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• Question about tracking user in a map application using cellid

  - by subh

  I am trying to understand the concept of cellid (http://www.opencellid.org/api) As per that, if we send a request http://www.opencellid.org/cell/get?key=myapikey&mnc=1&mcc=2&lac=200&cellid=234 it will respond with the latitude and longitude. I was wondering if this can be used from within a google map application for tracking a user or it needs to be used from within a mobile device? If it can be used from within a web app, what parameters should it use for mcc: mobile country code (decimal) mnc: mobile network code (decimal) lac: locale area code (decimal) cellid: value of the cell id E.g., will it work if we know the cell number of the person(e.g., 281 222 6700)

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• What does "infinity" really mean on a connection timeout? Does it retry the connection?

  - by corgrath

  The difference between connection and read timeout, is that read specifies how long the data connection can be open until it automatically closesc, correct? A connection timeout specifies how long the socket should wait until a connection is established, correct? So if a connection timeout is set to "infinity" what does that really mean? Will it try to establish a connection and if no response is given (as on packets are lost? or port is down?) it will just idle? or will Could someone please explain the basics of network/socket timeouts? and in what situation can a client socket wait infinity?

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• How to do a true Java ping from Windows?

  - by stjowa

  I have a device on a network that I am attempting to ping through my Java program. Through my windows command prompt, I can ping the device address fine and do a tracert on the address fine. Online, I have seen that in order to do a ping through Java you have to do the following: InetAddress.getByName(address).isReachable(timeout); But, when I use this code on my device address, it always returns false in my program. I am using the correct IPv4 address with a good timeout value. Also, if I use a localhost address, it works fine. Why can I ping the device through cmd, but not through my program? I have heard in various places that this is not a true ping. Is there a better way to emulate a ping in Java? Thanks

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• C#: Farm out jobs to worker processes on a multi-processor machine

  - by Andrew White

  Hi there, I have a generic check that needs to be run on ca. 1000 objects. The check takes about 3 seconds. We have a server with 4 processors (and we also have other multi-processor servers in our network) so we would like to create an exe / dll to do the checking and return the results to the "master". Does anyone know of a framework for this, or how would one go about it in C#? Specifically: * What's the best way to transfer data between the master and the worker process? * How would the master ensure that always 4 processes are running at any one time and as soon as a worker process is finished start a new one. * How to register that the worker is finished and append it's results to a list? Hope it's clear enough but happy to clarify. A.

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• Node.js for lua?

  - by Shahbaz

  I've been playing around with node.js (nodejs) for the past few day and it is fantastic. As far as I can tell, lua doesn't have a similar integration of libev and libio which let's one avoid almost any blocking calls and interact with the network and the filesystem in an asynchronous manner. I'm slowly porting my java implementation to nodejs, but I'm shocked that luajit is much faster than v8 JavaScript AND uses far less memory! I imagine writing my server in such an environment (very fast and responsive, very low memory usage, very expressive) will improve my project immensly. Being new to lua, I'm just not sure if such a thing exists. I'll appreciate any pointers. Thanks

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• What messaging technologies in windows-ce for gauranteed msg delivery?

  - by Aidanapword

  All, We are building a windows-ce (6.0R3) based device that requires guaranteed and audit-ready message delivery (including store & forward) up to and down from the cloud. I have been looking for choices beyond: MSMQ a proprietary solution (what our prototype device is using) AMQP (research on using this in our context is now starting) ... are there any others? We will be transporting sensitive data (who isn't?!?!) over a public network, and large scale options are required. Anything running on an embedded device will be performance sensitive too. Thanks! Aidanapword

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• using ruby test and selenium grid how can I keep the same browser window for multiple tests?

  - by George Horlacher

  Each of my tests start a new selenium client browser and tear it down so they can run stand alone with this code: def setup if $selenium @selenium = $selenium else @selenium = Selenium::SeleniumDriver.new("#$sell_server", 4444, "#$browser", "http://#$network.#$host:2086", 10000); @selenium.start end @selenium.set_context("test_login") end def teardown @selenium.stop unless $selenium assert_equal [], @verification_errors end What I'd like is to run a suite of tests that all use the same browser and don't keep opening and closing new browsers for every test. I've tried using $selenium as a global object / browser but each test still opens up a new browser and closes it. How should this be done?

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• Commutative (operational transform) diffs for databases

  - by barrycarter

  What Unix program generates "diff"s between text files (or INSERT/UPDATE/DELETEs for databases) in such a way that the order that the "diff"s are applied in is irrelevant, and the result is the same regardless of order. Etherpad used to do something like this. Example (for a given document or database): % Adam makes a change X, then Bob makes a change Y, then Adam makes another change Z. % However, because of network latency, Adam sees the changes in this order: XZY, while Bob sees them in this order: YXZ. % However, the code/changes are written so that XYZ and YXZ yield the same result. Note: ideally, this can be done without having to do X/Y/Z inverse at any point. I have read http://stackoverflow.com/questions/2043165/operational-transformation-library but I'm not sure this really does what I want.

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• How can I package sqlite with my Perl for Windows application?

