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• Using SQLLite transactions I/O Error

  - by james.ingham

  I currently have a client / server setup where the client sends data to the server and then the server saves the data to a SQLite database file. To do this I am using transactions which works fine in windows 7 when I run around 30 clients (each client sending data back between 5 - 30 seconds). When using the same software in Windows XP, I can get/set data multiple times with no problems until I run around 20 clients I start to get Windows Delayed wrote failed errors: This fires an exception on the server: I'm assuming this is either something to do with XP or a hardware issue on the machine i'm running XP. Does anyone have any advice to avoid this? Or if I should just catch the exception and retry saving the data? Thanks

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• [C#] Onpaint events (invalidated) changing execution order after a period normal operation (runtime)

  - by Luke Mcneice

  Hi all, I have 3 data graphs that are painted via the their paint events. When I have data that I need to insert into the graph I call the controls invalidate() command. The first control's paint event actually creates a bitmap buffer for the other 2 graphs to avoid repeating a long loop. So the invalidate commands are in a specific order (1,2,3). This works well, however when the graphed data reaches the end of the graph window (PictureBox) where the data would normally start scrolling, the paint events begin firing in the wrong order (2,3,1). has anyone came across this before? why might this be happening?

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• How can I get elements out of an array with Template Toolkit?

  - by Przemek

  I have an array of Paths which i want to read out with Template Toolkit. How can I access the array Elements of this array? The Situation is this: my @dirs; opendir(DIR,'./directory/') || die $!; @dirs = readdir(DIR); close DIR; $vars->{'Tree'} = @dirs; Then I call the Template Page like this: $template->process('create.tmpl', $vars) || die "Template process failed: ", $template->error(), "\n"; In this template I want to make an Tree of the directories in the array. How can I access them? My idea was to start with a foreach in the template like this [% FOREACH dir IN Tree.dirs %] $dir [% END %]

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• Java Swing - Drawing markers on JSlider.

  - by Tony Day

  Hi, I have a progress bar which inherits from JSlider to provide highlighting functionality. Highlights can be added to the slider at a point (and a Color) and these are then painted onto the control. As follows: The problem is that I cannot get the highlights in the right place, they need to be in the same location as the markers. I also do not know how to retrieve the left and right margins to where the markers start and end. Is there anyway to get the coordinates of each marker? Or perhaps a better way of performing this task? Many Thanks!

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• [java] Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• How to add text to path?

  - by Pritorian

  Hi all. Te question is how to add text to path element. For example, I have path: Path firstPath = new Path(); firstPath.Stroke = Brushes.Black; firstPath.StrokeThickness = 1; myCanvas.Children.Add(firstPath); LineGeometry firstLine = new LineGeometry(); firstPath.Data = firstLine; And somewhere I define line's Start and End point's. The path is binded to controls (for example - two ellipses) and when I drag one of them, the line is dynamically resized and moved to be pinned to both objects. And now I wand to add some text, that would fit to this line and follow it. Any recommendations how to do this?

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• Need a way for users to enter data while offline and re-submit it when back online

  - by crankharder

  As part of a larger webapp, I want to build functionality that allows a user to enter data while offline -- and then send that data back to my site when they have a connection again The parts that, to me, are missing ar Saving a certain set of data in their browser Saving a form that allows them to enter data using form from step#2 to update data from step#1 getting data out of the local data store and sending it back to the server I would like to keep this entirely within the browser, so... Does HTML5 meet some (or all) of those goals as it's currently implemented in webkit/ff3? If not,what technologies should I start looking into in order to accomplish all of the above.

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• OpenAL doesn't work when using AVAudioRecorder and AVAudioPlayer

  - by Pawe

  hi. i have been troubled about audio problem for several days. i don't think OpenAL get along with AVAudio functions. i have my own OpenAL class. ( wrapped the MyOpenAL class ) my app start to record using AVAudioRecorder. i stop recording. and then i clicked the "OpenAL Play"button that play any sound using OpenAL. i can't hear it. but i can hear my recording when i clicked the "AVAudioPlayer Play" button using AVAudioPlayer. i tested oalTouch,avTouch,SpeakHear sample code. they resulted same. Does OpenAL have the problem using AVAudio~ Functions together? I was googling for a long time. but i couln't find out the solutions and the same problems issue. thanks for reading mine.

