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• Current ways to do data binding in .NET 3.5 with C# 3.0 and WinForms

  - by kryptic

  Hello Everyone, I have an existing C# 3.0 WinForms project with .NET 3.5 that talks to a MySQL database. I would like to use data binding (I'm new to this, so I've been doing all of the UI updates manually) to simplify things. I followed a link from this question to this article which mentions using a DataSet but also follows up with "my view on this topic is strongly in favor of Business Objects." Also that was with .NET 2.0. What are the current methods to use data binding with a WinForms application? What are their advantages in terms of simplicity, how much additional code is necessary, etc. For reference, I use an ORM approach to build objects with public properties from a database. I want to map these properties for each object onto UI elements like TextBoxes. There could be many properties for an object so I want to simplify the code to do this.

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• Suggest Cassandra data model for an existing schema

  - by Andriy Bohdan

  Hello guys! I hope there's someone who can help me suggest a suitable data model to be implemented using nosql database Apache Cassandra. More of than I need it to work under high loads and large amounts of data. Simplified I have 3 types of objects: Product Tag ProductTag Product: key - string key name - string .... - some other fields Tag: key - string key name - unique tag words ProductTag: product_key - foreign key referring to product tag_key - foreign key referring to tag rating - this is rating of tag for this product Each product may have 0 or many tags. Tag may be assigned to 1 or many products. Means relation between products and tags is many-to-many in terms of relational databases. Value of "rating" is updated "very" often. I need to be run the following queries Select objects by keys Select tags for product ordered by rating Select products by tag order by rating Update rating by product_key and tag_key The most important is to make these queries really fast on large amounts of data, considering that rating is constantly updated.

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• Connecting to the Internet from FreeBSD on VirtualBox

  - by Alex Farber

  I just installed FreeBSD in the VirtualBox running on Ubuntu host, and need instructions to enable Internet access from FreeBSD. My guess that I need to run /usr/sbin/sysinstall and do something there, but I need exact instructions. Details. Host: Ubuntu 9.10, connected to the Internet through LAN. Sun VirtualBox 3.1.4. FreeBSD 8.0 running in the VirtualBox.

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• Drag and Drop File into Application under run as administrator

  - by Chris Dwyer

  Whenever I have an application running (Visual Studio 2008, Notepad, etc.) under "Run as Administrator", I cannot drag and drop files from Windows Explorer into the application. I've tried running Windows Explorer as administrator, but to no avail. Is there a way to get drag and drop to work when my applications are under "Run as Administrator"?

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• Access DotNetPanel/WebsitePanel Enterprise Server from outside the loopback address

  - by Ryan French

  Hi Peoples, I am currently investigating integration of DotNetPanel/WebsitePanel with a website that is running ColdFusion. The issue I have come across is that it seems WebsitePanel only allows access to the Enterprise Server (where the web services are that I need access to) when the request is coming from the same physical machine (i.e. on the loop-back address 127.0.0.1). This unfortunately doesnt really work out too well with our current setup as we have our ColdFusion server running on one machine and WebsitePanel running on another. Does anyone have any suggestions as to how we can change this? Currently we are investigating writing a transparent proxy server that will sit on the portal machine and pass requests between the two sites, but that is less than ideal.

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• How do I detect the environment in Salesforce?

  - by Craig Harris

  I am integrating our back end systems with Salesforce using the web services. I have production and stage environments running on different URLs. I need to be able to have the endpoint of the web service call be different depending on whether the code is running in the production or sandbox Salesforce instance. How do I detect the environment. Currently I am considering looking up a user to see if there user name ends in 'devsandbox' as I have been unable to identify a system object that I can query to get the environment. Further clarification: The location I need to determine this is within the Apex code that is invoked when I select a button in Salesforce. My custom controller needs to know if it running in the production or sandbox Salesforce environment.

