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  • RAII: Initializing data member in const method

    - by Thomas Matthews
    In RAII, resources are not initialized until they are accessed. However, many access methods are declared constant. I need to call a mutable (non-const) function to initialize a data member. Example: Loading from a data base struct MyClass { int get_value(void) const; private: void load_from_database(void); // Loads the data member from database. int m_value; }; int MyClass :: get_value(void) const { static bool value_initialized(false); if (!value_initialized) { // The compiler complains about this call because // the method is non-const and called from a const // method. load_from_database(); } return m_value; } My primitive solution is to declare the data member as mutable. I would rather not do this, because it suggests that other methods can change the member. How would I cast the load_from_database() statement to get rid of the compiler errors?

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  • java best way to transfer images

    - by d.raev
    I have a application that reads a PDF, transform the content to collection of TIF files, and send them to Glass Fish Server for saving. Usually there are 1-5 pages and it works nice, but when I got a input file with 100+ pages... it throws error on the transfer. Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94) Putting more resources is not a good option in my case, so I m looking for a way to optimize it somehow. I store the data in: HashMap<TifProfile, List<byte[]> Is there a better way to store or send them ? EDIT I did some tests and the final collections for PDF with 80 pages has size over 280mb (240 tiffs with different settings inside)

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  • How to update user info with restful_authentication plugin in Rails?

    - by benoror
    Hi people, I want to give the users to change their account info with restful_authentication plugin in rails. I added this two methods to my controller: def edit @user = User.find(params[:id]) end def update @user = User.find(params[:id]) # Only update password when necessary params[:user].delete(:password) if pàrams[:user][:password].blank? respond_to do |format| if @user.update_attributes(params[:user]) flash[:notice] = 'User was successfully updated.' format.html { redirect_to(@user) } format.xml { head :ok } else format.html { render :action => "edit" } format.xml { render :xml => @user.errors, :status => :unprocessable_entity } end end end Also, I copied new.html.erb to edit.html.erb. Considering that resources are already defined in routes.rb I was expecting it to work easily, bute somehow when I click the save button it calls the create method, instead of update, using a POST http request. Any ideas?

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  • Problem with Eclipse and a Maven multi-module project

    - by earth
    I have created a Maven project with the following structure: + root-project pom.xml (pom) + sub-projectA (jar) + sub-projectB (jar) I have done the following steps: mvn archetype:create –DgroupId=my.group.id –DartifactId=root-project mvn archetype:create –DgroupId=my.group.id –DartifactId=sub-projectA mvn archetype:create –DgroupId=my.group.id –DartifactId=sub-projectB So I have, obviously, in the top-level pom.xml the following elements: <modules> <module>sub-projectA</module> <module>sub-projectB</module> </modules> The last step was: mvn eclipse:clean eclipse:eclipse Now if I import the root-project in Eclipse, it seems to look at my projects as resources and not like java projects. However if I import each of child projects sub-projectA and sub-projectB, it looks them like java projects. This is a big problem for me because I have a deeper hierarchy. Any help would be appreciated!

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  • why java application not working after applying "web look and feel" theme?

    - by Vasu
    I have developed "Employee Management System" java project .For improving the ui appearance i have integrated "web look and feel" into my application.Theme is applied correctly. But here the problem arises: At first i have runned the java application without connecting to oracle data base,application have runned and worked perfectly. But when i connected the application to oracle database and runned again the application is taking more time to open and getting strucked. Code: For applying theme try { WebLookAndFeel.install(); }catch(Exception ex){ ex.printStackTrace(); } Code for Connecting DataBase: if (con == null) { File sd = new File(""); File in = new File(sd.getAbsolutePath() + File.separator + "conf.properties"); File dir = new File(sd.getAbsolutePath() + File.separator + "conf.properties"); if (!dir.exists()) { // dir.mkdir(); dir.createNewFile(); Properties pro = new Properties(); pro.load(new FileInputStream(in)); pro.setProperty("driverclass", "oracle.jdbc.driver.OracleDriver"); pro.setProperty("url", "jdbc:oracle:thin:@192.168.1.1:1521:main"); pro.setProperty("username", "gb16"); pro.setProperty("passwd", "gb16"); try { FileOutputStream out = new FileOutputStream(in); pro.store(out, "Human Management System initialization properties"); out.flush(); out.close();} catch(Exception e) { e.printStackTrace(); } } else { // System.out.println("Already exists "); } Properties pro = new Properties(); pro.load(new FileInputStream(in)); Class.forName(pro.getProperty("driverclass")); con = DriverManager.getConnection(pro.getProperty("url"), pro.getProperty("username"), pro.getProperty("passwd")); st = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); st = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); } else { return con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); } without the theme the application with connected to database working correctly. Please help me in solving this issue. Thanks in advance..

