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• Problem with DSL and Business Rules creation in Drools

  - by jillika iyer

  Hi, I am using Eclipse with the Drools plugin to create rules. I want to create business rules and main aim is to try and provide the user a set of options which he can use to create rules. For eg:If an Apple can have only 3 colors: I want to provide an option like a drop down so that the user can know before hand which are the options he can use in his rules. Is it possible? I am creating a dsl but unable to still provide the above functionality for a business rule. I am having an error implementing a basic dsl also. The code to add the dsl is as follows in my RuleRunner class() InputStream ruleSource = RuleRunner.class.getClassLoader().getResourceAsStream("/Rule1.dslr"); InputStream dslSource = RuleRunner.class.getClassLoader().getResourceAsStream("/sample-dsl.dsl"); //Load the rules , using DSL addRulesToThisPackage.addPackageFromDrl( new InputStreamReader(ruleSource),new InputStreamReader(dslSource)); I have both the sample-dsl .dsl and Rule1.dslr in my working directory. Error encountered at adding the dsl to the package (last line) Error stack: Exception in thread "main" java.lang.NullPointerException at java.io.Reader.<init>(Unknown Source) at java.io.InputStreamReader.<init>(Unknown Source) at com.org.RuleRunner.loadRuleFile(RuleRunner.java:96) at com.org.RuleRunner.loadRules(RuleRunner.java:48) at com.org.RuleRunner.runStatelessRules(RuleRunner.java:109) at com.org.RulesTest.main(RulesTest.java:41) my dsl file has basic mapping as per the online documentations. The dsl rule I created is: expander sample-dsl.dsl rule "A status changes B status" when There is an A - has an address There is a B - has name then - print updated A and Aaddress End I have created DSL in eclipse. Is the code I added for it to be loaded to my package correct?? Or am I missing something???? It seems like my program is unable to find the dsl? Please help. Can you point me towards the right direction to create a user friendly business rule ?? Thanks. J

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• How can I place zeroes to the left of a given number to a maximum of 6 digits including the given nu

  - by Sergio Tapia

  I have this method that receives an ID number and downloads an HTML website according to that ID. Typically, an IMDB link is like this: http://www.imdb.com/title/tt0892791/ http://www.imdb.com/title/tt1226229/ http://www.imdb.com/title/tt0000429/ They all follow the 'tt' then 7 digits, with lack of digits turning into zeroes to fill out the left spaces. How can I accomplish this using C#? I'm kind of stumped. Here's my method: /// <summary> /// Find a movie page using its precise IMDB id. /// </summary> /// <param name="id">IMDB Movie ID</param> /// <returns>Returns an HtmlDocument with the source code included.</returns> public HtmlDocument ByID(string id) { string url = String.Format("http://www.imdb.com/title/tt{0}/", id); HtmlDocument page = downloader.Load(url); return page; } Thank you very much for your time, and if you are interested in helping out, you can check out the complete source code of TheFreeIMDB here: http://thefreeimdb.codeplex.com/

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• Is there something wrong with this code? AMFReader vs AMFWriter

  - by Triynko

  Something doesn't seem right about the source code for Flash Remoting's Date(AS3) <- DateTime(.NET) stream reader/writer methods, when it comes to handling UTC <- Local times. It seems to write the DateTime data fine, including a 64-bit representation as milliseconds elapsed since Jan 1, 1970, as well as a UTC offset. public void WriteDateTime(DateTime d) { this.BaseStream.WriteByte(11); DateTime time = new DateTime(0x7b2, 1, 1); long totalMilliseconds = (long)d.Subtract(time).TotalMilliseconds; long l = BitConverter.DoubleToInt64Bits((double)totalMilliseconds); this.WriteLong(l); int hours = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Today).Hours; this.WriteShort(hours); } But when the data is read... it seems to be ignoring the short UTC offset value that was written, and appears to just discard it! private DateTime ReadDateValue() { long num2 = (long)this.ReadDouble(); DateTime time2 = new DateTime(0x7b2, 1, 1).AddMilliseconds((double)num2); int num3 = this.ReadInt16() / 60; //num3 is not used for anything! return time2; } Can anyone make sense of this? I also found some similar source code for AMFReader here, which has a ReadDateTime method, that seems to do something very similar... but goes on to use the UTC offset for something.

