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• WebSocket support on mobile devices

  - by Marco W.

  For an Android multiplayer game's communication between players I'm using a WebSocket server and TooTallNate's Java library on the client side to enable WebSocket support in the Android app. So just to point it out clearly, WebSocket support in mobile browsers is not important to me. Unfortunately, users report that they're experiencing problems such as connection failures or unreceived messages. Is that a general problem of WebSockets on mobile devices (blocked ports, firewalls, mobile Internet connection) or is that probably a flaw in the client side code? Do you have experience with WebSocket client libraries such as the one above? I've just discovered autobahn.ws for Android - but I don't know if it's worth switching from my current library (see above). What about WAMP? Is WebSocket technology not exactly the adequate solution so that I should use the sub-protocol (?) WAMP?

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• MySQL query killing my server

  - by Webnet

  Looking at this query there's got to be something bogging it down that I'm not noticing. I ran it for 7 minutes and it only updated 2 rows. //set product count for makes $tru->query->run(array( 'name' => 'get-make-list', 'sql' => 'SELECT id, name FROM vehicle_make', 'connection' => 'core' )); while($tempMake = $tru->query->getArray('get-make-list')) { $tru->query->run(array( 'name' => 'update-product-count', 'sql' => 'UPDATE vehicle_make SET product_count = ( SELECT COUNT(product_id) FROM taxonomy_master WHERE v_id IN ( SELECT id FROM vehicle_catalog WHERE make_id = '.$tempMake['id'].' ) ) WHERE id = '.$tempMake['id'], 'connection' => 'core' )); } I'm sure this query can be optimized to perform better, but I can't think of how to do it. vehicle_make = 45 rows taxonomy_master = 11,223 rows vehicle_catalog = 5,108 rows All tables have appropriate indexes

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• New Solaris 11 Customer Maintenance Lifecycle blog

  - by user12244672

  Hi Folks, On the basis that you can't have too much of a good thing, I've started a 2nd blog, the Solaris11Life blog , to enable me to blog about all aspects of the Solaris 11 Customer Maintenance Lifecycle, including policies, best practices, resource links, clarifications, and anything else which I hope you may find useful. In my first post, I share my Solaris 11 Customer Maintenance Lifecycle presentation, which I gave at Oracle Open World and the recent Deutsche Oracle Anwendergruppe (DOAG) conference. I'll be posting lots more there in the coming week as time allows, including secret handshake stuff on how to interpret IPS FMRI version strings. In future, I'll post any Solaris 11 Customer Maintenance Lifecycle related material on the Solaris11Life blog, http://blogs.oracle.com/Solaris11Life , and any Solaris 10 or below material here on the Patch Corner blog, http://blogs.oracle.com/patch . Best Wishes, Gerry.

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• How to change a Datasource's username/password at runtime in a J2EE app?

  - by Toto

  I've deployed a web-module which connects to the database via a datasource configured in the J2EE application server. Currently, the user/password for the database connection is set in the proper J2EE application server's datasources configuration file. I want to change during runtime the datasource's user/password. (e.g.: implement a new web form in which the user is asked to enter de user/password to be used in the database connection). Is there a standard way to do that in J2EE applications or it depends on the J2EE application server? In this case I'm using Orion application server.

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• cURL PHP Proper SSL between private servers with self-signed certificate

  - by PolishHurricane

  I originally had a connection between my 2 servers running with CURLOPT_SSL_VERIFYPEER set to "false" with no Common Name in the SSL cert to avoid errors. The following is the client code that connected to the server with the certificate: curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE); curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2); However, I recently changed this code (set it to true) and specified the computers certificate in PEM format. curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE); curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2); curl_setopt($ch,CURLOPT_CAINFO,getcwd().'/includes/hostcert/Hostname.crt'); This worked great on the local network from a test machine, as the certificate is signed with it's hostname for a CN. How can I setup the PHP code so it only trusts the hostname computer and maintains a secure connection. I'm well aware you can just set CURLOPT_SSL_VERIFYHOST to "0" or "1" and CURLOPT_SSL_VERIFYPEER to "false", but these are not valid solutions as they break the SSL security.

