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• How do I get the size of a response from a Spring 2.5 HTTP remoting call?

  - by aarestad

  I've been poking around the org.springframework.remoting.httpinvoker package in Spring 2.5 trying to find a way to get visibility into the size of the response, but I keep going around in circles. Via another question I saw here, I think what I want to do is get a handle on the InputStream that represents the response from the server, and then wrap it with an Apache commons-io CountingInputStream. What's the best way to go about doing this? For the moment, I'd be happy with just printing the size of the response to stdout, but eventually I want to store it in a well-known location in my app for optional display.

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• Preventing Rails from opening production.log, when it is deployed with jruby-rack into tomcat.

  - by gregor

  I have to to deploy a Ruby on Rails application to an tomcat application server using jruby-rack. Due to security reasons my customer has the webapps directory mounted read only and he won't changed this. The problem that arises is, that the rails logger wants to open the WEB-INF/log/production.log in write mode. He writes nothing to this file because log4j and friends are configured and working, but rails complains that the file is not readable. Are there any suggestions from preventing rails from opening this file?

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• mod_wsgi | linux installation error

  - by MMRUser

  I'm getting the following error when I try to install mod_wsgi ./configure checking for apxs2... no checking for apxs... /usr/sbin/apxs checking Apache version... 2.2.3 configure: creating ./config.status config.status: creating Makefile make /usr/sbin/apxs -c -I/usr/local/include/python2.6 -DNDEBUG mod_wsgi.c -L/usr/local/lib -L/usr/local/lib/python2.6/config -lpython2.6 -lpthread -ldl -lutil -lm /apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -fno-strict-aliasing -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -pthread -I/usr/include/httpd -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/local/include/python2.6 -DNDEBUG -c -o mod_wsgi.lo mod_wsgi.c && touch mod_wsgi.slo sh: /apr-1/build/libtool: No such file or directory apxs:Error: Command failed with rc=8323072 . make: *** [mod_wsgi.la] Error 1 libtool is installed on my system.. mod_wsgi 3.2 *Apache 2.2* *Python 2.6*

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• qtableview (libqt) how do I correctly create a QModelIndex

  - by Chris Camacho

  I'm trying to enter edit mode on a specific cell like this void MainWindow::on_addButton_released(void) { tm->addRow(); tableView->scrollToBottom(); int ec=tm->firstWritableColumn(); int r=tm->rowCount(QModelIndex()); QModelIndex id = tm->index(r, ec, QModelIndex()); tableView->setCurrentIndex(id); tableView->edit(id); qDebug() << "row:" << r << " col:" << ec << "index:" << id; } my model creates an index like this QModelIndex TableModel::index(int row,int column,QModelIndex parent) const { Q_UNUSED(parent); return createIndex(row,column,0); } the debug output looks like this row: 9 col: 1 index: QModelIndex(9,1,0x0,TableModel(0xbf3f50) ) I'm fairly sure that the index is somehow invalid as setCurrentIndex doesn't seem to be working

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• Computationally simple Pseudo-Gaussian Distribution with varying mean and standard deviation?

  - by mstksg

  This picture from wikipedia has a nice example of the sort of functions I'd ideally like to generate http://en.wikipedia.org/wiki/File:Normal_Distribution_PDF.svg Right now I'm using the Irwin-Hall Distribution, which is more or less a Polynomial approximation of the Gaussian distribution...basically, you use uniform random number generator and iterate it x times, and take the average. The more iterations, the more like a Gaussian Distribution it is. It's pretty nice; however I'd like to be able to have one where I can vary the mean. For example, let's say I wanted a number between the range 0 and 10, but around 7. Like, the mean (if I repeated this function multiple times) would turn out to be 7, but the actual range is 0-10. Is there one I should look up, or should I work on doing some fancy maths with standard Gaussian Distributions?