  - by Paul Nathan

  I need to set up sqllite for Perl on a Windows box. However - Perl is probably being run over the network from a central server, and I do not know what modules will be available on initial running of my script. I can guarantee Perl 5.8+ (activestate) or Perl 5.10+ (strawberry). Therefore, I need to package sqlite & the associated Perl module(s) in the project directory itself. Having Goggled around, I don't see any immediate zipfile to do this.

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• How to implement blocking request-reply using Java concurrency primitives?

  - by Uri

  My system consists of a "proxy" class that receives "request" packets, marshals them and sends them over the network to a server, which unmarshals them, processes, and returns some "response packet". My "submit" method on the proxy side should block until a reply is received to the request (packets have ids for identification and referencing purposes) or until a timeout is reached. If I was building this in early versions of Java, I would likely implement in my proxy a collection of "pending messages ids", where I would submit a message, and wait() on the corresponding id (with a timeout). When a reply was received, the handling thread would notify() on the corresponding id. Is there a better way to achieve this using an existing library class, perhaps in java.util.concurrency? If I went with the solution described above, what is the correct way to deal with the potential race condition where a reply arrives before wait() is invoked?

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• GameKit peer to peer wifi without wireless router?

  - by Tim

  Hi all! Thanks in advance for any thoughts about this. I'm looking for a way to do realtime inter-app communication in iOS via wi-fi (I need about 150 ft range and don't think bluetooth offers this) and wonder about the peer-to-peer connectivity offered by GameKit which, apparently offers both bluetooth and wi-fi connectivity. My question is: must participating devices be members of an available wireless network (via a wireless router) or is this connectivity truly peer-to-peer requiring no router? I understand Wi-fi Direct is coming and would likely be an option. Just wondering if I can do this utilizing services available in iOS today. Thanks! Tim

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• Asp.Net MVC best way to update cached table

  - by Eddy Mishiyev

  There are certain tables that get called often but updated rarely. One of these tables is Departments. So to save DB trips, I think it is ok to cache this table taking into consideration that the table has very small size. However, once you cached it an issue of keeping the table data fresh occurs. So what is the best way to determine that the table is dirty and therefore requires a reload and how that code should be invoked. I look for solution that will be scalable. So updating the cache right after inserting will not work. So if one machine inserted the record all other on network should get notified to reload the cache. I was thinking for calling corresponding web service from T-SQL but don't really like the idea of consuming recourses on sql server. So what are the best practices to resolve this type of problems. Thanks in advance Eddy

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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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• firefox open local link to directory with explorer

  - by raffael

  On a Website for our internal use i show links to local files and folders. the links are like this: href="file://C:/example/" href="file://C:/example/test.odt" The Problem is now that the link to the directory does open in firefox itself with a useless directory listing. Useless because you can just see the files or open them but not copy, insert, delete... The link to the file work normal and the file is opend by OpenOffice. By changing the configuration of firefox and setting the following key to false I can open the directory in with explorer.exe but for the file I have to choose the right application. network.protocol-handler.expose.file Does someone know a way to get both to work like i want? Means that the Directory is shown by explorer.exe and all files are opened by the right application. This can be by configuring Firefox or windows, changing the links, or even by writing a small program which opens all the file protocol correctly and will be used as protocol handler for the file protocol in firefox. Thanks Raffael

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• UnknownHostException for server java

  - by nilesh

  I am not able to connect to an remote known server through Java code; the exception while connecting is java.net.NoRouteToHostException: No route to host. But strangely, I am able to connect to same server through ssh. Details: Simple Java client when tries to establish connection with Java standalone server, while conneting the exception occurs at following statement: Socket socket = new Socket(ServerIP ServerPort); The port needed is open on server so that externally request can come in. Again the following is returns false InetAddress.getByName(SERVER_IP).isReachable(1000) The Server is running on Fedora, Java 5. FYI: Java cannot resolve DNS address from AIX: UnknownHostException is almost same to my question, but somehow this is not AIX related; moreover I feel the issue to be more of Network or firewall issue. Please guide me.

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• md5hash performance with big files for check copy files in shared folder

  - by alhambraeidos

  Hi all, My app Windows forms .NET in Win XP copy files pdfs in shared network folder in a server win 2003. Admin user in Win2003 detects some corrupt files pdfs, in that shared folder. I want check if a fileis copied right in shared folder Andre Krijen says me the best way is to create a MD5Hash of original file. When the file is copied, verify the MD5Hash file of the copied one with the original one. I have big pdf files. apply md5 hash about big file, any performance problem ?? If I only check (without generate md5 hash) Length of files (original and copied) ?? Thanks in advanced.

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• How to send/open email attachments from android app?

  - by CSharperWithJava

  I would like to somehow send a file from my app on one android device to my app on another device. This can be done any which way, and I'm open to suggestions if you can tell me how to send over network or something like that. Currently, I'm looking at sending the file as an email attachment, but I haven't found any good documentation on how to do it. I need two things to accomplish this, be able to send my file (stored on sd card or somewhere on device) as an attachment, and have my app recognized by android as the app to open an attachment with the file extention (.lst). Any thoughts? The files will all be fairly small xml text files if that makes a difference.

