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  • Group Chat XMPP with Google App Engine

    - by David Shellabarger
    Google App Engine has a great XMPP service built in. One of the few limitations it has is that it doesn't support receiving messages from a group chat. That's the one thing I want to do with it. :( Can I run a 3rd party XMPP/Jabber server on App Engine that supports group chat? If so, which one?

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  • RC2 key schedule

    - by calccrypto
    Can someone explain how the RC2 key schedule works (particularly the very beginning of it)? i know it uses little endian, but my implementation is not working for any key except "0000 0000 0000 0000" Test Vector Key = 88bc a90e 9087 5a Plaintext = 0000 0000 0000 0000 Ciphertext = 6ccf 4308 974c 267f im assuming that the first thing to do with the key would be to change it into bc88 0ea9 8790 5a and yes i know RC2 is not even used anymore, but i would still like to know

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  • Java map / nio / NFS issue causing a VM fault: "a fault occurred in a recent unsafe memory access op

    - by Matthew Bloch
    I have written a parser class for a particular binary format (nfdump if anyone is interested) which uses java.nio's MappedByteBuffer to read through files of a few GB each. The binary format is just a series of headers and mostly fixed-size binary records, which are fed out to the called by calling nextRecord(), which pushes on the state machine, returning null when it's done. It performs well. It works on a development machine. On my production host, it can run for a few minutes or hours, but always seems to throw "java.lang.InternalError: a fault occurred in a recent unsafe memory access operation in compiled Java code", fingering one of the Map.getInt, getShort methods, i.e. a read operation in the map. The uncontroversial (?) code that sets up the map is this: /** Set up the map from the given filename and position */ protected void open() throws IOException { // Set up buffer, is this all the flexibility we'll need? channel = new FileInputStream(file).getChannel(); MappedByteBuffer map1 = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size()); map1.load(); // we want the whole thing, plus seems to reduce frequency of crashes? map = map1; // assumes the host writing the files is little-endian (x86), ought to be configurable map.order(java.nio.ByteOrder.LITTLE_ENDIAN); map.position(position); } and then I use the various map.get* methods to read shorts, ints, longs and other sequences of bytes, before hitting the end of the file and closing the map. I've never seen the exception thrown on my development host. But the significant point of difference between my production host and development is that on the former, I am reading sequences of these files over NFS (probably 6-8TB eventually, still growing). On my dev machine, I have a smaller selection of these files locally (60GB), but when it blows up on the production host it's usually well before it gets to 60GB of data. Both machines are running java 1.6.0_20-b02, though the production host is running Debian/lenny, the dev host is Ubuntu/karmic. I'm not convinced that will make any difference. Both machines have 16GB RAM, and are running with the same java heap settings. I take the view that if there is a bug in my code, there is enough of a bug in the JVM not to throw me a proper exception! But I think it is just a particular JVM implementation bug due to interactions between NFS and mmap, possibly a recurrence of 6244515 which is officially fixed. I already tried adding in a "load" call to force the MappedByteBuffer to load its contents into RAM - this seemed to delay the error in the one test run I've done, but not prevent it. Or it could be coincidence that was the longest it had gone before crashing! If you've read this far and have done this kind of thing with java.nio before, what would your instinct be? Right now mine is to rewrite it without nio :)

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  • Array from Requests

    - by Joseph Robidoux
    Hi ive set up 2 scripts, both communicating back and forth. One thing id like is for 1 script to post an unknown amount of GETs to the other script. Id like the other script to some how be able to grab all the GETS and put the values in an array.

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  • Zip codes in Radius Google Map

    - by Lee
    Hope someone can advise, I would like to be able to use google map API to find all Zip codes/cities with x Miles of a point. Has anyone done such a thing with google map or maybe some other type of service. Would love to know if so how you have achieved it ! Thank you if you can advise.

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  • How to specify a cipher for an SSL connection in .NET?

    - by dr. evil
    How can I specify a cipher suite to use in an SSL Connections? I know that Mentalis Seclib got this feature however they don't maintain the project as they say .NET Framework 2.0 introduced those features. However I couldn't find a way to do this in .NET Framework 3.5. To be more specific I want to connect an HTTPS service by using NULL cipher, I would do the same thing with OpenSSL by using the following command: openssl s_client -connect www.example.com:443 -cipher NULL How can I do this in .NET?

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  • iPhone app distribution build warning

    - by shreya
    Hi All, I build my app with distribution profile. Every thing goes fine except one warning, warning: 'The Validate Built Product build setting was not enabled when building for Distribution.' I find it on Google but get nothing. Is this warning affect my distribution build.? Can some one explains what that warning means.? I followed all steps mentioned at developer portal. Thanks In Advance.

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  • How to approach performance issues?

    - by jess
    Hi, We are developing a client-server desktop application(winforms with sql server 2008, using LINQ-SQL).We are now finding many issues related to performance.These relate to querying too much data with LINQ , bad database design,not much caching etc.What do you suggest,we should do - how to go about solving these performance issues? One thing,I am doing is doing sql profiling,and trying to fix some queries.As far caching is concerned,we have static lists.But,how to keep them updated,we don't have any server side implementation.So,these lists can be stale,if someone changes data. regards

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  • Hosting a VST/DX instrument in C#/C++?

    - by James D
    I'm trying to get a read on the effort level involved in building a barebones virtual instrument host in C++ or C# but I haven't been able to get any hard information. Does anybody know any good starter apps, tutorials, helper libraries for this sort of thing? If it matters, the goal would be to a) accept incoming MIDI events and b) dispatch them to the virtual instrument. In C++ or C#, if possible. Thanks!