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• Excel 2003 VSTO convert to PDF

  - by KClough

  I have an excel workbook vsto solution that needs to generate a pdf copy of one of its sheets as output. I have a license for abcdpdf .net and tried outputting to html, then using abcpdf to convert the html to pdf, but the excel html markup tries to emulate excel with all 4 worksheets with horrible markup. It also messes up the colors (silver background across entire workbook). Any suggestions? Here is the code I'm currently using to generate the html file: FileInfo excelDoc = new FileInfo(Globals.ThisWorkbook.Path + @"\Document.html"); Globals.Sheet2.SaveAs(excelDoc.FullName, Excel.XlFileFormat.xlHtml, missing, missing, false, false, Excel.XlSaveAsAccessMode.xlNoChange, missing, missing, missing); If I hack away some of the html header tags manually, I can get abcdpf to accept it, but the formatting is a bit off and this solution seems sub optimal. Thanks in advance.

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• SQLiteDataAdapter Update method returning 0

  - by Lirik

  I loaded 83 rows from my CSV file, but when I try to update the SQLite database I get 0 rows... I can't figure out what I'm doing wrong. The program outputs: Num rows loaded is 83 Num rows updated is 0 The source code is: public void InsertData(String csvFileName, String tableName) { String dir = Path.GetDirectoryName(csvFileName); String name = Path.GetFileName(csvFileName); using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + dir + @";Extended Properties=""Text;HDR=Yes;FMT=Delimited""")) { conn.Open(); using (OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM " + name, conn)) { QuoteDataSet ds = new QuoteDataSet(); adapter.Fill(ds, tableName); Console.WriteLine("Num rows loaded is " + ds.Tags.Rows.Count); InsertData(ds, tableName); } } } public void InsertData(QuoteDataSet data, String tableName) { using (SQLiteConnection conn = new SQLiteConnection(_connectionString)) { using (SQLiteDataAdapter sqliteAdapter = new SQLiteDataAdapter("SELECT * FROM " + tableName, conn)) { using (new SQLiteCommandBuilder(sqliteAdapter)) { conn.Open(); Console.WriteLine("Num rows updated is " + sqliteAdapter.Update(data, tableName)); } } } } Any hints on why it's not updating the correct number of rows?

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• Help getting MVVM ViewModel to bind to the View

  - by cw

  Okay guys, I'm new to this model and Silverlight in general. I have the following code (changed object names, so syntax/spelling errors ignore). public class ViewModel { ViewModelSource m_vSource; public ViewModel(IViewModelSource source) { m_vSource= source; m_vSource.ItemArrived += new Action<Item>(m_vSource_ItemArrived); } void m_vSource_ItemArrived(Item obj) { Title = obj.Title; Subitems = obj.items; Description = obj.Description; } public void GetFeed(string serviceUrl) { m_vFeedSource.GetFeed(serviceUrl); } public string Title { get; set; } public IEnumerable<Subitems> Subitems { get; set; } public string Description { get; set; } } Here is the code I have in my page's codebehind. ViewModel m_vViewModel; public MainPage() { InitializeComponent(); m_vViewModel = new ViewModel(new ViewModelSource()); this.Loaded += new RoutedEventHandler(MainPage_Loaded); this.DataContext = m_vViewModel; } void MainPage_Loaded(object sender, RoutedEventArgs e) { m_vViewModel.GetItems("http://www.myserviceurl.com"); } Finally, here is a sample of what my xaml looks like. <!--TitleGrid is the name of the application and page title--> <Grid x:Name="TitleGrid" Grid.Row="0"> <TextBlock Text="My Super Title" x:Name="textBlockPageTitle" Style="{StaticResource PhoneTextPageTitle1Style}"/> <TextBlock Text="{Binding Path=Title}" x:Name="textBlockListTitle" Style="{StaticResource PhoneTextPageTitle2Style}"/> </Grid> I know I'm missing something, but I'm just not knowledgable enough which is why I'm asking you guys :) Is there anything I'm doing wrong here? Thanks!

