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• Composite events in locally scoped regions with Prism (CAL)

  - by Shaddix

  I'm starting to train Prism (CAL) with a small application and faced some problems. I'm creating multiple instances of my MainView, which itself contains some regions, and display them in the Shell. I'm using locally scoped regions to easily handle view injections within my MainView. Currently I'm searching for a way of communication between the views (viewModels) inside the MainView. Composite events could do it, but when I publish those events, they are handled in all instances of my MainView, which I really don't want. Is there a way of raising "locally scoped" composite events like with locally scoped regions? Or may be there's a better way of communicating between views in my case?

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• Can Tornado communicate with Cassandra, in Non-blocking asynchronous style?

  - by takaomag

  I'm working on a web project, which have to process so many client requests. So I am considering to use Cassandra and tornado. Tornado seems to have a build-in client(tornado.httpclient.AsyncHTTPClient), which can do http Non-Blocking request. But, Cassandra uses Thrift protocol. Using Thrift, Tornado seems to be blocked while quering to Cassandra. Has anyone got expereince? Please suggest how should I do. Or, is there any add-on module for this purpose? Thanks.

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• ASIHTTPRequest code design

  - by nico

  I'm using ASIHTTPRequest to communicate with the server asynchronously. It works great, but I'm doing requests in different controllers and now duplicated methods are in all those controllers. What is the best way to abstract that code (requests) in a single class, so I can easily re-use the code, so I can keep the controllers more simple. I can put it in a singleton (or in the app delegate), but I don't think that's a good approach. Or maybe make my own protocol for it with delegate callback. Any advice on a good design approach would be helpful. Thanks.

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• JEE Web Applications vs Web Services

  - by Zac

  Can someone confirm or clarify for me: From what I can tell, JEE web apps consist of a Servlet and/or JSP driven dynamic web page being fed back in the HTTP response, triggered by the JEE server receiving a HTTP GET or POST request. From what I can tell, JEE web services also make use of Servlets as the web tier components, however a WS Servlet receives a SOAP message and validates the contents of those messages with whatever WSDL the Servlet is WARed with. The response is also packaged in SOAP and sent back to the requestor. So, from what I can tell, both JEE web apps and WSes use Servlets as the web components, with the only real difference being the protocol used (raw HTTP vs SOAP, which is an extension of HTTP). This is the best I could come up with - am I right? Totally wrong? Close?

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• C# SerialPort.GetPortNames() behavior

  - by Gunner

  In my C# 2008 application, I use the SerialPort.GetPortNames() function to retrieve the list of currently available ports. What I have noticed is, when ever I plug in a USB device, it's port number i s shown in the list on my Application and when I unplug it and refresh the list, the port number is no longer there. One phase of the application involves reading/writing data from/to the device continuously. Now, my expectation is, If I unplug the device during the operation and get the current Port list using SerialPort.GetPortNames(), the Port Name will not be there and I can use that to make the decision that the device has been unplugged. To my surprise, the Port name is still found despite having it removed Why is the program behaving like this? The port name isn't listed when in no-communication mode. Does it have something to do with the device being removed when it's communicating?

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• ETW tracking from .net, user mode and driver

  - by Jack Juiceson

  Hi everyone, We have an application that parts of it are in .net, c++ usermode and C++ drivers. The application is divided into several executables that run on demand and communication with each other using LPC(the processes run in different sessions(winlogon)). Currently We have a home written logging service to which .net and c++ usermode communicate by sending LPC messages. The driver uses DbgPrint and is not always enabled, as it causes the code to run 30% slower(we have lots of logging). I want to have all the logs written in one place and preferably not writing the logger myself(I love log4cpp and log4net). The requirement is to write from all the executables and drivers into one place and to have minimal overhead. I have read that ETW is way to go, however I wasn't able to find already written logger that uses it like log4cpp or log4net. So basically my questions is, do you know if there is already implemented ETW appender for log4cpp and log4net I can use ?

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• setDelegate:self, how does it work?