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• Geolocation Null in lat and long

  - by user1706989

  I have had issue today in one application where Geolocation is not working. Even on this page http://slaveryfootprint.org/survey/#where_do_you_live . When you enter a location , its showing null lattiude and longitude. Even though it search for autolocation, it can point the right location. and it happened all if a sudden today which was working fine since yestrday night and when I see in console it is returning null lat and long and null for city and I did not change the code at all. Did google map api changed something. or do I need to update jquery? http://maps.google.com/maps/api/js?v=3.4&sensor=false

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• In C#, how do you send a refresh/repaint message to a WPF grid or canvas?

  - by xarzu

  How do you send a refresh message to a WPF grid or canvas? In other words, I have noticed while in debug mode, I can write code that sends a line to the display and then, if that line is not right, I can adjust it -- but the previous line is still there. Now, the code I am writing sends information to the display based on what the user clicks. So this must mean that the display is not refreshed each time a new set of lines and boxes and text goes to the grid or canvas in WPF. Using C# code, how do you send a refresh/repaint message to a WPF grid or canvas?

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• Alternative to Microsoft Agent / Fix for color issue?

  - by Rob P.

  I've got an app that does Text-To-Speech; but I wanted to show an animated face/character to go with it. I found a tutorial on Microsoft Agent and I implemented it in my vb.net app. The problem is with the transparency color. Unless I run application in compatibility mode/256 colors, the characters will appear with a purplish-pink background image instead of a transparent back-color. But running the app in 256 colors the rest of the app looks awfully out of place. First - is there something that works similar to MS Agent I can use that would be more appropriate? Second - if I'm still MS Agent - can I get the transparent color to work correctly without limiting myself to 256 colors?

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• webui for mercurial (hg)

  - by Extreme

  i'm looking for a good webui tool for mercurial. i've found this link Mercurial with WebUI but what i'm looking for is something that has the ability to do check-in and check-out per file like the PVCS. any suggestions? thanks Edit: Here's the link for PVCS. http://en.wikipedia.org/wiki/PVCS It's been around 4 years since I last used PVCS and a lot has probably changed but here's as far as I remember. It has a web application wherein a developer can check out a single file. If this file is checked-out, it will be locked to this developer and no other developer can check it out. Then can download the source but they won't be able to check it in unless the original developer (that checked-out the file) checks it in.

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• External log4j.xml file

  - by javamonkey79

  I am trying to run a jar with the log4j.xml file on the file system outside the jar like so: java -jar MyJarName.jar -cp=/opt/companyName/pathToJar/ log4j.configuration=log4j.xml argToJar1 argToJar2 I have also tried: java -jar MyJarName.jar -cp=/opt/companyName/pathToJar/ log4j.configuration=/opt/companyName/pathToJar/log4j.xml argToJar1 argToJar2 The log4j.xml is file is in the same directory as the jar (/opt/companyName/pathToJar/), yet I still get the standard warning message: log4j:WARN No appenders could be found for logger (org.apache.axis.i18n.ProjectResourceBundle). log4j:WARN Please initialize the log4j system properly. Is it possible to have the config file outside the jar, or do I have to package it with the jar? TIA

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• Vertex array with GLUTessellator

  - by user146780

  I notice that every tutorial on setting up the GLUTesselator and its callbacks, use GlBegin, GlEnd and a vertex callback which uses glVertex. It seems to me like this makes it run in immediate mode right? That seems to me as inefficient. How could I set it up to use a vertex array? Could I just use the output from the vertex callback and then generate a vertex array from this data then submit it like I might usually do it? Or is there another, better way of doing this? Thanks

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• File Encoding handling in Eclipse 3.5

  - by Cédric Girard

  Hi, I use Eclipse 3.5 on Windows, with PDT and Subclipse plugins, with both legacy projects using ISO-8859-1 encoding (latin-1), and newers ones wich use UTF-8. I configured my workspace to use UTF-8, and I configured old projects to use latin-1. But every time I open an old project, it use UTF-8. With a workspace using latin-1 by default, I have the same problem with utf-8 projects edited as iso-8859-1. My encoding choice is written in the file .settings/org.eclipse.core.resources.prefs but seems to be never read. The only solution for now is to have a latin1 workspace, and an utf8 one. Any better idea? Regards, Cédric

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• HttpTransportSE requestDump gives NullPointerException

