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• Recordset Update errors when updating sql_variant field

  - by Stephen Nutt

  I'm using C++ and ADO to add data to a SQL Server 2005 database. When calling the Recordset Update method for a sql_variant column I'm getting the error DB_E_ERRORSOCCURRED and the error message Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done. If the value I'm adding is NULL all works fine and all values going to the fields that are not sql_variant types work. Does anyone know what I might be doing wrong? Thanks [Edit] I have some more information. The value we are storing is the empty string - ADO appears to want to store this in the sql_variant as a nchar(0), which of course is not a valid SQL data type. Is there a way to get an empty string in a sql_variant using the ADO batch commands?

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• Limit calls to external database with Python CGI

  - by Matt Ball

  I've got a Python CGI script that pulls data from a GPS service; I'd like this information to be updated on the webpage about once every 10s (the max allowed by the GPS service's TOS). But there could be, say, 100 users viewing the webpage at once, all calling the script. I think the users' scripts need to grab data from a buffer page that itself only upates once every ten seconds. How can I make this buffer page auto-update if there's no one directly viewing the content (and not accessing the CGI)? Are there better ways to accomplish this?

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• Django Template - Convert python list into a javascript object

  - by amcashcow

  I am working on a django / python website I have a page where I want to display a table of search results The list of results is passed in to the template as normal I also want to make this list of objects accessible to the javascript code My first solution was just create another view that returned json format. But each page load required calling the query twice. So then I tried only downloading the data using the json view and printing the table using javascript. but this is also not desirable as now the presentation layer is mixed into the javascript code. is there a way to create a javascript object from the python list as the page is rendered?

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• Explicit constructor still has default values even though a default constructor is not invoked.

  - by Phoenix

  According to my understanding a default constructor initializes the state of the object to default values, so if i provide an explicit no-arg public constructor like this then how are the values of d and e still getting initialized to zero because in this case the default constructor is not invoked. public class B extends A{ private int d; private int e; public B() { System.out.println(d); System.out.println(e); } } EDIT:: The only thing default constructor does is call to super() then how come if i have a explicitly mentioned a constructor here and A has a protected variable say c which is initialized to 17 in its constructor. Should I not be explicitly calling super() to be able to see that change since I'm using my own constructor ? Why is B still getting the value of 17 through inheritance ?

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• Paperclip generating wrong URLs in Heroku

  - by Tony

  Paperclip is generating wrong URLs in Heroku. I have an Audio model which has a mp3 field as follows: class Audio < ActiveRecord::Base has_attached_file :mp3, :storage => :s3, :s3_credentials => S3_CREDENTIALS, :bucket => S3_CREDENTIALS[:bucket], :path => ":rails_root/public/system/:attachment/:id/:style/:filename", :url => "/system/:attachment/:id/:style/:filename" I am calling audio.mp3.url from a controller, and it returns http://s3.amazonaws.com/MyApp/audios/mp3s//original/96a9ae89302fdf8462ee05eb829f2e17578b144e20120908-2-11f61zr.mp3?1347135050 instead of http://s3.amazonaws.com/MyApp/audios/mp3s/000/000/004/original/96a9ae89302fdf8462ee05eb829f2e17578b144e20120908-2-11f61zr.mp3?1347135050 (which works) Why is it missing the '000/000/004' part of the route? The same model is generating the right URL when used in a view. Any help? I am using paperclip 3.2.0 and Rails 3.1.8. Any help?

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• How do I use a named_scope to filter records in my model

  - by kibyegon

  I have a model "Product" with a "description" field. Now I want to have a link in the index page that when clicked will show all products where the description is blank (empty). In the model I have defined a named_scope like this named_scope :no_description, :conditions => { :description => "" } I have checked that the named_scope works by calling Product.no_description.count on the console. As far as I know, the controller is then supposed to handle the filter request from the link on the "index" action but be able to distinguish it from the default which is view all products. def index @products = Product.all ... My problem is getting the controller handle the different request, what route to setup for the link on the view and the actual link on the view. Hope I explained my problem.

