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• Decoding a GIF question

  - by teehoo

  For a personal project I'm creating a static gif decoder. Everything works well so far, except I'm having trouble understanding one concept from the specification: This block is REQUIRED for an image. Exactly one Image Descriptor must be present per image in the Data Stream. An unlimited number of images may be present per Data Stream. (Spec) Unlimited images per data stream? There can be more than 1? I'm assuming they don't mean an animated GIF because in the same specification they state, that they don't recommend gif's be used for animation. I've read a lot of other sites documenting the gif format and they all state something similar. Heres another link: There might be an unlimited number of images present in a GIF. Any ideas?

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• Java RS232 Comm on Vista-64 bit

  - by DD

  We have a Java application which needs to communicate with a peripheral device over Virtual Serial COM port. We use the RS232 Java COMM API (javax.comm.properties, comm.jar, win32com.dll) to achieve the same. Currently the code works fine on Windows XP 32-bit, Vista 32-bit and Windows 7. However we are having a problem trying to communicate on Vista 64-bit. I read from the Java forums that there is no 64-bit support for the Java COMM API I was wondering if anyone was facing a similar situation and were able to resolve the same in some way?

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• Absolutely positioned element inside fixed positioned element

  - by Salman A

  Related to my previous question, I have a <div style="position: fixed;"> footer. The footer contains <a style="display: block; float: left;"> elements. Upon clicking one of these links I want a div to popup above that link. I am experimenting with a couple of CSS settings and got acceptable results but I am not sure if my CSS will work across browsers. I am wondering if some one can tell me a bullet proof and tested CSS solution to achieve something like this:

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• why cacti is showing empty graph.??.even if rrd file created..

  - by Divya mohan Singh

  hii, i have develop my own snmp service..and i want to plot a graph of an OID provided. so, i have create graph in cacti. -) Its is showing device up. -) It is creating rrd file.(RRDTool says OK). -) showing the graph but its empty. but when i check it say rrdtool fetch AVERAGE it showing me all the values nan only..the monitored OID is having value 47 and i have set min=0 and max=100 i am using cacti appliance by rpath http://www.rpath.org/ui/#/appliances?id=http://www.rpath.org/api/products/cacti-appliance still i can show value on graph.. where is the problem??can anyone plz tell me??

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• How do I display a local html file in a UIWebView?

  - by Thomas

  I have a relatively simple question that I cannot seem to find the answer for. While doing the Google Maps Java API Tutorials, I ran into a problem. I can load an HTML file from the web, but when I try it locally, it just displays the contents of the file instead of running the script. Here's what works: NSString *url = @"http://code.google.com/apis/maps/documentation/v3/examples/geocoding-simple.html"; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]]; [webView loadRequest:request]; I want to store the HTML file locally and run it from the device itself, so I tried: [webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"geocoding-simple" ofType:@"html"]isDirectory:NO]]]; and it just displayed the contents of the file. What am I doing wrong here? Thomas

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• Dynamics of the using keyword

  - by AngryHacker

  Consider the following code: // module level declaration Socket _client; void ProcessSocket() { _client = GetSocketFromSomewhere(); using (_client) { DoStuff(); // receive and send data Close(); } } void Close() { _client.Close(); _client = null; } Given that that the code calls the Close() method, which closes the _client socket and sets it to null, while still inside the `using' block, what exactly happens behind the scenes? Does the socket really get closed? Are there side effects? P.S. This is using C# 3.0 on the .NET MicroFramework, but I suppose the c#, the language, should function identically. The reason i am asking is that occasionally, very rarely, I run out of sockets (which is a very precious resource on a .NET MF devices).

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• Using SketchFlow to prototype MS Surface Applications

  - by Isak Savo

  Hi We're doing mockups/prototyping on a MS Surface device and I wonder if anyone has succeeded in using SketchFlow for this. The problem that I see is that the code generated by the tool uses normal WPF controls (Button, etc.) instead of the contact aware surface counterparts (SurfaceButton) which means that they won't work nice on the surface unless you also use a mouse. Additionally, it would be nice if it was possible to hook in to other gesture events to trigger sketchflow transitions. Like the pinch gestures to switch page etc. Has anyone had any success with prototyping for Surface using Sketchflow. If so, how did you do it?