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• Wireless barcode scanner

  - by Zinx

  Hi All, I have 2 wireless barcode scanners. I have created an application in C# which reads a barcode and sends data to a web service which then manipulates the data and do further processing. When I start aplication, it first tries to connect to web service and will proceed further only if connection succeded. The problem I am facing is, if I deploy the application through visual studio then it works fine and connects to web service. But if I just copy the contents (exe and config files) manually, then it gives error that unknown host name. Can someone please help me to understand how this connection works? Does it needs some special settings in scanner device which visual studio does automatically while deployment? Thanks and Cheers.

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• How to make the switch to C++11?

  - by Overv

  I've been programming in C++ for a while now, but mostly thinks centered around the low-level features of C++. By that I mean mostly working with pointers and raw arrays. I think this behavior is known as using C++ as C with classes despite me only having tried C recently for the first time. I was pleasantly surprised how languages like C# and Java hide these details away in convenient standard library classes like Dictionaries and Lists. I'm aware that the C++ standard library has many convenience containers like vectors, maps and strings as well and C++11 only adds to this by having std:: array and ranged loops. How do I best learn to make use of these modern language features and which are suitable for which moments? Is it correct that software engineering in C++ nowadays I'd mostly free of manual memory management? Lastly, which compiler should I use to make the most of the new standard? Visual Studio has excellent debugging tools, but even VS2012 seems to have terrible C++11 support.

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• python interactive web data/forms/interface communicating with remote server

  - by decipher

  What's an efficient method (preferably simple as well) for communicating with a remote server and allowing the user to 'interact' with it (IE submit commands, user interface) via the web browser (IE a text box to input commands, and an text area for output, or various command-less abstracted interfaces)? I have the 'standalone' python code finished for communicating and working(terminal/console based right now). My primary concern is with re-factoring the code to suite the web, which involves establishing a connection (python sockets), and maintaining the connection while the user is logged on. some further details: currently using django framework for the basic back end/templates.

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• iPhone, I can send accelerometer data via wifi only 248 lines

  - by newbie

  I have created one application on iPhone. I build an application that gather accelerometer value and pass this value to c# server in realtime via wifi connection. I use NSStream with IP and port number. I was working perfectly, but now I realize that it stops after fetch value only 248 lines. I tried to write this value in text file locally on iPhone. I can obtain more than 260 lines of data. Therefore, I suspect that it has some limitation or other problems on NSStream of wifi connection.

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• How to retrieve email from GMail account using PHP?

  - by Tatu Ulmanen

  Hi, I'm trying to automatically retrieve some email from my GMail account for further parsing, but I can't get my head around on how to do that. I've searched the internets and it suggested that I use PHP's imap functions, like this: $server = '{imap.gmail.com:993/ssl}'; $connection = imap_open($server, '[email protected]', 'password'); But using that code, I get: Warning: imap_open() [function.imap-open]: Couldn't open stream {imap.gmail.com:993/ssl} Any idea what I am doing wrong? Any server setting that might be preventing me from making a connection to GMail (I'm using a shared service)? Is the address even right? Has anyone ever managed to do something like this? I've found tons of examples on how to send email via GMail, but very little of retrieving. Any help is much appreciated.

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• Navigation Bar from database

  - by KareemSaad

  i had soulation .i want to make navigation bar with items i will select them as (category,Product,....) So i made stored to get them throught paramater will pass it,s value from query string as. ALTER Proc Navcategory ( @Category_Id Int ) As Select Distinct Categories.Category,Categories.Category_Id From Categories Where Category_Id=@Category_Id and i mentioned in cs as if (Request.QueryString["Category_Id"] != null) { Banar.ImageUrl = "Handlers/Banner.ashx?Category_Id=" + Request.QueryString["Category_Id"] + ""; using (SqlConnection conn = Connection.GetConnection()) { SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandType = CommandType.StoredProcedure; cmd.CommandText = "Navcategory"; cmd.Parameters.Add(Parameter.NewInt("@Category_Id", Request.QueryString["Category_Id"])); SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { LblNavigaton.Visible = true; LblNavigaton.Text = dr["Category"].ToString(); } } } so the result will be ex. Fridge (Category when querstring(category_Id)) 4Door (Product when querystring (Product_Id)) But I want the result fridge4Door.......