  - by Chamila

  Hi, I'm trying to access a webservice in Android via Ksoap2 for android. The SoapObject is created ok, the S.o.p of the bodyOut outputs the desired strings. But when I do a requestDump of the HttpTransportSE object I create to make the call, a NullPointerException happens. In other words, the transport object is null. How can this happen? Web Service is at http://srilanka.lk:9080/services/CropServiceProxy?wsdl This service works very well with SoapUI. SoapUI Request <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:v1="http://schemas.icta.lk/xsd/crop/handler/v1/"> <soap:Header/> <soap:Body> <v1:getCropDataList> <v1:code>ABK</v1:code> </v1:getCropDataList> </soap:Body> </soap:Envelope> SoapUI Response <soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"> <soapenv:Body> <ns1:getCropDataListResponse xmlns:ns1="http://schemas.icta.lk/xsd/crop/handler/v1/"> <ns1:cropInfo> <ns1:name>Ambul Kesel</ns1:name> <ns1:price>35.0</ns1:price> <ns1:location>Dambulla</ns1:location> </ns1:cropInfo> <ns1:cropInfo> <ns1:name>Ambul Kesel</ns1:name> <ns1:price>40.0</ns1:price> <ns1:location>Dambulla</ns1:location> </ns1:cropInfo> </ns1:getCropDataListResponse> </soapenv:Body> </soapenv:Envelope> Client Side Complex Type KvmSerializable implementation public class CropInfo implements KvmSerializable { private String name; private float price; private String location; @Override public Object getProperty(int arg0) { switch (arg0){ case 0: return name; case 1: return price; case 2: return location; default: return null; } } @Override public int getPropertyCount() { return 3; } @Override public void getPropertyInfo(int arg0, Hashtable arg1, PropertyInfo arg2) { switch (arg0){ case 0: arg2.type = PropertyInfo.STRING_CLASS; arg2.name = "Name"; break; case 1: arg2.type = Float.class; arg2.name = "Price"; break; case 2: arg2.type = PropertyInfo.STRING_CLASS; arg2.name = "Location"; break; default: break; } } @Override public void setProperty(int arg0, Object arg1) { switch(arg0){ case 0: name = arg1.toString(); break; case 1: price = Float.parseFloat(arg1.toString()); case 2: location = arg1.toString(); default: break; } } } Web Service Call public void btnOnClick(View v){ String NAMESPACE = "http://schemas.icta.lk/xsd/crop/handler/v1/"; String URL = "http://220.247.225.202:9080/services/CropServiceProxy.CropServiceProxyHttpSoap12Endpoint"; String method_name = "getCropDataList"; String SOAP_ACTION = "http://schemas.icta.lk/xsd/crop/handler/v1/getCropDataList"; SoapObject soap_request = new SoapObject(NAMESPACE, method_name); soap_request.addProperty("code", "ABK" ); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12); envelope.setOutputSoapObject(soap_request); envelope.addMapping(NAMESPACE, "cropInfo", CropInfo.class); //envelope.dotNet=true; Marshal floatMarshal = new MarshalFloat(); floatMarshal.register(envelope); System.out.println("body out : " + envelope.bodyOut.toString()); //AndroidHttpTransport http_transport = new AndroidHttpTransport(URL); HttpTransportSE http_transport = new HttpTransportSE(URL); try { //NullPointerException HERE System.out.println(http_transport.requestDump); http_transport.call(SOAP_ACTION, envelope); //because we should expect a vector, two kinds of prices are given Vector<CropInfo> result_array = (Vector<CropInfo>)envelope.getResponse(); if(result_array != null){ for (CropInfo current_crop: result_array){ System.out.println(current_crop.getName()); System.out.println(Float.toString(current_crop.getPrice())); } } } catch (Exception e) { e.printStackTrace(); answer.setText("error caught"); //System.out.println(http_transport.responseDump); } // String result_string[] = (String[])result; //answer.setText("returned"); } Can anyone explain this?

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• Ruby on Rails: What are partial hash arguments and full set arguments?

