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  • java I/O is blocked while reading on socket when i put off the battery from device.

    - by gunjan goyal
    hi, i m working on client socket connection. client is a GPRS hardware device. i m receiving request from this client on my serversocket and then opening multiple threads. my problem is that when device/client close the socket then my IO detects that throws an exception but when i put off the battery from the device while sending the request to the serversocket it is blocked without throwing any exception. please help me out. thanks in advance. this is my code. try { while ((len = inputStream.read(mainBuffer)) -1) { System.out.println("len= " + len); }//end of while System.out.println("out of while loop");//which is never printed on screen. } catch (IOException e) { e.printStackTrace(); } regards gunjan goyal

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  • NSURLConnection on simulator and iphone performance issues

    - by Nava Carmon
    I'm experiencing a weird problem and i wonder if anybody else has noticed this: I'm using NSURLConnection as it appears in apple's examples to get xml files from a certain server - pretty straight forward. And most of time it works, but sometimes it's just stuck after initialing and don't get into connection's delegate methods. I'm working with WiFi & 3G and the same server all the time. When it comes to didFailWithError i see that mostly it was a timeout error. When I enter same link in Safari it takes a second to bring data. And after another trial I can access the link. What might be the reason for such a weird behavior? How can I improve it? What is the role of cache policy with NSURLConnection? Thanks, Nava

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  • How to specify numeric width and precision when creating a dBase database?

    - by Stevo3000
    We need to be able to create a dBase database (.dbf file) containing numeric columns with specific width and precision. I seem to be able to set the precision but not the width. The following code shows my connection string and my command text. using (OleDbConnection oConnection = new OleDbConnection(String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source = {0};Extended Properties=dBase 5.0", msPath))) { .... oCommand.CommandText = "CREATE TABLE [Field] ([Id] Numeric (15, 3))"; oCommand.ExecuteNonQuery(); } This gives me a column Id,20,3 in the file. There must be a way to set the field width without resorting to editing the .dbf file manually? Has nobody else come across this before when creating shapefiles?

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  • DBMS for POS software

    - by Andrew Smith
    Hello, I want to develop a POS application in .NET (C#) that would be used to rent items. I have a good idea of what will be done and the famous question that I have is about the DBMS that I should use. I would like to use MySQL database. The question is: If some places use only one computer (no network, no internet connection), can I use a MySQL database in local? Do I need to install MySQL server on all thoses computers to be able to use such a database? I know SQLite but I'm not sure if the limitations can cause problems in the future... I also looked at SQLServer Express versions. (I must consider that other point of sales are using multiple computers and more transactions so there I can't put sqlexpress or sqlite) So can anybody suggest me what I should do in that situation? Thanks

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  • can't run a scala script on Mac OS X

    - by wataradio
    Running a scala script on Mac OS X results in the following error: Unable to establish connection to compilation daemon I googled and found a page reported the same problem: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=576568 To solve the problem, the page said: Can you please tell what does /etc/sysctl.d/bindv6only.conf contain? If the value is 1, can you try to: 1) sudo sed -i 's/net.ipv6.bindv6only\ =\ 1/net.ipv6.bindv6only\ =\ 0/' \ /etc/sysctl.d/bindv6only.conf && sudo invoke-rc.d procps restart 2) Then, run scala/fsc as usual and see if the bug is still there. But I can't find a bindv6only.conf in my Mac OS X. How can I solve the problem? -- System Information: Scala version 2.7.7.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_20) Mac OS X 10.6.3

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  • Using LINQ to query database through a proxy server of some kind?

    - by Mustafakidd
    Hey All Sorry for using (perhaps) the wrong lingo, but my question may be clearer if you view this diagram as you read it. http://dl.dropbox.com/u/13256/DIAGRAM.PNG Our client is requiring us to adhere to the server configuration (poorly) diagrammed in the above image. The web server is accessible over port 80 and is where our web application is hosted - a second firewall permits this web server to access a second server which in turn is the only server permitted to access the database server. My question is: How do I deploy a web application that uses LINQ-to-SQL in this environment? Is there a way to proxy my LINQ queries through the app server so that the database connection goes through that server? This is uncharted territory for me, as we always have had access to the DB server directly from our web server in the past. Any help is appreciated. Thanks Mustafa

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  • Are there any good Java API for facebook?

