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• Mac OS - Built SVN from source, now Apache2 not loading sites

  - by Geuis

  This relates to another question I asked earlier today. I built SVN 1.6.2 from source. In the process, it has completely screwed up my dev environment. After I built SVN, Apache wasn't loading. It was giving me this error: Syntax error on line 117 of /private/etc/apache2/httpd.conf: Cannot load /usr/libexec /apache2/mod_dav_svn.so into server: dlopen(/usr/libexec/apache2/mod_dav_svn.so, 10): no suitable image found. Did find:\n\t/usr/libexec/apache2/mod_dav_svn.so: mach-o, but wrong architecture It appears that SVN over-wrote the old mod_dav_svn.so and I am not able to get it to build as FAT, and I can't recover whatever was originally there. I resolved this(temporarily?) by commenting out the line that was loading the mod_dav_svn.so and got Apache to start at this point. However, even though Apache is running I am now getting this error when trying to access my dev sites: Directory index forbidden by Options directive: /usr/share/tomcat6/webapps/ROOT/ I have Apache2 sitting in front of Tomcat6. I access my local dev site using the internal name "http://localthesite". I have had virtual directories set up that have worked until this SVN debacle. Tomcat is installed at /usr/local/apache-tomcat, and webapps is /usr/local/apache-tomcat/webapps. Our production servers deploy tomcat to /usr/share/tomcat6, so I have symlinks setup on my system to replicate this as well. These point back to the actual installation path. This has all been working fine as well. None of our configurations for Apache2, Tomcat, or .htaccess have changed. Over the weekend, I performed a "Repair Disk Permissions" on the system. This was before I discovered the mod_dav_svn.so problem. I have been reading up on this all morning and the most common answer is that there is an Options -Indexes set. We have this in a config file, but it was there before and when I removed it during testing, I still got the same errors from Apache. At this point, I'm assuming I either totally borked the native Apache2 installation on this Mac, or that there is a permissions error somewhere that I'm missing. The permissions error could be from the SVN installation, or from my repair process. Does anyone have any idea what could be the problem? I'm totally blocked right now and have no idea where to check next.

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• XSLT generating attributes if source-Element is in parameterfile

  - by Siegfried

  Hi, i got an xml-file with some elements. For some of these is an aqvivalent in a parameter xml-file along with some other elements. I want to add these other elements from parm-file as parameter to output file if element-names are matching. (the Attributes should only be generated if an element "InvoiceHeader" exists in the source-xml. Here is my code... <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions"> <xsl:variable name="rpl" select="document('ParamInvoice.xml')"></xsl:variable> <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/> <xsl:template match="/"> <xsl:apply-templates></xsl:apply-templates> </xsl:template> <xsl:template match="*"> <xsl:copy> <xsl:if test="$rpl/StoraInvoice/local-name()"> <xsl:call-template name="AttributeErzeugen"> <xsl:with-param name="attr" select="$rpl/StoraInvoice/local-name()"></xsl:with-param> </xsl:call-template> </xsl:if> <xsl:apply-templates></xsl:apply-templates> </xsl:copy> </xsl:template> <xsl:template name="AttributeErzeugen"> <xsl:param name="attr"></xsl:param> <xsl:for-each select="$attr"> <xsl:attribute name="{Attibute/@name}"><xsl:value-of select="."></xsl:value- of></xsl:attribute> </xsl:for-each> </xsl:template> </xsl:stylesheet> and here the param-file <?xml version="1.0" encoding="UTF-8"?> <StoraInvoice> <InvoiceHeader> <Attribute name="Fuehrend">YYY</Attribute> <Attribute name="Feld">FFFF</Attribute> <Attribute name="Format">XYZXYZ</Attribute> </InvoiceHeader> </StoraInvoice> Siegfried

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• Script to dynamically change the source of an iframe tag