  - by fuzzygoat

  I have a query regarding how delegates work. My understanding was that delegates take responsibility for doing certain tasks on behalf of another object. locationManager = [[CLLocationManager alloc] init]; [locationManager setDelegate:self]; [locationManager setDistanceFilter:kCLDistanceFilterNone]; [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; [locationManager startUpdatingLocation]; Am I right in thinking that in the example code above that the instance of CLLocationManager is created on a new thread so that it can get on with trying to find the location information it needs. When it completes its task (or encounters an error) it calls-back using the appropriate methods located in self e.g. locationManager:didUpdateToLocation:fromLocation: Essentially locationManager sends messages to self (which conforms to the correct delegate protocol) when things happen cheers gary

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• Is T R O L L O L O G Y a good term for studies of cyber spying, cyber stalking and cyber mobbing ? [closed]

  - by e-mental

  To fight spam and to free speech is necessary for produtive online communication. But this field is plenty of problems and there are many questions not yet put together. The last problem of constituting an interdisciplinary forum and theoretical frame for such studies of cyber spying & stalking & mobbing is the best name for it. But I would like to ask, whether trollology is a good idea - or if You have betters. Thanx a lot.

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• WCF is throwing UnauthorizedAccessExceptyion after upgrade to .NET 4.0

  - by Andrey

  I have a pretty simple client-server ASP.NET app; communication is via WCF service. All worked perferctly inVS 2008, now I upgraded to VS2010 and every time the client code is trying to instantiate a channel to the server: new ChannelFactory<IMemberService>("Members.MemberService").CreateChannel(); it throws an UnauthorizedAccessException "Access denied". Were there any breaking changes in the new version, or do I need to add some configuration? I'm pretty stuck, any ideas would be highly appreciated! BTW, binding used is basicHttpBinding, i don't know if thats important here. Thank you, Andrey

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• WCF - Compact Framework - Pull data from mobile client

  - by jagse

  Hello guys, I want to communicate xml serialized objects from the server to the client and the other way arround. Now it is (probably) easy to invoke methods from a mobile client (compact framework) using WCF, but is there a way so that the server can invoke methods on the client side or some other way to pull data from the client? I know that callback contracts are not available in the compact framework as you can see here: http://blogs.msdn.com/andrewarnottms/archive/2007/09/13/calling-wcf-services-from-netcf-3-5-using-compact-wcf-and-netcfsvcutil-exe.aspx Originally I thought of socket programming and of developing this by myself, then someone here mentioned WCF. But it seems like WCF only would work in a non mobile environment as I need callbacks. Anyone can help me with this? Is it possible to develop a two way communication with a desktop server and multiple mobile clients using WCF, or will I have to do socket programming? Thanks for any advice or any kind of help!

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• Accessing an asp.net web service with classic asp

  - by thchaver

  My company is considering working with another company on a particular module. Information would be sent back and forth between us through my web service. Thing is, my web service uses ASP.NET, and they use classic ASP. Everything I've found online says (it's a pain, but) they can communicate, but I'm not clear on some details. Specifically, do I have to enable GET and POST on my web service? If I don't have to, but could, would enabling them make the communication significantly easier/better? And finally, GET and POST are disabled by default because of security. What are the security risks involved in enabling them?

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• How do I get Java to use the serial port in Linux?

  - by Phillip Gibb

  We make use of a java application that manages a pinpad via the serial port. This works perfectly on windows with the Sun Comm.jar, the supplied dll and the properties file. Now we are attempting to use this solution on Linux (actually it does run on various other flavours of linux out in the field) - with Ubuntu server mode. After much attempts - blood, sweat and almost tears we have this scenario: Java version 1.4.2_17 Linux - Ubuntu Comm libs - Comm3 supplied by sun with the default driver specified An external comm test shows the comm ports: /dev/ttyS0 and /dev/ttyS1 But the java application says unable to open port /dev/ttyS1 (using the RXRT files produces invalid port errors) Has anyone been able to use java 1.4.2 on linux for serial port communication and found a solution that I could apply in my scenario? greatly appreciated Phill

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• bbcode hyperlink issue (help!!)