    - by Kamikaze Mercenary
    I've played around a bit with twitter4j and found it absolutely wonderful. Now I've been looking into the equivalent for facebook but so far haven't had much luck finding a decent project. I looked into facebook-java-api but it appears that they break their API from release to release. I consider this unacceptable. I'm currently playing around a bit with RestFB and the API seems decent so far but I've been having some connection problems. I'm just looking for a simple library that lets me post status updates, send direct messages and get a list of friends through minimal coding effort. Has anyone had any success using a java API for facebook and if so, what are you using? Thanks.

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  • BDE, Delphi, ODBC, SQL Native Client & Dead lock

    - by EspenS
    Hi. We have some Delphi code that uses the BDE to Access SQL Server 2008 through the SQL Server Native Client ODBC driver (2005 version). Our issue is that we're experiencing some deadlock issues in a loop doing inserts to multiple tables. The whole loop is done within a [TDatabase].StartTransaction. Looking at the SQL Server Profiler we clearly see that at one point during the loop the SPID (Session ID?) change, and then we naturally end up with a deadlock. (Both SPID doing inserts to the same table) It seems like the BDE at some point does a second connection to the DB... (Although I would love to skip the BDE, it's currently not possible. ) Anyone with experiences to share?

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  • Fast single thread comet server, possible?

    - by Pepijn
    I recently encountered a few cases where a server would distribute an event stream that contains the exact same data for all listeners, such as a 'recent activity' box. It occurred to me that it is quite strange and inefficient to have a server like Apache run a thread processing and querying the database for every single comet stream containing the same data. What I would do for those global(not per user) streams is run a single thread that continuously emits data, and a new (green)thread for every new request that outputs the headers and then 'merges' into the main thread. Is it possible for one thread to serve multiple sockets, or for multiple clients to listen to the same socket? An example o = event # threads received | a b # 3 o / / # 3 - |/_/ | # 1 o c # 2 a, b | / o/ # 2 a, b o # 1 a, b, c | # connection b closed o # 1 a, c Does something like this exist? Would it work? Is it possible to do? Disclaimer: I'm not a server expert.

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  • python socket.recv/sendall call blocking

    - by fsm
    Hi everyone. This post is incorrectly tagged 'send' since I cannot create new tags. I have a very basic question about this simple echo server. Here are some code snippets. client while True: data = raw_input("Enter data: ") mySock.sendall(data) echoedData = mySock.recv(1024) if not echoedData: break print echoedData server while True: print "Waiting for connection" (clientSock, address) = serverSock.accept() print "Entering read loop" while True: print "Waiting for data" data = clientSock.recv(1024) if not data: break clientSock.send(data) clientSock.close() Now this works alright, except when the client sends an empty string (by hitting the return key in response to "enter data: "), in which case I see some deadlock-ish behavior. Now, what exactly happens when the user presses return on the client side? I can only imagine that the sendall call blocks waiting for some data to be added to the send buffer, causing the recv call to block in turn. What's going on here? Thanks for reading!

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  • Client Web Service call over SSL using Apache Axis

    - by java_pill
    I'm using Apache Axis 1.5.1 to code a web service client connecting to a service over SSL. My application is running in Tomcat with SSL configuration setup in JKS. However, when I connect to the server, the connection is failing because the cert from our client is not being sent to the server. Is this something that has to be set in the client through code? Also note that the server does not need any user name or password authentication. With SSL turned off, everything works fine. Thanks,

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  • copy file from unix system to windows using ant

    - by vishu
    can any one help me how to copy file from unix Windoes system to windows UNIX using ant? Thanks in advance EDIT Let me explain in detail what I am looking for I want to copy file from windows to unix machine (correcting my previous question not from unix to windows) using ANT. I thought of using ftp task. Before that as a check I tried to ftp unix sever from windows but it gave connection refused error(Do I need to provide my username and password,if that is the case what is the syntax). But I am able to connect through putty which asks for my user name and password. Does putty uses a different protocol. So if that is the case does ftp task works for me in ANT?. If not what task I need to use?