  - by Ukavi

  I want a code that will dynamically change the source of an iframe tag when a hyperlink is clicked for example I have one master page that should load content from other web pages using the iframe tag when a hyperlink is clicked but I don't know how to do it. Here is my code <html> <head> <title> </title> <style type="text/css"> #content{ margin-right:30%; margin-bottom: 10px; padding: 10px; border: 1px solid #000; margin-left:17%; background-repeat:no-repeat; width:686; height:640; } </style> <script type="text/javascript"> function hyperlinkChanger(hyperLink) { switch (hyperLink) { case "home": var url="home.html"; return url; break; case "about_Us": var url="about_us.html"; return url; break; case "contact_Us: var url="contact_us.html"; return url; break; } } </script> </head> <body> <a href="home.html" name="home" onClick="hyperlinkChanger('home')">Home</a> <br /> <a href="about_us.html" name="about_Us" onClick="hyperlinkChanger('about_Us')">About Us</a> <br /> <a href="contact_us.html" name="contact_Us" onClick="hyperlinkChanger('contact_Us')">Contact us</a> <br /> <div name="content"> <!--please help me write a method to call the output of the funcion hyperlinkChanger--> <iframe src="hyprlink function" width="600" height="300"> </iframe> </div> </body> </html>

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• Bound DataGridView not updating data source

  - by Max Yaffe

  I'm trying to bind a table of structures to a DataGridView. Loading and viewing the table is working fine but I can't edit a value and get it stored back into the table. Here's what I'm doing. I have a "primitive" data type, Real defined by public struct MyReal:IMyPrimative { public Double m_Real; //... public MyReal(String val) { m_Real = default(Double); Init(val); } //... } It gets used in a structure: public struct MyReal_Record : IMyRecord { public MyReal Freq { get; set;} MyReal_Record(String[] vals) { Init(vals); } } And the structure is used to define a table using a generic Binding List public class MyTable<S> : BindingList<S> where S: struct, IMyRecord { public Type typeofS; public MyTable() { typeofS = typeof(S); // ... } This table is used as a binding source for a grid, dynamically. private void miLoadFile_Click(object sender, EventArgs e) { MyModel.Table<Real_Record> RTable = new MyModel.Table<Real_Record>(); //... Table initialized here //set up grid with virtual mode dataGridView1.DataSource = RTable; } All of this works fine and I can create RTable, initialize it and display it in a grid. The grid allows editing and has events set for CellParsing and CellFormatting which look like: private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e) { if (e.DesiredType != typeof(String)) return; e.Value = e.Value.ToString(); } private void dataGridView1_CellParsing(object sender, DataGridViewCellParsingEventArgs e) { if (e.DesiredType != typeof(MyReal)) return; e.Value = new MyReal(e.Value.ToString()); e.ParsingApplied = true; this.dataGridView1.UpdateCellValue(e.ColumnIndex, e.RowIndex); } When I edit a value in a cell, I can change the text. On leaving the cell, CellParsing fires and the event handler is called. Everything seems to be correct going into the CellParsing handler. e.DesiredType is MyReal. e.Value is a string with the new value. After the new MyReal is created from the string, e.Value is set correctly. RowIndex and ColumnIndex are correct. ReadOnly is set false. However, when I leave the cell, the system restores the original value to the cell. I thought the UpdateCellValue would replace the value in the dataSource but I seem to be missing something. What did I miss? Thanks, Max

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• Converting C source to C++

  - by Barry Kelly

  How would you go about converting a reasonably large (300K), fairly mature C codebase to C++? The kind of C I have in mind is split into files roughly corresponding to modules (i.e. less granular than a typical OO class-based decomposition), using internal linkage in lieu private functions and data, and external linkage for public functions and data. Global variables are used extensively for communication between the modules. There is a very extensive integration test suite available, but no unit (i.e. module) level tests. I have in mind a general strategy: Compile everything in C++'s C subset and get that working. Convert modules into huge classes, so that all the cross-references are scoped by a class name, but leaving all functions and data as static members, and get that working. Convert huge classes into instances with appropriate constructors and initialized cross-references; replace static member accesses with indirect accesses as appropriate; and get that working. Now, approach the project as an ill-factored OO application, and write unit tests where dependencies are tractable, and decompose into separate classes where they are not; the goal here would be to move from one working program to another at each transformation. Obviously, this would be quite a bit of work. Are there any case studies / war stories out there on this kind of translation? Alternative strategies? Other useful advice? Note 1: the program is a compiler, and probably millions of other programs rely on its behaviour not changing, so wholesale rewriting is pretty much not an option. Note 2: the source is nearly 20 years old, and has perhaps 30% code churn (lines modified + added / previous total lines) per year. It is heavily maintained and extended, in other words. Thus, one of the goals would be to increase mantainability. [For the sake of the question, assume that translation into C++ is mandatory, and that leaving it in C is not an option. The point of adding this condition is to weed out the "leave it in C" answers.]