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• jQuery append value to html input depending on other input

  - by werm

  Ok, the title is a bit confusing, but here's my predicament. I've made a web app to track UPS packages internally at work. Currently, you input the tracking number and then select the city it was shipped from. All tracking numbers from an account start with the same X amount of numbers. So if someone entered "1Z8473..." into one input, "Houston, TX" would automatically be entered into the next input. Is this a difficult thing to pull off? Where would I begin?

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• Mixing a4 and a3 in one Latex file

  - by jorgusch

  Hello, I am finishing my thesis and have a large appendix. Some tables only look good, if first done on a3 and then (paper)printed on a4. Anyhow, working all the files seperalty is fine, but I struggle to compile all in one. I use the geometry package and start the document with: \usepackage[a4paper,left=30mm,right=20mm,top=20mm, bottom=20mm]{geometry} For the appendix, I want to include the table and use \newgeometry{a3paper,left=25mm,right=15mm, top=15mm, bottom=15mm} However, the command is completely ignored and I can read "a3paper,left=25mm,right=15mm, top=15mm, bottom=15mm" above the table. What did I miss? Is it even possible? If not, how do I get the numbers right, if I have to include it as a pdf (which works)? Thanks!

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• How to organize a ASP.NET MVC solution (DDD)

  - by vandalo

  Hello everyone. I am trying to start a new project (asp.net MVC) and I would like to apply some DDD rules I've learned in these last few months. I don't know how to organize my solution though. I would like to use Nhibernate but I don't want to use Fluent Nhibernate cause it must be something like an experiment. I've seen some examples where people keep everything in the same project. Some others tend to create a different project for everything. Do you think I should differentiate the model and the repository or put it in the same project? If someone has some links to articles etc it would be appreciated. thanks Alberto

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• Managing Unique IDs in stateless (web) DB4O applications

  - by Phil.Wheeler

  I'm playing around with building a new web application using DB4O - piles of fun and some really interesting stuff learned. The one thing I'm struggling with is DB4O's current lack of support for stateless applications (i.e. web apps, mostly) and the need for automatically-generated IDs. There are a number of creative and interesting approaches that I've been able to find that hook into DB4O's events, use GUIDs rather than numeric IDs or for whatever reason avoid using any system of ID at all. While each approach has its merits, I'm wondering if the less-elegant approach might equally be the best fit. Consider the following pseudo-code: If ID == 0 or null Set ID = (typeof(myObject)).Count myObject.Save It seems like such a blindingly simple approach, it's usually about here that I start thinking, "I've missed something really obvious". Have I?

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• How to decompress/inflate an XML response from ASP

  - by krisg

  Can anyone provide some insight into how i'd go about decompressing an XML response in classic ASP. We've been handed some code and asked to get it working: Set oXMLHttp = Server.CreateObject("MSXML2.ServerXMLHTTP") URL = HttpServer + re_domain + ".do;jsessionid=" + ue_session + "?" + data oXMLHttp.setTimeouts 5000, 60000, 1200000, 1200000 oXMLHttp.open "GET", URL, false oXMLHttp.setRequestHeader "Accept-Encoding", "gzip" oXMLHttp.send() if oXMLHttp.status = 200 Then if oXMLHttp.responseText = "" then htmlrequest_get = "Empty Response from Server" else htmlrequest_get = oXMLHttp.responseText end if else ... Apparently now that the response is compressed using gzip, we have to un-compress the XML response before we can start to work with the data. How should i go about this?