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• accessing pdf via https URL

  - by Paul

  I send out a newsletter email containing URLs to a https website that then redirects to a pdf document. On first invocation of a URL the user is prompted with the typical https browser "security alert" popup, on selecting "Yes" the display of the PDF fails. The HTTP Header on the failed response is: HTTP/1.1 200 OK Server: ECS/HTTP-Server Date: Tue, 16 Mar 2010 15:57:26 GMT Content-type: application/pdf Content-language: en-US Set-cookie: JSESSIONID=0000r111cRz1Vc-PtCJg8Cdu4eR:-1; Path=/ Expires: Thu, 01 Dec 1994 16:00:00 GMT Cache-control: no-cache="set-cookie, set-cookie2" Connection: close Subsequent invocations of the URL successfully opens the PDF (at this point we have the session id cookie set by the initial failed request). The HTTP Header on the successful response is: HTTP/1.1 200 OK Server: ECS/HTTP-Server Date: Tue, 16 Mar 2010 16:53:03 GMT Content-type: application/pdf Content-language: en-US Connection: close The email client is Lotus Notes 6.5 which launches an IE6 browser Any ideas?

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• System net web exception when the system is connected for a while.

  - by Sharpeye500

  Hi, I have a asp.net application connecting to a .net web service, whenever i login & reach the main page, web services returns me back the data. But if i login for may be more than 1 or 2hrs, when i click any of the links i get: "System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond" What is the fix for this? Thanks.

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• Reading HttpURLConnection InputStream - manual buffer or BufferedInputStream?

  - by stormin986

  When reading the InputStream of an HttpURLConnection, is there any reason to use one of the following over the other? I've seen both used in examples. Manual Buffer: while ((length = inputStream.read(buffer)) > 0) { os.write(buf, 0, ret); } BufferedInputStream is = http.getInputStream(); bis = new BufferedInputStream(is); ByteArrayBuffer baf = new ByteArrayBuffer(50); int current = 0; while ((current = bis.read()) != -1) { baf.append(current); } EDIT I'm still new to HTTP in general but one consideration that comes to mind is that if I am using a persistent HTTP connection, I can't just read until the input stream is empty right? In that case, wouldn't I need to read the message length and just read the input stream for that length? And similarly, if NOT using a persistent connection, is the code I included 100% good to go in terms of reading the stream properly?

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• SQL Server 2008 - cannot register default instance MSSQLSERVER

  - by Paul Moss

  Hello, I have installed SQL Server 2008 Developer on Windows 7 64 bit. In Management Studio I cannot register the default instance MSSQLSERVER, it cannot find it although the service is running. I get the message: Cannot connect to PHOENIX\MSSQLSERVER. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid) (Microsoft SQL Server, Error: 87) However Management Studio does show the SQL Server 2005 Express instance (that was installed with VS 2008 Pro) which appeared as already registered. I an using Windows Authentication as I installed it in mixed mode. Any ideas would be appreciated, many thanks paul

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• ssh script gives "key_read" error