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  • Where can I find up-to-date information / walkthroughs on VS 2010 deployment?

    - by Kohan
    I am looking for information on deploying my web app to our test server. Having heard Hanselman say this is something you can do within VS 2010 easily I set out too find information on exactly how to do this but can not seem to find anything. Ignoring the fact that most of the blog posts / articles are over a year old, there just seems to be no clear step by step information on how to do this. Has anyone found the light? where did you learn this information? Best resources i have found so far:- http://blogs.msdn.com/b/webdevtools/archive/2009/02/04/web-deployment-with-vs-2010-and-iis.aspx http://blogs.msdn.com/b/webdevtools/archive/2009/03/10/how-does-web-deployment-with-vs10-and-msdeploy-work.aspx Many thanks, Kohan

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  • writing XML with Xerces 3.0.1 and C++ on windows

    - by Jon
    Hi, i have the following function i wrote to create an XML file using Xerces 3.0.1, if i call this function with a filePath of "foo.xml" or "../foo.xml" it works great, but if i pass in "c:/foo.xml" then i get an exception on this line XMLFormatTarget *formatTarget = new LocalFileFormatTarget(targetPath); can someone explain why my code works for relative paths, but not absolute paths please? many thanks. const int ABSOLUTE_PATH_FILENAME_PREFIX_SIZE = 9; void OutputXML(xercesc::DOMDocument* pmyDOMDocument, std::string filePath) { //Return the first registered implementation that has the desired features. In this case, we are after a DOM implementation that has the LS feature... or Load/Save. DOMImplementation *implementation = DOMImplementationRegistry::getDOMImplementation(L"LS"); // Create a DOMLSSerializer which is used to serialize a DOM tree into an XML document. DOMLSSerializer *serializer = ((DOMImplementationLS*)implementation)->createLSSerializer(); // Make the output more human readable by inserting line feeds. if (serializer->getDomConfig()->canSetParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true)) serializer->getDomConfig()->setParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true); // The end-of-line sequence of characters to be used in the XML being written out. serializer->setNewLine(XMLString::transcode("\r\n")); // Convert the path into Xerces compatible XMLCh*. XMLCh *tempFilePath = XMLString::transcode(filePath.c_str()); // Calculate the length of the string. const int pathLen = XMLString::stringLen(tempFilePath); // Allocate memory for a Xerces string sufficent to hold the path. XMLCh *targetPath = (XMLCh*)XMLPlatformUtils::fgMemoryManager->allocate((pathLen + ABSOLUTE_PATH_FILENAME_PREFIX_SIZE) * sizeof(XMLCh)); // Fixes a platform dependent absolute path filename to standard URI form. XMLString::fixURI(tempFilePath, targetPath); // Specify the target for the XML output. XMLFormatTarget *formatTarget = new LocalFileFormatTarget(targetPath); //XMLFormatTarget *myFormTarget = new StdOutFormatTarget(); // Create a new empty output destination object. DOMLSOutput *output = ((DOMImplementationLS*)implementation)->createLSOutput(); // Set the stream to our target. output->setByteStream(formatTarget); // Write the serialized output to the destination. serializer->write(pmyDOMDocument, output); // Cleanup. serializer->release(); XMLString::release(&tempFilePath); delete formatTarget; output->release(); }