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• ServerAlias www.example.com is not recognized

  - by Tianzhou Chen

  Below is my config file: NameVirtualHost 12.34.56.78:80 < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain1.com ServerAlias www.domain1.com DocumentRoot /srv/www/domain1.com/public_html1/ ErrorLog /srv/www/domain1.com/logs/error.log CustomLog /srv/www/domain1.com/logs/access.log combined < /VirtualHost < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain2.com ServerAlias www.domain2.com DocumentRoot /srv/www/domain2.com/public_html1/ ErrorLog /srv/www/domain2.com/logs/error.log CustomLog /srv/www/domain2.com/logs/access.log combined < /VirtualHost The thing is when I put www.domain1.com into browser, apache2 doesn't retrieve the web page resides in /srv/www/domain1.com/public_html1/, instead, it gets the page from the default document root defined in another file. However, if I put www.domain2.com, everything works fine. I don't see any difference between two VirtualHost config block, so I wonder what does make the difference. BTW, I haven't put any .htaccess file under their document root. Thanks for your advice! Tianzhou

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• How to deal with OpenMP thread pool contention

  - by dpe82

  I'm working on an application that uses both coarse and fine grained multi-threading. That is, we manage scheduling of large work units on a pool of threads manually, and then within those work units certain functions utilize OpenMP for finer grain multithreading. We have realized gains by selectively using OpenMP in our costliest loops, but are concerned about creating contention for the OpenMP worker pool as we add OpenMP blocks to cheaper loops. Is there a way to signal to OpenMP that a block of code should use the pool if it is available, and if not it should process the loop serially?

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• Shark was unable to find symbol information for this address range - iPhone

  - by Elliot

  I'm trying to use Shark to determine which method(s) are taking the most time in my iPhone app. After sampling, I get this: Clicking the "!" button yields: Shark was unable to find symbol information for this address range. Typically this happens because the application was compiled without symbols or they have been subsequently stripped away. In Xcode, make sure the "Generate Debug Symbols" checkbox is selected (passes the -g flag to the compiler). Note that this does not affect code optimization, and does not typically alter performance significantly. However, the extra symbol information does consume significantly more space and may bloat the size of the executable. But I AM using the Debug option, and I am running on my Device. And Generate Debug Symbols IS checked. So what's wrong?

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• will paginate, nested routes, ruby, rails

  - by Sam

  I'm trying to get will paginate to link to my nested route instead of the regular posts variable. I know I'm supposed to pass some params to paginate but I don't know how to pass them. Basically there is an array stored in @posts and the other param paginate has access to is category_id. The nested route is /category/1/posts but hitting next and previous on will paginate returns a url like this posts?page=1&category_id=7. <%= will_paginate @most_recent_posts "What do I do here?" %> This is the result of Yannis's answer: In your controller you can do: @posts = @category.posts.paginate And in your view: <%= will_paginate(@post) %> Doing this comes up with the following URL posts?page=2&post_category_id=athlete_management routes.rb #there are more routes but these are the relevant ones map.resources :posts map.resources :post_categories, :has_many => :posts solution map.resources :post_categories do |post_category| post_category.resources :posts end map.resources :posts Had to declare the resource after the block Thanks stephen!

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• How to use CFUUID, can CFUUID be traced back to a unique individual. security/privacy

  - by Kevin

  Hi, i an new to iphone Dev and the concept of CFUUID, so thought i should ask, before i start implementing it. so the string returned by CFUUID is it really unique or can it be traced back to a unique individual. meaning lets say, i generate a CFUUID object and convert it to string(using the methods provided) , and then this info is used in my app or stored on a server database. and how unique is it, i mean is their a chance it can be similar to one generated on some other device. is it a good idea to use this info freely or are their some security/privacy aspects that i am not thinking about here. any help is greatly appreciated thanks

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• Regex & BBCode - Perfecting Nested Quote

  - by Moe

  Hey there, I'm working on some BBcode for my website. I've managed to get most of the codes working perfectly, however the [QUOTE] tag is giving me some grief. When I get something like this: [QUOTE=1] [QUOTE=2] This is a quote from someone else [/QUOTE] This is someone else quoting someone else [/QUOTE] It will return: > 1 said: [QUOTE=2]This is a quote from > someone else This is someone else quoting someone else[/QUOTE] So what is happening is the [/quote] from the nested quote is closing the quote block. The Regex I am using is: "[quote=(.*?)\](.*?)\[/quote\]'is" How can I make it so nested Quotes will appear properly? Thank you.

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• Need to upload binary to test in-app purchase?

  - by psychotik

  Opinion seems to be split on whether an app binary is required to be uploaded to iTunes Connect before a testing an in-app purchase. I've created the app (no binary uploaded yet), created the in-app purchase, enabled by App ID for in-app purchase and marked the purchase "available for sale". I've followed the instructions in the guide as far as I can tell. However, when I try it on my device I am unable to retrieve the products - SKProductRequest returns my request product as invalid. Any suggestions what I need to do? Does the in-app purchase product need to "Developer Approved" for this to work? Any definitive answer on whether a binary needs to be uploaded? I would like to avoid that if possible but am willing to do it if required.