  - by lugte098

  I'm using a script that connects to a cluster through ssh and sends some commands, then quits the connection. This script basically connects once using ssh, then executes a script in this session. This script loops through a list of commands a few times and after it is finished, the connection is terminated. So this script works fine, except for the fact that after a few loops it gives me the following error at loop 22. And then again at loop 32. The loops do exactly the same thing, so i cannot grasp the problem the script is facing. This is the error: key_read: uudecode AAAAB3NzaC1yc2EAAAABIwAAAQEAxmNx2hcXLpTjuaa3yKC3B9gbF7KprP2/ CH8fBgMbCyIcOB+ZMQDmEnbVTqedBwV/mxjZzorEpHTM8MX2WsTjFsxwzDgcpuxm+3cwfb0WSy9Y4Kb F8crAsRDbBIpUZ2n/iSdRcds9nTjk6PA61kTS24RLACHpqF18vudlO5WcbCOnAwa+DdUs0Raw29UiQc BaC6M4YPnApq9Ayy7a6qFI2uK6efkwfLTZIDivWlIdLpRLEyuBEpozQQhEd0mrGhR/ Gl1GevRvFMms14130xQ4A5UpJSn6CmrRIWBkcgp1TilqDGQ1F5xZOinnc4C00gFrbT3hkkQqY5A9p node023,10.141.0.31 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAxmNx2hcXLpTjuaa3yKC3 B9gbF7KprP2/CH8fBgMbCyIcOB+ZMQDmEnbVTqedBwV/mxjZzorEpHTM8MX2WsTjFsxwzDgcpuxm+ 3cwfb0WSy9Y4KbF8crAsRDbBIpUZ2n/iSdRcds9nTjk6PA61kTS24RLACHpqF18vudlO5WcbCOnAw a+DdUs0Raw29UiQcBaC6M4YPnApq9Ayy7a6qFI2uK6efkwfLTZIDivWlIdLpRLEyuBEpozQQhEd0m rGhR/Gl1GevRvFMms14130xQ4A5UpJSn6CmrRIWBkcgp1TilqDGQ1F5xZOinnc4C00gFrbT3hkkQqY5 A9pa0lQHFkSw==

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• TCPClient in C# (Error).

  - by CSharp

  using System; using System.Text; using System.IO; using System.Net.Sockets; namespace ConsoleApp01 { class Program { public static void Main(string[] args) { TcpClient client = new TcpClient("python.org",80); NetworkStream ns = client.GetStream(); StreamWriter sw = new StreamWriter(ns); sw.Write("HEAD / HTTP/1.1\r\n" + "User-Agent: Test\r\n" + "Host: www.python.org\r\n" + "Connection: Close\r\n"); sw.Flush(); Console.ReadKey(true); } } } System.Net.Sockets.SocketException: Unable to make a connection because the target machine actively refused it at System.Net.Sockets.TcpClient..ctor at ConsoleApp01.Program.Main :line 12 Why do i get this error message?

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• How to program something with the expectation that it will work the first time?

  - by Peter Turner

  I had a friend in college who programmed something that worked the first time, that was pretty amazing. But as for me, I just fire up the debugger as soon as I finally get whatever I'm working on to compile - saves me time (kidding of course, I sometimes hold out a little bit of hope or use a lot of premeditated debug strings). What's the best way to approach the Dijkstrain ideal for our programs? -or- Is this just some sort of pie-in-the-sky old fools quest for greatness applicable only to finite tasks that no one should hope for in our professional lives because programming is just too complex?

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• Finding "spare time" in a day from within a list of events

  - by MFB

  I have a list of events which is always sorted chronologically. The start time is always followed by the end time. Times are strings formatted as 'HHmmss'. // list of events var events = [ '010000', // start '013000', // end... '053000', '060000', '161500', '184500'] // desired output var spares = [ '000000', // start '010000', // end... '013000', '053000', '060000', '161500', '184500', '235959'] How can I programmatically create a new list of "spare time" from 000000 to 235959? PS I'm trying to do this in Javascript, but any conceptual answer or pseudo code would be helpful too.