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• Find out which row caused the error

  - by Felipe Fiali

  I have a big fat query that's written dynamically to integrate some data. Basically what it does is query some tables, join some other ones, treat some data, and then insert it into a final table. The problem is that there's too much data, and we can't really trust the sources, because there could be some errored or inconsistent data. For example, I've spent almost an hour looking for an error while developing using a customer's database because somewhere in the middle of my big fat query there was an error converting some varchar to datetime. It turned out to be that they had some sales dating '2009-02-29', an out-of-range date. And yes, I know. Why was that stored as varchar? Well, the source database has 3 columns for dates, 'Month', 'Day' and 'Year'. I have no idea why it's like that, but still, it is. But how the hell would I treat that, if the source is not trustable? I can't HANDLE exceptions, I really need that it comes up to another level with the original message, but I wanted to provide some more info, so that the user could at least try to solve it before calling us. So I thought about displaying to the user the row number, or some ID that would at least give him some idea of what record he'd have to correct. That's also a hard job because there will be times when the integration will run up to 80000 records. And in an 80000 records integration, a single dummy error message: 'The conversion of a varchar data type to a datetime data type resulted in an out-of-range datetime value' means nothing at all. So any idea would be appreciated. Oh I'm using SQL Server 2005 with Service Pack 3.

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• Rails flash hash violation of MVC?

  - by user94154

  I know Rails' flash hash is nothing new, but I keep running into the same problem with it. Controllers should be for business logic and db queries, not formatting strings for display to the user. But the flash hash is always set in the controller. This means that I need to hack and work around Rails to use Helpers that I made to format strings for the flash hash. Is this just a pragmatic compromise to MVC or am I missing something here? How do you deal with this problem? Or do you not even see it as one?

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• Excel validation range limits

  - by richardtallent

  When Excel saves a file, it attempts to combine identical Validation settings into a single rule with multiple ranges. This creates one of three issues, depending on the file type you choose to save: When saving as a standard Excel file (Office 2000 BIFF), a maximum of 1024 non-contiguous ranges that can have the same validation setting. When saving as a SpreadsheetML (Office 2002/2003 XML) file, you are limited to the number of non-contiguous ranges that can be represented, comma-delimited in R1C1 format, in 1024 characters. When saving as an Open Office XML (Office 2007 *.xlsx), there is a maximum of 511 non-contiguous ranges that can have the same validation setting. (I don't have Office 2007, I'm using the file converter for Office 2003). Once you bust any of these limits, the remaining ranges with the same Validation settings have their Validation settings wiped. For (1) and (3), Excel warns you that it can't save all of the formatting, but for (2) it does not.

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• Help Modifying Generic REST Helper PHP Example Code to Support XML DOM

  - by Jennifer Baker

  Hi! I found this example PHP source code at HTTP POST from PHP, without cURL I need some help modifying the example PHP source to support XML DOM for manipulating a REST API. I thought that if I update the CASE statement for the XML section below from $r = simplexml_load_string($res); to $r = new DOMDocument(); $r->load($res); that it would work but it doesn't. :( Any help would be appreciated. function rest_helper($url, $params = null, $verb = 'GET', $format = 'xml') { $cparams = array( 'http' => array( 'method' => $verb, 'ignore_errors' => true ) ); if ($params !== null) { $params = http_build_query($params); if ($verb == 'POST') { $cparams['http']['content'] = $params; } else { $url .= '?' . $params; } } $context = stream_context_create($cparams); $fp = fopen($url, 'rb', false, $context); if (!$fp) { $res = false; } else { // If you're trying to troubleshoot problems, try uncommenting the // next two lines; it will show you the HTTP response headers across // all the redirects: // $meta = stream_get_meta_data($fp); // var_dump($meta['wrapper_data']); $res = stream_get_contents($fp); } if ($res === false) { throw new Exception("$verb $url failed: $php_errormsg"); } switch ($format) { case 'json': $r = json_decode($res); if ($r === null) { throw new Exception("failed to decode $res as json"); } return $r; case 'xml': $r = simplexml_load_string($res); if ($r === null) { throw new Exception("failed to decode $res as xml"); } return $r; } return $res; }

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• How can I create a SQL table using excel columns?