  - by williamjones

  I'm using asserts_redirected_to in my unit tests, and I'm receiving this warning: DEPRECATION WARNING: Using assert_redirected_to with partial hash arguments is deprecated. Specify the full set arguments instead. What is a partial hash argument, and what is a full set argument? These aren't terms that I've seen used in the Rails community before, and the only relevant results I can find on Google for these are in reference to this deprecation warning. Here is my code: assert_redirected_to :controller => :user, :action => :search also tried: assert_redirected_to({:controller => :user, :action => :search}) I might have guessed that it feels I'm missing some parameters or something like that, but the API documentation explicitly says that not all parameters need to be included: http://rails.rubyonrails.org/classes/ActionController/Assertions/ResponseAssertions.html

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• iPhone status bar orientation with opengl

  - by sfider

  I have opengl only view that displays in portrait and landscape mode using projection matrix (view's transformation is identity all the time). I need to show status bar with proper orientation. I do this by setting status bar orientation property in UIApplication and changing frame of opengl view so the view won't go under status bar. When I change from landscape to portrait (landscape is the initial state) view's frame is set to (0, 20, 320, 460) and stays like this. However view appears to be translated by (-10, -10). It seems that I did change the size of view but couldn't move it. Weird things are: initialy view is full screen, I change it to (0, 0, 300, 480) (landscape with status bar) and it works then, it doesn't work when I try to chenge it for the second time (portrait with status bar) frame property of the view shows that view is placed correctly Any thoughts on what can by the problem?

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• TinyMCE: Double forecolor and backcolor buttons?

  - by petsson

  I'm having a problem using TinyMCE. In IE8, the forecolor and backcolor, for some random reason, is displayed twice. See picture below. Source code (I add the forecolor and backcolor in theme_advanced_buttons2): tinyMCE.init({ mode : "exact", elements : "<%= editArea.ClientID %>", custom_shortcuts : false, language : "en", relative_urls : false, convert_urls : false, forced_root_block : false, force_p_newlines : true, force_br_newlines : false, fix_nesting : true, plugins : "pagebreak,table", pagebreak_separator : '<div style="page-break-after:always;"></div>', theme : "advanced", skin : "o2k7", skin_variant : "blue", width : "540", height : "470", theme_advanced_toolbar_location : "top", theme_advanced_statusbar_location : "none", theme_advanced_font_sizes : "1,2,3,4,5,6,7", font_size_style_values : "0.6em,0.8em,1em,1.2em,1.5em,2em,3em", theme_advanced_buttons1 : "newdocument,|,copy,cut,paste,|,hr,pagebreak,|,undo,redo,|,code|,image,code", theme_advanced_buttons2 : "fontselect,fontsizeselect,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,forecolor,backcolor", // <-- This gives me double forecolor and backcolor theme_advanced_buttons3 : "table,|,row_props,cell_props,|,col_before,col_after,row_before,row_after,|,split_cells,merge_cells,|,delete_col,delete_row," });

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• Event Tracking

  - by DRapp

  I want to understand event cycles. I have a form with a grid and textboxes. It has a grid, bound to DataTable, and textboxes bound to same table too. I'm trying to debug something and need to know how to identify ALL events fired in the form to see what may solve an issue for me. Anyhow, unless I explicitly subclass every class on my form, and override / attach to every event to my own event handlers, how can I get / listen to all events being fired during a certain action... Such as changing a "Selected" road in a DataGridView. It obviously updates its own "CurrentRow"... I need to know what / how to maybe FORCE a re-loading of SAME CurrentRow. Reason: during a form level "Edit Mode", and I change the content in another "Textbox" control, and reject changes, I need it to simulate the current "Record" is reloaded to go back to its original values.

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• How can I allow users to switch data sources for an SSRS report?

  - by fatcat1111

  I have two SQL Server databases with identical schemas, but different data. I also have SSRS generating reports, in native mode, for one of the databases. All reports the same shared data source. I would like to allow users to get reports for the other database. I created a second shared data source for the second database. Modifying the reports to use this second data source results in reports as expected. Because the RDLs are the same, except for the data source, and because I don't want to maintain what are basically duplicate reports, I'm looking for a way to dynamically switch data sources, depending on user input. Is there an easy means of accomplishing this? An existing solution would be best. Barring that, can the RDL's data source be parametrized? Or, can the RDS's connection string be parametrized?

