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• Silverlight File download from client

  - by luke

  I have a Silverlight application that implements some basic CRUD operations on a fairly flat data set. The application loads all the data onto the client to allow for quick editing (this is a fairly small data set no more that a couple K). I would like to allow them to download the file as a CSV so they can edit the data locally. I know i can set up a HyperLink button to a URL on my webserver and then server the data dynamically using a custom server handler. But this seems kind of roundabout to me because the all the data is already all on the Client's machine (because the Silverlight application loaded it). So i was wondering if there was a way to prompt the user for a file download and then dynamically generate the file download stream from Silverlight?

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• Google Charts Through CURL

  - by swt83

  I have a PHP class that helps me generate URLs for custom charts using Google Chart service. These URLs work fine when I load them in my browser, but I'm trying to pull them using CURL so I can access the charts on secure https websites. Whenever I try and pull a chart via CURL, I get an Error 400 Bad Request. Any idea on how to get around this? Everything I have tried has failed. $url = urldecode($_GET['url']); $session = curl_init($url); // Open the Curl session curl_setopt($session, CURLOPT_HEADER, false); // Don't return HTTP headers curl_setopt($session, CURLOPT_RETURNTRANSFER, true); // Do return the contents of the call $image = curl_exec($session); // Make the call #header("Content-Type: image/png"); // Set the content type appropriately curl_close($session); // And close the session die($image);

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• Additional spaces in String having read text file to String using FileInputStream

  - by David

  Hi, I'm trying to read in a text file to a String variable. The text file has multiple lines. Having printed the String to test the "read-in" code, there is an additional space between every character. As I am using the String to generate character bigrams, the spaces are making the sample text useless. The code is try{ FileInputStream fstream = new FileInputStream(textfile); DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); //Read corpus file line-by-line, concatenating each line to the String "corpus" while ((strLine = br.readLine()) != null) { corpus = (corpus.concat(strLine)); } in.close(); //Close the input stream } catch (Exception e) {//Catch exception if any System.err.println("Error test check: " + e.getMessage()); } I'd be grateful for any advice. Thanks.

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• Game cross-compiling and packaging

  - by Helltone

  Hi, Some friends and I wanted to develop a game. Any language will do. I've been programming in C for years, but never wrote a game before. One of us knows SDL a little bit. It would also be a nice excuse to learn Python+pygame. We wish our game to be 'standalone'. By standalone, I mean most users (at least Linux, Mac and Windows) will not have to manually download and install anything else apart from a package. It is ok if the installation automatically handles missing dependencies. If the packages contain binaries, we wish to be able to generate them using cross-compilation from Linux. How should we package and structure the project, and what language is best suited?

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• Implement password recovery best practice

  - by Enrique

  Hello I want to to implement password recovery in my web application. I'd like to avoid using secret questions. I could just send the password by e-mail but I think it would be risky. Maybe I could generate a new temporary random password and send it by e-mail but I think it is as risky as the above point. Can I send a url by e-mail for example http://mysite.com/token=xxxx where xxxx is a random token associated with the user. So when the user navigates to that url he/she can reset the password. Any ideas?

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• Problem with openssl_get_privatekey returning false

  - by Joe Corkery

  I am trying to generate a signed url for Amazon's CloudFront service but am running into problems in that the openssl_get_privatekey function appears to be returning false and I can't quite figure out why. Here is the code (PHP) that I am using: $priv_key = file_get_contents(path_to_my_pem_file); $priv_keyid = openssl_get_privatekey($privkey); Unfortunately, everytime I try this openssl_get_privatekey fails silently and I run into errors when I try to sign with openssl_sign later on. I've tried printing out the contents of $priv_key after it has been read in and it appears to be correct. I'm running this on RHEL 5.4 using PHP 5.2.13. I've confirmed that file pem file is readable and I've also run dos2unix on it just in case (didn't work before or after). Any thoughts would be greatly appreciated as I am relatively new to both PHP and openssl.

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• Importing Thawte trial certificates into a Java keystore

  - by lindelof

  Hello, I'm trying to configure a Tomcat server with SSL. I've generated a keypair thus: $ keytool -genkeypair -alias tomcat -keyalg RSA -keystore keys Next I generate a certificate signing request: $ keytool -certreq -keyalg RSA -alias tomcat -keystore keys -file tomcat.csr Then I copy-paste the contents of tomcat.csr into a form on Thawte's website, asking for a trial SSL certificate. In return I get two certificates delimited with -----BEGIN ... -----END, that I save under tomcat.crt and thawte.crt. (Thawte calls the second certificate a 'Thawte Test CA Root' certificate). When I try to import either of them it fails: $ keytool -importcert -alias tomcat -file tomcat.crt -keystore keys Enter keystore password: keytool error: java.lang.Exception: Failed to establish chain from reply $ keytool -importcert -alias thawte -file thawtetest.crt -keystore keys Enter keystore password: keytool error: java.lang.Exception: Input not an X.509 certificate Adding the -trustcacerts option to either of these commands doesn't change anything either. Any idea what I am doing wrong here?

