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• Why are primes important in cryptography?

  - by Michael Stum

  One thing that always strikes me as a non-cryptographer: Why is it so important to use Prime numbers? What makes them so special in cryptography? Does anyone have a simple short explanation? (I am aware that there are many primers and that Applied Cryptography is the Bible, but as said: I am not looking to implement my own cryptographic algorithm, and the stuff that I found just made my brain explode - no 10 pages of math formulas please :)) Thanks for all the answers. I've accepted the one that made the actual concept most clear to me.

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• IRb: how to start an interactive ruby session with pre-loaded classes

  - by Shyam

  Hi, As I am going through my journey by adopting the Ruby language, I spend a lot of time inside IRb. It's just fantastic! But, as I am not very aware of it's capabilities, and still a nuby with Ruby, I would like to know the following: How can I 'flush' the session, without restarting IRb (or is this not possible). How can I configure IRb to load a bunch of source files "hello.rb" and "hello_objects.rb", i.e. at startup? I am heavily working in these and it would be nice to know a short hand to load these classes, without manually typing 'load' for each again. Thank you for your answers, comments and feedback!

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• The second argument to copy() function cannot be a directory

  - by Jorm

  Anyone know why this: $title = trim($_POST['title']); $description = trim($_POST['description']); // Array of allowed image file formats $allowedExtensions = array('jpeg', 'jpg', 'jfif', 'png', 'gif', 'bmp'); foreach ($_FILES as $file) { if ($file['tmp_name'] > '') { if (!in_array(end(explode(".", strtolower($file['name']))), $allowedExtensions)) { echo '<div class="error">Invalid file type.</div>'; } } } if (strlen($title) < 3) echo '<div class="error">Too short title</div>'; else if (strlen($description) > 70) echo '<div class="error">Too long desccription.</div>'; else { move_uploaded_file($_FILES['userfile']['tmp_name'], 'c:\wamp\www\uploads\images/'); } Gives: Warning: move_uploaded_file() [function.move-uploaded-file]: The second argument to copy() function cannot be a directory in C:\wamp\www\upload.php on line 41 Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move 'C:\wamp\tmp\php1AB.tmp' to 'c:\wamp\www\uploads\images/' in C:\wamp\www\upload.php on line 41

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• Live video streaming using progressive download (and not RTMP) in Flash

  - by bartekb

  Hi, Is it possible to use progressive download for near real-time playback of a live video stream recorded with a webcam? What I need is that a video stream is recorded on one end, uploaded in real-time to a server and downloaded with a short delay, but in real-time, using progressive download (i.e., HTTP streaming) on another end for playback. Is it possible or does it require the use of RTMP? If it's possible, then does it require that Flash Media Server runs on a server? Thanks!

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• Is it possible to add -pedantic to GCC command line, yet have it not warn about 'long long'

  - by doublep

  I'm using mostly GCC to develop my library, but I'd like to ensure cross-compiler compatibility and especially standard conformance as much as possible. For this, I have add several -W... flags to command line. I'd also add -pedantic, but I have a problem with its warning about long long type. The latter is important for my library and is properly guarded with #if code, i.e. is not compiled on compilers that don't know it anyway. In short: can I have GCC in -pedantic mode warn about any extension except long long?

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• Dealing with HTTP Status Codes in PHPUnit_Extensions_Selenium2TestCase

  - by frosty

  I have a series of tests that I'm running for an Open Source Project, I'd like to get the status code of the curl request that is made to determine the difference of a code change breaking functionality vs a code change breaking the site completely. class ExampleTest extends PHPUnit_Extensions_Selenium2TestCase { public function setUp() { $this->setBrowser('firefox'); $this->setBrowserUrl('http://localhost'); } public function testForError() { $this->url('/'); $this->assertNotEmpty($this->title()); } } That's an example of how I'm going about it now, but I'd like to have some concrete information. Short of getting the information from the CURL request, I'm not really sure how to go about this...

