have the ppt slides and can see the program graph. Thanks.

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  • Blackberry - How to get Field Labels from PIMItem

    - by Taha
    How can we get Field Labels from PIMItem. The following code is with PIMList String label = pimList.getAttributeLabel( blackBerryContact.getAttributes(Contact.TEL, i)); But i have PIMItem. There is a method PIMItem.getPIMList() which returns null for me in the code below. THE API at http://www.blackberry.com/developers/docs/5.0.0api/index.html says "getPIMList() Gets the PIMList associated with this item." Below is sample code that i am trying to achive - // Load the address Book and allow the user to select a contact BlackBerryContactList contactList = (BlackBerryContactList) PIM.getInstance().openPIMList(PIM.CONTACT_LIST,PIM.READ_ONLY); PIMItem userSelectedContact = contactList.choose(); // Now get the Field labels for contact numbers for userSelectedContact

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  • Proper NSArray initialization for ivar data in a method

    - by Joost Schuur
    I'm new to Objective-C and iPhone development and have been using Apress' Beginning iPhone 3 Programming book as my main guide for a few weeks now. In a few cases as part of a viewDidLoad: method, ivars like a breadTypes NSArray are initialized like below, with an intermediate array defined and then ultimately set to the actual array like this: NSArray *breadArray = [[NSArray alloc] initWithObjects:@"White", @"Whole Weat", @"Rye", @"Sourdough", @"Seven Grain", nil]; self.breadTypes = breadArray; [breadArray release]; Why is it done this way, instead of simply like this: self.breadTypes = [[NSArray alloc] initWithObjects:@"White", @"Whole Weat", @"Rye", @"Sourdough", @"Seven Grain", nil]; Both seem to work when I compile and run it. Is the 2nd method above not doing proper memory management? I assume initWithObjects: returns an array with a retain count of 1 and I eventually release breadTypes again in the dealloc: method, so that wraps things up nicely. I'm guessing 'self.breadTypes = ...' copies the data to the new array, which is why the original array can be safely released, correct?

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  • Perl - What is Larry?

    - by user350571
    I was reading some Perl book and I find meant-to-be funny mentions to something named Larry. Some times it is mixed in a religious context (like "Larry multiplied the code and distributed among coders"). Since I'm not stupid, I tried to think a bit and I believe I finally got it... It's about Larry the cow from Gentoo right?. And the religious context is because cows are normally associated to religion. Anyway, why the references? There is something about camels and cows together that I'm not following?

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  • Could the assign function for containers possibly overflow?

    - by Kristo
    I ran into this question today and thought I should post it for the community's reference and/or opinions. The standard C++ containers vector, deque, list, and string provide an assign member function. There are two versions; I'm primarily interested in the one accepting an iterator range. The Josuttis book is a little ambiguous with its description. From p. 237... Assigns all elements of the range [beg,end); this is, is replaces all existing elements with copies of the elements of [beg,end). It doesn't say what happens if the size of the assignee container is different from the range being assigned. Does it truncate? Does it automagically expand? Is it undefined behavior?

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  • Ruby: Is there a better way to iterate over multiple (big) files?

    - by zxcvbnm
    Here's what I'm doing (sorry for the variable names, I'm not using those in my code): File.open("out_file_1.txt", "w") do |out_1| File.open("out_file_2.txt", "w") do |out_2| File.open_and_process("in_file_1.txt", "r") do |in_1| File.open_and_process("in_file_2.txt", "r") do |in_2| while line_1 = in_1.gets do line_2 = in_2.gets #input files have the same number of lines #process data and output to files end end end end end The open_and_process method is just to open the file and close it once it's done. It's taken from the pickaxe book. Anyway, the main problem is that the code is nested too deeply. I can't load all the files' contents into memory, so I have to iterate line by line. Is there a better way to do this? Or at least prettify it?

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  • What is the equivalent of <composite-element> in Castle ActiveRecord?