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  • redis timeout with predis

    - by Patrick
    Hello, I'm using redis with php (predis at http://github.com/nrk/predis/) and am experiencing frequent timeout. The stack trace shows: [04-Apr-2010 03:39:50] PHP Fatal error: Uncaught exception 'Predis_ClientException' with message 'Connection timed out' in redis.php:697 Stack trace: #0 redis.php(757): Predis_Connection->connect() #1 redis.php(729): Predis_Connection->getSocket() #2 redis.php(825): Predis_Connection->writeCommand(Object(Predis_Commands_ListRange)) #3 redis.php(165): Predis_ConnectionCluster->writeCommand(Object(Predis_Commands_ListRange)) #4 redis.php(173): Predis_Client->executeCommandInternal(Object(Predis_ConnectionCluster), Object(Predis_Commands_ListRange)) #5 redis.php(157): Predis_Client->executeCommand(Object(Predis_Commands_ListRange)) #6 [internal function]: Predis_Client->__call('lrange', Array) This happens consistently and I have no idea why. Anyone has any idea?

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  • Pushing data once a URL is requested

    - by Eli Grey
    Given, when a user requests /foo on my server, I send the following HTTP response (not closing the connection): Content-Type: multipart/x-mixed-replace; boundary=----------------------- ----------------------- Content-Type: text/html <a href="/bar">foo</a> When the user clicks on foo (which will send 204 No Content so the view doesn't change), I want to send the following data in the initial response. ----------------------- Content-Type: text/html bar How would could I get the second request to trigger this from the initial response? I'm planning on possibly creating a fancy [engines that support multipart/x-mixed-replace (currently only Gecko)]-only email webapp that does server-push and Ajax effects without any JavaScript, just for fun.

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  • printing sequence number of a sniffed packet

    - by scatman
    i am using pcap to create a packet sniffer. i have this tcp structure: typedef struct TSP_header{ unsigned short int sport; unsigned short int dport; unsigned int seqnum; unsigned int acknum; unsigned char reserved:4, offset:4; unsigned int tcp_res1:4, //little-endian tcph_hlen:4, //length of tcp header in 32-bit words tcph_fin:1, //Finish flag "fin" tcph_syn:1, //Synchronize sequence numbers to start a connection tcph_rst:1, //Reset flag tcph_psh:1, //Push, sends data to the application tcph_ack:1, //acknowledge tcph_urg:1, //urgent pointer tcph_res2:2; unsigned short int tcph_win; unsigned short int tcph_chksum; unsigned short int tcph_urgptr; }TSP_header; how can i print the sequence number? shou i use htons(sequence_number)?? coz it isn't working this way!!

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  • Using comet with PHP?

    - by ryeguy
    I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet: My understanding is that PHP is a terrible language for Comet, because Comet requires you to keep a persistent connection open to each browser client. Using mod_php this means tying up an Apache child full-time for each client which doesn’t scale at all. The people I know doing Comet stuff are mostly using Twisted Python which is designed to handle hundreds or thousands of simultaneous connections. Is this true? Or is it something that can be configured around?

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  • Can anyone give me a sample DSP script in C/C++

    - by Andrew
    Im working on a (Audio) DSP project and just wondering if there are any sample (Open source) DSP example that are written in c or c++, for my MSP430 Chip. I just want something as a guideline so i can program my own script using the ACD and DCA on my board for sampling. http://focus.ti.com/docs/toolsw/folders/print/msp-exp430f5438.html Thats my board, MSP430F5438 Experimenter Board, from what i herd it can run dsp script via the USB connection with the computer. Im using CCS ( From TI, code composer studio) and Octave/Matlab. Just any DSP example scripts or sites that will help me create my own would be appreciated. What im tying to do, Partial audio (sampled) track -- Nyquist rate sampling -- over- and undersampling -- reconstruction of the audio track.

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  • ipad dev - in the UISplitViewController template, how is the method setDetailItem called?

    - by Brian
    I am developing an ipad app which has a UISplitViewController. (I use IB to build the interface, but I do not use the template) Both master and detail (left and right) views are navigationController. The left view subclass UITableView and the right view should push another controller if the cell on the left is selected. I don't know how to make my detail view responds to my master view. Also, in the template, the detailViewController has a id detailItem and a method setDetailItem. How are these two connected? I cannot see any connection between but setDetailItem is called when detailViewController.detailItem is being called. Thanks in advance.