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• load images dynamically on scroll in blackberry

  - by Maneesh

  How to display images in the form of pages where only one page is displayed at a time on blackberry screen. On scrolling down subsequent images will load at run time. So that loading of images do not consume time at startup. Edit: I am using loadimage function which loads images from blackberry device memory which loads images from specified path and resizing them.As number of images increases, it increases the startup time during opening of window.There is an in-built application(Media) in blackberry phone, where images load without taking any extra time. My idea is to display particular number of images which fit to the blackberry screen. As user scroll down to bottom of screen, application will then load and display more images. So my question is how to detect when user reached to bottom of blackberry screen and display one more row images.

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• Sending SMS with GSM phone\modem using Objective C

  - by user291182

  Hi Im new with Objective C but a veteran of C# & VB.Net. Is there an available API or functionality in cocoa where i can communicate with my GSM Phone to listen to any incoming SMS messages and be able to send messages myself. I'm trying to build an application for OSX SnowLeopard that can do this. Under the windows platform there are available API's that i can use to do this job for me. I just need hook up my mobile phone into my PC, configure the API to communicate with the phone thru one of the available COM Ports used by the device. Your help is very much appreciated. Thanks [email protected]

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• jQuery CSS Custom Flyout Menu Styling Issue

  - by aherrick

  I'm close to nailing this flyout menu I have been working on, just have a couple of current pain points. I'm trying to get left/right padding on my submenu items, as you can see I am not quite there. Also when the first submenu is displayed, I want to create a bit of a gap between the first row of list items and the child. Below is my current code and a screen shot displaying what I want. Based on my current CSS, any thoughts on how to get this done in a clean way? <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title></title> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript"> function mainmenu() { $("#nav ul").css({ display: "none" }); // Opera Fix $("#nav li").hover(function() { $(this).find('ul:first').css({ visibility: "visible", display: "none" }).show(400); }, function() { $(this).find('ul:first').css({ visibility: "hidden" }); }); } $(document).ready(function() { mainmenu(); }); </script> <style type="text/css"> * { padding: 0px; margin: 0px; } body { font-size: 0.85em; font-family: Verdana, Arial, Helvetica, sans-serif; } #nav, #nav ul { margin: 0; padding: 0; list-style-type: none; list-style-position: outside; position: relative; } #nav a { display: block; padding: 4px 0px 4px 0px; color: #dfca90; text-decoration: none; background-color: #ECE9D8; font-size: 9px; font-weight: bold; font: bold 15px Palatino, 'Palatino Linotype' , Georgia, serif; } #nav > li > a { font-size: 16px; font-variant: small-caps; border-right: 1px solid #dfca90; padding-right: 10px; padding-left: 10px; padding-bottom: 6px; padding-top: 6px; background-color: #fff; color: #dfca90; } #nav li ul li a:hover { color: #999; } #nav li { float: left; position: relative; } #nav ul { position: absolute; display: none; width: 170px; border: 2px solid #dfca90; } #nav ul li { } #nav li ul a { width: 170px; height: auto; float: left; } #nav ul ul { top: -2px; } #nav li ul ul { left: 170px; background-color: #ECE9D8; } #nav li:hover ul ul, #nav li:hover ul ul ul, #nav li:hover ul ul ul ul { display: none; } #nav li:hover ul, #nav li li:hover ul, #nav li li li:hover ul, #nav li li li li:hover ul { display: block; } </style> </head> <body> <ul id="nav"> <li><a href="#">1 HTML</a></li> <li><a href="#">2 CSS</a></li> <li><a href="#">3 Javascript </a> <ul> <li><a href="#">3.1 jQuery</a> <ul> <li><a href="#">3.1.1 Download</a> </li> <li><a href="#">3.1.2 Tutorial</a> </li> </ul> </li> <li><a href="#">3.2 Mootools</a></li> <li><a href="#">3.3 Prototype</a></li> </ul> </li> </ul> </body> </html>

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• How to secure connection between PHP and Android

  - by Elad Cohen

  I am developing an application for the Android that requires a connection with PHP pages in order to add sensitive data to a database that will affect the application. Since it's very easy to reverse engineer an android app, one can simply find the url where the data is sent to and manipulate it. I thought about creating a registration based on IMEI, but one can still able to manipulate it for his malicious purposes. I have also checked OAuth but I didn't really understand how it works and if it can help in my condition. What can I do to fully secure my application? Thanks in advance! EDIT: By the way, what I am mostly trying to achieve here is to make sure the requests are being sent from an Android and not from any other device.