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  • Ruby on Rails controller-view refactoring

    - by Dimitar Vouldjeff
    Hello, In my app I am using the ym4r-gm plugin, which allows you to play with the Google Maps API... I put the map "setup" in the controller: @map = GMap.new("div_map") @map.control_init(:large_map => true, :map_type => true) @map.center_zoom_init([47.0, 26.0], 7) ... And only render @map in the view. So my first question is whether I am using the right approach of "diving" this code? And the second question is: I have to models, which are rendering the same map (only the resources are different). Where should I put my refactored method that renders the map? In the application controller, maybe? Thanks in advance, I hope you will understand me!

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  • How do you handle live video streaming in Flash AS3?

    - by CodeJustin.com
    I've been dabbling with socket servers in Java and now I'm ready to get my feet wet with an idea I had. I would like to use python for my socket server and obviously AS3 for my client. I'm able to create a full chat using my own python socket server but I'm almost clueless what to do now that I want to add in LIVE video (want to make it a live video "chat"). I've found tutorials but they are for FMS and I can not afford that, also Red5 looked nice but couldn't find a live video tutorial off hand (plus I would have to switch to Red5 from my own socket server). So if someone could even nudge me into some resources on the subject (the subject of live video without using FMS) that would be very helpful, Google is failing me right now.

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  • Concatenate String to Evernote Markup Language (ENML) in python

    - by Adam the Mediocre
    I am looking to add a string containing the user's text input to the note.content of my note. After reading, I have found how to add resources, but I don't want the resource to be an attachment, I want it to be the actual text. Here is some of the code: title= self.textEditTitle.text() body= self.textEditBody.text() auth_token = "secret stuff!" client = EvernoteClient(token=auth_token, sandbox=True) note_store = client.get_note_store() nBody = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" nBody += "<!DOCTYPE en-note SYSTEM \"http://xml.evernote.com/pub/enml2.dtd\">" nBody += "<en-note>%s</en-note>" % body note = Types.Note() note.title = title note.content= nBody Any advice would be great, as I'm just starting out with this api and it looks like it's full of potential once I figure it out! Here is what I have been mostly reading from: http://dev.evernote.com/documentation/cloud/chapters/ENML.php

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  • Is it possible to prevent a locally-running SWF (AS3) from downloading from my website?

    - by Matt
    I've got a crossdomain.xml file which allows SWFs running on only a certain few domains to download resources from my domain. However, one simple way around this is for a user to download the SWF to their local machine, and run it there (i.e. by double-clicking on it within Windows Explorer, not by running through http://localhost). It seems that when this happens, the crossdomain.xml file is ignored. I understand that in my actionscript, I can do this: if (Security.sandboxType.indexOf(Security.REMOTE) == -1) // running locally - don't allow However it is incredibly easy for someone to decompile the SWF and simply remove this line. Is it possible to do something on the server side to stop a locally running SWF to download from my site? I tried checking the referrer but this field often isn't populated. Does anyone have any other ideas? Thanks, Matt

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  • long running process in asp.net C#

    - by user339323
    Hello All, I have a web application that has a long running (resource intensive) process in the code behind and the end output is a pdf file (images to pdf conversion tool) It runs fine..and since I am on a dedicated server, it is not at all a problem with respect to resources right now. However, I wonder that the system would reach its resource limits if, there are more than 20 users processing at a time. I have seen services online where the user enters their email and the processes are, I suppose, queued in the background and the results emailed with the 1st in 1st out method. Can someone please give me a start on how to implement this kind of logic in asp.net applications using C#? Thanks a lot in advance, Prasad.

