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  • Portability among mobile platforms

    - by ElectricDialect
    Do any libraries or other development resources exist that can help reduce the effort involved in porting applications between various mobile platforms? In particular, I am interested in supporting iPhone, Android, and Windows Mobile. Some areas of concern include UI, client-server communication, and hardware support (e.g., camera, GPS, etc).

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  • JMS/DDS Integration

    - by dalenkruse
    I have a legacy C++ application that uses DDS for asynchronous communication/messaging. I need to integrate this application into a JavaEE environment that uses JMS for messaging. Other than building a standalone JMS/DDS bridge module, are there any other options that I might have?

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  • understanding json

    - by Yang
    JSON stands for JavaScript Object Notation. But how come languages like php, java, c etc can also communication each other with json. What I want to know is that, am i correct to say that json is not limited to js only, but served as a protocol for applications to communicate with each other over the network, which is the same purpose as XML?

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  • How to obtain a working X509Certificate for my WCF Service hosting

    - by Kobojunkie
    I am in the process of hosting my WCF services in my asp.net hosting account and I want to use X509Certificate for authentication of communication. Where do I get a certificate in this instance? Make one and then Ftp it to my account? If yes, how do I reference this certificate for use. If No, how do I get one for use please? Do I need to purchase one or something?

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  • problem with two .NET threads and hardware access

    - by mack369
    I'm creating an application which communicates with the device via FT2232H USB/RS232 converter. For communication I'm using FTD2XX_NET.dll library from FTDI website. I'm using two threads: first thread continuously reads data from the device the second thread is the main thread of the Windows Form Application I've got a problem when I'm trying to write any data to the device while the receiver's thread is running. The main thread simply hangs up on ftdiDevice.Write function. I tried to synchronize both threads so that only one thread can use Read/Write function at the same time, but it didn't help. Below code responsible for the communication. Note that following functions are methods of FtdiPort class. Receiver's thread private void receiverLoop() { if (this.DataReceivedHandler == null) { throw new BackendException("dataReceived delegate is not set"); } FTDI.FT_STATUS ftStatus = FTDI.FT_STATUS.FT_OK; byte[] readBytes = new byte[this.ReadBufferSize]; while (true) { lock (FtdiPort.threadLocker) { UInt32 numBytesRead = 0; ftStatus = ftdiDevice.Read(readBytes, this.ReadBufferSize, ref numBytesRead); if (ftStatus == FTDI.FT_STATUS.FT_OK) { this.DataReceivedHandler(readBytes, numBytesRead); } else { Trace.WriteLine(String.Format("Couldn't read data from ftdi: status {0}", ftStatus)); Thread.Sleep(10); } } Thread.Sleep(this.RXThreadDelay); } } Write function called from main thread public void Write(byte[] data, int length) { if (this.IsOpened) { uint i = 0; lock (FtdiPort.threadLocker) { this.ftdiDevice.Write(data, length, ref i); } Thread.Sleep(1); if (i != (int)length) { throw new BackendException("Couldnt send all data"); } } else { throw new BackendException("Port is closed"); } } Object used to synchronize two threads static Object threadLocker = new Object(); Method that starts the receiver's thread private void startReceiver() { if (this.DataReceivedHandler == null) { return; } if (this.IsOpened == false) { throw new BackendException("Trying to start listening for raw data while disconnected"); } this.receiverThread = new Thread(this.receiverLoop); //this.receiverThread.Name = "protocolListener"; this.receiverThread.IsBackground = true; this.receiverThread.Start(); } The ftdiDevice.Write function doesn't hang up if I comment following line: ftStatus = ftdiDevice.Read(readBytes, this.ReadBufferSize, ref numBytesRead);

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  • wcf and windows authentication

    - by darko petreski
    I like to use wcf (windows communication foundation) with windows authentication. Do I need Active directory for this purpose? How the server knows about the identity of the client? If someone can found out the pass of the client that is using the wcf services, can he create the same user name on different computer and use the password to access the wcf services ? Regards, Darko Petreski

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  • Data store for capturing votes & aggregating them

    - by Nathan de Vries
    I'm interested in using Node.js as a socket server for stream-based communication with tens of thousands of clients. Clients will be sending votes for particular pieces of content, and receiving near-realtime updates of aggregated vote tallies from the server. The datastore needs to support: Storing the votes Summarising the votes in near-realtime Preventing multiple votes within an arbitrary time period (e.g. clients can only vote once for a piece of content every 1 minute) Something that already has client libraries for Node.js would be preferable.

