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• Evolutionary Algorithms: Optimal Repopulation Breakdowns

  - by Brian MacKay

  It's really all in the title, but here's a breakdown for anyone who is interested in Evolutionary Algorithms: In an EA, the basic premise is that you randomly generate a certain number of organisms (which are really just sets of parameters), run them against a problem, and then let the top performers survive. You then repopulate with a combination of crossbreeds of the survivors, mutations of the survivors, and also a certain number of new random organisms. Do that several thousand times, and efficient organisms arise. Some people also do things like introduce multiple "islands" of organisms, which are seperate populations that are allowed to crossbreed once in awhile. So, my question is: what are the optimal repopulation percentages? I have been keeping the top 10% performers, and repopulating with 30% crossbreeds and 30% mutations. The remaining 30% is for new organisms. I have also tried out the multiple island theory, and I'm interested in your results on that as well. It is not lost on me that this is exactly the type of problem an EA could solve. Are you aware of anyone trying that? Thanks in advance!

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• Jinja2 returns "None" string for Google App Engine models

  - by Brian M. Hunt

  Google App Engine models, likeso: from google.appengine.ext.db import Model class M(): name = db.StringProperty() Then in a Jinja2 template called from a Django view with an in instance of M passed in as m: The name of this M is {{ m.name }}. When m is initialized without name being set, the following is printed: The name of this M is None. The preferable and expected output (and the output when using Django templates) would be/is: The name of this M is . Do you know why this is happening, and how to get the preferred & expected output?

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• How to Route /About to /Home/About

  - by Brian Boatright

  Just getting started with ASP.NET MVC and it's great! But I don't quit understand setting up routes. How do I route ~/About to ~/Home/About? /Views/Home/About.aspx I would like to be able to access it with /Home/About or just /About

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• Paging with Find using Active Record

  - by Brian Rizzo

  I can't seem to find an answer to this question or a good example of how to accomplish what I am trying to do. I'm sure it's been posted or explained somewhere, but I am having trouble finding the exact solution I need. I am using ActiveRecord in Subsonic 3.0.0.3. When I do something like recordset = VehicleModel.Find(x => x.Model.StartsWith(SearchText)); I get back an IList of VehicleModel objects (or more simply a recordset), this is fine until I return too many records. I also cannot order the returned set of records (my grid will do this fine, but i'm sure it will be too slow if i have too many records). Being that Find is returning an IList there isn't much that I can run directly against this (again I may be overlooking something simple so please don't kill me). My question is can someone explain how to find data like i am above, sort it and get a page of data where a page is of size n? Am I going about this wrong? Am I even close to being on the right track?

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• Backbone.js not registering Model.hasChanged event

  - by Brian M. Hunt

  Hello, I'm trying to get a View in Backbone.js to save when there's a 'change' event if (and only if) the data has changed. Long story short, I've a 'change' event set on the View that calls this: function changed_event() { log.debug("Before: " + this.model.get('name')) // not 'contrived!' this.model.set({'name': 'contrived!'}); log.debug("After: " + this.model.get('name')) // 'contrived!' if (this.model.hasChanged()) { alert("This is never called."); } } I'd like to know why the model.hasChanged() is false when clearly the model has been changed. I'm not sure what other information is necessary, but if there is more information that may be helpful please comment and I'll elaborate. Thank you for reading.

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• Spring, Jersey and Viewable JSP Integration

  - by Brian D.

  I'm trying to integrate Spring 3.0.5 with Jersey 1.4. I seem to have everything working, but whenever I try and return a Viewable that points to a JSP, I get a 404 error. When I wasn't using spring I could use this filter: <filter> <filter-name>Jersey Filter</filter-name> <filter-class>com.sun.jersey.spi.container.servlet.ServletContainer</filter-class> <init-param> <param-name>com.sun.jersey.config.feature.Redirect</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>com.sun.jersey.config.property.packages</param-name> <param-value>cheetah.frontend.controllers</param-value> </init-param> <init-param> <param-name>com.sun.jersey.config.feature.FilterForwardOn404</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>com.sun.jersey.config.property.WebPageContentRegex</param-name> <param-value>/(images|css|jsp)/.*</param-value> </init-param> </filter> And I could return a Viewable to any JSP's, image, css that were stored in the appropriate folder. However, now that I have to use the SpringServlet to get spring integration, I'm at a loss for how to access resources, since I can't use the filter above. I've tried using this servlet mapping with no luck: <servlet> <servlet-name>jerseyspring</servlet-name> <servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class> <load-on-startup>1</load-on-startup> <init-param> <param-name>com.sun.jersey.config.property.WebPageContentRegex</param-name> <param-value>/(images|css|jsp)/.*</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>jerseyspring</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> Does anyone know the proper configurations to achieve this? Thanks for any help.