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• Neural Network Always Produces Same/Similar Outputs for Any Input

  - by l33tnerd

  I have a problem where I am trying to create a neural network for Tic-Tac-Toe. However, for some reason, training the neural network causes it to produce nearly the same output for any given input. I did take a look at Artificial neural networks benchmark, but my network implementation is built for neurons with the same activation function for each neuron, i.e. no constant neurons. To make sure the problem wasn't just due to my choice of training set (1218 board states and moves generated by a genetic algorithm), I tried to train the network to reproduce XOR. The logistic activation function was used. Instead of using the derivative, I multiplied the error by output*(1-output) as some sources suggested that this was equivalent to using the derivative. I can put the Haskell source on HPaste, but it's a little embarrassing to look at. The network has 3 layers: the first layer has 2 inputs and 4 outputs, the second has 4 inputs and 1 output, and the third has 1 output. Increasing to 4 neurons in the second layer didn't help, and neither did increasing to 8 outputs in the first layer. I then calculated errors, network output, bias updates, and the weight updates by hand based on http://hebb.mit.edu/courses/9.641/2002/lectures/lecture04.pdf to make sure there wasn't an error in those parts of the code (there wasn't, but I will probably do it again just to make sure). Because I am using batch training, I did not multiply by x in equation (4) there. I am adding the weight change, though http://www.faqs.org/faqs/ai-faq/neural-nets/part2/section-2.html suggests to subtract it instead. The problem persisted, even in this simplified network. For example, these are the results after 500 epochs of batch training and of incremental training. Input |Target|Output (Batch) |Output(Incremental) [1.0,1.0]|[0.0] |[0.5003781562785173]|[0.5009731800870864] [1.0,0.0]|[1.0] |[0.5003740346965251]|[0.5006347214672715] [0.0,1.0]|[1.0] |[0.5003734471544522]|[0.500589332376345] [0.0,0.0]|[0.0] |[0.5003674110937019]|[0.500095157458231] Subtracting instead of adding produces the same problem, except everything is 0.99 something instead of 0.50 something. 5000 epochs produces the same result, except the batch-trained network returns exactly 0.5 for each case. (Heck, even 10,000 epochs didn't work for batch training.) Is there anything in general that could produce this behavior? Also, I looked at the intermediate errors for incremental training, and the although the inputs of the hidden/input layers varied, the error for the output neuron was always +/-0.12. For batch training, the errors were increasing, but extremely slowly and the errors were all extremely small (x10^-7). Different initial random weights and biases made no difference, either. Note that this is a school project, so hints/guides would be more helpful. Although reinventing the wheel and making my own network (in a language I don't know well!) was a horrible idea, I felt it would be more appropriate for a school project (so I know what's going on...in theory, at least. There doesn't seem to be a computer science teacher at my school). EDIT: Two layers, an input layer of 2 inputs to 8 outputs, and an output layer of 8 inputs to 1 output, produces much the same results: 0.5+/-0.2 (or so) for each training case. I'm also playing around with pyBrain, seeing if any network structure there will work. Edit 2: I am using a learning rate of 0.1. Sorry for forgetting about that. Edit 3: Pybrain's "trainUntilConvergence" doesn't get me a fully trained network, either, but 20000 epochs does, with 16 neurons in the hidden layer. 10000 epochs and 4 neurons, not so much, but close. So, in Haskell, with the input layer having 2 inputs & 2 outputs, hidden layer with 2 inputs and 8 outputs, and output layer with 8 inputs and 1 output...I get the same problem with 10000 epochs. And with 20000 epochs. Edit 4: I ran the network by hand again based on the MIT PDF above, and the values match, so the code should be correct unless I am misunderstanding those equations. Some of my source code is at http://hpaste.org/42453/neural_network__not_working; I'm working on cleaning my code somewhat and putting it in a Github (rather than a private Bitbucket) repository. All of the relevant source code is now at https://github.com/l33tnerd/hsann.