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• Using a Loader for a string of QML

  - by Robbert

  In Qt 5.3 I've been using the Loader QML element for loading screens. Now I'm trying to load a string of QML dynamically. Qt.createQmlObject enables me to do so, but I can't seem to get the Loader element to play along. Seems like Loader only takes a URL (QUrl) or component (QQmlComponent), but Qt.createQmlObject creates an object (QObject). I'm new to QML, but from my understanding components are reusable elements, similar to classes, and objects are the instances of those classes. I thus can't seem to wrap my head around why Loader wouldn't work with objects. How can I show a loading screen while (asynchronously) parsing and initializing a string of QML? Example QML code: Item { Rectangle {id: content} Loader {id: loader} Component.onCompleted: { var obj = Qt.createQmlObject('import QtQuick 2.3; Rectangle {}', content); loader.source = obj; // Throws error. } }

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• Creating a process in a non-zero session from a service in windows-2008-server?

  - by Itay Levin

  Hi, I was wondering if there is a simple way for a service to create a process in user session? My service is running as a user(administrator) account and not as a LocalSystem acount, therefore i can't use the WTSQueryUserToken function. i have tried calling OpenProcessToken(GetCurrentProcess,TOKEN_ALL_ACCESS,TokenHandle); but when i use this token to run CreateProcessAsUser(TokenHandle,.....) my process is still running in session 0. how can i resolve this issue? I'm using an Ole automation so i don't really care on which session the process will be running on, as long it is not the session 0 - because the Ole from some reason doesn't create its processes (winword.exe for instance) in session 0, but rather it creates them in other user sessions. Any suggestions will be welcome. Thanks in advance.

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• Core-Data + AFNetworking + UI Updating (Responsiveness)

  - by Mustafa

  Here's the scenario: I'm writing a DownloadManager, that allows the user to download, pause, cancel, download all, and pause all. The DownloadManager is a singleton, and uses AFNetworking to download files. It has it's own private managed object context, so that user can freely use other parts of the application (by adding, editing, deleting) core-data objects. I have a core-data entity DownloadInfo that stores the download information i.e. fileURL, fileSize, bytesRead, etc. The DownloadManager updates the download progress in DownloadInfo (one for each file). I have a DownloadManagerViewController which uses NSFetchedResultsController to show the download status to the user. This download view controller is using the main managed object context. Now let's say that I have 20 files in the download queue. And let's say that only 3 concurrent downloads are allowed. The download manager should download the file, and show the download progress. Problem: The DownloadInfo objects are being updated by the DownloadManager at a very high rate. The DownloadManagerViewController (responsible for showing the download progress) is updating the list using NSFetchedResultsControllerDelegate methods. The result is that a lot is happening in the main queue and application has very poor responsiveness. How can I fix this? How can I make the application responsive, while showing the download progress? I don't know how else to communicate that the download status between DownloadManager and DownloadManagerViewController. Is there another/ a better way to do this? I don't want to use main managed object context in my DownloadManager, for reasons mentioned above. Note, that the DownloadManager is using AFNetworking which is handling the requests asynchronously, but eventually the DownloadInfo objects are updated in the main thread (as a result of the callback methods). Maybe there's a way to handle the downloads and status update operations in a background thread? but how? How will I communicate between the main thread and the background thread i.e. how will I tell the background thread to queue another file for download? Thanks.

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• Flash video has become jittery in Karmic

  - by creamcheese

  When I first installed Karmic, I must have installed a Flash player or else it came with Karmic. It worked fine and I have been running the Ubuntu updates whenever requested by the OS. However, now my Flash video is extremely jittery and the whole computer kinds of slows down whenever I try to play a Flash video file. I have no idea what type of Flash player is running or what is the best one to use. Would appreciate any recommendations. Thanks.

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• Serializing classes in C#. nested XML

  - by Jebli

  Hi All, I have to generate XML in the below format <objects> <items> <item ="delete"> <searchfields> <searchfield name="itemname" value="itemValue" /> </searchfields> </item> </items> </objects> So I have generated the CS file using xsd.exe by converting the above XML to XSD. xsd.exe -c -l:c# -n:XmlSerializationDeleteObject DeleteObject.xsd The CS file that is generated contains 4 classes. My question is i have to build the XML in the above mentioned format using the class that is generated. I am able to serialize the class files one by one which retirns one tag at a time, but i am unable to build it in the way that i mentioned above. Please help Regardas, jebli

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• issue with parsing JSON string

  - by bgosalci

  I have this object which I use as a list of objects: var objList = new Object(); This is then serialized using JSON serialize. If there are no object added or all objects have been removed from the list and the blank objList is serialized, parsing the objList using JSON parser in IE, it will occasionally fail to evaluate the objList as a JavaScript object. This causes the Object doesn't support this property or method error when tying to add an object to the objList: objList['idx']=objData; Does anyone know why does IE occasionally fail to evaluate objList:{} to an object and has someone else come across this issue. The actual JSON string when the objList is '{}' The objList is initialised: objList = g_objList.parseJSON();

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• how to add solr to run on startup?