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• Is it possible to use OAuth starting from the service provider website?

  - by Brian Armstrong

  I want to let people create apps that use my API and authenticate them with OAuth. Normally this process starts from the consumer service website (say TwitPic) and they request an access token from the service provider (Twitter). The user is then taken to the service provider website where they have to allow/deny access to to the consumer. I'm wondering if it's possible to initiate this process from the service provider website instead. So in this example you would start on Twitter's site, and maybe there is a section marked "do you want to turn on access for TwitPic?". If you click yes, it passes the access token directly to TwitPic which now has access to your account. Basically, fewer steps. I'm looking at the OAuth docs and it looks like the request token is generated on the consumer side and used later to turn it into an access token. So it's not really designed with what I described above in mind, but I thought there might be a way. http://oauth.net/core/1.0/ (Search for "steps") Thanks!

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• Adding custom valiadtion to ASP.NET controls

  - by Brian

  We're trying to build a simple asp control for some clients where they can just drop in a single block - i.e. <captcha:CaptchaControl ID="CaptchaControl1" runat="server" Server="http://localhost:51947/" /> and have it render the control. The catch is that I can't get this to include custom validation. Right now I'm using the RenderContents function to display the layout of the control itself as well as hook it up the to Javascript. The problem is that I don't know how to get custom validation to fire when used as part of a control. protected override void RenderContents(HtmlTextWriter output) { output.Write(@" <script type=""text/javascript"" src=""http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js""></script> <link rel=""stylesheet"" type=""text/css"" href=""/Layout/CaptchaLayout.css"" /> //etc <asp:Textbox id=""text1"" runat=""server"" text=""""></asp:Textbox> <asp:CustomValidator id=""CustomValidator2"" runat=""server"" ControlToValidate = ""text1"" ErrorMessage = ""You must enter at least 8 characters!"" ClientValidationFunction=""validateLength"" > </asp:CustomValidator>" ); } Any suggestions for a better way to do this?

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• C# .NET MVC Call an action from another controller

  - by Brian

  I have two different objects: contracts, and task orders. My requirements specify that in order to view the Details for either object, the Url should be "http://.../Contract/Details" or "http://.../TaskOrder/Details" depending on which type. They are both very similar and the details pages are almost identical, so I made a class that can either be a contract or a task order, and has a variable "objectTypeID" that says which type it is. I wrote the action "Details" in the task order controller, but now I want to call that from the contract controller instead of recopying the code. So is there any way to have the url still say ".../Contract/Details" but call the action in the TaskOrder controller instead? I tried using TaskOrderController TOController = new TaskOrderController(); TOController.Details(id); This would have worked except that I can't use the HttpContext.Session anymore, which I used several times in the action.

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• Ibatis startBatch() only works with SqlMapClient's own start and commit transactions, not with Sprin

  - by Brian

  Hi, I'm finding that even though I have code wrapped by Spring transactions, and it commits/rolls back when I would expect, in order to make use of JDBC batching when using Ibatis and Spring I need to use explicit SqlMapClient transaction methods. I.e. this does batching as I'd expect: dao.getSqlMapClient().startTransaction(); dao.getSqlMapClient().startBatch(); int i = 0; for (MyObject obj : allObjects) { dao.storeChange(obj); i++; if (i % DB_BATCH_SIZE == 0) { dao.getSqlMapClient().executeBatch(); dao.getSqlMapClient().startBatch(); } } dao.getSqlMapClient().executeBatch(); dao.getSqlMapClient().commitTransaction(); but if I don't have the opening and closing transaction statements, and rely on Spring to manage things (which is what I want to do!), batching just doesn't happen. Given that Spring does otherwise seem to be handling its side of the bargain regarding transaction management, can anyone advise on any known issues here? (Database is MySQL; I'm aware of the issues regarding its JDBC pseudo-batch approach with INSERT statement rewriting, that's definitely not an issue here)

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• berkeley DB: can't compile c++ codes