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• Custom view in ListView disappears while scrolling in Android

  - by troorl

  Hi. I wrote a simple custom view for rows in ListView. It works fine, but when I try to scroll the list, I see only white rows without content. And when scrolling is over, rows continue to show again. This is how I draw a custom view: @Override protected void onDraw(Canvas canvas) { if(poster != null) { canvas.drawBitmap(poster, padding, padding, paint); } canvas.drawText(title, 55 + padding, 16 + padding, paint); } Maybe I missed something? P.S. This is short screencast (400kb) http://dl.dropbox.com/u/190203/test.mpeg

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• Can I have a shell alias evaluate a history substitution command?

  - by Brandon

  I'm trying to write an alias for cd !!:1, which takes the 2nd word of the previous command, and changes to the directory of that name. For instance, if I type rails new_project cd !!:1 the second line will cd into the "new_project" directory. Since !!:1 is awkward to type (even though it's short, it requires three SHIFTed keys, on opposite sides of of the keyboard, and then an unSHIFTed version of the key that was typed twice SHIFTed), I want to just type something like cd- but since the !!:1 is evaluated on the command line, I (OBVIOUSLY) can't just do alias cd-=!!:1 or I'd be saving an alias that contained "new_project" hard-coded into it. So I tried alias cd-='!!:1' The problem with this is that the !!:1 is NEVER evaluated, and I get a message that no directory named !!:1 exists. How can I make an alias where the history substitution is evaluated AT THE TIME I ISSUE THE ALIAS COMMAND, not when I define the alias, and not never? (I've tried this in both bash and zsh, and get the same results in both.)

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• How big can a user agent string get?

  - by Josh

  If you were going to store a user agent in a database, how large would you accomdate for? I found this technet article which recommends keeping UA under 200. It doesn't look like this is defined in the HTTP specification at least not that I found. My UA is already 149 characters, and it seems like each version of .net will be adding to it. I know I can parse the string out and break it down but I'd rather not. EDIT Based on this Blog IE9 will be changing to send the short UA string. This is a good change.

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• file reading in python

  - by Jagdev

  So my whole problem is that I have two files one with following format(for Python 2.6): #comments config = { #comments 'name': 'hello', 'see?': 'world':'ABC',CLASS=3 } This file has number of sections like this. Second file has format: [23] [config] 'name'='abc' 'see?'= [23] Now the requirement is that I need to compare both files and generate file as: #comments config = { #comments 'name': 'abc', 'see?': 'world':'ABC',CLASS=3 } So the result file will contain the values from the first file, unless the value for same attribute is there in second file, which will overwrite the value. Now my problem is how to manipulate these files using Python. Thanks in advance and for your previous answers in short time ,I need to use python 2.6

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• In need of a semantic thesaurus as a SAS

  - by Roy Peleg

  Hello, I'm currently building a web application. In one of it's key processes the application need to match short phrases to other similar ones available in the DB. The application needs to be able to match the phrase: Looking for a second hand car in good shape To other phrases which basically have the same meaning but use different wording, such as: 2nd hand car in great condition needed or searching for a used car in optimal quality The phrases are length limited (say 250 chars), user generated & unstructured. I'm in need of a service / company / some solution which can help / do these connections for me. Can anyone give any ideas? Thanks, Roy

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• Get a image from a uiview

  - by Monobono

  Hi I want to perform a shrink animation on a UITableVIew. I experimented a bit and found out that the animation runs much faster when I shrink a UIImageView with an image of the current state of the tableview instead of shrinking the table view itself. I grabbed the image in a method in my main viewcontroller prior to the animation: UIGraphicsBeginImageContext(mainTableView.bounds.size); [resizeContainer.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); Works like a charm, at least almost. On very rare occasions I get weird graphic glitches, where the UIImage starts to overlap a toolbar that lies underneath it. I just want to make sure that I am getting the image in the right way. I am laking the necessary understand of GraphicContexts to be sure about it. To cut a long story short, is my code correct? Thx

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• silverlight for .NET / CLR based numerical computing on osx

  - by Jonathan Shore

  I'm interested in using F# for numerical work, but my platforms are not windows based. Mono still has a significant performance penalty for programs that generate a significant amount of short-lived objects (as would be typical for functional languages). Silverlight is available on OSX. I had seen some reference indicating that assemblies compiled in the usual way could not be referenced, but not clear on the details. I'm not interested in UIs, but wondering whether could use the VM bundled with silverlight effectively for execution? I would want to be able to reference a large library of numerical models I already have in java (cross-compiled via IKVM to .NET assemblies) and a new codebase written in F#. My hope would be that the silverlight VM on OSX has good performance and can reference external assemblies and native libraries. Is this doable?