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• Transferring Data Directly between 2 Connections in Indy (TIdContext)

  - by killercode

  ive a sever running TIdTCPServer, and Client Using Web Browser (or any other software) to Communicate, i dunno the protocol, but what im trying to do is to Send The Data between the client and another Connection (Both Connected to the same TIdTCPServer) for example the data sent by the first client is transmitted to the second client, and the data sent by the second client is transmitted to the first client, like a proxy (i cant really use a proxy server since its just this one condition) and the TIdTCPServer should still be receiving other clients and processing their data. i stumbled upon the first line of code, since TIdContext.Connection.Socket.ReadLn requires a Delimiter, and the Client's Protocol is unknown to the server. any ideas? thanks.

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• libcurl - unable to download a file

  - by marmistrz

  I'm working on a program which will download lyrics from sites like AZLyrics. I'm using libcurl. It's my code lyricsDownloader.cpp #include "lyricsDownloader.h" #include <curl/curl.h> #include <cstring> #include <iostream> #define DEBUG 1 ///////////////////////////////////////////////////////////////////////////// size_t lyricsDownloader::write_data_to_var(char *ptr, size_t size, size_t nmemb, void *userdata) // this function is a static member function { ostringstream * stream = (ostringstream*) userdata; size_t count = size * nmemb; stream->write(ptr, count); return count; } string AZLyricsDownloader::toProviderCode() const { /*this creates an url*/ } CURLcode AZLyricsDownloader::download() { CURL * handle; CURLcode err; ostringstream buff; handle = curl_easy_init(); if (! handle) return static_cast<CURLcode>(-1); // set verbose if debug on curl_easy_setopt( handle, CURLOPT_VERBOSE, DEBUG ); curl_easy_setopt( handle, CURLOPT_URL, toProviderCode().c_str() ); // set the download url to the generated one curl_easy_setopt(handle, CURLOPT_WRITEDATA, &buff); curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, &AZLyricsDownloader::write_data_to_var); err = curl_easy_perform(handle); // The segfault should be somewhere here - after calling the function but before it ends cerr << "cleanup\n"; curl_easy_cleanup(handle); // copy the contents to text variable lyrics = buff.str(); return err; } main.cpp #include <QString> #include <QTextEdit> #include <iostream> #include "lyricsDownloader.h" int main(int argc, char *argv[]) { AZLyricsDownloader dl(argv[1], argv[2]); dl.perform(); QTextEdit qtexted(QString::fromStdString(dl.lyrics)); cout << qPrintable(qtexted.toPlainText()); return 0; } When running ./maelyrica Anthrax Madhouse I'm getting this logged from curl * About to connect() to azlyrics.com port 80 (#0) * Trying 174.142.163.250... * connected * Connected to azlyrics.com (174.142.163.250) port 80 (#0) > GET /lyrics/anthrax/madhouse.html HTTP/1.1 Host: azlyrics.com Accept: */* < HTTP/1.1 301 Moved Permanently < Server: nginx/1.0.12 < Date: Thu, 05 Jul 2012 16:59:21 GMT < Content-Type: text/html < Content-Length: 185 < Connection: keep-alive < Location: http://www.azlyrics.com/lyrics/anthrax/madhouse.html < Segmentation fault Strangely, the file is there. The same error is displayed when there's no such page (redirect to azlyrics.com mainpage) What am I doing wrong? Thanks in advance EDIT: I made the function for writing data static, but this changes nothing. Even wget seems to have problems $ wget http://www.azlyrics.com/lyrics/anthrax/madhouse.html --2012-07-06 10:36:05-- http://www.azlyrics.com/lyrics/anthrax/madhouse.html Resolving www.azlyrics.com... 174.142.163.250 Connecting to www.azlyrics.com|174.142.163.250|:80... connected. HTTP request sent, awaiting response... No data received. Retrying. Why does opening the page in a browser work and wget/curl not? EDIT2: After adding this: curl_easy_setopt(handle, CURLOPT_FOLLOWLOCATION, 1); The log is: * About to connect() to azlyrics.com port 80 (#0) * Trying 174.142.163.250... * connected * Connected to azlyrics.com (174.142.163.250) port 80 (#0) > GET /lyrics/anthrax/madhouse.html HTTP/1.1 Host: azlyrics.com Accept: */* < HTTP/1.1 301 Moved Permanently < Server: nginx/1.0.12 < Date: Fri, 06 Jul 2012 09:09:47 GMT < Content-Type: text/html < Content-Length: 185 < Connection: keep-alive < Location: http://www.azlyrics.com/lyrics/anthrax/madhouse.html < * Ignoring the response-body * Connection #0 to host azlyrics.com left intact * Issue another request to this URL: 'http://www.azlyrics.com/lyrics/anthrax/madhouse.html' * About to connect() to www.azlyrics.com port 80 (#1) * Trying 174.142.163.250... * connected * Connected to www.azlyrics.com (174.142.163.250) port 80 (#1) > GET /lyrics/anthrax/madhouse.html HTTP/1.1 Host: www.azlyrics.com Accept: */* < HTTP/1.1 200 OK < Server: nginx/1.0.12 < Date: Fri, 06 Jul 2012 09:09:47 GMT < Content-Type: text/html < Transfer-Encoding: chunked < Connection: keep-alive < Segmentation fault