  - by Jorm

  I'm having an annoying :) I use regexes from this: http://forums.codecharge.com/posts.php?post_id=77123 if you enter [url]www.bob.com[/url] it leads too http://localhost/test/www.bobsbar.com So I added before http://$1 in the replacement. That fix it but then [url]http://www.bob.com[/url] will lead to http://http://www.bobsbar.com How would you fix this? I want my users to be able to post links with AND without http:// and i want it to redirect to the site -_- Hope you understand this. Jorm Edit function bbcode_format($str) { $str = htmlentities($str); $find = array( '/\[url\](.*?)\[\/url\]/is', // hyperlink '/\[url\](http[s]?:\/\/)(.*?)\[\/url\]/is' // hyperlink http-protocol ); $replace = array( '<a href="$1" rel="nofollow" title="$1">$1</a>', '<a href="$1$2" rel="nofollow" title="$2">$2 THIS WORKS</a>' ); $str = preg_replace($find, $replace, $str); return $str; } both www.bob.com and http://www.bob.com uses the first replacement

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• Ubuntu to Ubuntu VNC over SSH tunnel

  - by rxt

  I have a Linux Ubuntu desktop at home, ssh enabled, vnc server installed, router rule configured. It all works, and at home I can connect via the local network from my Mac. From the outside I can login via ssh. I've configured putty as follows: session: host name and port number connection ssh tunnel: forwarded ports: L5900|192.168.0.23 the local address is: 192.168.1.45 When I make the connection I can login to the remote machine. Then I open Remote Desktop Viewer. I click connect protocol: vnc host: ? use host as ssh tunnel: ? I don't know what to use for the last two options. Which ip-addresses should I use?

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• Can HTTP URIs have non-ASCII characters?

  - by Cheeso

  I tried to find this in the relevant RFC, IETF RFC 3986, but couldn't figure it. Do URIs for HTTP allow Unicode, or non-ASCII of any kind? Can you please cite the section and the RFC that supports your answer. NB: For those who might think this is not programming related - it is. It's related to an ISAPI filter I'm building. Addendum I've read section 2.5 of RFC 3986. But RFC 2616, which I believe is the current HTTP protocol, predates 3986, and for that reason I'd suppose it cannot be compliant with 3986. Furthermore, even if or when the HTTP RFC is updated, there still will be the issue of rationalization - in other words, does an HTTP URI support ALL of the RFC3986 provisos, including whatever is appropriate to include non US-ASCII characters?

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• Expanding all items of a NSOutlineView that loads data from a data source

  - by matei

  First of all I'm new to cocoa development so I suppose I'm probably trying to do this the wrong way, but here goes: I have a NSOutlineView which loads the data from a NSOutlineViewDataSource imnplementation. I want all the items to be expanded after they are loaded, but i can't seem to find an event fired when the data has finished loading, so I can send a [outlineView expandItem:nil expandChildren: YES] to it. I looked into the NSOutlineViewDelegate protocol but I was unable to find a sutable place for this call. What would be the best approach for this problem ?

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• Can I get Raid disk status by using PS?

  - by David.Chu.ca

  I have a HP server with Raid 5. Port 0 and 1 are used for data & OS mirroring. The software come with the Raid 5 is Intel Matrix Storage Manager and there is manager console as windows based api to view all the ports, including their status. Now they are all in Normal status. I am not sure if the OS/Windows has some APIs or .Net classes to access raid ports and get their status? If so, how can I use PS to get the information? Do I have to reference to the dlls provided by the Intel Matrix Storage Manager if not? Basically, I would like to write a PS script to get read status. In case any of port disk is not normal, a message will be sent out by growl protocol.

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• Performance analysis strategies

  - by Bernd

  I am assigned to a performance-tuning-debugging-troubleshooting task. Scenario: a multi-application environment running on several networked machines using databases. OS is Unix, DB is Oracle. Business logic is implemented across applications using synchronous/asynchronous communication. Applications are multi-user with several hundred call center users at peak time. User interfaces are web-based. Applications are third party, I can get access to developers and source code. I only have the production system and a functional test environment, no load test environment. Problem: bad performance! I need fast results. Management is going crazy. I got symptom examples like these: user interface actions taking minutes to complete. Seaching for a customer usually takes 6 seconds but an immediate subsequent search with same parameters may take 6 minutes. What would be your strategy for finding root causes?

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• Sandbox solutions seem to be too severely crippled.

  - by Vaccano

  I am learning SharePoint and the different kind of solutions you can deploy. From the training I am watching it seems like you should try your best to use a Sandbox Solution when ever possible. This is because Farm Solutions can mess things up too much. However, two of the main things I would do with WebParts are not supported in Sandbox Solutions. Those are Visual WebParts and WebPart communication. (The first is not allowed because it needs to hit the file system and the second is disallowed because it uses reflection). It seems to me that my WebParts will always want to do at least one of those things. (WebParts that don't communicate are not really that modular are they?) Am I missing the point or are Sandbox Solutions a "nice idea" that are not really used in actual code?