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• Is there a standard Java utility to parse XSD files at runtime?

  - by Andrew

  I've been looking around for a way to programmatically parse XSD files to generate an XML mapping so that I can take any XSD file and create a parser that will parse any XML file that conforms to it, and my google-fu has been coming up short. XSOM looks promising, as it will parse an XSD file and make all its attributes available in a straight forward way. Are there any other options or standard libraries available that will produce an XML file parser from an XSD file? [Conclusion] Thanks everyone for your responses, they were a real help. I was able to write implementations using JAXP, Eclipses EMF and in XSOM that all worked as desired. JAXP was very straight forward and easy to learn and do. EMF was actually a pain to get going properly, there were so many jars that had to be included for it to work standalone that I would not recommend it. XSOM was even simpler than the JAXP implementation, so I went with it in the end.

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• TCP Flow control in AS3?

  - by Jeremy Stanley

  I am currently working on a Flash socket client for a pre-existing service/standard. The service uses TCP flow control to throttle itself and the Flash socket is reading in everything as fast as it can despite not being able to process it as fast as it's being taken in. This causes the bytesAvailable on the socket to keep increasing and the server never knows that the client has fallen behind. In short, is there any way to limit the size of bytesAvailable for a Flash Socket object or throttle it in some other way? Note: Rewriting the server isn't a viable option at the current time as it's a standard and the client's utility drops immensely if server-side changes are needed

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• Strong name a 3rd party Interop DLL

  - by mauro.dec

  Hello! I have a 3rd party library I need to use. this library however, is not signed, so I used Signer to strong name it. One of its dependencies is an Interop library (also provided by the 3rd party) which I cannot sign since it seems to have unmanaged code. At runtime, when the 3rd party code needs to load the Interop library it fails to do so for not being signed. In short, Is there a way for me to sign a 3rd party Interop DLL? I've done a lot of searching but still couldn't find a solution.

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• Copy Structure To Another Program

  - by Steven

  Long story, long: I am adding a web interface (ASPX.NET: VB) to a data acquisition system developed with LabVIEW which outputs raw data files. These raw data files are the binary representation of a LabVIEW cluster (essentially a structure). LabVIEW provides functions to instantiate a class or structure or call a method defined in a .NET DLL file. I plan to create a DLL file containing a structure definition and a class with methods to transfer the structure. When the webpage requests data, it would call a LabVIEW executable with a filename parameter. The LabVIEW code would instantiate the structure, populate the structure from the data file, then call the method to transfer the data back to the website. Long story, short: How do you recommend I transfer (copy) an instance of a structure from one .NET program to a VB.NET program? Ideas considered: sockets, temp file, xml file, config file, web services, CSV, some type of serialization, shared memory

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• How can I play compressed sound files in C# in a portable way?

  - by skolima

  Is there a portable, not patent-restricted way to play compressed sound files in C# / .Net? I want to play short "jingle" sounds on various events occuring in the program. System.Media.SoundPlayer can handle only WAV, but those are typically to big to embed in a downloadable apllication. MP3 is protected with patents, so even if there was a fully managed decoder/player it wouldn't be free to redistribute. The best format available would seem to be OGG Vorbis, but I had no luck getting any C# Vorbis libraries to work (I managed to extract a raw PCM with csvorbis but I don't know how to play it afterwards). I neither want to distribute any binaries with my application nor depend on P/Invoke, as the project should run at least on Windows and Linux. I'm fine with bundling .Net assemblies as long as they are license-compatible with GPL. [this question is a follow up to a mailing list discussion on mono-dev mailing list a year ago]

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• Specifying location of new inlineshape in Word VBA?