  - by Phsika

  I need to help to generate column name from excel automatically. I think that: we can do below codes: CREATE TABLE [dbo].[Addresses_Temp] ( [FirstName] VARCHAR(20), [LastName] VARCHAR(20), [Address] VARCHAR(50), [City] VARCHAR(30), [State] VARCHAR(2), [ZIP] VARCHAR(10) ) via C#. How can I learn column name from Excel? private void Form1_Load(object sender, EventArgs e) { ExcelToSql(); } void ExcelToSql() { string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Source\MPD.xlsm;Extended Properties=""Excel 12.0;HDR=YES;"""; // if you don't want to show the header row (first row) // use 'HDR=NO' in the string string strSQL = "SELECT * FROM [Sheet1$]"; OleDbConnection excelConnection = new OleDbConnection(connectionString); excelConnection.Open(); // This code will open excel file. OleDbCommand dbCommand = new OleDbCommand(strSQL, excelConnection); OleDbDataAdapter dataAdapter = new OleDbDataAdapter(dbCommand); // create data table DataTable dTable = new DataTable(); dataAdapter.Fill(dTable); // bind the datasource // dataBingingSrc.DataSource = dTable; // assign the dataBindingSrc to the DataGridView // dgvExcelList.DataSource = dataBingingSrc; // dispose used objects if (dTable.Rows.Count > 0) MessageBox.Show("Count:" + dTable.Rows.Count.ToString()); dTable.Dispose(); dataAdapter.Dispose(); dbCommand.Dispose(); excelConnection.Close(); excelConnection.Dispose(); }

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• spam and dirty words comment post filtering in python (django)

  - by sintaloo

  Hi All, My basic question is how to filter spam and dirty words in a comment post system under python (django). I have a collection of phrases (approximately 3000 phrases) to be filtered. Question (1), are there any existing open source python (or django) package/module/plugin which can handle this job? I knew there was one called Akismet. But from what I understood, it will not solve my problem. Akismet is just a web service and filter the words dictionary defined by Akismet. But I have my own collection of words. Please correct me if I am wrong. Question (2), If there is no such open source package I can use, how to create my own one? The only thing I can think of it's to use regular expression and join all the word phrases with 'or' in a regular expression. but I have 3000 phrases, I think it won't work in term of performance and filter every comment post. any suggestions where should I start from? Thank you very much for your help and time.

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• connecting to MySQL using JDBC in eclipse

  - by Noona

  Hello, So I want to create a JDBC connection to MySQL server that is installed on my pc, here are the steps, I installed MySQL with the username and password "root", downloaded mysql-connector-java and from theere I coped the JAR "mysql-connector-java-5.1.12-bin" to "C:\Sun\SDK\jdk\jre\lib\ext", I then added it as an external JAR in my project in eclipse, now in my class I have this code: public void initialiseDatabase() { try { // Load the Driver class. Class.forName("com.mysql.jdbc.Driver"); //Create the connection using the static getConnection method databaseConnection = DriverManager.getConnection (databaseUrl+databaseName, dbUserName, dbPassword); sqlStatement = databaseConnection.createStatement(); } catch (SQLException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();} } (this is going to be psuedocode cause I am reading from a properties file and don't want the one helping me reading through long lines of code from main to figure out all the variables), where databaseUrl = "127.0.0.1" dbUserName = "root" dbPassword = "root" databaseName = "MySQL" //this one I am not sure of, do I need to create it or is it set inherenrly? now the MySQL server is up and running, but when I call the method initialiseDatabase the following exception is thrown: "java.sql.SQLException: No suitable driver found for rootroot at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at Proxy$JDBCConnection.initialiseDatabase(Proxy.java:721)" when line 721 is: sqlStatement = databaseConnection.createStatement(); Where have I gone wrong? thanks

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• Manipulate Page Theme Programatically

  - by Aren B

  I've got the following Setup in my Theme: \App_Themes\Default\StyleSheet.css \App_Themes\Default\PrintStyleSheet.css The PrintStyleSheet.css file has a set of printing css rules set in them wrapped in an @Media Print { } block. I need a way to programmatically remove the PrintStyleSheet.css from the list of css files for ASP.NET to inject based on some flags. (Some instances we want to print the site verbatim without custom formatting). I know i could build a seperate theme without the PrintStyleSheet.css in it and switch the theme programmatically, however this would introduce duplication of my master stylesheet which is not acceptable. Any ideas?