  - by Brian

  When I compiled the sample codes of C++, I got following info: c++ excxx_example_database_read.cpp -o dbApp -I /usr/local/BerkeleyDB.5.0/include/ Undefined symbols: "Dbt::Dbt(void*, unsigned int)", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbc::get(Dbt*, Dbt*, unsigned int)", referenced from: show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbc::close()", referenced from: show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbt::~Dbt()", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Db::~Db()", referenced from: MyDb::~MyDb() in ccnaWItX.o MyDb::~MyDb() in ccnaWItX.o "typeinfo for DbException", referenced from: GCC_except_table3 in ccnaWItX.o GCC_except_table4 in ccnaWItX.o GCC_except_table5 in ccnaWItX.o GCC_except_table6 in ccnaWItX.o __ZTI11DbException$non_lazy_ptr in ccnaWItX.o "DbException::~DbException()", referenced from: __ZN11DbExceptionD1Ev$non_lazy_ptr in ccnaWItX.o "MyDb::close()", referenced from: MyDb::~MyDb() in ccnaWItX.o "MyDb::MyDb(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool)", referenced from: _main in ccnaWItX.o _main in ccnaWItX.o _main in ccnaWItX.o "Dbt::Dbt()", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "DbException::get_errno() const", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o _main in ccnaWItX.o "DbException::DbException(DbException const&)", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o ld: symbol(s) not found collect2: ld returned 1 exit status I have no idea what is the problem. Please help!

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• NSPredicate case-insensitive matching on to-many relationship

  - by Brian Webster

  I am implementing a search field where the user can type in a string to filter the items displayed in a view. Each object being displayed has a keywords to-many relationship, and I would like to be able to filter the objects based on their keywords. Each keyword object has a name property, so I've set up an NSPredicate to do the filtering that looks like this: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS %@", self.searchString]; This works, but the problem is that the search is case-sensitive, so if the keyword has a capital letter but the user types in all lowercase, no matches are found. I've tried the following modification: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS[c] %@", self.searchString]; But that doesn't make any difference in the case sensitivity of the matching. Is there a way to do this case-insensitive matching using just a plain predicate? Or will I need to implement some sort of custom accessor on the keyword class, e.g. write a lowercaseName method and match against a lowercased version of the search string instead? Addendum: After further exploration, the workaround of adding a custom accessor works OK for manual use of NSPredicate, but does not work at all when using NSFetchRequest with Core Data, which only works when querying attributes defined in the Core Data model.

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• Resolve http form post as https form post

  - by Brian David Berman

  Is there a way to force a non-secure form post to be secure? I understand there are ways to automatically resolve an http URL as an https URL but with form posts, is this type of redirection too late? Will the posted data have already gone through the wire as plain text?

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• Strong name, Manifest, and Code Signing

  - by Brian

  What order should these be done in? I'm doing this from the command prompt for a .Net app. I was able to do just strong name and code signing successfully, but when I tried all three, it doesn't look like it worked (== Vista still trying to run the app with elevated privileges resulting in a prompt, though I set the requestedexecutionlevel at asInvoker) Thanks in advance

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• How should I clean up hung grandchild processes when an alarm trips in Perl?

  - by brian d foy

  I have a parallelized automation script which needs to call many other scripts, some of which hang because they (incorrectly) wait for standard input. That's not a big deal because I catch those with alarm. The trick is to shut down those hung grandchild processes when the child shuts down. I thought various incantations of SIGCHLD, waiting, and process groups could do the trick, but they all block and the grandchildren aren't reaped. My solution, which works, just doesn't seem like it is the right solution. I'm not especially interested in the Windows solution just yet, but I'll eventually need that too. Mine only works for Unix, which is fine for now. I wrote a small script that takes the number of simultaneous parallel children to run and the total number of forks: $ fork_bomb <parallel jobs> <number of forks> $ fork_bomb 8 500 This will probably hit the per-user process limit within a couple of minutes. Many solutions I've found just tell you to increase the per-user process limit, but I need this to run about 300,000 times, so that isn't going to work. Similarly, suggestions to re-exec and so on to clear the process table aren't what I need. I'd like to actually fix the problem instead of slapping duct tape over it. I crawl the process table looking for the child processes and shut down the hung processes individually in the SIGALRM handler, which needs to die because the rest of real code has no hope of success after that. The kludgey crawl through the process table doesn't bother me from a performance perspective, but I wouldn't mind not doing it: use Parallel::ForkManager; use Proc::ProcessTable; my $pm = Parallel::ForkManager->new( $ARGV[0] ); my $alarm_sub = sub { kill 9, map { $_->{pid} } grep { $_->{ppid} == $$ } @{ Proc::ProcessTable->new->table }; die "Alarm rang for $$!\n"; }; foreach ( 0 .. $ARGV[1] ) { print "."; print "\n" unless $count++ % 50; my $pid = $pm->start and next; local $SIG{ALRM} = $alarm_sub; eval { alarm( 2 ); system "$^X -le '<STDIN>'"; # this will hang alarm( 0 ); }; $pm->finish; } If you want to run out of processes, take out the kill. I thought that setting a process group would work so I could kill everything together, but that blocks: my $alarm_sub = sub { kill 9, -$$; # blocks here die "Alarm rang for $$!\n"; }; foreach ( 0 .. $ARGV[1] ) { print "."; print "\n" unless $count++ % 50; my $pid = $pm->start and next; setpgrp(0, 0); local $SIG{ALRM} = $alarm_sub; eval { alarm( 2 ); system "$^X -le '<STDIN>'"; # this will hang alarm( 0 ); }; $pm->finish; } The same thing with POSIX's setsid didn't work either, and I think that actually broke things in a different way since I'm not really daemonizing this. Curiously, Parallel::ForkManager's run_on_finish happens too late for the same clean-up code: the grandchildren are apparently already disassociated from the child processes at that point.