  - by Branan

  I'm working on a document "wizard" for the company that I work for. It's a .dot file with a header consisting of some text and some form fields, and a lot of VBA code. The body of the document is pulled in as an OLE object from a separate .doc file. Currently, this is being done as a Shape, rather than an InlineShape. I did this because I can absolutely position the Shape, whereas the InlineShape always appears at the beginning of the document. The problem with this is that a Shape doesn't move when the size of the header changes. If someone needs to add or remove a line from the header due to a special case, they also need to move the object that defines the body. This is a pain, and I'd like to avoid it if possible. Long story short, how do I position an InlineShape using VBA in Word? Oh, and this is for a 10-year-old system setup, so Office '97.

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• How to Set a gridview column width when binding to a datatable

  - by Bob Avallone

  I am binding a table to a gridview in asp.net as such grdIssues.DataSource = mdtIssues; grdIssues.DataBind(); The problem is I cannot then control the column width, asp.net seems to decided on it's own what width each column should be. Methods such as grdIssues.Columns[0].ItemStyle.Width = 100; grdIssues.Columns[1].ItemStyle.Width = 100; don't work because the columns are created dynamically. I cannot believe there isn't a way to do this short of manually creating each column and filling each row. Regards, Bob Avallone

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• Googles App Engine, Python: How to get parameters from a log-in pages?

  - by brilliant

  Here is a quote from here: So in short ... you need to look into login page, see what params it uses e.g login=xxx, password=yyy, post it to that page and you will have to manage the cookies too, that is where library like twill etc come into picture. How could I do it using Python and Google App Engine? Can anybody please give me some clue? I have already asked a question about the authenticated request, but here it seems the matter is different as here I am suggested to look into login page and get parameters, and also I have to deal with cookies.

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• Recommended Model Based Testing Tools

  - by ModelTester

  Does anyone have any suggestions on what Model Based Testing Tools to use? Is Spec Explorer/SPEC# worth it's weight in tester training? What I have traditionally done is create a Visio Model where I call out the states and associated variables, outputs and expected results from each state. Then in a completely disconnected way, I data drive my test scripts with those variables based on that model. But, they are not connected. I want a way to create a model, associate the variables in a business friendly way, that will then build the data parameters for the scripts. I can't be the first person to need this. Is there a tool out there that will do basically that? Short of developing it myself.

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• Localize node texts in treeview using resource files

  - by Obalix

  For a project I need a tree view that allows the user to select a module, which then is displayed in a content area. The project relies heavily on localization and this is provided by the resource files. Now I discovered today, that the text that are assigned to preset tree view nodes are not contained in the resource files. So the question is whether there is a way of doing this, short of mapping the elemenst in code. I.e. assigning a name to the node, running over all nodes and pulling the resources from the resouce manager based on the node name. This is what I am currently doing, however, it just doesn't "feel" right: private void TranslateNodes(TreeNodeCollection treeNodeCollection) { var rm = Resources.ResourceManager; foreach (TreeNode node in treeNodeCollection) { node.Text = rm.GetString(node.Name + "_Text"); this.TranslateNodes(node.Nodes); } } Thanks!

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• Make compiler copy characters using movsd

  - by Suma

  I would like to copy a relatively short sequence of memory (less than 1 KB, typically 2-200 bytes) in a time critical function. The best code for this on CPU side seems to be rep movsd. However I somehow cannot make my compiler to generate this code. I hoped (and I vaguely remember seeing so) using memcpy would do this using compiler built-in instrinsic, but based on disassembly and debugging it seems compiler is using call to memcpy/memmove library implementation instead. I also hoped the compiler might be smart enough to recognize following loop and use rep movsd on its own, but it seems it does not. char *dst; const char *src; // ... for (int r=size; --r>=0; ) *dst++ = *src++; Is there some way to make the Visual Studio compiler to generate rep movsd sequence other than using inline assembly?

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• How do you comment html templates in Php (in a practical way) ?

  - by faB

  Is there a simple solution to do the equivalent of Java's comments: <%-- this is a comment inside a template, it does not appear in the output HTML --%> Even if you use short php tags, you still have to wrap the comments with comment syntax, on top of the php tags: <? /* this is a comment of the html template */ ?> I'm considering doing some kind of filter on the output templates, to remove all html comments, or better yet, custom comments like the Java syntax above, but how would you do that in the most efficient way? You'd have to run a regexp right? The reason for my question is simply that in a MVC framrwork, using components, and re-usable html templates (think YUI), I need to document clearly those templates, in a readable way..

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