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  • Communicating to SAP XI through .NET - IDOC XML

    - by RAVI KOTA
    Hi Friends, I have a situation where in we need to send IDOC things to SAP XI from .NET application. It is like both sending and receiving. I guess that it is having something connected to translate IDoc to XML and vice versa and then communicate. Can you just some technical knowledge on how to achieve this communication between SAP XI and .NET for IDOCs Many thanks, Ravi Kota

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  • OpenNETCF 1.4 Vs OpenNETCF 2.3

    - by CF_Maintainer
    I have a chance to upgrade a legacy suite of applications currently using .net 1.1 to the newest .net framework. It uses OpenNETCF 1.4 to communicate with the mobile device. Is it worthwhile to upgrade from opennetCF ver 1.4 to ver 2.3 as well? Should I be expecting significant roadblocks/issues while doing so OR if anyone has already done the upgrade, is it painless and beneficial? The application utilizes Rapi from the OpenNETCF.Desktop.Communication The PDA applications run on Dell X51 and HP IPaQ series

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  • create a plugin in Delphi Prism using Hydra (Remobjects)

    - by simon
    Hi, I have to create a plugin in Delphi Prism for Application that is already in Delphi. I have read all about Hydra 3.0 in www.remobjects.com and have some queries. Can you please give me an example how to create custom Interfaces for communication between Delphi Host and .Net Plugin.(either in C# or Delphi Prism) what is the role of ModuleController in Hydra plugin and how it works there? Role of Manager Component? Many Thanks in Advance.

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  • Register all GUI components as Observers or pass current object to next object as a constructor argu

    - by Jack
    First, I'd like to say that I think this is a common issue and there may be a simple or common solution that I am unaware of. Many have probably encountered a similar problem. Thanks for reading. I am creating a GUI where each component needs to communicate (or at least be updated) by multiple other components. Currently, I'm using a Singleton class to accomplish this goal. Each GUI component gets the instance of the singleton and registers itself. When updates need to be made, the singleton can call public methods in the registered class. I think this is similar to an Observer pattern, but the singleton has more control. Currently, the program is set up something like this: class c1 { CommClass cc; c1() { cc = CommClass.getCommClass(); cc.registerC1( this ); C2 c2 = new c2(); } } class c2 { CommClass cc; c2() { cc = CommClass.getCommClass(); cc.registerC2( this ); C3 c3 = new c3(); } } class c3 { CommClass cc; c3() { cc = CommClass.getCommClass(); cc.registerC3( this ); C4 c4 = new c4(); } } etc. Unfortunately, the singleton class keeps growing larger as more communication is required between the components. I was wondering if it's a good idea to instead of using this singleton, pass the higher order GUI components as arguments in the constructors of each GUI component: class c1 { c1() { C2 c2 = new c2( this ); } } class c2 { C1 c1; c2( C1 c1 ) { this.c1 = c1 C3 c3 = new c3( c1, this ); } } class c3 { C1 c1; C2 c2; c3( C1 c1, C2 c2 ) { this.c1 = c1; this.c2 = c2; C4 c4 = new c4( c1, c2, this ); } } etc. The second version relies less on the CommClass, but it's still very messy as the private member variables increase in number and the constructors grow in length. Each class contains GUI components that need to communicate through CommClass, but I can't think of a good way to do it. If this seems strange or horribly inefficient, please describe some method of communication between classes that will continue to work as the project grows. Also, if this doesn't make any sense to anyone, I'll try to give actual code snippets in the future and think of a better way to ask the question. Thanks.

