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  • How can I do block-oriented disk I/O with Java? Or similar for a B+ tree

    - by Sanoj
    I would like to implement an B+ tree in Java and try to optimize it for disk based I/O. Is there an API for accessing individual disk blocks from Java? or is there an API that can do similar block-oriented access that fits my purpose? I would like to create something like Tokyo Cabinet in 100% Java. Is there anyone that knows what Java only databases like JavaDB is using in the back-end for this? I know that there are probably other languages than Java that can do this better, but I do this in a learning purpose only.

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  • How to set the MaxReceivedMessageSize programatically when using a WCF Client?

    - by Pratt
    I want to set the MaxReceivedMessageSize property to some higher limit (Due to (400) Bad Request error) in my client programatically. This is the code I am using... WCFServiceTestClient wcfClient = new WCFServiceTestClient(new wsHttpBinding(), strServiceURL); My service url is dynamic and hence cannot use the web.config. //The following code doesnt seem to take effect ((WSHttpBinding)wcfClient.ChannelFactory.Endpoint.Binding) .MaxReceivedMessageSize = 2147483647; What am I doing wrong? Any help is appreciated. Thanks Pratt

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  • is it better to use a "natural" language to write code?

    - by M.H
    I recently saw a programming language called supernova and they said in the web page : The Supernova Programming language is a modern scripting language and the First one presents the concept of programming with direct Fiction Description using Clear subset of pure Human Language. and you can write code like: i want window and the window title is Hello World. i want button and button caption is Close. and button name is btn1. btn1 mouse click. instructions are you close window end of instructions my question is not about the language itself but it is that are we need such languages and did they make writing code easier or not?

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  • Need help in using Eclipse JEE version to develop a servlet project

    - by michael
    Hi, I have downloaded eclipse jee version (3.5) and I would like to use it to develop a servlet project on tomcat. So I * install tomcat and add it as my server in my eclipse environment. * create a Dynamic Web Project called 'TestServlet' * create a new servlet called 'MainServlet' and then I deploy my project to the tomcat server via eclipse and 'run the server in debug' mode. But when I use the browser to hit 'http://localhost:8080/TestServlet/MainServlet' I see no resource found (that page is generated by Tomcat, so I know my Tomcat is running). Can you please tell me what am I missing? Or how can I trouble shoot my problem? I think it must be some path /name is not set correctly.

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  • Implementation communication protocols in C/C++

    - by MeThinks
    I am in the process of starting to implement some proprietary communication protocol stack in software but not sure where to start. It is the kind of work I have not done before and I am looking for help in terms of resources for best/recommended approaches. I will be using c/c++ and I am free to use use libraries (BSD/BOOST/Apache) but no GPL. I have used C++ extensively so using the features of C++ is not a problem. The protocol stack has three layers and it is already fully specified and formally verified. So all I need to do is implemented and test it fully in the specified languages. Should also mention that protocol is very simple but can run on different devices over a reliable physical transport layer Any help with references/recommendations will be appreciated. I am willing to use a different language if only to help me understand how to implement them but I will have to eventually resort to the language of choice.

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  • Why are forward declarations necessary?

    - by user199421
    In languages like C# and Java there is no need to declare (for example) a class before using it. If I understand it correctly this is because the compiler does two passes on the code. In the first it just "collects the information available" and in the second one it checks that the code is correct. In C and C++ the compiler does only one pass so everything needs to be available at that time. So my question basically is why isn't it done this way in C and C++. Wouldn't it eliminate the needs for header files?

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  • [JQuery] Highlight a Radio field and then pop up an input text box field

    - by kwokwai
    Hi all, I am trying to make some dynamic effect to a HTML page using JQuery. 1. When the user clicks a Radio feild, the field will be highlighted. 2. When the user clicks the Radio 'Man', a Input text box will be provided immeditely just below it. Here is my simple HTML page, but I don't know how to do with the JQuery part: <Table> <TR> <TD>Gender</TD> <TD> Man: <INPUT type=radio name="gender" value="M"><Br/> Woman: <INPUT type=radio name="gender" value="F"> </TD> </TR> <?Table>

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  • Jquery UI Sortable Item Contents