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  • How to programmatically generate WSDL from WCF service (Integration Testing)

    - by David Christiansen
    Hi All, I am looking to write some integration tests to compare the WSDL generated by WCF services against previous (and published) versions. This is to ensure the service contracts don't differ from time of release. I would like my tests to be self contained and not rely on any external resources such as hosting on IIS. I am thinking that I could recreate my IIS hosting environment within the test with something like... using (ServiceHost host = new ServiceHost(typeof(NSTest.HelloNS), new Uri("http://localhost:8000/Omega"))) { host.AddServiceEndpoint(typeof(NSTest.IMy_NS), new BasicHttpBinding(), "Primary"); ServiceMetadataBehavior behavior = new ServiceMetadataBehavior(); behavior.HttpGetEnabled = true; host.Description.Behaviors.Add(behavior); host.AddServiceEndpoint(typeof(IMetadataExchange), MetadataExchangeBindings.CreateMexHttpBinding(), "mex"); host.Open(); } Does anyone else have any better ideas?

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  • Sharing variable within different javascript file at client side

    - by Aman
    I was actually going through this link. which explains how we can share global variable across multiple js. but the point is what need to be done if I am getting some variable into one js and need to pass to another one mentioned in same document after the 1st one. approach which followed was: Script 1 <script type="text/javascript" src="js/client.js"></script> body added some hidden input with id myHiddenId, where values are set using client.js Script 2 <script type="text/javascript" src="js/anotherJS.js"></script> inside script 2 I am simply using $("#myHiddenId").val(); and using for my purpose. I want to know whether I am following correct approach, because that hidden field may have some data which client should not get aware of. is there any other way through which I can pass the variable values across the js files ? Since I am at beginner level hence digging up some resources/books but still no luck.

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  • Validate data before uploading through SSIS

    - by The King
    I have a SSIS package to upload data from Excel file into an Sql Server 2005 table. The excel file will have varied lines of data ranging from 20k - 30k lines. The upload works fine, when all the data are correct. But obviously fails when there is a small problem even in a single row. Examples like mandatory values presented null, inconvertable values (data type mismatch) etc. I want to validate the excel file before the upload and want to tell the user which row and column has got the error... Any idea as to how to accomplish this, without consuming much time and resources. Thanks

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  • Where to handle fatal exceptions

    - by Stephen Swensen
    I am considering a design where all fatal exceptions will be handled using a custom UncaughtExceptionHandler in a Swing application. This will include unanticipated RuntimeExceptions but also custom exceptions which are thrown when critical resources are unavailable or otherwise fail (e.g. a settings file not found, or a server communication error). The UncaughtExceptionHandler will do different things depending on the specific custom exception (and one thing for all the unanticipated), but in all cases the application will show the user an error message and exit. The alternative would be to keep the UncaughtExceptionHandler for all unanticipated exceptions, but handle all other fatal scenarios close to their origin. Is the design I'm considering sound, or should I use the alternative?

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  • suggestions for someone studying for java certification

    - by newguy
    I have been working with java (J2EE) for about 4 years. I have been putting off the certification for a while now. I bought the exam last year and still have not taken the exam. it expires in june so I am going to give it a shot. I know certifications don't get jobs but interviews but where I work...certification will put a 'stamp' on my resume and I think it'll popout in the eyes of the management. Anyways, I am going for JAVA 6. Can someone suggest some good mock exams that are kind of new and relevant. I came across this link but most of these exams are fairly old. I am using kathy Sierra's book for studying. Any other resources/pointers?

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  • How do I programmatically set property of control in aspx file ?

    - by Thomas Wanner
    This may be a very dumb question but I can't seem to get it working. I use at many places the following syntax for dynamically binding a property of a control in aspx file to the resource entry, e.g. <SomeFunnyControl Text="<%$ Resources : ResClass, ResEntry %>" /> I want to do a similar thing with a class containing some constants, something like <SomeFunnyControl Text="<%= MyConstantsClass.MyStringConstant %>" /> But this doesn't seem to work, it simply sets the text to the exact expression without evaluating it. I am using ASP.NET 3.5 btw. I have tried the databinding approach but I get an HttpParseException saying Databinding expressions are only supported on objects that have a DataBinding event.

