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  • Segfault when calling a method c++

    - by shuttle87
    I am fairly new to c++ and I am a bit stumped by this problem. I am trying to assign a variable from a call to a method in another class but it always segfaults. My code compiles with no warnings and I have checked that all variables are correct in gdb but the function call itself seems to cause a segfault. The code I am using is roughly like the following: class History{ public: bool test_history(); }; bool History::test_history(){ std::cout<<"test"; //this line never gets executed //more code goes in here return true; } class Game{ private: bool some_function(); public: History game_actions_history; bool local_variable; }; bool Game::some_function(){ local_variable = game_actions_history.test_history(); if (local_variable == true){ return true; } else{ return false; } } Any tips or advice is greatly appreciated!

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  • making ajax request to another server

    - by santhosh
    Hi, I had a ajax sample code from W3Schools, where If i request ajax call to remote server the request getting fails. function loadXMLDoc() { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","http://www.google.com",true); xmlhttp.send(); } How to solve this..?

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  • JPA atomic query/save for multithreaded app

    - by TofuBeer
    I am in the midst of changing my JPA code around to make use of threads. I have a separate entity manager and transaction for each thread. What I used to have (for the single threaded environment) was code like: // get object from the entity manager X x = getObjectX(jpaQuery); if(x == null) { x = new X(); x.setVariable(foo); entityManager.persist(x); } With that code in the multi threaded environment I am getting duplicate keys since, I assume, getObjectX returns null for a thread, then that thread is swapped out, the next thread calls getObjextX, also getting null, and then both threads will create and persist a new X(). Short of adding in synchronization, is there an atomic way to get/save-if-doesn't-exist a value with JPA or should I rethink my approach EDIT: I am using the latest Eclipselink and MySql 5.1

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  • sharepoint spweb and spsite disposal

    - by user327045
    I've been using the following code in a .NET 1.1 SharePoint 2003 environment and it works great: try { site = SPControl.GetContextSite(Context); web = site.OpenWeb(); ... } catch (Exception export) { output.Write("Caught Exception: <br/><br/>"); output.Write(export.Message + "<br><br>"); output.Write(export.StackTrace); } finally { if (web != null) web.Dispose(); if (site != null) site.Dispose(); } However, I'm currently porting the code to a .NET 2.0 SharePoint 2007 environment and I get the following error message: "Trying to use an SPWeb object that has been closed or disposed and is no longer valid." If I comment out the Dispose() code, it works fine. But won't this cause memory leaks? What's the best way to fix the problem?

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  • Backbone.js "model" query

    - by Novice coder
    I'm a learning coder trying to understand this code from a sample MVC framework. The below code is from a "model" file. I've done research on Backbone.js, but I'm still confused as to exactly how this code pull information from the app's database. For example, how are base_url, Model.prototype, and Collection.prototype being used to retrieve information from the backend? Any help would be greatly appreciated. exports.definition = { config : { "defaults": { "title": "-", "description": "-" }, "adapter": { "type": "rest", "collection_name": "schools", "base_url" : "/schools/", } }, extendModel: function(Model) { _.extend(Model.prototype, { // Extend, override or implement Backbone.Model urlRoot: '/school/', name:'school', parse: function(response, options) { response.id = response._id; return response; }, }); return Model; }, extendCollection: function(Collection) { _.extend(Collection.prototype, { // Extend, override or implement Backbone.Collection urlRoot: '/schools/', name: 'schools', }); return Collection; } }

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  • Is it possible to avoid C++ compiler error (C2757) where 2 different header files contain same symbol for namespace & class?

    - by dharmendra
    Hi, I am facing a problem when implementing some new code to an existing library. This library already references a class with a name say 'foo'. The same name is used as a namespace in the other header file which has to be included to implement the new functionality. Since both the header files are a part of legacy code libraries I cannot amend them. So here I am looking for any way so as to avoid the Compiler Error (C2757: a symbol with this name already exists and therefore this name cannot be used as a namespace name). I am not sure whether it is possible or not. Hence, Any help shall be appreciated. Thanks For clarity here is the sample code illustration for the issue: HeaderA.h class foo {} HeaderB.h namespace foo { class ABC{} } HeaderC.h #include <HeaderA.h> #include <HeaderB.h> using namespace foo; class Toimplement{ ABC a; //Throws Error C2757 }

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  • Appending target="_blank" to links in an iframe without using <body onload>

    - by CincauHangus
    I'm trying to change the links in an iframe to load in a new window instead of the iframe itself. Currently I use this code in head: $(document).ready(function() { var oIFrame = document.getElementById("iframeID"); var oDoc = (oIFrame.contentWindow || oIFrame.contentDocument); if(oDoc.document) oDoc = oDoc.document; var links = oDoc.getElementsByTagName("a"); for(var i=0; i<links.length; i++) { links[i].target="_blank"; } }); However, the code above is triggered before the iframe is fully loaded with its contents. I know this code would work if it's triggered in the body onload attribute, but I'd like to avoid that method and implement it in a function or a file instead.