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• SWFUpload is it possible to upload multiple files to a single php script execution

  - by user176333

  Hello, I'm trying to implement SWFUpload into an existing PHP upload funcitonality. My current backend script however expects 2 fiels to be uploaded in a single php script execution. (e.g. it excepts the $_FILES parameters to contain 2 entries). So i'm queueing 2 files with SWFUpload and start uploading them. However it appears SWFLUpload calls the php backend script for each queued file. I'd rather modify SWFUpload to send the files with a single backend script execution instead on having to adjust the backend script. Is anyone familiar with this? I've searched various resources (like the SWFUploads docs and forum, but have not found similiar topics. Thanks in advance

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• Launch IE with specific BHO enabled

  - by watsonmw

  I have a IE BHO plugin that I only want to be enabled when the user launches IE from my program (The program start IE using CreateProcess()). I don't want this BHO to be enabled when a user launches IE from outside my program, as that would mean any problems in the BHO could potentially mess up the user's normal browsing experience. What's the best way to do this? One way would be to register the BHO, launch IE and then quickly unregister the BHO. This seems kind of messy though, as a crash in the program that launches IE could cause the BHO to remain registered.

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• Installing ant; clearly misunderstanding JAVA_HOME

  - by StormShadow

  Hey all, I am installing ant on a Windows XP machine, and am following the instructions at Apache's manual site. It said to set JAVA_HOME, so I checked, saw there was no environment variable named JAVA_HOME, made one, and set it to "C:\Program Files\Java\jdk1.6.0_19" When I try to run ant debug, however, it tells me that JAVA_HOME is currently set to "C:\Program Files\Java\jre6" I'm guessing JAVA_HOME isn't an environment variable. But if it isn't one, I'm at a loss as to where to start looking for it. Anybody know? Edit: Oh yeah - it's bugging me for tools.jar as well, but I'm guessing that when I fix the JAVA_HOME issue, that will help the terminal find tools.jar as well. Or maybe I'm wrong. Thanks

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• Occasional InterruptedException when quitting a Swing application

  - by Joonas Pulakka

  I recently updated my computer to a more powerful one, with a quad-core hyperthreading processor (i7), thus plenty of real concurrency available. Now I'm occasionally getting the following error when quitting (System.exit(0)) an application (with a Swing GUI) that I'm developing: Exception while removing reference: java.lang.InterruptedException java.lang.InterruptedException at java.lang.Object.wait(Native Method) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134) at sun.java2d.Disposer.run(Disposer.java:125) at java.lang.Thread.run(Thread.java:619) Well, given that it started to happen with a more concurrency-capable hardware, and it has to do with threads, and it happens occasionally, it's obviously some kind of timing thing. But the problem is that the stack trace is so short. All I have is the listing above. It doesn't include my own code at all, so it's somewhat hard to guess where the bug is. Has anyone experienced something like this before? Any ideas how to start solving it?

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• Careers in Computer Security? [closed]

  - by Joey Green

  I have the opportunity to go back for MSCS and the closest college's main research is in computer security and forensics. I've always been interested in computer networks and security but I have no interest whatsoever to run cables or add users to the network( which is what the network people do where I currently work ). I wanted to know how may I find out the types of day to day task a computer security expert does? I don't mean the jobs you find on dice or indeed. I'm talking about the type of careers that start out at the NSA or DIA. Also, I'm wondering what the pay is like for these types of fields? Thanks to all that reply.

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• BlackBerry - video player - FramePositioningControl is null

  - by sinu-mathews

  I'm developing a blackberry application that plays video from the server. I've used Player.start() and Player.stop() for playing and pausing a video. But I also need rewind, forward and seek bar controls in my application. I tried using FramePositioningControl for these controls. But the following code is returning null. FramePositioningControl framePositioningControl = (FramePositioningControl) player.getControl("FramePositioningControl"); I searched several forums and they say many players do not support FramePositioningControl. What players support FramePositioningControl? And what else should I do to add these controls in my application?

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• remuxing mpv files from h264 AVI files

  - by crankharder

  I have a bunch of, I think, x264 encoded AVIs that I'd like to convert to m4v so that I can play with Quicktime. Here's how I created them First I dump the vob from DVD with this: $ mplayer -dumpstream -dumpfile new.vob dvd://1 Then I compress it: $ mencoder -oac copy -o new.avi -ovc x264 -x264encopts crf=18 new.vob I tried doing this to convertthem to m4v, but it's blowing up... I tried dumping the h264/acc streams: $ mplayer new.avi -dumpvideo -dumpfile new.h264 $ mplayer new.avi -dumpaudio -dumpfile new.acc And remuxing(?) with MP4Box but I'm getting an error: $ MP4Box -add new.h264#video -add new.aac#audio new.m4v Cannot find H264 start code Error importing new.h264#video: BitStream Not Compliant So not sure what to do now...