    - by bluedaniel
    So I have this shopping list coded in php and js: http://www.whatcouldicook.com/recipes/planner So people can add, delete or sort the list and thats fine, I dont want multiple lists and instead just have a list item containing a heading tag to represent a new list. All this works and then using serialize I can save the ordering/modifying of the list. I don't know how to get the list contents however as these will be dynamic from the user. All the code is on that url so hopefully you can examine the code there. Thanks everyone

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  • Licensing Scripts

    - by Mr.K
    Hi, I've had my first nightmare client recently who was messing me around with payment for a project. So... I've come to an agreement with another client to use some of the sites scripting to build a site for them. But, now the original client wants their site too. I have made a deal to licence the reused parts of the site (some jQuery scripts and a dynamic flash gallery) rather than me signing over full copyright. However, I haven't got a clue how to do this. Can anyone point me in the right direction to read up on this? Thanks

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  • Parsing/executing C# code in C++ (on Linux)?

    - by Stick it to THE MAN
    I want to be able to add scripting functionality to my application. One of the language bindings I am considering is C# (and possibly VB.Net). The challenge is this: My application is developed in C++ My application runs on Linux I am aware of Mono, but I dont know (as yet), what is required to allow my C++ appliaction (running on linux), to be scriptable with .Net languages. Is this feasible? Am I crazy for even thinking of doing this? If I'm not crazy, can anyone provide some guidelines on how to go about implementing this? Help, tips, ideas, suggestions anyone?

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  • What is the most mature library to render equirectangular images in Flash?

    - by Dave Viner
    I have a series of equirectangular images. I'd like to display them in a custom Flash player so that the user could see the spherical nature of the images, and "look up", "look down", "look left/right" (or pan, zoom, etc). (Note that I have a long series of images, so the library must allow for dynamic loading of the images themselves, rather than having the images "baked" into the SWF player.) What is the best library to manage the display of the equirectangular images in Flash? By "best", I mean the most mature, most reliable, most robust, and fastest performing. For reference, an example of an equirectangular image can be found at http://archive.bigben.id.au/tutorials/360/background/projections.html.

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  • Drop Down Box (select) set URL on postback?

    - by jamone
    I have a page with a ASP.NET DropDownBox control (HTML select) that's populated with some dynamic record values. When the user selects a record the entire contents of the page is updated to reflect the selection. If a user clicks a link and leaves the page and tries to go back, it pulls up the default unselected list, and they have to reselect it again. How would be the best way to retain their selection? I currently have the page set so if the url contains PageName.aspx?recordID=5 it will select the correct dropDown option. However I'm not sure how to change the URL's query string based on the selection.

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  • Does anyone actually use the phrase DHTML anymore?

    - by lafoaug
    I'm not sure if this is exactly appropriate but I have what I think is a interesting question. Does anyone actually use the phrase DHTML anymore in a professional environment? I came across the the word the other day for the first time in years and shuddered at the thought of it. To me the acronym Dynamic HTML just sounds so 1999, it brings me back to the days when I first discovered programming and web development and thought it was awesome to have scripts which modified the status bar and made things fly around the page. I for one have never used the phrase recently and would never dream of saying it in a professional environment to clients or colleges as I feel there is an amateur and dated stigma attached to it. What are your thoughts?

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  • Has anybody managed to teach themself strong OOP skills through mainly developing with JavaScript?

    - by yaya3
    I am trying to do this, I'm a full time front-end dev and am aware that I am struglling to achieve this. When I am referring to OOP skills I am referring to understanding and being familiar with concepts like inheritance, polymorphism, encapsulation, abstaction. I am aware that it may be more likely to achieve what I'm after by focusing on another language in my spare time. This is the plan, but I'd be really intrigued to hear if anybody has managed to achieve this purely through JavaScript and how you did it. It'd be even better to hear from strong OOP developers from who use different programming languages to know if they have worked with developers who have managed to achieve this.

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  • how to find datakeys in oncheckedchanged event ?