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• How do I grep in a variable?

  - by Ashfame

  How to do a grep in a variable? I have stored the wget output in a variable and I need to extract out some strings from it. Like the content of the variable is upgrade http://wordpress.org/download/ http://wordpress.org/wordpress-3.0.5.zip 3.0.5 en_US 4.3 4.1.2 I need to check if the string contains the word upgrade, so I can do a simple grep and then check the exit status of it by $? and proceed. But how can I get the value 3.0.5 which is actually the fourth word? And how to actually grep in a variable?

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• Patches and translations

  - by Chris Wilson

  When changing a string of text as a part of a patch, how should the translation in the .po files be handled? For example, a recent paper cut I've worked on involved changing the string "Reboot Anyway" to "Restart Anyway" when gnome-session detected applications still running during restart. When I greped for the offending string, I found not only the string on the Gtk button, but identical strings in a long list of .po files which I later learned contained translations. The format of these translations of along the lines of msgid:Reboot Anyway <translated text> Changing the text of only the button would results in a discrepancy between the text on the English button and the translation, and changing the msgid line would result in a similar situation. How should I raise the issue that new translations are needed? I know this is a trivial problem in this example, but there are other such bugs that involve rewriting entire paragraphs of text.

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• Keeping iPhone application in sync with GWT application.

  - by Reflog

  Hi, I'm working on an iPhone application that should work in offline and online modes. In it's online mode it's supposed to feed all the information the user enters to a webservice backed by GWT/GAE. In it's offline mode it's supposed to store the information locally, and when connection is available sync it up to the web service. Currently my plan is as follows: Provide a connection between an app and a webservice using Protobuffers for efficient over-the-wire communication Work with local DB using Core Data Poll the network status, and when available sync the database and keep some sort of local-db-to-remote-db key synchronization. The question is - am I in the right direction? Are the standard patterns for implementing this? Maybe someone can point me to an open-source application that works in a similar fashion? I am really new to iPhone coding, and would be very glad to hear any suggestions. Thanks

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• Unable to connect to sql database only from asp

  - by Brian

  In a VB6 program: Dim conn As Object Set conn = CreateObject("ADODB.Connection") conn.Open "DRIVER={SQL Server}; Server=(local)\aaa; Database=bbb; UID=ccc; PWD=ddd" In an ASP program: Sub ProcessSqlServer(conn) Set conn = Server.CreateObject("ADODB.Connection") conn.Open "DRIVER={SQL Server}; Server=(local)\aaa; Database=bbb; UID=ccc; PWD=ddd" The VB6 program works, the ASP program does not (see error below). I tried checking the event log for errors, but found nothing. Or more precisely, I did find local an activation permission error, but this was fixed once I added local launch/activation permission for Network Service to the Machine Debug Manager via the component services tool. Error: Microsoft OLE DB Provider for ODBC Drivers error '80004005' [Microsoft][ODBC SQL Server Driver]Timeout expired

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