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• why egrep's stdout did not go through pipe?

  - by ccfenix

  Hi, i got a weird problem regarding egrep and pipe I tried to filter a stream containing some lines who start with a topic name, such as "TICK:this is a tick message\n" When I try to use egrep to filter it : ./stream_generator | egrep 'TICK' | ./topic_processor It seems that the topic_processor never receives any messages However, when i use the following python script: ./stream_generator | python filter.py --topics TICK | ./topic_processor everything looks to be fine. I guess there need to be a 'flush' mechanism for egrep as well, is this correct? Can anyone here give me a clue? Thanks a million import sys from optparse import OptionParser if __name__ == '__main__': parser = OptionParser() parser.add_option("-m", "--topics", action="store", type="string", dest="topics") (opts, args) = parser.parse_args() topics = opts.topics.split(':') while True: s = sys.stdin.readline() for each in topics: if s[0:4] == each: sys.stdout.write(s) sys.stdout.flush()

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• C# equlivent of performSelectorOnMainThread

  - by jamone

  I haven't done much multithreading before and now find the need to do some background work and keep the UI responsive. I have the following code. data.ImportProgressChanged += new DataAccess.ImportDelegate(data_ImportProgressChanged); Thread importThread = new Thread( new ThreadStart(data.ImportPeopleFromFAD)); importThread.IsBackground = true; importThread.Start(); void data_ImportProgressChanged(int progress) { toolStripProgressBar.Value = progress; } //In my data object I have public void ImportPeopleFromFAD() { ImportProgressChanged(someInt); } But the UI doesn't get updated since the ImportProgressChanged() call is made on the background thread. In objective C I know you can use performSelectorOnMainThread and pass it a method to call using the main thread. What is the equivalent way of calling ImportProgressChanged() from the main thread?

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• Throwing exception vs returning null value with switch statement

  - by Greg

  So I have function that formats a date to coerce to given enum DateType{CURRENT, START, END} what would be the best way to handling return value with cases that use switch statement public static String format(Date date, DateType datetype) { ..validation checks switch(datetype){ case CURRENT:{ return getFormattedDate(date, "yyyy-MM-dd hh:mm:ss"); } ... default:throw new ("Something strange happend"); } } OR throw excpetion at the end public static String format(Date date, DateType datetype) { ..validation checks switch(datetype){ case CURRENT:{ return getFormattedDate(date, "yyyy-MM-dd hh:mm:ss"); } ... } //It will never reach here, just to make compiler happy throw new IllegalArgumentException("Something strange happend"); } OR return null public static String format(Date date, DateType datetype) { ..validation checks switch(datetype){ case CURRENT:{ return getFormattedDate(date, "yyyy-MM-dd hh:mm:ss"); } ... } return null; } What would be the best practice here ? Also all the enum values will be handled in the case statement

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• UITextField with the lookup

  - by leon

  Hello, I would like to achive the same functinoanlity in the UUTextField control as Google search web site (which uses Ajax for this): as user start typing, list of suggestion searches is shown. Then more letteres you type, suggestion list changes. So imaging I have array of words: Apple Abc Aman As user types A, all thress suggesions are shown, if user type one more letter p, then Apple is suggested. How would I do something like this? Mail type of applicatins do it, when receipent name is typed in the To: edit control I guess I can use UITableView with the search, is it correct approach?

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• Perl SDL Windows Installation

  - by Blaise Roth

  I'm using Windows and I need the SDL Library to start using SDL with Perl. I've been pointed to http://www.libsdl.org/ to download it. My first queston is, which library do I want from that page? There's 3 to choose from... Then I've been pointed to 4 other SDL extensions by this page: http://arstechnica.com/gaming/news/2006/02/games-perl.ars. From those I've found there's a normal Win32 version and also a devel one. Which do I want? Thanks.

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