    - by subodh
    <asp:Panel ID="pnlFocusAreaPanel" runat="server" GroupingText="Focus Area" Width="800"> <table cellspacing="0" cellpadding="0" width="750"> <tr> <td> <asp:GridView ID="dgFocusAreaDetails" runat="server" Width="100%" CssClass="dgStyle" AutoGenerateColumns="False" BorderColor="Silver" BorderWidth="1px" CellPadding="0" ShowHeader="False" OnSelectedIndexChanged="dgFocusAreaDetails_SelectedIndexChanged" DataKeyNames="PK_ID"> <FooterStyle Font-Underline="True" HorizontalAlign="Center" VerticalAlign="Middle"> </FooterStyle> <Columns> <asp:TemplateField HeaderText="Focus Area" HeaderStyle-BackColor="Silver"> <ItemStyle Width="90%" /> <ItemTemplate> <asp:Label runat="server" ID="lblFocusArea" Text='<%# DataBinder.Eval(Container.DataItem, "FOCUS_AREA_NAME").ToString()%>'> </asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Is Current Valid" HeaderStyle-BackColor="Silver"> <ItemStyle Width="10%" HorizontalAlign="Center" /> <ItemTemplate> <asp:CheckBox ID="chkFocusArea" runat="server" OnCheckedChanged="OnCheckChangedEvent" AutoPostBack="true" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </td> </tr> <tr> <td align="left"> <asp:TextBox ID="txtFocusArea" runat="server" Width="300px" CausesValidation="true" CssClass="txtStyle" ValidationGroup="focusArea"> </asp:TextBox> <cc1:TextBoxWatermarkExtender ID="txtFocusAreaWaterMark" runat="server" TargetControlID="txtFocusArea" WatermarkText="Add Focus Area" WatermarkCssClass="WaterMarkStyle"> </cc1:TextBoxWatermarkExtender> <asp:Button ID="btnAddFocusArea" runat="server" Text="AddFocusArea" CssClass="btnStyle" OnClick="btnAddFocusArea_Click" CausesValidation="true" ValidationGroup="focusArea" /> <asp:RequiredFieldValidator ID="reqtxtFocusArea" runat="server" ControlToValidate="txtFocusArea" ErrorMessage="Please enter focus area" Display="Dynamic" ValidationGroup="focusArea"> </asp:RequiredFieldValidator> <asp:RegularExpressionValidator ID="regexFocusArea" runat="server" ErrorMessage="Invalid characters(<,>,#)" ControlToValidate="txtFocusArea" ValidationExpression="^([^&lt;#&gt;]*)$" ValidationGroup="focusArea" Display="Dynamic" SetFocusOnError="true"> </asp:RegularExpressionValidator> </td> </tr> </table> </asp:Panel> and in code behind protected void btnAddFocusArea_Click(object sender, EventArgs e) { string strFocusArea = txtFocusArea.Text; OleDbConnection myConnection = new OleDbConnection(ConfigurationSettings.AppSettings["SQLConnectionString"]); if (strFocusArea == string.Empty || strFocusArea == txtFocusAreaWaterMark.WatermarkText) { lblError.Text = "Focus area is not entered"; } else { string insertQuery = "INSERT INTO LK_CODECAT_FOCUS_AREA(FOCUS_AREA_NAME,FK_ADDED_BY,ADDED_ON) "+ " VALUES('" + strFocusArea + "', "+Session["UserID"] +", GETDATE())"; try { myConnection.Open(); OleDbCommand myCommandToInsert = new OleDbCommand(insertQuery, myConnection); myCommandToInsert.ExecuteNonQuery(); } catch(Exception exc) { ExceptionLogger.LogException(exc); } finally { if (myConnection != null) { myConnection.Close(); } } PopulateFocusArea(); } txtFocusArea.Text = txtFocusAreaWaterMark.WatermarkText; } private void PopulateFocusArea() { OleDbConnection myConnection = new OleDbConnection(ConfigurationSettings.AppSettings["SQLConnectionString"]); string selectQuery = "SELECT PK_ID, FOCUS_AREA_NAME, IS_CURRENT_FOCUS FROM LK_CODECAT_FOCUS_AREA LKCFA ORDER BY FOCUS_AREA_NAME"; if (Session["RoleID"].ToString() == "1" || ((Session["WorkID"].ToString() != "9") || (Session["WorkID2"].ToString() != "9") || (Session["WorkID3"].ToString() != "9"))) { try { myConnection.Open(); OleDbCommand myCommandFocusArea = new OleDbCommand(selectQuery, myConnection); OleDbDataAdapter myAdapter = new OleDbDataAdapter(myCommandFocusArea); DataSet ds = new DataSet(); myAdapter.Fill(ds); dgFocusAreaDetails.DataSource = ds; dgFocusAreaDetails.ShowHeader = true; dgFocusAreaDetails.DataBind(); } catch (Exception exc) { ExceptionLogger.LogException(exc); } finally { if (myConnection != null) { myConnection.Close(); } } } } protected void dgFocusAreaDetails_SelectedIndexChanged(object sender, EventArgs e) { string selectedCategory = dgFocusAreaDetails.SelectedRow.Cells[1].Text; int index = dgFocusAreaDetails.SelectedIndex; lblError.Text = dgFocusAreaDetails.DataKeys[index].Value.ToString(); } public void OnCheckChangedEvent(object sender, EventArgs e) { CheckBox chk = (CheckBox)sender; string chkfocusarea = ((Control)chk).ID; //string focusAreaDetails = dgFocusAreaDetails.SelectedRow.Cells[0].Text; int index =Convert.ToInt32(dgFocusAreaDetails.SelectedIndex); if (chk.Checked) { string updateQuery = "UPDATE [LK_CODECAT_FOCUS_AREA] SET [IS_CURRENT_FOCUS] = 1 WHERE PK_ID = " +Convert.ToInt32( dgFocusAreaDetails.DataKeys[index].Value)+" "; } else { lblError.Text = "unchecked"; } } i want to know how i find the datakeyvalue on checked event.