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  • PHP CURL sending POST to Django app issue

    - by Felipe Pelá
    This code in PHP sends a HTTP POST to a Django app using CURL lib. I need that this code sends POST but redirect to the page in the same submit. Like a simple form does. The PHP Code: $c = curl_init(); curl_setopt($c, CURLOPT_FOLLOWLOCATION, true); curl_setopt($c, CURLOPT_URL, "http://www.xxx.com"); curl_setopt($c, CURLOPT_POST, true); curl_setopt($c, CURLOPT_POSTFIELDS, 'Var='.$var); curl_exec($c); curl_close ($c); In this case, the PHP is sending the HTTP POST, but is not redirecting to the page. He is printing the result. My URL still .php and not a django/url/ I need be redirected to the django URL with the Post like a simple form in HTML does. Any Idea? Thanks.

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  • URLEncode Error

    - by user2949519
    I have an Android app. Basically what it does is that user can search a car reference no. in EditText for example:- 270/30 and retrieve all the details of the particular car with the same column value in the database. I'm encoding this editext value in Android using URLEncoder and decoding it back in php webservice code. But the decoded value im getting is 027/13 ....instead of 270/30. To make it clear more im here by pasting my java Encoding part EditText SearchField=(EditText)findViewById(R.id.editText1); String SearchValue= SearchField.getText().toString(); Now the encoding code in Asynctask is data +="&" + URLEncoder.encode("data", "UTF-8") + "="+SearchValue; Now the PHP part where i decoded this code $data = urldecode($_POST['data']); Please help me how to encode/decode this given format ... Thanks in Advance

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  • how to handle signout when the browser in close in flex 3?

    - by kumar1425
    my project had audit module ,which inlcude each and every action of the user to be recoreded so when the user closes the browser the audit regarding the logout has to be stored in the database i found one solution in the net ,but it is working in my machine's IE but falied to work in the friends machines IE why? the code is: window.onbeforeunload = clean_up; function clean_up() { var flex = document.${application} || window.${application}; flex.myFlexFunction(); } i place this code in the index.template.html file in the html-template foleder under flex src and i place the below code in my main application.mxml file ExternalInterface.addCallback("myFlexFunction",btnLogout); and i defined the logout funtion if any one has solution plz answer me............. thank you..................

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  • Context Menu SourceControl Error

    - by developer
    Hi All, I am trying to use contextmenu in my textbox control and I want to bind the textbox value to the value selected in context menu,below is my code <Window.CommandBindings> <CommandBinding Command="local:MyPanel.ChangeTextboxValue" Executed="ChangeTextboxValue_Executed"/> </Window.CommandBindings> CODE-BEHIND public static RoutedUICommand ChangeTextboxValue = new RoutedUICommand ("ChangeTextboxValue", "ChangeTextboxValue", typeof(MyPanel)); private void ChangeTextboxValue_Executed(object sender, ExecutedRoutedEventArgs e) { string oldvalue = Convert.ToString(e.Parameter); (((sender as MenuItem).Parent as ContextMenu).PlacementTarget as TextBox).Text = oldvalue; } oldvalue is the value I want the textbox controls value to change to. I am trying to use above code but it gives me the error, 'Object reference not set to an instance of object'. I tried to debug the app and I get ContextMenu as null.. .Any ideas why??

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  • Javascript: sort objects

    - by tom
    function Player() { var score; this.getScore = function() { return score; } this.setScore = function(sc) { score = sc; } } function compare(playerA, playerB) { return playerA.getScore() - playerB.getScore(); } var players = []; players['player1'] = new Player(); players['player2'] = new Player(); Array(players).sort(compare); I have code that is similar to the above. When I step through the code with a debugger, the compare function never gets called and the array isn't sorted. I'm not sure what's wrong with my code?

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  • Is there a size limitation for an Access DB destination in SSIS?

    - by Adam V
    I'm creating an SSIS package, which will read through a user's SQL database and populate the tables in an Access database. However, for the largest user databases, I start getting errors around the time the Access file reaches approx. 2 GB. Has anyone run into this problem? Is this a size limitation for this operation? More information: I'm getting the error code 0xC020907B, but no additional information that I can see. Error: 0xC0209029 at , [733]: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR. The "input "OLE DB Destination Input" (746)" failed because error code 0xC020907B occurred, and the error row disposition on "input "OLE DB Destination Input" (746)" specifies failure on error. An error occurred on the specified object of the specified component. There may be error messages posted before this with more information about the failure.