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• Nothing gets displayed when debugging Microsoft Surface

  - by leftend

  I am trying to write my first Microsoft Surface application, and am doing the development on the Surface unit itself. I successfully re-created the quick "Photos" application that is shown on the PDC Video, however, now that I'm trying to create my own app - nothing actually shows up when I run it. I'm mainly just adding ScatterViews right now - and they show up fine in the designer, but as soon as I hit F5 - the shell is shown on the surface - but none of the ScatterViews show up. Here's my xaml code so far. Am I missing something?? <s:SurfaceWindow x:Class="SurfaceUITreeDemo.TreeDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="http://schemas.microsoft.com/surface/2008" Title="WYITT Tree Demo" AllowsTransparency="False" Background="Beige"> <s:SurfaceWindow.Resources> <ImageBrush x:Key="WindowBackground" Stretch="None" Opacity="0.6" ImageSource="pack://application:,,,/Resources/TreeDemoBackground.jpg"/> </s:SurfaceWindow.Resources> <Grid Background="{StaticResource WindowBackground}" > <s:ScatterView Name="test"> <Image Source="C:\dev\Network-Alt-icon.png"/> </s:ScatterView> <s:ScatterView Height="100" Margin="456,160,348,0" Name="scatterView1" VerticalAlignment="Top" Background="Black"> <s:ScatterViewItem Height="100" Width="150"> <Image Source="C:\dev\Network-Alt-icon.png"/> </s:ScatterViewItem> <s:ScatterViewItem></s:ScatterViewItem> ScatterView </s:ScatterView> </Grid> </s:SurfaceWindow>

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• Multiline for WPF TextBox

  - by baron

  I am developing a app for sending some feedback. Basically i'm trying to make a TextBox for comments, but i'm used to the WinForms MultiLine=true. I've set MinLines to 3, which is getting there, but preferably i'd like if user is able to type wherever in this block, like press enter and do dot points sort of thing - like: - Item 1 blah - Item 2 blahlb lahbvl d But at the moment the text all stays on one line. - Item 1 blah - Item 2 blahb blahb blah This comments will then help fill the body of an email which is sent. It may be pointless if I can't easily keep the same formatting when putting this string into the email body string (so that it looks like it does when sent as it does when typed). Can I achieve what I'm after or do I have to leave it as all text on one line?

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• xerces serialization in Java 6

  - by Jim Garrison

  In Java 6, the entire xerces XML parser/serializer implementation is now in the Java runtime (rt.jar). The packages have been moved under the com.sun.* namespace, which places them off-limits for explicit reference within client code. This is not a problem when using the parser, which is instantiated via javax API-defined factories. However, our code also uses xerces serialization (org.apache.xml.serialize.* ). AFAICT, there are no javax.xml API-defined factories for creating instances of Serializer and OutputFormat. This seems to imply that the only way to get one is to explicitly call the com.sun.org.apache.xml.serialize.* APIs. I've found the serialization classes in javax.xml.stream, but they don't seem to provide any output-formatting control like the xerces OutputFormat class. Question: Is there a way to access the xerces serialization functionality (which is in rt.jar) via a javax standard API, without including xerces.jar and also without explicitly instantiating com.sun.* classes? If not, is there an javax API-compliant way to achieve the same effect?

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• .NET Excel Interop - Why aren't my Footers displaying in my printed output file?

  - by Ryan

  I'm working with C# and Office 2007's Excel Interop API. I'm opening an Excel file, applying some formatting and then sending it to the printer. I've got a problem, though. The Footer text doesn't appear to be printing. If I check the PageSetup.RightFooter property, I can see the expected Page Number in the Footer. That Page Number doesn't appear anywhere on the printed output sheet. When I print using Excel, though, they appear. Does anyone know why my Footer text is not appearing? Here's my code. Pastebin of my C# code

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• svnsync loses revision properties although hook installed