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• Modify the filter chain - Or select servlet to respond to request using filter

  - by klonq

  I am trying to use a filter to map requests. I am trying to do this for two reasons, firstly to dynamically generate URI's and have them mapped to the appropriate servlet and secondly to catch URI's which are not registered and handle them appropriately. So I'm using a catch-all filter to process the URI and determine the response. I would like some way of modifying the filter chain, or some way to set the servlet which responds to the request from within the filter. I have been unsuccessful using filterConfig.getServletContext().getRequestDispatcher().forward() to send to jsp, ideally though I would like to map to a servlet but can't figure out how. The reason I am not doing this from within a servlet is that I have some URIs which are fixed within web.xml and if I use a catch-all servlet those URIs do not get mapped. Is this possible, is it clean or it going to get really messy?

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• SQL Server CE, Visual Studio 2008/2010 RC, and Linq-to-Sql

  - by blu

  I added an .sdf to my project, added a table, added a Linq-to-Sql dmbl, and tried to add the table to the dbml. The result was an error: "The selected object(s) are an unsupported data provider" This happens in both VS 2008 Professional SP1 and 2010 RC Ultimate. I found someone talking about using SQL Metal to generate the file, but I didn't enjoy that 2 years ago, and after a little playing around I recall why. Does anyone know if this is going to be supported in the release version? Should I abandon SQL Server CE and just use SQLite (with DbLinq)? Thanks for any insight.

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• Using Raw SQL with Doctrine

  - by Levi Hackwith

  I have some extremely complex queries that I need to use to generate a report in my application. I'm using symfony as my framework and doctrine as my ORM. My question is this: What is the best way to pass in highly-complex sql queries directly to Doctrine without converting them to the Doctrine Query Language? I've been reading about the Raw_SQL extension but it appears that you still need to pass the query in sections (like from()). Is there anything for just dumping in a bunch of raw sql commands?

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• Building XUL app a-la SongBird

  - by Ben

  Hi, I've started exploring XUL Runner as a potential tool for an upcoming app. I can get some good examples running using the command line xulrunner-bin myapp. How can compile it all in a native looking application, like SongBird does. I understand SongBird packages the entire xul runtime with it, and I'm happy with that. I'm just wondering is there are any tool I can use to compile my xul project as a standalone app? Any Mac and/or PC hint much appreciated! EDIT: I guess what I'm looking for is a way to generate a Mac and/or PC XUL stub application (but not an installer). Is there something like that? cheers Ben

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• Python Image Library: How to combine 4 images into a 2 x 2 grid?

  - by Casey

  I have 4 directories with images for an animation. I would like to take the set of images and generate a single image with the 4 images arranged into a 2x2 grid for each frame of the animation. My code so far is: import Image fluid64 = "Fluid64_half_size/00" fluid128 = "Fluid128_half_size/00" fluid512 = "Fluid512_half_size/00" fluid1024 = "Fluid1024_half_size/00" out_image = "Fluid_all/00" for pic in range(1, 26): blank_image = Image.open("blank.jpg") if pic < 10: image_num = "0"+str(pic) else: image_num = str(pic) image64 = Image.open(fluid64+image_num+".jpg") image128 = Image.open(fluid128+image_num+".jpg") image512 = Image.open(fluid512+image_num+".jpg") image1024 = Image.open(fluid1024+image_num+".jpg") out = out_image + image_num + ".jpg" blank_image.paste(image64, (0,0)).paste(fluid128, (400,0)).paste(fluid512, (0,300)).paste(fluid1024, (400,300)).save(out) Not sure why it's not working. I'm getting the error: Traceback (most recent call last): File "C:\Users\Casey\Desktop\Image_composite.py", line 24, in <module> blank_image.paste(image64, (0,0)).paste(fluid128, (400,0)).paste(fluid512, ( ste(fluid1024, (400,300)).save(out) AttributeError: 'NoneType' object has no attribute 'paste' shell returned 1 Any help would be awesome. Thanks!

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• Java Media Framework always generating multicast packets with TTL=1

  - by Liam

  I need to generate a G711 multicast audio stream, and came across the AVTransmit2 sample as part of the Java Media Framework. Fundementally this works, however the multicast packets all have TTL set to 1. I found some documentation that suggested the SessionAddress could specify a TTL value, so I've tried changing that i.e. destAddr = new SessionAddress( ipAddr, port, 255); I also found some comments that the problems might be due to java defaulting to IPv6, so I've tried to force it to ipv4 by starting it like this: java -Djava.net.preferIPv4Stack=true -classpath "." AVTransmit2 javasound://8000 239.1.10.65 20480 However looking in wireshark, the packets still have TTL=1 I'm using JMF2.1.1e Any suggestions how to resolve this?