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  • DataGridView and the CellEndEdit Event

    - by Brandon
    I have a DataGridView, and would like to hook into the CellEndEdit event. I've been able to successfully hook into the CellContentClick event, but am having issues with CellEndEdit. I added the following code to my Form1.cs file: private void dataGridView1_CellEndEdit(object sender, DataGridViewCellCancelEventArgs e) { dataGridView1[0, 0].Value = "Changed"; } With that code, nothing happens when I am done editing a cell. Is there anything else that I need to do to successfully hook into this event? I see that CellContentClick has a this.dataGridView1.CellContentClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellContentClick); line of code in the Form1.Designer.cs file, but I tried to mimic this for CellEndEdit, and received a compile error (No overload for 'dataGridView1_CellEndEdit' matches delegate 'System.Windows.Forms.DataGridViewCellEventHandler')

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  • Select Menu, go to url on select with JQuery?

    - by Keith Donegan
    Hey Guys, I have the following html: HTML markup <ul id="test"> <li><a href="http://www.yahoo.com">yahoo</a></li> <li><a href="http://www.google.com">Google</a></li> </ul> And some JS code: JQuery/JavaScript Code $('ul#test').each(function() { var select=$(document.createElement('select')).insertBefore($(this).hide()); $('>li a', this).each(function() { option=$(document.createElement('option')).appendTo(select).val(this.href).html($(this).html()); }); }); This code produces a select dropdown menu, exactly what I want, but my question is how do I go to the url on select? So if I click yahoo, it brings me to yahoo.com? Thanks for your help!

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  • Trying to read keyboard input without blocking (Windows, C++)

    - by Adam E
    I'm trying to write a Windows console application (in C++ compiled using g++) that will execute a series of instructions in a loop until finished OR until ctrl-z (or some other keystroke) is pressed. The code I'm currently using to catch it isn't working (otherwise I wouldn't be asking, right?): if(kbhit() && getc(stdin) == 26) //The code to execute when ctrl-z is pressed If I press a key, it is echoed and the application waits until I press Enter to continue on at all. With the value 26, it doesn't execute the intended code. If I use something like 65 for the value to catch, it will reroute execution if I press A then Enter afterward. Is there a way to passively check for input, throwing it out if it's not what I'm looking for or properly reacting when it is what I'm looking for? ..and without having to press Enter afterward?

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  • UTF8 issues on Linux

    - by user363808
    Hi, I have some code that fetches some data from the database, database codepage is UTF8. When I run the code on a linux box, some characters come out as question marks (?) but when I run the same code on a windows server, all characters appear correctly. When I do: $ $LANG Following is returned en_SG.UTF-8 en_SG is something that doesn't look correct, it should be en_US but the latter part of the returned string is UTF-8 which is good. Is there anything else that I can look into to fix the character corruption problem?

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  • Trying to use table aliases in SQL...

    - by user366685
    I'm a graphic designer trying my best to understand table aliases, but it's not working. Here's what I have so far: SELECT colours.colourid AS colourid1, combinations.manufacturercolourid AS colourmanid1, colours.colourname AS colourname1, colours.colourhex AS colourhex1, combinations.qecolourid2 AS colouridqe2, colours.colourid AS colourid2, colours.colourname AS colourname2, colours.colourhex AS colourhex2, colours.colourid AS colourid3, combinations.qecolourid3 AS colouridqe3, colours.colourname AS colourname3, colours.colourhex AS colourhex3, colours.colourid AS colourid4, combinations.qecolourid4 AS colouridqe4, colours.colourname AS colourname4, colours.colourhex AS colourhex4, combinations.coloursupplierid FROM combinations INNER JOIN colours ON colours.colourid = combinations.manufacturercolourid; Now, the idea is that in the colours lookup table, the id will pull the colour code, hex and name from the lookup table so that I can pull the colour code, hex and name for the 4 colours that I'm looking for. I can get this to work, but it only pulls up the first name, code and hex and I'm just not seeing what I'm doing wrong.

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  • A good F# codebase to learn from

    - by Lucas
    Hi all, I've been teaching myself F# for a while now. I've read Programming F# by Chris Smith (great book) and I've written a few small scripts for getting the job done here and there. But IMO the best way to learn a new programming language—and more importantly, the idioms that come with it—is to read a good open source codebase written in that language. Naturally, writing code in that language is crucial, but in the beginning, you're basically struggling with your own ignorance about how things should be done. You could perform certain tasks one way or the other, but it takes experience to realize the flaws and virtues of each. Even after you've gotten a firm grasp of how things work, reading the code of people who have an even firmer one helps a great deal. Most would agree that the most insightful parts of any learn-a-programming-language book are the code examples, and reading a well-written open source codebase is the next level of that. So are there any out there for F#?