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• Want to load jquery dialog from a different web-page

  - by Jake

  I'm a bit of a n00b with jquery so this one is probably an RTFM question: I'm writing an application to create a somewhat complex record for my client. Building the record requires doing a couple of server side searches inside a dialog. Right now I have everything framed up in 1 file (asp.net) and it's ok. But I can see as I add the business logic and the communication with the server this is going to get really ugly. I'm alreay putting most of the javascript in external files, but I'd like to move the HTML for the dialogs out too. How do I get the jquery dialog method to load the dialog body from the html files? Something like: getDialogHTML(dialogHolderDiv); <---magic goes here var dialogOptions = { ... }; $("#"+dialogHolderDiv).dialog(dialogOptions); $("#"+dialogHolderDiv).dialog('open'); any help will be apperciated .

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• What to look for in estimating a PowerBuilder Conversion Project?

  - by tekiegreg

  Hi there, I've been trying to do a spec for a PowerBuilder 9 to 11.5 migration of a relatively complex application. Granted PowerBuilder is not really my specialty I'm having issues trying to justify an estimate for this part of the project (and the PowerBuilder people I've been talking with have had some personal issues lately and are out of communication). These are some of the metrics that we have seen and can evaluate: -PBL Files -Main Windows -Data Windows -Functions (no we don't have the source available on this project) What metrics in particular are helpful and how long would any given "unit" such as a Data Window take?

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• How to fake source ip-address of a udp-packet?

  - by youllknow

  Hi everyone! Think about the following: Your ISP offers you a dynamic ip-address (for example 123.123.123.123). My question is simple (the answer may not): Is it possible to send a single udp-packet with a outer source-ip (for example 124.124.124.124) to a fixed-ip server? I don't need to get a answer from the server. I just want to know if/how this one way communication can be done, using a faked source-ip address. I'm sorry for my bad English! Thanks for you help in advance!

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• XNA, WPF light show visualizer

  - by Bgnt44

  HI all, I'm developing a software to control light show ( through DMX protocol ), i use C# and wpf to develop my main software (.net 4.0) To help people preview their show, i would like to make a live 3D visualizer... First, i thought that i could use wpf 3D to make the visualizer, but i need to work with light .. My main application should send property ( beam angle, orientation (X,Y), position(X,Y), Brush ( color,shape,effect)) to the 3D visualizer But i would like to be able to move light (position in the scene) by mouse during execution and had value in return... So .. Does XNA is the easiest way to doing that ? Can you help me for that : Generating light (orientation , bitmap like filter in front of light ) Dynamically moving object with mouse and get position in return Dynamically add or remove fixture All of your advice, sample, example are very welcome ... I don't espect to have a perfect result at the first time but i need to understand the main concepts for doing that Thank You !!

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• c++ smtp connection state - starttls

  - by Jackell

  Hi all! I am using openssl to build secure smtp connections to gmail.com:25. So I can successfully connect to the server and sends a command STARTTLS (I receive 220 2.0.0 Ready to start TLS). Then execute the following code without disconnecting: SSL_METHOD* method = NULL; SSL_library_init(); SSL_load_error_strings(); method = SSLv23_client_method(); ctx = SSL_CTX_new(method); if (ctx == NULL) { ERR_print_errors_fp(stderr); } SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2); ssl = SSL_new(ctx); if (!SSL_set_fd(ssl, socket)) { ERR_print_errors_fp(stderr); return; } if (ssl) { if (SSL_connect((SSL*)ssl) < 1) { ERR_print_errors_fp(stderr); } // then i think i need to send EHLO } But after calling SSL_connect I get an error: 24953:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:601: Why? What I do wrong?

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• How to implement a bidirectional "mailbox service" over tcp?

  - by igorgatis

  The idea is to allow to peer processes to exchange messages (packets) over tcp as much asynchronously as possible. The way I'd like it to work is each process to have an outbox and an inbox. The send operation is just a push on the outbox. The receive operation is just a pop on the inbox. Underlying protocol would take care of the communication details. Is there a way to implement such mechanism using a single TCP connection? How would that be implemented using BSD sockets and modern OO Socket APIs (like Java or C# socket API)?

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