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• Classes missing if application runs for a long time

  - by Rogach

  I have a funny problem - if my application runs for a long time ( 20h), then sometimes I get NoClassDefFound error - seems like JVM decided that the class is not going to be used anyway and GCd it. To be a bit more specific, here's an example case: object ErrorHandler extends PartialFunction[Throwable,Unit] { def isDefinedAt(t: Throwable) = true def apply(e: Throwable) =e match { // ... handle errors } } // somewhere else in the code... try { // ... long running code, can take more than 20 hours to complete } catch (ErrorHandler) And I get the following exception: Exception in thread "main" java.lang.NoClassDefFoundError: org/rogach/avalanche/ErrorHandler$ If that try/catch block runs for smaller amounts of time, everything works as expected. If anyone is interested, here is the codebase in question: Avalanche I need to note that I saw this and similar problems only on Cent OS 5 machines, using JRE 6u26 and Scala 2.9.1 / 2.9.2. What could be the cause of this problem?

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• how to profile multi threaded c++ app on linux?

  - by anon

  I used to do all my linux profiling with gprof. However, with my multi threaded app, it's output appears to be inconsistent. Now, I dug this up http://sam.zoy.org/writings/programming/gprof.html howver, it's from a long time ago -- and in my gprof output, it appears my gprof is listing functions used by non-main threads. So, my questions are: 1) in 2010, can I easily use gprof to profile multi threaded linux c++ apps? (ubuntu 9.10) 2) what other tools should I look into for profiling? thanks!

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• Go Channels in Ruby

  - by Julius Eckert

  In the Go programming language, you can send Messages around using a construct called "Channels". http://golang.org/doc/effective_go.html#channels I would love to use something like that in Ruby, especially for IPC. Pseudocode of what I want: channel = Channel.new fork do 3.times{ channel.send("foo ") } exit! end Thread.new do 3.times{ channel.send("bar ") } end loop do print channel.recv end # ~> bar foo foo bar bar foo Is there any construct, library or equivalent for Ruby which works like that ? If not: What is the best way to build such an abstraction?

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• Center the stage in Flash CS4/AS3 on a standalone player

  - by Technoh

  I have a Flash presentation (made in Flash CS4 with AS3) I am working on and running in a standalone Flash player. When I start the presentation the stage is centered in the Flash player, even if I resize it. The presentation contains an FLVPlayback component which, at different frames, plays different content. A navigation menu (made of buttons) is used to move through the different frames. My problem is that if the player is resized so that it is bigger than the stage, sometimes after going into and exiting from fullScreen mode, the stage is moved to the left and I cannot find a way to move it back to the center. I cannot stage the scale as the content becomes distorted and I do not want to force fullScreen all the time. I would just like to center the stage in the Flash player. Is such a thing possible? Any help is greatly appreciated.

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• Text Wrapping differences in IE7, IE8, and FF

  - by gmcalab

  When I have this <table> below, the text wraps as needed in FF and IE8, but when I run this in compatibility mode or IE7 the text does not wrap and the width of the previous is basically ignored. Any way to get around this? Here is a simplified example. <table> <tr> <td style="width:125px"> hi </td> <td>bye</td> </tr> <tr> <td> line of text that will equal more than the above width </td> <td>bye</td> </tr> </table>

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• Intra-Unicode "lean" Encoding Converters

  - by Mystagogue

  Windows provides encoding conversion functions ("MultiByteToWideChar" and "WideCharToMultiByte") which are capable of UTF-8 to/from UTF-16 conversions, among other things. But I've seen people offer home-grown 30 to 40 line functions that claim also to perform UTF-8 / UTF-16 encoding conversions. My question is, how reliable are such tiny converters? Can such a tiny amount of code handle problems such as converting a UTF-16 surrogate pair (such as ) into a UTF-8 single four byte sequence (rather than making the mistake of converting into a pair of three byte sequences)? Can they correctly spot "unpaired" surrogate input, and provide an error? In short, are such tiny converters mere toys, or can they be taken seriously? For that matter, why does unicode.org seemingly offer no advice on an algorithm for accomplishing such conversions?

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