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• Communication between .net winform and webform

  - by Pablo

  Hi, I need to make a webform communicate with a winform and back to the webform. The reason for this is it exists a webform software already made, and now it's needed the behavior of a .net component only available for winforms. We've tried going with Process.Start and shell.execute but with this approach the software hangs or it takes too long to respond. The webform also needs to be called from client pcs in the network, I think this adds another problem due to the non possibility of calling the execution of a file from a webform remotelly, but I dont know much about this technical issue we've read some articles about embedding a winform in a webform, sending data from a winform to a webform, etc. and we would like to know what's the recommend approach (if there is any) for handdling a situation like this.

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• Problem getting response from server using cURL, file_get_contents, etc

  - by shyam

  I am trying to get the response from a server, which is now not giving any response. I tried file_get_contents(), cURL, and tried getting the headers, but apparently the server is not responding. There are no headers returned or any response of any kind. Also, this happens when I try from my web server - it works fine in my local machine. The server I'm calling is an sms server, to use which they've given a url. The problem is only with this particular server. I get response while trying Google. So may be it's caused by the called server. What I wanna know is what could be (or how to find out) the reasons... Any advices?

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• Should I write small CGI scripts or a big, monolithic script?

  - by Space

  I am working on to create a web site to display some information about my system. This includes some graphs and some text information. For now I am creating different CGI scripts and calling them by creating links. A few days back one of my friends told me that instead of writting different CGI scripts, it's better to write single CGI script and create functions to call the part of code. I am confused. What do you prefer while creating a web site?

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• What's the most efficient way to manage large datasets with Javascript/jQuery in IE?

  - by RenderIn

  I have a search that returns JSON, which I then transform into a HTML table in Javascript. It repeatedly calls the jQuery.append() method, once for each row. I have a modern machine, and the Firefox response time is acceptable. But in IE 8 it is unbearably slow. I decided to move the transformation from data to HTML into the server-side PHP, changing the return type from JSON to HTML. Now, rather than calling the jQuery.append() time repeatedly, I call the jQuery.html() method once with the entire table. I noticed Firefox got faster, but IE got slower. These results are anecdotal and I have not done any benchmarking, but the IE performance is very disappointing. Is there something I can do to speed up the manipulation of large amounts of data in IE or is it simply a bad idea to process very much data at once with AJAX/Javascript?

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• jQuery - Programmatically Trigger Event

  - by Sonny

  I need to programmatically trigger a click event that's being handled by jQuery. Here's the current code: var $thumbs = $('#PhotoGalleryThumbs .tile'); var $zoom = $('#PhotoGallery #PhotoGalleryZoom img'); var $description = $('#PhotoGallery #PhotoGalleryDescription'); $thumbs.click(function(event) { event.preventDefault(); var $thumb = $(this); $thumb.addClass('selected') .siblings().removeClass('selected'); $zoom.attr('src', $thumb.children('a').attr('href')); $description.html($thumb.find('img').attr('alt')); }); I am having a mental block working out how to create a function out of the event handling code and then arbitrarily calling it for an element in the $thumbs object.

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• how to call the javscript funtion on table row click

  - by kumar

  hi, I have a javascript function.. <script type="text/javascript"> var RowClick = function() { $("#mytable").click( $("#showgrid").load('/Products/List/Items/')); }; </script> Can I call this function on onclick event on tr? I am calling something like this? <tr class="something" onclick="javascript:RowClick()');"> can i call like this? if I call its not loading the URL? can anybody help me out? thanks

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• Updating a popup window from source page

  - by Blem

  I have a list of people wrapped in a-tags with onclick for opening a popup window. That popup window contains a previous and next button that invoker a function in the parent window to get the previous/next a-tag and execute the onclick for it. nextAnchor.onclick(); This should update the popup window with the new persons info, but it doesn't update. Adding an alert("") right after makes it update. What i found searching is something about having to leaving the session before JavaScript will update the display and they suggested using setTimeout. Problem is i'm calling on a DOM element and i can't send it in to the setTimeout, so i ended up with setTimeout('eval("'+nextAnchor.getAttribute("onClick")+'")',10); So is there another way to make it update or a way of making the setTimeout use the onclick of a DOM element or is this an acceptable solution even though it uses eval?