  - by Blankman

  I asked this question before, but I think I got answers that were cron job type answers. I want the solr service to startup if I reboot my computer, and I also want it to run by itself instead of me opening up cmd.exe and running it manually, and then having to close my terminal connection (not log off as that will close it). What options do I have? I am on windows server 2008, IIS7 running a asp.net application that uses solr.

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• Using audio plugins in a rewire slave application

  - by Nik Reiman

  I would like to be able to use VST/AudioUnit effects from a rewire slave such as Ableton Live, but it seems that Live doesn't let you use plugins when running in this mode. I'm not exactly sure why that is, but it would be nice to get working so that I could use VST plugins from within GarageBand without having to use the VST2AU wrapper plugin. What sequencers let you use VST plugins when running as a rewire slave?

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• C# - Removing items from lists and all references to them.

  - by LiamV

  Hi there, I'm facing a situation where I have dependent objects and I would like to be able to remove an object and all references to it. Say I have an object structure like the code below, with a Branch type which references two Nodes. public class Node { // Has Some Data! } public class Branch { // Contains references to Nodes public Node NodeA public Node NodeB } public class Graph { public List<Node> Nodes; public List<Branch> Branches; } If I remove a Node from the Nodes list in the Graph class, it is still possible that one or more Branch objects still contains a reference to the removed Node, thus retaining it in memory, whereas really what I would quite like would be to set any references to the removed Node to null and let the garbage collection kick in. Other than enumerating through each Branch and checking each Node reference sequentially, are there any smart ideas on how I remove references to the Node in each Branch instance AND indeed any other class which reference the removed Node? Much appreciated, Liam

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• Python equivalent of Java's compareTo()

  - by astay13

  I'm doing a project in Python (3.2) for which I need to compare user defined objects. I'm used to OOP in Java, where one would define a compareTo() method in the class that specifies the natural ordering of that class, as in the example below: public class Foo { int a, b; public Foo(int aa, int bb) { a = aa; b = bb; } public int compareTo(Foo that) { // return a negative number if this < that // return 0 if this == that // return a positive number if this > that if (this.a == that.a) return this.b - that.b; else return this.a - that.a; } } I'm fairly new to classes/objects in Python, so I'd like to know what is the "pythonic" way to define the natural ordering of a class?

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• Install several lighttpd services in same server

  - by Pedro

  Hi, I'm running one videos streamming site using lighttpd, but at the moment the badwith of the server is at 50%, memory is ok, disks ok... But lighttpd is giving me timeouts. I think that if I had 2 or 3 lighttpd services running in the same machine I can solve this issue. How can I setup this? Regards, Pedro

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• Successful business model of small development tool

  - by Vladimir

  I have an idea on my mind to develop and sell small helpful developer tools like the tool asked in this question http://stackoverflow.com/questions/2562378/visual-objects-editor. I am looking for your answers which will shortly describe "How" and "What" to sell in order to be successful at that. I imagine different answers here from concrete to more general. Examples: "Sell your visual objects editor and I will buy it :-)" "Tbe only way to sell developer tool is to integrate it with known Java IDE" "Developers won't pay for the tools they use. Make it free and be famous" I encourage others to vote for the answers they like the most.

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• Nagios check for wuauserv on Windows Server 2008+

  - by Mechaflash

  From Windows Server 2008+, wuauserv is no longer a service that's ran all of the time and is instead ran as a scheduled task. I'm not sure of the exact behavior of how the scheduled task is created as it seems the schedule is generated and edited by another service. Prior to this, we setup nagios to just check for the running service to ensure it was accepting updates. My question is, how does one track the proper execution/running of wuauserv service in Windows Server 2008+ to ensure it is accepting updates with nagios?