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• Is Guava's ImmutableList.Builder thread safe?

  - by Brian Harris

  What are the thread safety guarantees for Guava's ImmutableList.Builder? The javadocs don't say.

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• Producing CCITT compressed TIFF from CGImage

  - by Brian Postow

  I have a CGImage (core graphics, C/C++). It's grayscale. Well, originally it was B/W, but the CGImage may be RGB. That shouldn't matter. I want to create a CCITT-Group 4 TIFF. I can create an LZW TIFF (grayscale or color) via creating a destination with the correct dictionary and adding the image in. No problem. However, there doesn't seem to be an equivalent kCGImagePropertyTIFFCompression value to represent CCITT-4. It should be 4, but that produces uncompressed. I have a manual CCITT compression routine, so if I can get the binary (1 bit per pixel) data, I'm set. But I can't seem to get 1 BPP data out of a CGImage. I have code that is supposed to put the CGImage into a CGBitmapContext and then give me the data, but it seems to be giving me all black. I've asked a couple of questions today trying to get at this, but I just figured, lets ask the question I REALLY want answered and see if someone can answer it. There's GOT to be a way to do this. I've got to be missing something dumb. What is it?

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• Issue with CAAnimation and CALayer Transforms

  - by Brian

  I have a CALayer that I want to animate across the screen. I have created two methods: one slide open the layer and one to slide close. These both work by assigning a property to the layer's transform property. Now I want to use a CAKeyFrameAnimation to slide open the layer. I got this working so the layer slides open, but now I can't slide the layer close using my old method. I am trying to figure out why this is. Any help would be great. Code: - (id)init { if( self = [super init] ) { bIsOpen = NO; closeTransform = self.transform; openTransform = CATransform3DMakeTranslation(-235.0, 0.0, 0.0); } return self; } - (void)closeMenu { if( bIsOpen ) { self.transform = closeTransform; bIsOpen = !bIsOpen; } } - (void)openMenu { if( !bIsOpen ) { CAKeyframeAnimation *closeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; closeAnimation.duration = 1.0; closeAnimation.removedOnCompletion = NO; closeAnimation.fillMode = kCAFillModeForwards; closeAnimation.values = [NSArray arrayWithObjects:[NSValue valueWithCATransform3D:closeTransform],[NSValue valueWithCATransform3D:openTransform],nil]; closeAnimation.timingFunctions = [NSArray arrayWithObject:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]]; [self addAnimation:closeAnimation forKey:@"transform"]; bIsOpen = !bIsOpen; } }

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• Anyone using NoSQL databases for medical record storage?

  - by Brian Bay

  Electronic Medical records are composed of different types of data. Visit information ( date/location/insurance info) seems to lend itself to a RDMS. Other types of medical infomation, such as lab reports, x-rays, photos, and electronic signatures, are document based and would seem to be a good candidate for a 'document-oriented' database, such as MongoDB. Traditionally, binary data would be stored as a BLOB in a RDBMS. A hybrid approach using a traditional RDBMS along with a 'document-oriented' database would seem like good alternative to this. Other alternative would be something like DB2 purexml. The ultimate answer could be that 'it depends', but I really just wanted to get some general feedback/ideas on this. Is anyone using the NoSql approach for medical records?