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  • Accessing SQL Data Services via ADO.NET Data Service Client Library

    - by Mehmet Aras
    Is this possible? Basically I would like to use SQL Data Services REST interface and let the ADO.NET Data Service Client library handle communication details and generate the entities that I can use. I looked at the samples in February release of Azure services kit but the samples in there are using HttpWebRequest and HttpWebResponse to consume SQL Data Services RESTfully. I was hoping to use ADO.NET Data Service Client library to abstract low-level details away.

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  • VS2010 Load Testing - Restricting ports

    - by marks-s
    As per the trouble shooting guide for VS2010 Load Testing (http://social.msdn.microsoft.com/Forums/en/vststest/thread/df043823-ffcf-46a4-9e47-1c4b8854ca13), I'm trying to restrict the range of ports used for client-controller communication. HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\VisualStudio\10.0\EnterpriseTools\QualityTools\ListenPortRange\PortRangeStart HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\VisualStudio\10.0\EnterpriseTools\QualityTools\ListenPortRange\PortRangeEnd I've set these keys on the client as described but according to netstat the client is still listening on random ports. The controller is attempting to communicate on the same random ports as the client. Anyone experienced the same?

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  • how to connect to ethernet printer throught python?

    - by Prasanth
    How can i connect and send data to a Ethernet receipt printer Epson-T88V through python2.7, i have set the ipaddress of the Ethernet printer manually and the utility software communication is also successful. How do i detect and connect to these printers and send data to print. Is there and module for Ethernet connection in python. Using more than one Ethernet printer and separate data to be printed simultaneously from a single system, i am using windows xp and python 2.7 hope i am clear Thanks.

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  • H.264 over RTP - Identify SPS and PPS Frames

    - by Toby
    I have a raw H.264 Stream from an IP Camera packed in RTP frames. I want to get raw H.264 data into a file so I can convert it with ffmpeg. So when I want to write the data into my raw H.264 file I found out it has to look like this: 00 00 01 [SPS] 00 00 01 [PPS] 00 00 01 [NALByte] [PAYLOAD RTP Frame 1] // Payload always without the first 2 Bytes -> NAL [PAYLOAD RTP Frame 2] [... until PAYLOAD Frame with Mark Bit received] // From here its a new Video Frame 00 00 01 [NAL BYTE] [PAYLOAD RTP Frame 1] .... So I get the SPS and the PPS from the Session Description Protocol out of my preceding RTSP communication. Additionally the camera sends the SPS and the PPSin two single messages before starting with the video stream itself. So I capture the messages in this order: 1. Preceding RTSP Communication here ( including SDP with SPS and PPS ) 2. RTP Frame with Payload: 67 42 80 28 DA 01 40 16 C4 // This is the SPS 3. RTP Frame with Payload: 68 CE 3C 80 // This is the PPS 4. RTP Frame with Payload: ... // Video Data Then there come some Frames with Payload and at some point a RTP Frame with the Marker Bit = 1. This means ( if I got it right) that I have a complete video frame. Afer this I write the Prefix Sequence ( 00 00 01 ) and the NALfrom the payload again and go on with the same procedure. Now my camera sends me after every 8 complete Video Frames the SPS and the PPS again. ( Again in two RTP Frames, as seen in the example above ). I know that especially the PPS can change in between streaming but that's not the problem. My questions are now: 1. Do I need to write the SPS/PPS every 8th Video Frame? If my SPS and my PPS don't change it should be enough to have them written at the very beginning of my file and nothing more? 2. How to distinguish between SPS/PPS and normal RTP Frames? In my C++ Code which parses the transmitted data I need make a difference between the RTP Frames with normal Payload an the ones carrying the SPS/PPS. How can I distinguish them? Okay the SPS/PPS frames are usually way smaller, but that's not a save call to rely on. Because if I ignore them I need to know which data I can throw away, or if I need to write them I need to put the 00 00 01 Prefix in front of them. ? Or is it a fixed rule that they occur every 8th Video Frame?