    - by Daniel T.
    I have a TrackLog that has a collection of TrackPoints: public class TrackLog { public string Name { get; set; } public ISet<TrackPoint> TrackPoints { get; set; } } public class TrackPoint { public DateTime Timestamp { get; set; } public double Latitude { get; set; } public double Longitude { get; set; } } I'd like to map the track points as a collection of components, as this makes the most sense. According to the book NHibernate in Action, on page 187: Collections of components are mapped similarily to other collections of value type instances. The only difference is the use of <composite-element> in place of the familiar <element> tag. How would I do this using Castle ActiveRecord attributes?

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  • ASP.NET-MVC2 Preview 1: Are There Any Breaking Changes?

    - by Jim G.
    I was following Steven Sanderson's 'Pro ASP.NET MVC Framework' book. On page 132, in accordance with the author's recommendation, I downloaded the ASP.NET MVC Futures assembly, and added it to my MVC project. Then, without encouragement from the author, I downloaded, installed, and incorporated the ASP.NET MVC2 Preview 1 dlls into my project. Now, I can no longer load the website. That is, when I hit F5 in Visual Studio, I get this error. In retrospect, I think it was a really bad idea to assume that ASP.NET MVC2 Preview 1 would only be additive; but I'd like other people to weigh in. Has anyone noticed any breaking changes in ASP.NET MVC 2 Preview 1? Also - Has anyone noticed any changes that impact Castle Windsor? Also, please let me know if I should be mindful of IIS6 vs. IIS7 ramifications.

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  • Procedural music generation?

    - by anon
    Anyone have good book / article recommendation for procedural generation of background music? (No vocals, just instruments). I'm not interested in: How do I generate the sound of a particular note on a particular instrument I'm interested in: How do I generate the melody / score for the music. Thanks! EDIT: Thanks for the reference to Brian Eno. I'm definitely looking into the ambient/user can ignore type of music. I.e. think the background music of a game. It's there to provide some basic mood, but the focus is the game.

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  • Groovy 1.7 changes "final"?

    - by Aaron L. Carlow
    Just started learning Groovy, got the PragProg book "Programming Groovy" and had a problem compiling one of the sample scripts: class GCar2 { final miles = 0 def getMiles() { println "getMiles called" miles } def drive(dist) { if (dist > 0) { miles += dist } } } def car = new GCar2() println "Miles: $car.miles" println 'Driving' car.drive(10) println "Miles: $car.miles" try { print 'Can I see the miles? ' car.miles = 12 } catch (groovy.lang.ReadOnlyPropertyException ex) { println ex.message GroovyCar2.groovy: 20: cannnot access final field or property outside of constructor. @ line 20, column 35. def drive(dist) { if (dist > 0) miles += dist } ^ Groovy versions prior to 1.7 do not give an error. I looked through whatever documentation I could find and did not see the issue discussed. What is going on here? Aaron

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  • EndpointNotFoundException when working through tutorials in Learning WCF

    - by Nicholas
    I am working through the book Learning WCF and on the first tutorial lab HelloIndigo I am receiving the following error. Could not connect to http://localhost:8000/HelloIndigo/HelloIndigoService. TCP error code 10061: No connection could be made because the target machine actively refused it 127.0.0.1:8000. It appears in the Client project on the line string s = proxy.HelloIndigo(); EndpointAddress ep = new EndpointAddress("http://localhost:8000/HelloIndigo/HelloIndigoService"); IHelloIndigoService proxy = ChannelFactory<IHelloIndigoService>. CreateChannel(new BasicHttpBinding(), ep); string s = proxy.HelloIndigo(); Console.WriteLine(s); Console.WriteLine("Press <ENTER> to terminate Client"); Console.ReadLine(); I have intensively googled on this but I am none the wiser. Can anyone explain the issue and how to remedy?