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• I can get access to object's properties if method is called from anonymous function, but I can't do

  - by Kirzilla

  Hello, $.Comment = function() { this.alertme = "Alert!"; } $.Comment.prototype.send = function() { var self = this; $.post( self.url, { 'somedata' : self.somedata }, function(data) { //using anonymous function to call object's method self.callback(data); } ); } $.Comment.prototype.callback = function(data) { alert(this.alertme); } This code works great when I'm calling $.Comment.send(), but this code won't work... $.Comment.prototype.send = function() { var self = this; $.post( self.url, { 'somedata' : self.somedata }, self.callback //using direct access to method ); } Please, could you explain me why? Thank you

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• Property hiding and reflection (C#)

  - by tehMick

  Declaring a property in a derived class that matches the name of a property in the base class "hides" it (unless it overrides it with the override keyword). Both the base and derived class properties will be returned by Type.GetProperties() if their types don't match. However, if their types do match, shockingly only the derived class's property is returned. For instance: class A { protected double p; public int P { get { return (int)p; } set { p = value; } } } class B : A { public new int P { get { return (int)p; } set { p = value; } } } class C : B { public new float P { get { return (float)p; } set { p = value; } } } Calling typeof(C).GetProperties() will only return B.P and C.P. Is it possible to call GetProperties() in a way that returns all three? There is almost certainly a way to do it by traversing the inheritance hierarchy, but is there a cleaner solution?

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• WorkFlow and WCF dynamically launching WorkFlows

  - by Raj73

  I have a WF which will be hosted on WCF . The service Contract will contain a single operation containing two parameters. Parameter1 will be a string and will contain the name of the workflow to invoke and parameter two will contain the input for the invoked Work Flow. All operations will take the same parameter. All the operations will return the same return value. I have created the service implementation and I would like to depending on the value of parameter1 start executing the appropriate workflow and return the value (There can be number of workflow classes say Operation1, Operation2...which will be the passed in as the value in Parameter1). How can I instantiate different workflow classes and pass parameters and get the return values from them which I should then pass back to the calling Client. (Also Should I be using ReceiveActivities in all of my Launchable WorkFlow Classes ? ) Any code samples or pointers would help

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• Application crashes after when array of images are stored

  - by sujyanarayan

  Hi, I'm getting the screenshots from the following code:- CGImageRef cgScreen = UIGetScreenImage(); if (cgScreen) { UIImage *result = [UIImage imageWithCGImage:cgScreen]; CGImageRelease(cgScreen); return result; } I'm calling the above code in a timer of 1/1.0 seconds as:- [array addObject:[UIImage imageWithScreenContents]]; where imagewithScreenContents is a function. But after some seconds i.e after adding 90 frames application crashes. I'm unable to understand the problem. Can somebody help me in solving the problem. Thanks in Adv.

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• providing a java servlet with information

  - by tom

  Hi, i am new to servlets. I made a simple hello world programme that prints those famous 2 words to the screen when i access the page via a browser using http://localhost:8080/mypath/path... My question is now, how do i provide a servlet with information? Specifically considering the fact that my c# programme calculates a lookup value for a global system, then the "java" servlet processes that and returns a set of results. I have done the reverse thanks to help on here, regarding calling a returned string from the java servlet in c#. However i am not sure how i go about providing the servlet information. Do i pass it via the url? Thank you

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• How to instantiate objects of classes that have dependencies injected?

  - by chester89

  Let's say I have some class with dependency injected: public class SomeBusinessCaller { ILogger logger; public SomeBusinessCaller(ILogger logger) { this.logger = logger; } } My question is, how do I instantiate an object of that class? Let's say I have an implementation for this, called AppLogger. After I say ObjectFactory.For<ILogger>().Use<AppLogger>(); how do I call constructor of SomeBusinessCaller? Am I calling SomeBusinessCaller caller = ObjectFactory.GetInstance<SomeBusinessCaller>(); or there is a different strategy for that?