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  • Logging which is the best way

    - by Tony
    Hi People who talk about loggers here never talke about EventLog, I think this is good for windows system. Is it reliable, or I found it dead in some bad morning? Why not logging everything at SQLServer, I am creating E-Commerce website, if SQL server down the website will be down anyway. but I am worry about temporally connection failure, what do u think? Why everyone like files, it can be in great size, too big to handle, or maybe I will create another file when a file is too big, and I can create a file with a date. Some one tried MS Enterprise library? talk to me about it. Thanks

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  • Smooth screen recording software

    - by user85658
    Hello everyone, I am preparing for my senior thesis presentation. I'd like to back myself up in case there is no internet connection available. Therefore I want to record a video showing the functionality of my software. I have tried Camtasia but all the smooth and slick animations I've created, do not look that appealing. Is there an alternative. Something that will capture my screen 1 to 1, or near that. Camtasia is great, but it does not serve the purpose. Any help would be greatly appreciated. Best Regards, Kiril

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  • Does any one know of a packet generator?

    - by Benoit
    We have a networked device, and we would like to perform some tests on how it handles malformed packets. Is there a product out there that can generate arbitrary packets and packet sequences? I would like to be able to specify a set of TCP/IP payloads and it would open a connection and send the data. Obviouly, the TCP/IP checksum should be calculated correctly, etc... Kind of like a wireshark in reverse. Note that I am not interested in network loading and blasting millions of packet.

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  • Doctrine2 Mutliple DBs without Symfony2?

    - by ehime
    Hey guys I know that using the Doctrinebundle in Symfony2 it is possible to instantiate multiple DB connections under Doctrine... $connectionFactory = $this->container->get('doctrine.dbal.connection_factory'); $connection = $connectionFactory->createConnection(array( 'driver' => 'pdo_mysql', 'user' => 'foo_user', 'password' => 'foo_pass', 'host' => 'foo_host', 'dbname' => 'foo_db', )); I'm curious if this is the case if you are using PURELY Doctrine though?, I've set up Doctrine via Composer like so... { "config": { "vendor-dir": "lib/" }, "require": { "doctrine/orm": "2.3.4", "doctrine/dbal": "2.3.4" } } And have been looking for my ConnectionFactory class but am not seeing it anywhere? Am I required to use Symfony2 to do this? Thanks!

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  • Autotesting a network interface

    - by Machado
    Hi All, I'm developing a software component responsible for testing if a network interface has conectivity with the internet. Think of it as the same test the XBOX360 does to inform the user if it's connected with the Live network (just as an example). So far I figured the autotest would run as this: 1) Test the physical network interface (if the cable is conected, has up/downlink, etc...) 2) Test the logical network (has IP address, has DNS, etc...) 3) Connects to the internet (can access google, for example) 4) ??? 5) Profit! (just kidding...) My question relates to step 3: How can I detect, correctly, if my software has connection with the internet ? Is there any fixed IP address to ping ? The problem is that I don't want to rely solely on google.com (or any other well-known address), as those can change in time, and my component will be embbeded on a mobile device, not easy to update. Any suggestions ?

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  • Ruby Socket Inheritance

    - by Jarsen
    I'm writing a Ruby class that extends TCPSocket. Assume it looks something like this: class FooSocket < TCPSocket def hello puts 'hello' end end I have a TCPServer listening for incoming connections server = TCPServer.new 1234 socket = server.accept When my server finally accepts a connection, it will return a TCPSocket. However, I want a FooSocket so that I can call socket.hello. How can I change TCPSocket into a FooSocket? I could duck-punch the methods and attributes I want directly onto the TCPSocket class, but I'm using it elsewhere and so I don't want to do that. Probably the easiest solution is to write a class that encapsulates a TCPSocket, and just pass the socket returned by accept as a param. However, I'm interested to know how to do it through inheritance—I've been trying to bend my mind around it but can't figure it out. Thanks in advance.

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  • Try all available WSDL IPs with JAX-WS

    - by Asaf
    I'm using JAX-WS to open a service port. When the DNS exposes two IPs for the DNS entry (of the WSDL), the Service tries to use only the first - resulting in a "Failed to access the WSDL at: http://some.url.com/someDocument?wsdl. It failed with: Connection refused: connect" exception. I've found an issue filed against JAX-WS, but with no resolution. this is the comment that describes my problem best. The code is just a one-liner: Service service = Service.create("http://some.url.com/someDocument?wsdl", engineQName); the smarts is exposing those two A records on http://some.url.com/ at the DNS. Can anyone help? 10x,

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