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  • Work flow for authentication and API use with Twitter on OAuth

    - by Gustavo Carreno
    I'm a bit confused about all this OAuth bruhaha in the sense that all the examples I can find are for web applications and none of them for desktop applications. I understand the Web application work flow, but that includes some redirections between the web app and twitter. How does one do this in an desktop application? How does the redirects work? Should I have to include a Web Browser object? Is there a way to go around this? Could anyone point me to resources instead of a full blown solution please? Thanks

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  • What Visual C++ references are worth a look for a Java programmer looking to get up to speed?

    - by Terry V.
    I have a lot of experience with Java/OO. There are tons of C++ tutorials/references out there, but I was wondering if there are a few key ones that a Java programmer might find useful when making the transition. I will be moving from server-side J2EE to Windows Visual C++ desktop programming. I have googled and found tons of resources, but am overwhelmed and don't know where to best spend my time. I have only a few days to get a good start. Is Visual Studio Express / Microsoft Visual C++ the best IDE for me to start with? Also, any words of wisdom from others who know and work with both languages?

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  • Efficiency of the .NET garbage collector

    - by Jonas B
    OK here's the deal. There are some people who put their lives in the hands of .NET's garbage collector and some who simply wont trust it. I am one of those who partially trusts it, as long as it's not extremely performance critical (I know I know.. performance critical + .net not the favored combination), in which case I prefer to manually dispose of my objects and resources. What I am asking is if there are any facts as to how efficient or inefficient performance-wise the garbage collector really is? Please don't share any personal opinions or likely-assumptions-based-on-experience, I want unbiased facts. I also don't want any pro/con discussions because it won't answer the question. Thanks

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  • Using image resource in XAML markup?

    - by Jeff Dahmer
    I'm trying to add little icons to my tabs in WPF but having trouble with how to set up the binding. <TabItem.Header> <StackPanel Orientation="Horizontal"> <Image Source="{Binding Source=prop:Resources.eye}" /> <Label VerticalAlignment="Center">Header</Label> </StackPanel> </TabItem.Header> The xmlns:prop is set up for the local project's Properties, I am pulling other values from it elsewhere so I know that the namespace works. The markup above compiles fine BUT I don't see the eye image in the tab. Also, is there any way to set this up into a template? I'm fairly new to XAML/WPF and each tab will have its own image...

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  • Select a data template by item type programatically in WPF

    - by Michael Stoll
    Hi all, unfortunately the WPF ToolbarTray does not support binding to a collection of ToolbarViewModels (Correct me, if I'm wrong). Thus I want to create the Toolbars programmatically. So there are two tasks, which I don't know how to do: Select the data template based on the item type. Instantiate the data template as toolbar Both should do the same as WPF does, when we use ItemsControl with an enumerable content and empty template. I used reflector to anaylse what WPF does. Task 1 is done by FrameworkElement.FindTemplateResourceInternal, but this is internal, and I couldn't find any public methods to acomplish the task. Of course one could enumerate all resources and match the data template data type property, but this seems sub-optimal. Who know's how to acomplish these tasks?

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  • New/strange Java "try()" syntax?

    - by Ali
    While messing around with the custom formatting options in Eclipse, in one of the sample pieces of code, I say code as follows: /** * 'try-with-resources' */ class Example { void foo() { try (FileReader reader1 = new FileReader("file1"); FileReader reader2 = new FileReader("file2")) { } } } I've never seen try used like this and I've been coding in Java for 9 years! Does any one know why you would do this? What is a possible use-case / benefit of doing this? An other pieces of code I saw, I thought was a very useful shorthand so I'm sharing it here as well, it's pretty obvious what it does: /** * 'multi-catch' */ class Example { void foo() { try { } catch (IllegalArgumentException | NullPointerException | ClassCastException e) { e.printStackTrace(); } } }

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  • Understanding top output in Linux

    - by Rayne
    Hi, I'm trying to determine the CPU usage of a program by looking at the output from Top in Linux. I understand that %us means userspace and %sy means system/kernel etc. But say I see 100%us. Does this mean that the CPU is really only doing useful work? What if a CPU is tied up waiting for resources that are not avaliable, or cache misses, would it also show up in the %us column, or any other column? Thank you.

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