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  • VBScript wont work on www.meteor.ie

    - by Davey Flavin
    The .Focus() function will not work in Windows Server 2003. Is there any thing i can do to make it work? WScript.Sleep 1000 .getElementByID("quickSearchMsisdn").value = "085729916" WScript.Sleep 1000 .getElementByID("quickSearchMsisdn").value = "0857299167" WScript.Sleep 1000 .getElementByID("quickSearchMsisdn").value = "0857299167" .getElementByID("quickSearchMsisdn").Focus WScript.Sleep 10000 .getElementByID("doSendSMS").click It is to log into my online mobile account and send me an automated text. What ever way the page is designed the number field needs to be clicked into.

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  • Shell script argument parsing

    - by Peter Coulton
    There are a number of questions about this sort of thing but lets imagine we are targeting a generic Linux system with both getopt and getopts installed (not that we'll use either, but they seem popular) How do I parse both long (--example | --example simple-option) and short argruments (-e | -esimple-example | -e simple-example)

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  • Scriptaculous Drag: How do I offset the dragging element?

    - by Angus Croll
    This is an age old problem - but now I'm using scriptaculous its come back to haunt me. When dragging a tree node over other tree nodes I want mouseover to fire for each node. So I want to position the dragging thing so that its top-left is slightly offset from the mousepointer I could reposition constantly in the onDrag handler but this is jerky and slow can anyone help? - thanks

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  • Choosing colour schemes

    - by DanDan
    How do you choose your colour schemes for your applications and/or web designs? Is it a gut instinct thing or can logic be applied here too? I have looked at some colour theory but my combinations seemed wrong. I am looking at a monochrome webpage. Rather than pluck colours out of the air as usual I would like to see if there is a science behind this. Links and opinions welcome.

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  • Java ArrayList initialization

    - by Jonathan
    I am aware that you can initialize an array during instantiation as follows: String[] names = new String[] {"Ryan", "Julie", "Bob"}; Is there a way to do the same thing with an ArrayList? Or must I add the contents individually with array.add()? Thanks, Jonathan

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  • Error 404 when trying to fetch the Google Buzz @consumption feed

    - by Vladimiroff
    I'm writing an Qt application and I go through authorization process and everything. I'm even able to fetch the @self feed, but for some reason I get error 404 when trying to do the same thing with @consumption: "Download of https://www.googleapis.com/buzz/v1/activities/v.kiril/@consumption failed: Error downloading https://www.googleapis.com/buzz/v1/activities/v.kiril/@consumption - server replied: Not Found" I've got this url from the Google Buzz API. And I've tried to use my personal google profile ID and this @me namespace. Without success

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  • substring using bat command

    - by user320550
    Hi all, I have the following thing in my bat file. say set path=c:\temp\test so basically i want to have an output which would give me the result as c:\temp\ i didnt find any indexof equivalent in bat command. Thanks.

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  • Reading HTTP server push streams with Python

    - by Sam
    I'm playing around trying to write a client for a site which provides data as an HTTP stream (aka HTTP server push). However, urllib2.urlopen() grabs the stream in its current state and then closes the connection. I tried skipping urllib2 and using httplib directly, but this seems to have the same behaviour. Is there a way to get the stream to stay open, so it can be checked each program loop for new contents, rather than waiting for the whole thing to be redownloaded every few seconds, introducing lag?

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  • jQuery $.each(arr, foo) versus $(arr).each(foo)

    - by Brian M. Hunt
    In jQuery, what's the difference between the following two constructions of jQuery.each: // Given var arr = [1,2,3,4], results = [], foo = function (index, element) { /* something done to/with each element */ results.push(element * element); // arbitrary thing. } // construction #1 $.each(arr, foo); // results = [1,4,9,16] // construction #2 $(arr).each(foo); // results = [1,4,9,16] Is there any difference, or is it purely syntax?

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  • How to implement email correlation with subject and body modification?

    - by Neuquino
    I have a system that sends mail. I have a system that receives mail. I need to identify that a received mail correlates with the one the other system sent. The particular thing here is that either the subject or the body can be modified. I thought on putting some hash in the header of the sent email, but I don't know where this could be added Don't you have any clue?

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  • Cleanest way to build an SQL string in Java

    - by Vidar
    I want to build an SQL string to do database manipulation (updates, deletes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way. I did think of using MessageFormat - but its supposed to be used for user messages, although I think it would do a reasonable job - but I guess there should be something more aligned to SQL type operations in the java sql libraries. Would Groovy be any good? Any help much appreciated.

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  • What is the "opposite" of request serialization called?

    - by Adam Lindberg
    For example, if a request is made to a resource and another identical request is made before the first has returned a result, the server returns the result of the first request for the second request as well. This to avoid unnecessary processing on the resource. This is not the same thing as caching/memoization since it only concerns identical requests ongoing in parallel. Is there a term for the reuse of results for currently ongoing requests to a resource for the purpose of minimizing processing?

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  • Bug in XCode debugger?

    - by John Smith
    I am working on an iPhone app which is using an external library for which I have the source. During debugging some of the objects are listed as 0x0 in the debugger but the app runs fine. Also, some of the objects addresses point to the wrong thing. These symbols are in the external library. The addresses are fine if I am tracing through a file actually in the external library. Does anyone have suggestions how to stop this behavior?

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  • How can I decode the boost library naming?

    - by Sorin Sbarnea
    I tried to find out that gd means in boost library name and I only found two other people looking for the same thing. I suppose it should be a place where this is clearly documented and I would like to find it. So far I found: mt - multitheaded, get it with threading=multi gd - ??? s - ??? sgd - ???

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