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  • Creating items in groups in Rails

    - by LearnRails
    My product table is id type price location 1 chips $3 aisle3 I have a question with adding the products in groups. There is a quantity field(nonmodel) where the user can enter the quantity While adding a new product if the user enters: type: soda quantity: 3 Then there 3 records should be created in product model with type= soda like the following. id type 2 soda 3 soda 4 soda If user enters location: aisle4 quantity: 2 Then id location 5 ailse4 6 ailse4 Can you tell me how to pass the nonmodel field 'quantity' to the rails(model or controller) and how use it to add the products in groups as mentioned above? or should I create a column called quantity in my product table? Will the history be updated too for all these new records with after_create filter which I already have ? Is there any good tutorial or book which shows how to pass such nonmodel html/javascript fields from view to rails and then back to the view? Any help will be greatly appreciated. Thanks

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  • NullPointerException on facebook login using servlet

    - by khoyendra
    after solve class notfound exeption i have to find error when i login in face book using given example http://code.google.com/p/facebook-java-api/wiki/Examples java.lang.NullPointerException com.google.code.facebookapi.ExtensibleClient.<init>(ExtensibleClient.java:111) com.google.code.facebookapi.ExtensibleClient.<init>(ExtensibleClient.java:99) com.google.code.facebookapi.ExtensibleClient.<init>(ExtensibleClient.java:95) com.google.code.facebookapi.FacebookXmlRestClientBase.<init>(FacebookXmlRestClientBase.java:44) com.google.code.facebookapi.FacebookXmlRestClient.<init>(FacebookXmlRestClient.java:10) FaceBookCrawl.FacebookUserFilter.doFilter(FacebookUserFilter.java:107) FaceBookCrawl.FacebookUserFilter.doPost(FacebookUserFilter.java:181) javax.servlet.http.HttpServlet.service(HttpServlet.java:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

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  • Java: confirm method Binary division and find remainder is correct?

    - by cadwag
    I am parsing binary files and have to implement a CRC algorithm to ensure the file is not corrupted. Problem is that I can't seem to get the binary math working when using larger numbers. The example I'm trying to get working: BigInteger G = new BigInteger("11001", 2); BigInteger M = new BigInteger("1110010000", 2); BigInteger R = M.remainder(G); I am expecting: R = "0101" But I am getting: R = "1100" I am assuming the remainder of 0101 is correct since it is given to me in this book I am using as a reference for the CRC algorithm (it's not based in Java), but I can't seem to get it working. I can get small binary calculations to work that I have solved by hand, but not the larger ones. I'll admit that I haven't worked the larger ones by hand yet, that is my next step, but I wanted to see if someone could point out a glaring flaw I have in my code. Can anyone confirm or deny that my methodology is correct? Thanks

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  • [as3] list cellRenderer

    - by lemon
    I'm quite new with as3 via cs4 so please bear with me. I'm trying to make a phone book type list that displays the users name, cellnumber and possible a delete button. --- Bob 09XXXXXXXXX delete --- Sussie 09XXXXXXXXX delete --- Johnny 09XXXXXXXXX delete --- I've tried making a list and added to it a XML dataprovider <profiles> <profile> <label>Bob</label> ... </profile> It'll then display a list of names Bob Sussie Johnny But what do I have to do in order to get it print like fig 1? I know that it has something to do with CellRender but I can't seem to find any decent examples in Google.

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  • Create iPhone app programmatically, in its entirety

    - by miorel
    I recently became interested in iPhone app development, so I've been looking at online tutorials, and also reading a book, trying out the examples as I go along. I'm getting better, but one of the things I still find quite annoying about the usual development model is that I really have no idea what the SDK is really doing behind the scenes to make the app "work" because Apple protects me from this. For example, when I make connections on interface builder, this presumably corresponds to code being generated somewhere... Where that code is and what it does and how it works are not obvious (to me). So I'm wondering, is it possible to create an iPhone app entirely programmatically? That is, have execution start in some main method, which will then programmatically create any views, register event listeners, etc. And if yes, what are some good resources for something like this?

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  • Resources for widget creation

    - by Kenji Crosland
    My rails app is about to go live and I'm trying to figure out how to create a widget based on data on the site. My Javascript is not too hot--limited to the O'reilly head first book on JS. I can read simple Javascript okay but when it comes to writing it I'm a little lost. That said, I hope to roll out a widget, maybe a wordpress plugin too soon after my app is launched. Does anyone know of any rails plugins, javascript templates, tutorials or books that can get me going? I did ask a similar question before here: But my limited knowledge of JS kept me from implementing the suggested answer properly.