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  • On Memory Allocation and C++

    - by Arpan
    And I quote from MSDN http://msdn.microsoft.com/en-us/library/aa366533(VS.85).aspx: The malloc function has the disadvantage of being run-time dependent. The new operator has the disadvantage of being compiler dependent and language dependent. Now the questions folks: a) What do we mean that malloc is run-time dependent? What kind of dynamic memory allocation functions can be independent of run-time? This statement sounds real strange. b) new is language dependent? Of course it should be right? Are HeapAlloc, LocalAlloc etc language independent? c) From a pure performance perspective are the MSVC provided routines preferable? Arpan

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  • clearcase option for view movement from one host path to another

    - by wrapperm
    Hi all, I have created a clearcase dynamic view for my development by name "view1". I have mistakenly selected the view storage location as a local PC in my network, that was made sharable by the PC owner. I was suppose to select the view storage location to be a server. Now, the issue is that I have done lot of development with the view that I have created and have plenty of view DO's and view private files in it. So I'm ruling out the option of deleting the view from the PC local storage (host path) and then creating another view in the server with the same config spec. Please, let me know if there is any method of editing the view properties (or doing something else) by which I could be able to move the view to the server (with all the DO's and view private files retained) Thanks in advance, Rahamath

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  • Linux binary built for 2.0 kernel wouldn't execute on 2.6.x kernel.

    - by lorin
    I was installing a binary Linux application on Ubuntu 9.10 x86_64. The app shipped with an old version of gzip (1.2.4), that was compiled for a much older kernel: $ file gzip gzip: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.0, stripped I wasn't able to execute this program. If I tried, this happened: $ ./gzip -bash: ./gzip: No such file or directory ldd was similarly unhappy with this binary: $ ldd gzip not a dynamic executable This isn't a showstopper for me, since my installation has a working version of gzip I can use. But I'm curious: What's the most likely source of this problem? A corrupted file? Or a binary incompatibility due to being built for a much older {kernel,libc,...}?

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  • Advice for building a browser-based audio mixer up to 32 tracks

    - by Jonathan P.
    As a personal hobby I am looking to build an online audio mixer where I can upload individual instrument tracks, control individual volumes of each track, and export the mixed down version. I've been trying (and have come pretty close) with javascript. I really would like to stay away from flash if possible, but I'm really looking for suggestions for technologies to try. If anyone has any suggestions on languages that are good at stuff like this or libraries that I am missing, please let me know! I have a test environment that I have been using: http://driverstestpractice.com/sandbox Currently all tracks on the site are set to the click track in order to test the track sync (which as you can tell is a little off)! Thanks!