  - by roesslerj

  Hello all! I have a pretty weird problem. We have setup an SVN-Mirror via cronjob (because it needs to go from inside to outside of a firewall, so no post-commit-hook possible) and svnsync. We installed a pre-revprop-hook just as told. Everything seems to work fine, except that it doesn't. E.g. when manually executing the script. # svnsync --non-interactive sync file://<path-to-mirror> --source-username <usr> --source-password <pwd> Committed revision 19817. Copied properties for revision 19817. No error, no complaints. But if checking for the revision properties it says: # svnlook info <path-to-mirror> 0 # svn info -r HEAD file://<path-to-mirror> 2>&1 Path: <root-of-mirror> URL: file://<path-to-mirror> Repository Root: file://<path-to-mirror> Repository UUID: <uid> Revision: 19817 Node Kind: directory Last Changed Rev: 19817 So somehow the author and timestamp information gets lost. But we need that information for our internal processes. Since no error or warning is produced I have absolutely no idea even where to start to look. Everything is local (except for the remote master), so there are no server-logs to look at. I also tried to manually recopy via svnsync copy-revprops (http://chestofbooks.com/computers/revision-control/subversion-svn/svnsync-Copy-revprops-Ref-svnsync-C-Copy-revprops.html). It says Copied properties for revision 19885. But when I query them, it's just the same. Any ideas how I could approach that problem, or even better -- how to solve it? Any ideas appreciated.

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• Ignoring build number when referencing dll

  - by brickner

  I have one solution with a .NET 4.0 project (C#) that produces a delayed signed dll, that I dotfuscate and sign. EDIT: This is how I version the dll: [assembly: AssemblyVersion("0.7.0.*")] [assembly: AssemblyFileVersion("0.7.0.0")] I have another solution with a .NET 4.0 project (C++/CLI) that references the signed dll and produces a signed dll (actually, delayed signed and signed in a post build because of a flaw in the C++ build system). The problem is that the reference to the dll contains a specific version number, which includes even the build number (I want to have a build number). Every time I build the referenced dll, I have to change the project settings file (.vcxproj) so it reference the new version dll. Since I work with source control, this is very inconvenient (different computers might have different build numbers since each computer build its own referenced dll - the referenced dll is not in the source control). If I don't change the reference, I get a warning: warning MSB3245: Could not resolve this reference. Could not locate the assembly... And many errors like this: error C3083: 'Foo': the symbol to the left of a '::' must be a type These are resolved once I change the reference. How do I make the reference ignore the build number or even the entire version number?

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• Raw types and subtyping

  - by Dmitrii

  We have generic class SomeClass<T>{ } We can write the line: SomeClass s= new SomeClass<String>(); It's ok, because raw type is supertype for generic type. But SomeClass<String> s= new SomeClass(); is correct to. Why is it correct? I thought that type erasure was before type checking, but it's wrong. From Hacker's Guide to Javac When the Java compiler is invoked with default compile policy it performs the following passes: parse: Reads a set of *.java source files and maps the resulting token sequence into AST-Nodes. enter: Enters symbols for the definitions into the symbol table. process annotations: If Requested, processes annotations found in the specified compilation units. attribute: Attributes the Syntax trees. This step includes name resolution, type checking and constant folding. flow: Performs data ow analysis on the trees from the previous step. This includes checks for assignments and reachability. desugar: Rewrites the AST and translates away some syntactic sugar. generate: Generates Source Files or Class Files. Generic is syntax sugar, hence type erasure invoked at 6 pass, after type checking, which invoked at 4 pass. I'm confused.

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• Is there a good digraph layout library callable from C++?

  - by Steve314

  The digraphs represent finite automata. Up until now my test program has been writing out dot files for testing. This is pretty good both for regression testing (keep the verified output files in subversion, ask it if there has been a change) and for visualisation. However, there are some problems... Basically, I want something callable from C++ and which plans a layout for my states and transitions but leaves the drawing to me - something that will allow me to draw things however I want and draw on GUI (wxWidgets) windows. I also want a license which will allow commercial use - I don't need that at present, and I may very well release as open source, but I don't want to limit my options ATM. The problems with GraphViz are (1) the warnings about building from source on Windows, (2) all the unnecessary dependencies for rendering and parsing, and (3) the (presumed) lack of a documented API specifically and purely for layout. Basically, I want to be able to specify my states (with bounding rectangle sizes) and transitions, and read out positions for the states and waypoints for each transition, then draw based on those co-ordinates myself. I haven't really figured out how annotations on transitions should be handled, but there should be some kind of provision for specifying bounding-box-sizes for those, associating them with transitions, and reading out positions. Does anyone know of a library that can handle those requirements? I'm not necessarily against implementing something for myself, but in this case I'd rather avoid it if possible.