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  • Save the contents of manipulated div to a variable and pass to php file

    - by Danielle Zarcaro
    I have tried to use AJAX, but nothing I come up with seems to work correctly. I am creating a menu editor. I echo part of a file using php and manipulate it using javascript/jquery/ajax (I found the code for that here: http://www.prodevtips.com/2010/03/07/jquery-drag-and-drop-to-sort-tree/). Now I need to get the edited contents of the div (which has an unordered list in it) I am echoing and save it to a variable so I can write it to the file again. I couldn't get that resource's code to work so I'm trying to come up with another solution. If there is a code I can put into the $("#save").click(function(){ }); part of the javascript file, that would work, but the .post doesn't seem to want to work for me. If there is a way to initiate a php preg_match in an onclick, that would be the easiest. Any help would be greatly appreciated.

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  • pyplot.scatter changes the data limits of the axis

    - by Erotemic
    I have some code which plots some points. I substituted ax.scatter for ax.plot so I could control the color of each point individually. However when I make this change the axis x and y ranges seem to increase. I can't pinpoint why this is happening. The only thing I've changed is plot to scatter. This code makes an axis that is too big ax.scatter(x, y, c=color_list, s=pts_size, marker='o', edgecolor='none') #ax.plot(x, y, linestyle='None', marker='o', markerfacecolor=pts_color, markersize=pts_size, markeredgewidth=0) This code does the right thing (but I can't control the color) #ax.scatter(x, y, c=color_list, s=pts_size, marker='o', edgecolor='none') ax.plot(x, y, linestyle='None', marker='o', markerfacecolor=pts_color, markersize=pts_size, markeredgewidth=0) Is there a way I can call scatter such that it doesn't mess with my current axis limits?

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  • Converting digits, generated by weblog service, to Arabic form

    - by Sorush Rabiee
    sorry if this is irrelevance :-) I need to write something in my html code to convert digits of form 0123456789 to ?????????? (Persian digits uni06F0..uni06F9). the number of visitors is generated by blog service. and I want to convert its digits to Arabic. Counter: ????? ????????????? : <BlogSky:Weblog Counter /> ??? the Persian part of above code mean 'Number of visitors' and 'Persons' (from left to right). but digits are represented in latin (0123...). Is it possible to write something like a function in html? i want it to be a global one for using in weblogs. Note: I don't know anything about web programming languages. I'm not sure about language of above code. (html?)

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  • JQuery and PHP validation problem?

    - by DuH
    I want to do the validation on my PHP side and then have my JQuery code display your changes have been saved when the submit button is clicked but the JQuery code states that the changes have been saved even when the validation fails. How can i fix this so that PHP can do the validation and then JQuery can do its thing when PHP has finished its validation? Here is my Jquery code. $(function() { $('#changes-saved').hide(); $('.save-button').click(function() { $.post($('#contact-form').attr('action'), $('#contact-form').serialize(), function(html) { $('div.contact-info-form').html(html); $('#changes-saved').hide(); $('#changes-saved').html('Your changes have been saved!').fadeIn(4000).show(); }); $('a').click(function () { $('#changes-saved').empty(); $('#changes-saved').hide(); }); return false; // prevent normal submit }); });

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  • mySql Delete only removes the data not the entire entry

    - by Mick
    Hi all I have this line in my php code $insert = "DELETE FROM allocation_table WHERE job = '$jobnumber' " ; Mysql_query ($insert) ; The problem is it will remove all the values from the the one line in my table but not the entry itself. as you can see in the picture if I delete where job = 315 , it does not delete the line but does delete all the entries Yet in this code that preceeds it (a different table) . it works fine and the whole line is removed $insert = "DELETE FROM event WHERE jobnumber = '$jobnumber' " ; mysql_query ($insert) ;enter code here can anyone offer some advice please ??

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  • Printing contents of a dynamically created iframe from parent window

    - by certainlyakey
    I have a page with a list of links and a div which serves as a placeholder for the pages the links lead to. Everytime user clicks on a link an iframe is created in the div and its src attribute gets the value of the link href attribute - simple and clear, sort of external web pages gallery. What i do have a problem with is printing the contents of the iframe. To do this i use this code: function PrintIframe() { frames["name"].focus(); frames["name"].print(); } The issue seems to be that iframe is created dynamically by JQuery - when I insert an iframe right into the html code, the browser prints the external page all right. But with the same code injected by JavaScript nothing happens. I tried to use JQ 1.3 'live' event on "Print" link, no success. Is there a way to overcome this?

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