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  • How do I output JSON columns in jQuery

    - by Mel
    I'm using the qTip jQuery plugin to create dynamic tool tips. The tooltip sends an id to a cfc which runs a query and returns data in JSON format. At the moment, the tooltip loads with the following: {"COLUMNS:" ["BOOKNAME","BOOKDESCRIPTION"["MYBOOK","MYDESC"]]} Here's the jQuery $('#catalog a[href]').each(function() { var gi = parseInt($(this).attr("href").split("=")[1]) $(this).qtip( { content: { url: 'cfcs/viewbooks.cfc?method=bookDetails', data: { bookID: gi }, method: 'get', title: { text: $(this).text(), button: 'Close' } }, api :{ onContentLoad : function(){ } }, }); }); As I mentioned, the data is returned successfully, but I am unsure how to output it and format it with HTML. I tried adding content: '<p>' + data.BOOKNAME + '' to api :{ onContentLoad : function(){ ..... to see if I could get it to output something, but I get a 'data is undefined error' What is the correct way to try and output this data with html formatting? Many thanks!

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  • A programming language for teaching data structures and algorithms with? [closed]

    - by Andreas Grech
    Possible Duplicate: Choice of programming language for learning data structures and algorithms Teachers have different opinions on what programming language they would choose to teach data structures and algorithms with. Some would prefer a lower level language such as C because it allows the student to learn more about what goes on beyond the abstractions in terms of memory allocation and deallocation and pointers and pointer arithmetic. On the other hand, others would say that they would prefer a higher level language like Java because it allows the student to learn more about the concepts of the structures and the algorithm design rather than 'waste time' and fiddle around with memory segmentation faults and all the blunders that come with languages where memory management is manual. What is your take on this issue? And also, please post any references you may know of that also discuss this argument.

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  • How to Generate Embeddable Widgets, and Return PartialView, JS & CSS as JSONP?

    - by DaveDev
    I found this question which is a great starting point towards creating embedded widgets that enable showing dynamic content on remote sites (i.e. a different domain). One problem I'm having is with the following code: public ActionResult SomeAction() { return new JsonpResult { Data = new { Widget = "some partial html for the widget" } }; } It says Widget = "some partial html for the widget" but this doesn't really mean anything to me. I assume that Widget would contain the HTML representing what the user wants to see on the screen, but How do I get the contents of my Partial View into Widget? Can anyone point me in the right direction? Thanks..

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  • how to get apache mod_cache work with mod_wsgi (django)?

    - by harmv
    I thought i'd speed up my django projects, by letting apache doing some caching for me. Unfortunately I see that apache never caches my dynamic pages. Has mod_cache problems with mod_wsgi served code ? My apache config: <VirtualHost *:80 ServerName myserver.com CacheEnable mem / # for testing only CacheIgnoreQueryString On CacheIgnoreCacheControl On WSGIDaemonProcess aname processes=1 threads=25 WSGIProcessGroup aname Alias /media/ /home/harm/projects/test/media/ WSGIScriptAlias / /home/harm/projects/test/wsgi.py The response does have the correct caching headers: Content-Length 2647 Content-Encoding gzip Vary Accept-Encoding Cache-Control public, max-age=3600 Keep-Alive timeout=15, max=100 Connection Keep-Alive Content-Type application/x-javascript Am I missing something ?

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  • What is so great about STL?

    - by Zygrob
    Hello StackOverflow. I am a Java developer trying to learn C++. I have many times read over the web (including StackOverflow) that STL is the best collections library that you can get in *any* language. (Sorry, I do not have any citations atm) However after studying some STL, I am really failing to see what makes STL so special. Would you please shed some light on what sets STL apart from the collection libraries of other languages and make it the _best_ collection library? Thanks in advance, Zygr??b.

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  • Why do .png backgrounds appear black on iPhone device but not simulator?

    - by David Rea
    I started with a .tiff file and used GraphicConverter to change it to a .png and set a transparency color. Worked fine in the simulator but when I pushed to the device the transparency color became black. Tested with a .png I downloaded from the net and that worked fine, so it seems to only happen with some files. Thus I suspect it has something to do with the way GraphicConverter writes the .pngs, but I don't know enough about file formats to debug it. Any ideas/suggestions? Ideally I'd like to programatically treat all .pngs because my app allowed dynamic loading of arbitrary files, so I can't verify the transparency beforehand.

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