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• Issue reading packets from a pcap file. dpkt module. What gives?

  - by Chris

  I am running the following test script to try to read packets from a sample .pcap file I have downloaded. It won't seem to run. I have all of the modules, but no examples seem to be running. import socket import dpkt import sys pcapReader = dpkt.pcap.Reader(file("test1.pcap", "rb")) for ts, data in pcapReader: ether = dpkt.ethernet.Ethernet(data) if ether.type != dpkt.ethernet.ETH_TYPE_IP: raise ip = ether.data src = socket.inet_ntoa(ip.src) dst = socket.inet_ntoa(ip.dst) print "%s -> %s" % (src, dst) For some reason, this is not being interpreted properly. When running it, I get KeyError: 138 module body in test.py at line 4 function __init__ in pcap.py at line 105 Program exited. Why is this? What's wrong?

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• JSON - msg.d is undefined error

  - by Narmatha Balasundaram

  Hi - Webmethod returns an array of objects - something like this {"d": [[{"Amount":100,"Name":"StackOverflow"}, {"Amount":200,"Name":"Badges"}, {"Amount":300,"Name":"Questions"}]]} On the client-side, when the JSON is referenced using msg.d, I get a msg.d is undefined error. I am using jQuery JavaScript Library v1.4.2 How do I access the elements in the array of objects? Adding more findings, code and questions: I don't see __type in the JSON object that is returned. Does that mean that the object sent from the server is not JSON formatted? When the __type is not a part of the response, I will not be able to use msg.d? (msg.d is undefined) Some more: 1. I can access the elements from client side using msg[0][0].Amount - How can I specifically JSON format my return object (from the server)

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• How to diagnose causes of oom-killer killing processes

  - by dunxd

  I have a small virtual private server running CentOS and www/mail/db, which has recently had a couple of incidents where the web server and ssh became unresponsive. Looking at the logs, I saw that oom-killer had killed these processes, possibly due to running out of memory and swap. Can anyone give me some pointers at how to diagnose what may have caused the most recent incident? Is it likely the first process killed? Where else should I be looking?

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• Closest Approach question for math/physics heads

  - by Kyle

  I'm using a Segment to Segment closest approach method which will output the closest distance between two segments of length. These objects are moving at variable speed each, so even when it succeeds I'm currently using a 10-step method and calculating the distance between 2 spheres as they move along the two segments. So, basically the length of each segment is the object's traverse in the physics step, and the radius is the objects radius. By stepping, I can tell where they collide, and if they collide (Sort of; for the MOST part.).. I get the feeling that there could be something better. While I sort of believe that the first closest approach call is required, I think that the method immediately following it is a TAD weak. Can anyone help me out? I can illustrate this if needed. Thanks alot!

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• How do I draw a proper parallelogram that can be animated on iPhone?

  - by Robert Kosara

  I'm trying to do something very simple: I need some parallelograms in my program. These are attached to other objects, all of which are UIViews. It's important that I be able to animate these, since the objects they are attached to can also be animated. I've figured out how to use the transform in UIView/CALayer to do this, but the problem is that these sheared UIViews don't look very nice: there is no anti-aliasing of the edges. Is there some other way to do this? I would like to use UIViews, since I also use them for user interaction and animation is so much easier than drawing by hand. I don't want to use OpenGL for this.

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• How can I set MAXLENGTH on input fields automatically?

  - by Gary McGill

  I'm using ASP.NET MVC RC2. I have a set of classes that were auto-generated "Linq-to-SQL Classes", where each class models a table in my database. I have some default "edit" views that use the neat-o Html.TextBoxFor helper extension to render HTML input fields for the columns in a table. However, I notice that there is no MAXLENGTH attribute specified in the generated HTML. A quick google shows that you can add explicit attributes using TextBoxFor etc. but that would mean that I need to hard-code the values (and I need to remember to do it for every input). This seems pretty poor, considering that everything was automatically generated directly from the DB, so the size of the columns is known. (Although, to be fair, the web-side stuff has to work with any model objects, not just with Linq-to-SQL objects). Is there any nice way of getting this to do the right thing?

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