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• Parse Text using scanner useDelimiter

  - by Brian

  Looking to parse the following text file: Sample text file: <2008-10-07text entered by user<2008-11-26additional text entered by user I would like to parse the above text so that I can have three variables: v1 = 2008-10-07 v2 = text entered by user v3 = Ted Parlor v1 = 2008-11-26 v2 = additional text entered by user v3 = Ted Parlor I attempted to use scanner and useDelimiter, however, I'm having issue on how to set this up to have the results as stated above. Here's my first attempt: enter code here import java.io.*; import java.util.Scanner; public class ScanNotes { public static void main(String[] args) throws IOException { Scanner s = null; try { //String regex = "(?<=\<)([^\*)(?=\)"; s = new Scanner(new BufferedReader(new FileReader("cur_notes.txt"))); s.useDelimiter("[<]+"); while (s.hasNext()) { String v1 = s.next(); String v2= s.next(); System.out.println("v1= " + v1 + " v2=" + v2); } } finally { if (s != null) { s.close(); } } } } The results is as follows: v1= 2008-10-07text entered by user v2=Ted Parlor What I desire is: v1= 2008-10-07 v2=text entered by user v3=Ted Parlor v1= 2008-11-26 v2=additional text entered by user v3=Ted Parlor Any help that would allow me to extract all three strings separately would be greatly appreciated.

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• Undocumented Mac Calls

  - by Brian Postow

  I'm working on a couple of mac products, and in order to do what I need to do, I'm using some calls to undocumented methods on Mac Classes. Like IKImageView's doRotate:(id) and PDFDocument's (NSPrintOperation *)getPrintOperationForPrintInfo:(NSPrintInfo *)printInfo autoRotate:(BOOL)doRotate; How common is it for Objective C programmers to use methods like this? How do you find out about them (other than Google)? How dangerous is it to use them? Is there a danger other than that Apple will make them no-longer available in some future rev, and so your program will break?

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• How to chroot Django

  - by Brian M. Hunt

  Can one run Django in a chroot? Notably, what's necessary in order to set up (for example) /var/www as a chroot'd directory and then have Django run in that chroot'd directory? Thank you - I'm grateful for any input.

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• How do I grant anonymous access to a url using FormsAuthentication?

  - by Brian Bolton

  For the most part, my webapp requires authentication to do anything. There are a few pages, namely the homepage, that I'd like people to be able to access without authenticating. Specifically, I'd like to allow anonymous access to these urls: /home /default.aspx I'm using asp.net MVC and FormsAuthentication. Both urls point to the same view: /home/index.aspx Here is my current configuration in web.config. <authentication mode="Forms"> <forms loginUrl="~/Account/LogOn" timeout="2880" /> </authentication> <authorization> <deny users="?" /> </authorization> Reading the documentation for the authorization tag, it says "Configures the authorization for a Web application, controlling client access to URL resources." It seems like I should be able to use the authorization tag to specify a url and allow access. Something like: <authentication mode="Forms"> <forms loginUrl="~/Account/LogOn" timeout="2880" /> </authentication> <authorization> <deny users="?" /> </authorization> <authorization url="/default.aspx"> <allow users="?" /> </authorization> <authorization url="/home"> <allow users="?" /> </authorization>

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• What makes Ometa special?

  - by Brian

  Ometa is "a new object-oriented language for pattern matching." I've encountered pattern matching in languages like Oz tools to parse grammars like Lexx/Yacc or Pyparsing before. Despite looking at example code, reading discussions, and talking to a friend, I still am not able to get a real understanding of what makes Ometa special (or at least, why some people think it is). Any explanation?

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• WatiN NativeElement.GetElementBounds() - What is the unit of measurement?

  - by Brian Schroer

  When I'm testing with WatiN, I like to save screenshots. Sometimes I don't really need a picture of the whole browser window though - I just want a picture of the element that I'm testing. My attempt to save a picture of an element with the code below resulted in a picture of a block box, because elementBounds.Top points to a pixel position way past the bottom of the screen. The elementBounds.Width and .Height values also appear to be about half what they should be. Is this a WatiN bug, or are these properties in a different unit of measure that I have to convert to pixels somehow? public static void SaveElementScreenshot (WatiN.Core.IE ie, WatiN.Core.Element element, string screenshotPath) { ScrollIntoView(ie, element); ie.BringToFront(); var ieClass = (InternetExplorerClass) ie.InternetExplorer; Rectangle elementBounds = element.NativeElement.GetElementBounds(); int left = ieClass.Left + elementBounds.Left; int top = ieClass.Top + elementBounds.Top; int width = elementBounds.Width; int height = elementBounds.Height; using (var bitmap = new Bitmap(width, height)) { using (Graphics graphics = Graphics.FromImage(bitmap)) { graphics.CopyFromScreen (new Point(left, top), Point.Empty, new Size(width, height)); } bitmap.Save(screenshotPath, ImageFormat.Jpeg); } }

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