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• WSSQL query for multiple computers at once

  - by Josh

  I can run normal searches just fine. Windows 7 won't let me add a network share to my local index, but I can query the remote index just fine. The problem is that I can't find a way to query two indexes at once. I was hoping that something like this would work: SELECT System.ItemName FROM compA.SystemIndex, compB.SystemIndex WHERE SCOPE='file://compA/pathA' OR SCOPE='file://compB/pathB' but it doesn't. For simple queries, I can query compA and compB separately and then merge the results myself, but I'm hoping for a better way. Anybody here have some experience with this?

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• Phonegap/Cordova orientation change Android 4

  - by user1477576

  I have a problem changing the orientation of the device (Android 4). In other versions it works fine. Versión of Cordova: cordova-1.8.0.js / cordova-1.8.1.js In Android 4 the app crash or show: "A network error occurred. (file:///android_asset/www/index.html)" I searched a lot about this and no answer solves the problem. In most cases users suggest adding: android:configChanges="orientation|keyboardHidden|screenSize" In other cases: super.setIntegerProperty("loadUrlTimeoutValue",60000); That not work for me :( My manifest activity: <activity android:name=".AppNameActivity" android:label="@string/app_name" android:configChanges="orientation|keyboardHidden|screenSize"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> The application should run on Android 2.2 to 4. Thank you very much for the help.

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• PHP Download Script

  - by KA_lin

  [edited] I am trying to make a script that downloads a file, the problem is that i am accesing a page(from a server on the network) that generates that file (opens a download window). Is there a way I can get that file witought that pop-up in php? NOTE: I cannot modify the generating page... It is an excel file. The application is called Cognos. I managed with opera to see page variables parsed so I can get to the download page but I must make that download in a folder without the download pop-up

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• Display Computer Info on C# Web Application

  - by Gene

  I want to build a page for end users to visit (in our MPLS Network) and it show the following information in regards to them: Computer Name OS Disk Space Memory IP Address Active Directory User Name Password Expiration Time (As defined by Global Policy) Maybe a few other things such as Trend Micro Office current version vs. their version, # of MS Updates needed (we utilize WSUS), and a few other things in the future. My question is how would I pull this information from the user when they visit the page? What is the proper function for this? Anyone have examples they wish to share for me to learn by if possible? Thanks so much in advance, Gene

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• How to force Weblogic to start deployments in active state (i.e. not just prepared)

  - by doublep

  When I start a Weblogic instance with a deployed application, the deployment is sometimes left in prepared state, not in active state. I have to go to Weblogic Console and start the deployment manually, which is quite slow and annoying repetetive work. Since this is done on a development machine — sometimes 50 times a day, — there are no security implication as the server is only visible on the local network. Is there some way to have it always start the deployment active? Note that I'm not redeploying the application, I instead have it "constantly deployed" and stop/start the Weblogic instance using the scripts in bin directory.

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• Windows 7 running as server

  - by Artur

  I'm developing a program using Windows 7. There are WCF services (soap, rest) that are used by currently by Silverlight but very soon I'll start development of the mobile application that would make use of these services. On day to day basis I use Mac and Apache to host my website, but during the development of this program I would like to use IIS7 to put my services online. I have absolutely no problems to access all the services via localhost but as soon as I'm trying to connect through the internet I get "The connection has timed out". I'm sure that my router is configured right as it works perfectly fine when I'm on Mac OS, but it looks like Windows simply blocks incoming connections from outside; I cannot even connect from another computer on the same network. So is there a way of using Windows 7 as server with IIS7 or is it only possible with Windows Server? I know it might be like enabling/disabling one setting somewhere but I just cannot find it. Please help.

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• Numpy modify array in place?

  - by User

  I have the following code which is attempting to normalize the values of an m x n array (It will be used as input to a neural network, where m is the number of training examples and n is the number of features). However, when I inspect the array in the interpreter after the script runs, I see that the values are not normalized; that is, they still have the original values. I guess this is because the assignment to the array variable inside the function is only seen within the function. How can I do this normalization in place? Or do I have to return a new array from the normalize function? import numpy def normalize(array, imin = -1, imax = 1): """I = Imin + (Imax-Imin)*(D-Dmin)/(Dmax-Dmin)""" dmin = array.min() dmax = array.max() array = imin + (imax - imin)*(array - dmin)/(dmax - dmin) print array[0] def main(): array = numpy.loadtxt('test.csv', delimiter=',', skiprows=1) for column in array.T: normalize(column) return array if __name__ == "__main__": a = main()

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• Security & Authentication: SSL vs SASL

  - by 4herpsand7derpsago

  My understanding is that SSL combines an encryption algorithm (like AES, DES, etc.) with akey exchange method (like Diffier-Hellman) to provide secure encryption and identification services between two endpoints on an un-secure network (like the Internet). My understanding is that SASL is an MD5/Kerberos protocol that pretty much does the same thing. So my question: what are the pros/cons to choosing both and what scenarios make both more preferable? Basically, I'm looking for a guidelines to follow when choosing SSL or to go with SASL instead. Thanks in advance!

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