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• Adding a Google Calendar using apiClient

  - by EricCarmichael

  I'm finally able to get an Access Token, now I'm very confused as how to add a Calendar using only Google's provided apiClient. $apiClient = SiteController::getApiClient(); $service = new apiCalendarService($apiClient); $calendar = new Calendar(); $calendar->description = "What"; $service->calendars->insert($calendar); This produces: Error calling POST https://www.googleapis.com/calendar/v3/calendars?key=mykey: (400) Required Is there some documentation/examples on adding a Calendar? There are a ton of examples, it seems like, for simply adding an Event.

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• ImageData of an externally loaded Image?

  - by sri

  I load an external image and draw it on the Canvas element like so: var canvas = document.getElementById('canvas1'); var context = canvas.getContext('2d'); var image = new Image(); image.onload = function(evt) { context.drawImage(evt.target, 0, 0); } image.src = "test.jpg"; But I want to get the ImageData. So after calling context.drawImage, I do this: var imagedata = canvas.getImageData(); manipulate(imagedata); // modifies imagedata.data context.putImageData(imagedata, 0, 0); Is that the only way to get the imageData of an externally loaded image? Drawing the image on canvas & then getting the imagedata seems awfully slow. Am I missing something? Thanks!

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• Unit Testing Example, on a class with required fields?

  - by Mastro

  I'm new to developing Unit test and I can't find an example of how to test an existing class I have. The class has a save method which does an insert or update in the database when the user clicks Save in the UI. But the save method has required fields that need to be populated. And has other fields that do not. So how can I run this test properly? Was trying to write it out.. Give a user When user saves object Then Field1 is required then Field2 is required Then Field3 is required WhenUserSavesObject() object = new object object.field1 IsNot Nothing something like that right? And what about the other fields that are optional? How would I test the save method to make sure it takes all those values properly? Was trying to use BDD but not sure if I should try it or not. Can't find any example of classes with many properties that are needed when calling a test method.

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• Is there away to load a page only once with AJAX?

  - by digitup

  I have an AJAX call to load a function once the page is loaded, the function opens a lightbox a like frame with some data. The issue is that if I click on close (lightbox frame), the page loads again and again loading the frame so the use never reaches the page under the layer of frame since the frame load on infinite loop. The Ajax is repeating calling the function I guess but I would like to load the frame once and when the user clicks X (close) he may return to the original page. $(document).ready(function(){ var city = $('#citycode').html(); $.ajax({ //when page is loaded, fire the following function success: function(){ //the function to be fired located in the page in seperate file openX(city + //some other parameters); }}); }); Any tips?

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• auto_inline - inadequate documentation

  - by Mick

  I want to disable inlining for a particular function. What the compiler does for everything else should be as specified in the project properties. I found a page on a forum which suggested the following: #pragma auto_inline(off) void func() { } #pragma auto_inline() The author suggested that calling auto_inline() with no arguments will set the compiler to revert to doing whatever the default action was before the call to auto_inline(off). Can anyone confirm that this works for visual studio 2008? I ask because the VS2008 documentation makes no mention at all of what happens if you call this function with no arguments.

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• if else-if making code look ugly any cleaner solution?

  - by Vishal

  I have around 20 functions (is_func1, is_fucn2, is_func3...) returning boolean I assume there is only one function which returns true and I want that! I am doing: if is_func1(param1, param2): # I pass 1 to following abc(1) # I pass 1 some_list.append(1) elif is_func2(param1, param2): # I pass 2 to following abc(2) # I pass 1 some_list.append(2) ... . . elif is_func20(param1, param2): ... Please note: param1 and param2 are different for each, abc and some_list take parameters depending on the function. The code looks big and there is repetition in calling abc and some_list, I can pull this login in a function! but is there any other cleaner solution? I can think of putting functions in a data structure and loop to call them.

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