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• Filter Queryset in Django inlineformset_factory

  - by Dave

  I am trying to use inlineformset_factory to generate a formset. My models are defined as: class Measurement(models.Model): subject = models.ForeignKey(Animal) experiment = models.ForeignKey(Experiment) assay = models.ForeignKey(Assay) values = models.CommaSeparatedIntegerField(blank=True, null=True) class Experiment(models.Model): date = models.DateField() notes = models.TextField(max_length = 500, blank=True) subjects= models.ManyToManyField(Subject) in my view i have: def add_measurement(request, experiment_id): experiment = get_object_or_404(Experiment, pk=experiment_id) MeasurementFormSet = inlineformset_factory(Experiment, Measurement, extra=10, exclude=('experiment')) if request.method == 'POST': formset = MeasurementFormSet(request.POST,instance=experiment) if formset.is_valid(): formset.save() return HttpResponseRedirect( experiment.get_absolute_url() ) else: formset = MeasurementFormSet(instance=experiment) return render_to_response("data_entry_form.html", {"formset": formset, "experiment": experiment }, context_instance=RequestContext(request)) but i want to restrict the Measurement.subject field to only subjects defined in the Experiment.subjects queryset. I have tried a couple of different ways of doing this but I am a little unsure what the best way to accomplish this is. I tried to over-ride the BaseInlineFormset class with a new queryset, but couldnt figure out how to correctly pass the experiment parameter.

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• Can GhostScript run in Medium Trust

  - by SkippyFire

  I am using GhostScript to generate some thumbnails of PDF pages in an ASP.NET application. I have it wrapped in this library called GhostScriptSharp that just uses DllImport to call methods in the GhostScript DLL. It looks like this wont work on a medium trust hosting environment, either because of the fact that it is calling unmanaged code, or that it looks like the library is creating files all over the place (outside my virtual directory). I ran Process Monitor and saw it trying to Read, QueryNameInformationFile, CreateFile and QueryStandardInformationFile in places like: C:\WINDOWS\system32\Halftone\Default or C:\gs\gs8.63\lib\Halftone\Default or C:\gs\font\Halftone\Default Any ideas about whether this is "fixable" to run in medium trust? If I can't use GhostScript, is there another free/open source library that WILL work in Medium trust?

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• Certificate Trust Lists and IIS7

  - by Neil Deadman

  I need to generate a CTL for use with IIS7. I generated a CTL file using MakeCTL (on Win2k3 SDK) and put only my own RootCA certificate in the CTL. However, when I then use adsutil.vbs to set my website to use this CTL, I get: ErrNumber: -2147023584 (0x80070520) Error Trying To SET the Property: SslCtlIdentifier I'm using adsutil.vbs like this: cscript adsutil.vbs set w3svc/2/SslCtlIdentifier where is the friendly name of the CTL The problem is, I am not able to set a friendly name. At the end of the wizard it says "Friendly Name: ". In IIS6 I can create a CTL with a friendly name (showing in Certificates MMC) but if I export it from there, when I import it, it no longer has a friendly name. Can anyone show me how to do it please?

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• Extending Perforce to use a custom content diff tool for certain file extensions

  - by Fraser Graham

  I have various custom binary files stored in perforce and for many of the file types I have built a custom diff tool to show the content creators a diff of the actual changes to the file. E.g. If the file holds simple key value pairs as a compressed binary blob the diff tool would load each version into an in memory format and generate a list of additions, deletions and edits to the file presented in a nice clean report view. Much like the built in image diff tool in P4V i'd like to be able to use my own diff tool for certain file extensions within my depot and allow the users to use the existing P4V interface to pick revisions to diff between and examine history. So, I am aware you can write add-ins to P4V but I can't find any documentation on it and I'd like to know if this kind of extension functionality is available in P4V and how to use it?

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• How do boost operators work?

  - by FredOverflow

  boost::operators automatically defines operators like + based on manual implementations like += which is very useful. To generate those operators for T, one inherits from boost::operators<T> as shown by the boost example: class MyInt : boost::operators<MyInt> I am familiar with the CRTP pattern, but I fail to see how it works here. Specifically, I am not really inheriting any facilities since the operators aren't members. boost::operators seems to be completely empty, but I'm not very good at reading boost source code. Could anyone explain how this works in detail? Is this mechanism well-known and widely used?