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  • Storing DOM reference elements in a Javascript array

    - by webzide
    Dear experts, I was trying to dynamically generate DOM elements using JS. I read from Douglas Crockford's book that DOM is very very poorly structured. Anyways, I would like to create a number of DIVISION elements and store the reference into an array so it could be accessed later. Here's the code for(i=0;i<3;i++){ var div=document.body.appendChild(document.createElement("div")); var arr=new Array(); arr.push(div); } Somehow this would not work..... There is only 1 div element created. When I use the arr.length to test the code there is only 1 element in the array. Is there another way to accomplish this? Thanks in advance

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  • problem processing xml in flex3

    - by john
    Hi All, First time here asking a question and still learning on how to format things better... so sorry about the format as it does not look too well. I have started learning flex and picked up a book and tried to follow the examples in it. However, I got stuck with a problem. I have a jsp page which returns xml which basically have a list of products. I am trying to parse this xml, in other words go through products, and create Objects for each product node and store them in an ArrayCollection. The problem I believe I am having is I am not using the right way of navigating through xml. The xml that is being returned from the server looks like this: <?xml version="1.0" encoding="ISO-8859-1"?><result type="success"> <products> <product> <id>6</id> <cat>electronics</cat> <name>Plasma Television</name> <desc>65 inch screen with 1080p</desc> <price>$3000.0</price> </product> <product> <id>7</id> <cat>electronics</cat> <name>Surround Sound Stereo</name> <desc>7.1 surround sound receiver with wireless speakers</desc> <price>$1000.0</price> </product> <product> <id>8</id> <cat>appliances</cat> <name>Refrigerator</name> <desc>Bottom drawer freezer with water and ice on the door</desc> <price>$1200.0</price> </product> <product> <id>9</id> <cat>appliances</cat> <name>Dishwasher</name> <desc>Large capacity with water saver setting</desc> <price>$500.0</price> </product> <product> <id>10</id> <cat>furniture</cat> <name>Leather Sectional</name> <desc>Plush leather with room for 6 people</desc> <price>$1500.0</price> </product> </products></result> And I have flex code that tries to iterate over products like following: private function productListHandler(e:JavaFlexStoreEvent):void { productData = new ArrayCollection(); trace(JavaServiceHandler(e.currentTarget).response); for each (var item:XML in JavaServiceHandler(e.currentTarget).response..product ) { productData.addItem( { id:item.id, item:item.name, price:item.price, description:item.desc }); } } with trace, I can see the xml being returned from the server. However, I cannot get inside the loop as if the xml was empty. In other words, JavaServiceHandler(e.currentTarget).response..product must be returning nothing. Can someone please help/point out what I could be doing wrong. My JavaServiceHandler class looks like this: package com.wiley.jfib.store.data { import com.wiley.jfib.store.events.JavaFlexStoreEvent; import flash.events.Event; import flash.events.EventDispatcher; import flash.net.URLLoader; import flash.net.URLRequest; public class JavaServiceHandler extends EventDispatcher { public var serviceURL:String = ""; public var response:XML; public function JavaServiceHandler() { } public function callServer():void { if(serviceURL == "") { throw new Error("serviceURL is a required parameter"); return; } var loader:URLLoader = new URLLoader(); loader.addEventListener(Event.COMPLETE, handleResponse); loader.load(new URLRequest(serviceURL)); // var httpService:HTTPService = new HTTPService(); // httpService.url = serviceURL; // httpService.resultFormat = "e4x"; // httpService.addEventListener(Event.COMPLETE, handleResponse); // httpService.send(); } private function handleResponse(e:Event):void { var loader:URLLoader = URLLoader(e.currentTarget); response = XML(loader.data); dispatchEvent(new JavaFlexStoreEvent(JavaFlexStoreEvent.DATA_LOADED) ); // var httpService:HTTPService = HTTPService(e.currentTarget); // response = httpService.lastResult.product; // dispatchEvent(new JavaFlexStoreEvent(JavaFlexStoreEvent.DATA_LOADED) ); } } } Even though I refer to this as mine and it is not in reality. This is from a Flex book as a code sample which does not work, go figure. Any help is appreciated. Thanks john

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