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  • realtime diagnostics

    - by Ion Todirel
    I have an application which has a loop, part of a "Scheduler", which runs at all time and is the heart of the application. Pretty much like a game loop, just that my application is a WPF application and it's not a game. Naturally the application does logging at many points, but the Scheduler does some sensitive monitoring, and sometimes it's impossible just from the logs to tell what may have gotten wrong (and by wrong I don't mean exceptions) or the current status. Because Scheduler's inner loop runs at short intervals, you can't do file I/O-based logging (or using the Event Viewer) in there. First, you need to watch it in real-time, and secondly the log file would grow in size very fast. So I was thinking of ways to show this data to the user in the realtime, some things I considered: Display the data in realtime in the UI Use AllocConsole/WriteConsole to display this information in a console Use a different console application which would display this information, communicate between the Scheduler and the console app using pipes or other IPC techniques Use Windows' Performance Monitor and somehow feed it with this information ETW Displaying in the UI would have its issues. First it doesn't integrate with the UI I had in mind for my application, and I don't want to complicate the UI just for this. This diagnostics would only happen rarely. Secondly, there is going to be some non-trivial data protection, as the Scheduler has it's own thread. A separate console window would work probably, but I'm still worried if it's not too much threshold. Allocating my own console, as this is a windows app, would probably be better than a different console application (3), as I don't need to worry about IPC communication, and non-blocking communication. However a user could close the console I allocated, and it would be problematic in that case. With a separate process you don't have to worry about it. Assuming there is an API for Performance Monitor, it wouldn't be integrated too well with my app or apparent to the users. Using ETW also doesn't solve anything, just a random idea, I still need to display this information somehow. What others think, would there be other ways I missed?

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  • Sending multiline message via sockets without closing the connection

    - by Yasir Arsanukaev
    Hello folks. Currently I have this code of my client-side Haskell application: import Network.Socket import Network.BSD import System.IO hiding (hPutStr, hPutStrLn, hGetLine, hGetContents) import System.IO.UTF8 connectserver :: HostName -- ^ Remote hostname, or localhost -> String -- ^ Port number or name -> IO Handle connectserver hostname port = withSocketsDo $ do -- withSocketsDo is required on Windows -- Look up the hostname and port. Either raises an exception -- or returns a nonempty list. First element in that list -- is supposed to be the best option. addrinfos <- getAddrInfo Nothing (Just hostname) (Just port) let serveraddr = head addrinfos -- Establish a socket for communication sock <- socket (addrFamily serveraddr) Stream defaultProtocol -- Mark the socket for keep-alive handling since it may be idle -- for long periods of time setSocketOption sock KeepAlive 1 -- Connect to server connect sock (addrAddress serveraddr) -- Make a Handle out of it for convenience h <- socketToHandle sock ReadWriteMode -- Were going to set buffering to LineBuffering and then -- explicitly call hFlush after each message, below, so that -- messages get logged immediately hSetBuffering h LineBuffering return h sendid :: Handle -> String -> IO String sendid h id = do hPutStr h id -- Make sure that we send data immediately hFlush h -- Retrieve results hGetLine h The code portions in connectserver are from this chapter of Real World Haskell book where they say: When dealing with TCP data, it's often convenient to convert a socket into a Haskell Handle. We do so here, and explicitly set the buffering – an important point for TCP communication. Next, we set up lazy reading from the socket's Handle. For each incoming line, we pass it to handle. After there is no more data – because the remote end has closed the socket – we output a message about that. Since hGetContents blocks until the server closes the socket on the other side, I used hGetLine instead. It satisfied me before I decided to implement multiline output to client. I wouldn't like the server to close a socket every time it finishes sending multiline text. The only simple idea I have at the moment is to count the number of linefeeds and stop reading lines after two subsequent linefeeds. Do you have any better suggestions? Thanks.

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  • error to send SMS

    - by deni
    i have a problem with that code.. i got a error when i execute CommSetting.comm.SendMessage(pdu); the error is Phone reports generic communication error or syntax error can u tell me how to solve my problem?? thx i develop with c#, VS 2008

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  • stunnel on window for IBM MQ connection

    - by user171523
    Does anyone have an experience or just thoughts about securing MQ TCP communication channels using stunnel? I am integration with third party S.W which has MQ support built in but it can not support SSL. So to have some kind of security over the TCP we would like to use stunnel. Does any one have any thoughts how to implement and any best practices

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