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• Eclipse Pydev: Supress no-self errors in python wrappers generated with swig

  - by Christian

  Hi, when generating python wrappers with swig the python wrapper classes in the generated python file do not have an explicit self parameter, for example see below: class PySwigIterator(_object): def value(*args): return _spatiotemporalnmf.PySwigIterator_value(*args) def incr(*args): return _spatiotemporalnmf.PySwigIterator_incr(*args) def decr(*args): return _spatiotemporalnmf.PySwigIterator_decr(*args) def distance(*args): return _spatiotemporalnmf.PySwigIterator_distance(*args) I am developing with the eclipse pluging Pydev. Pydev always shows an error when it detects a method without explicit self parameter. I am aware of two methods to get rid of the errors: First, disable error checking for the whole project in the Pydev preferences. Second, add a #@NoSelf to every line with an error. I don't want to use the first one, because I still want to get error warnings for my non-swig-generated files. Obviously the second one is also not very good, because I would have to do it by hand and every time I generate the file again, all #@NoSelfs will be gone. My Question now is, is there a better way to achieve this? Thanks

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• Designing a data model in VS2010 and generating ORM code, application

  - by Kay Zed

  Simply put: I have a database design in my head and I now want to use Visual Studio 2010 to create a WPF application. Key is to use the VS2010 tools to take much as possible manual work out of my hands. -The database engine is SQLite -ORM probably through DBLINQ -Use of LINQ -The application can create new, empty database instances -Easily maintainable (changes in data model possible) Q- How do I start designing the database model (visually) in Visual Studio 2010? Should this be an xsd? Do I do this in a separate project? Q- Next, how can I make the most use of VS2010 code generation tools to generate a business layer? Q- I suppose the business layer will be added as a Data Source (in another project?) and from there it's a rather generic data binding solution? I tried finding clear examples of this but it's a jungle out there, the hunt for a solution is NOT converging to one clear method.... :_(

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• djb2 Hash Function

  - by Jainish

  I am using the djb2 algorithm to generate the hash key for a string which is as follows hash(unsigned char *str) { unsigned long hash = 5381; int c; while (c = *str++) hash = ((hash << 5) + hash) + c; /* hash * 33 + c */ return hash; } Now with every loop there is a multiplication with two big numbers, After some time with the 4th of 5th character of the string there is a overflow as the hash value becomes huge What is the correct way to refactor so that the hash value does not overflow and the hashing also happens correctly

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• WebBrowser control not submitting form, IE 7 works

  - by Joel Cunningham

  We are using a WebBrowser control in our win forms application which is running in terminal services. IE 7 is the browser that is installed for the session. We are using WebForms to generate the web pages. If we try and submit a web page in the WebBrowser control it does not work. The submit button does not push down. If we try and submit a web page in IE 7 that is installed on the same machine it works as expected. This is only an issue for one person. The WebBrowser control is working for other users. Any thoughts on how I can debug why the submit button is not submitting for the WebBrowser control? Thanks in advance.

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• Sending persisted JDO instances over GWT-RPC

  - by Ben Daniel

  I've just started learning Google Web Toolkit and finished writing the Stock Watcher tutorial app. Is my thinking correct that if one wants to persist a business object (like a Stock) using JDO and send it back and forth to/from the client over RPC then one has to create two separate classes for that object: One with the JDO annotations for persisting it on the server and another which is serialisable and used over RPC? I notice the Stock Watcher has separate classes and I can theorise why: Otherwise the gwt compiler would try to generate javascript for everything the persisted class referenced like JDO and com.google.blah.users.User, etc Also there may be logic on the server-side class which doesn't apply to the client and vice-versa. I just want to make sure I'm understanding this correctly. I don't want to have to create two versions of all my business object classes which I want to use over RPC if I don't have to.

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• Visual Studio 2010: adding a service reference to a 2008 generated wsdl

  - by Snake

  Doesn't produce a app.config . In my team there is a guy who has Visual Studio 2008, he created a webservice. Then there is me, adding this webservice to a console project. Adding the service reference goes without problems but no valid app.config is generated. It's just empty <configuration> </configuration> When I disable 'reuse types' in my service reference it works but then I get an ambiguous error. Is this a bug? I found http://stackoverflow.com/questions/2159107/visual-studio-does-not-generate-app-config-content-when-add-service-reference this one, but there is no solution there, so I thought I bump the problem up again. Thanks

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• Real world uses of Reflection.Emit

  - by Ryu

  In all the books I've read on reflection they often say that there aren't many cases where you want to generate IL on the fly, but they don't give any examples of where it does make sense. After seeing Reflection.Emit as a job requirement for a gaming company I was curious where else it's being used. I'm now wondering if there are any situations you've seen in the real world were it was the best solution to the problem. Perhaps it is used as an implementation to a design pattern? Note I imagine PostSharp / AOP uses it.

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