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• A question about DOM parser used with Python

  - by fixxxer

  I'm using the following python code to search for a node in an XML file and changing the value of an attribute of one of it's children.Changes are happening correctly when the node is displayed using toxml().But, when it is written to a file, the attributes rearrange themselves(as seen in the Source and the Final XML below). Could anyone explain how and why this happen? Python code: #!/usr/bin/env python import xml from xml.dom.minidom import parse dom=parse("max.xml") #print "Please enter the store name:" for sku in dom.getElementsByTagName("node"): if sku.getAttribute("name") == "store": sku.childNodes[1].childNodes[5].setAttribute("value","Delhi,India") print sku.toxml() xml.dom.ext.PrettyPrint(dom, open("new.xml", "w")) a part of the Source XML: <node name='store' node_id='515' module='mpx.lib.node.simple_value.SimpleValue' config_builder='' inherant='false' description='Configurable Value'> <match> <property name='1' value='point'/> <property name='2' value='0'/> <property name='val' value='Store# 09204 Staten Island, NY'/> <property name='3' value='str'/> </match> </node> Final XML : <node config_builder="" description="Configurable Value" inherant="false" module="mpx.lib.node.simple_value.SimpleValue" name="store" node_id="515"> <match> <property name="1" value="point"/> <property name="2" value="0"/> <property name="val" value="Delhi,India"/> <property name="3" value="str"/> </match> </node>

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• wpf dispatcher/threading issue

  - by phm

  Hello I have a problem in my code and I am not able to fix it at all. private static void SetupImages(object o) { int i = (int)o; BitmapImage bi = GetBitmapObject(i); img = new System.Windows.Controls.Image();//declared as static outside img.Source = bi;//crash here img.Stretch = Stretch.Uniform; img.Margin = new Thickness(5, 5, 5, 5); } which is called like this: for (int i = 0; i < parameters.ListBitmaps.Count; i++) { ParameterizedThreadStart ts = new ParameterizedThreadStart(SetupImages); Thread t = new Thread(ts); t.SetApartmentState(ApartmentState.STA); t.Start(i); t.Join(); //SetupImages(i); parameters.ListImageControls.Add(img); } It always crashes on this line: img.Source = bi; The error is: "An unhandled exception of type 'System.InvalidOperationException' occurred in WindowsBase.dll Additional information: The calling thread cannot access this object because a different thread owns it." Thanks

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• Legitimate uses of the Function constructor

  - by Marcel Korpel

  As repeatedly said, it is considered bad practice to use the Function constructor (also see the ECMAScript Language Specification, 5th edition, § 15.3.2.1): new Function ([arg1[, arg2[, … argN]],] functionBody) (where all arguments are strings containing argument names and the last (or only) string contains the function body). To recapitulate, it is said to be slow, as explained by the Opera team: Each time […] the Function constructor is called on a string representing source code, the script engine must start the machinery that converts the source code to executable code. This is usually expensive for performance – easily a hundred times more expensive than a simple function call, for example. (Mark ‘Tarquin’ Wilton-Jones) Though it's not that bad, according to this post on MDC (I didn't test this myself using the current version of Firefox, though). Crockford adds that [t]he quoting conventions of the language make it very difficult to correctly express a function body as a string. In the string form, early error checking cannot be done. […] And it is wasteful of memory because each function requires its own independent implementation. Another difference is that a function defined by a Function constructor does not inherit any scope other than the global scope (which all functions inherit). (MDC) Apart from this, you have to be attentive to avoid injection of malicious code, when you create a new Function using dynamic contents. Lots of disadvantages and it is intelligible that ECMAScript 5 discourages the use of the Function constructor by throwing an exception when using it in strict mode (§ 13.1). That said, T.J. Crowder says in an answer that [t]here's almost never any need for the similar […] new Function(...), either, again except for some advanced edge cases. So, now I am wondering: what are these “advanced edge cases”? Are there legitimate uses of the Function constructor?

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