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• BrowserField or CustomControls? What is the best to use when submitting and fetching data from web?

  - by SIA

  Hi Everybody, I am unable to decide whether what to use for my blackberry application. I am developing an application for Blackberry Device. This application send and recieves data from website. Thats the only functionality. I wanted to know what the best approach to go with. Shall i use BrowserField and display html in the application?? OR Shall i develop the custom controls and update the UI with the data fetched from the web?? Please Suggest, advice. thanks SIA

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• Monotouch Binding to Linea Pro SDK

  - by jeffrapp

  I'm trying to create a binding to the Linea Pro (it's the barcode scanner they use in the Apple Stores, Lowes) SDK. I'm using David Sandor's bindings as a reference, but the SDK has been updated a few times since January of 2011. I have most everything working, except for the playSound call, which is used to, well, play a sound on the Linea Pro device. The .h file from the SDK has the call as follows: -(BOOL)playSound:(int)volume beepData:(int *)data length:(int)length error:(NSError **)error; I've tried using int[], NSArray, and an IntPtr to the int[], but nothing seems to work. The last unsuccessful iteration of my binding looks like: [Export ("playSound:beepData:length:")] void PlaySound (int volume, NSArray data, int length); Now, this doesn't work at all. Also note that I have no idea what to do with the error:(NSError **)error part, either. I am lacking some serious familiarity with C, so any help would be extremely appreciated.

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• Does UIWebView support javascript-based double-click events?

  - by Eric

  As usual, I'm trying to do something the easiest way possible, in this case implement a double-tap handler on a UIWebView like so: <div id="foo" ondblclick="clickHandler(this);" ... > It works fine in Safari and Firefox, and I know the code containing clickHandler is loading on the iPhone thanks to a now-annoying alert stmt at the end of loading. If I change ondblclick to onclick it works on both the device and the simulator. From reading similar queries it would seem that I need to intercept the taps in ... and then run my JavaScript code with the stringByEvaluatingJavaScriptFromString method, but then how do I know the JS id of the target? I no like that, would rather write a pure HTML/DOM/JS solution. Or since my app is about 80% web content, should I be using phonegap instead?

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• Technology stack for very frequent gps data collection

  - by gvaswani

  I am working on a project that involves gps data collection from many users (say 1000) every second (while they move). I am planning on using a dedicated database instance on EC2 with the mysql persistent block storage and run a ruby on rails application with nginx frontend. I haven't worked on such data collection application before. Am I missing something here? I will have a another instance which will act as application server and use the data from the same EBS. If anybody has dealt with such a system before, Any advise would be much appreciated?

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• How to add a dynamic library to Android?

  - by Malcolm

  I want to add a non-native shared library to Android so every application on the device would be able to use it. I mean using packaged classes just like a core library as if they were present in the application itself. I studied Android source code to figure out a way to add a new path to the application ClassLoader and found out that it is created during startup and there's no way to change the paths later. I can use my own ClassLoader, but all I will get after loading a class will be a reference to a Class object. This way I will be bound to work through reflection mechanism, which is slower than the native execution system. Is there any way to organise a shared library on Android?

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• Wifi and 3G same time

  - by Skolleus

  For my App I need Data from both, a local Network and the Internet. The local Network (Wifi) has no connection to the internet so I have to use the mobile connection (3G for Example). But whenever I connect to the local Network, 3G stopps. After asking the Samsung Service, there is no way to change that in the UI. But they couldn't tell me, if there is a programmable Interface for that. There is a mobile access point inside, so there is a way to connect a Wifi device to the Internet (which means that both, a wifi and a 3G connection is possible the same time in that way). But for my App the phone/tab has to connect to the existing Network and use the 3G for Internet. So this is my question here. Is there a way to connect to an existing Network and using 3G for Internet the same time?

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• jQuery events .load(), .ready(), .unload()

  - by Eric

  Hi folks, Just a simple question, for the jquery event. Are the .load(), .ready() and .unload() run in order when the DOM is loaded? The answer seems yes when I see the jQuery Documentation. <script type="text/javascript"> $(window).load(function () { // run code initializeCode(); }); $(document).ready(function() { //run code that MUST be after initialize }); $(window).unload(function() { Cleanup(); }); </script> However, the code inside the .ready() is execute before the initializeCode(); is execute, so I feel really strange. And now I have to place my code inside the .onload() method and just after the initializeCode(); line, which means to be inside the .ready() block. Could someone explain me more about this, as I am new to jQuery. Thank you so much.

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