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• ASP.NET Elements are null when assigning data source

  - by deccks

  For some reason, all of the objects in my ASP.NET markup are now null when I try to assign values to their properties in the code behind. My project was going fine and then now when I try to assign a data source to a GridView, I get a null reference error. I have no idea why it's doing this. I am not doing nothing special. I am just trying to assign a value to a property to an asp.net element in on the page. The intellisense knows that the element is there and I get no errors when I build the project. It's just when I am running the website I get the null reference. I have been trying to fix this issue for a couple weeks now. Please Help. Thanks. Here is the code: protected void Page_PreRender(object sender, EventArgs e) { LoadData(); } private void LoadData() { Entities context = new Entities(); var types = (from t in context.CustomerTypes select t).OrderBy(t => t.TypeName); gvCustomerTypes.DataSource = types; gvCustomerTypes.DataBind(); } and on in the markup the gridview looks like this: <asp:GridView ID="gvCustomerTypes" runat="server" ShowHeader="true" GridLines="Both" AutoGenerateColumns="false" AlternatingRowStyle-BackColor="AliceBlue" Width="100%"> <Columns> <asp:TemplateField HeaderText="Customer Type Name" HeaderStyle-HorizontalAlign="Left" ItemStyle-HorizontalAlign="Left"> <ItemTemplate> <asp:Label ID="lblType" runat="server" Text='<%# Eval("TypeName") %>' /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Edit" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center"> <ItemTemplate> <asp:HyperLink ID="HyperLink1" NavigateUrl='<%#Eval("CustomerTypeID", "CreateEditCustomerType.aspx?ID={0}") %>' Text="Edit" runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Delete" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center"> <ItemTemplate> <asp:LinkButton ID="LinkButton1" CommandName='<%#Eval("CustomerTypeID") %>' OnClientClick="javascript:return confirm('Are you sure you want to delete this Customer Type?');" OnCommand="DeleteCustomerType" Text="Delete" runat="server" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView>

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• Make sense of Notification Watcher source objective-c

  - by Chris

  From Notification Watcher source. - (void)selectNotification:(NSNotification*)aNotification { id sender = [aNotification object]; [selectedDistNotification release]; selectedDistNotification = nil; [selectedWSNotification release]; selectedWSNotification = nil; NSNotification **targetVar; NSArray **targetList; if (sender == distNotificationList) { targetVar = &selectedDistNotification; targetList = &distNotifications; } else { targetVar = &selectedWSNotification; targetList = &wsNotifications; } if ([sender selectedRow] != -1) { [*targetVar autorelease]; *targetVar = [[*targetList objectAtIndex:[sender selectedRow]] retain]; } if (*targetVar == nil) { [objectText setStringValue:@""]; } else { id obj = [*targetVar object]; NSMutableAttributedString *objStr = nil; if (obj == nil) { NSFont *aFont = [objectText font]; NSDictionary *attrDict = italicAttributesForFont(aFont); objStr = [[NSMutableAttributedString alloc] initWithString:@"(null)" attributes:attrDict]; } else { /* Line 1 */ objStr = [[NSMutableAttributedString alloc] initWithString: [NSString stringWithFormat:@" (%@)", [obj className]]]; [objStr addAttributes:italicAttributesForFont([objectText font]) range:NSMakeRange(1,[[obj className] length]+2)]; if ([obj isKindOfClass:[NSString class]]) { [objStr replaceCharactersInRange:NSMakeRange(0,0) withString:obj]; } else if ([obj respondsToSelector:@selector(stringValue)]) { [objStr replaceCharactersInRange:NSMakeRange(0,0) withString:[obj performSelector:@selector(stringValue)]]; } else { // Remove the space since we have no value to display [objStr replaceCharactersInRange:NSMakeRange(0,1) withString:@""]; } } [objectText setObjectValue:objStr]; /* LINE 2 */ [objStr release]; } [userInfoList reloadData]; } Over at //LINE 2 objStr is being released. Is this because we are assigning it with alloc in //LINE 1? Also, why is //LINE 1 not: objStr = [NSMutableAttributedString* initWithString:@"(null)" attributes:attrDict] If I create a new string like (NSString*) str = [NSString initWithString:@"test"]; ... str = @"another string"; Would I have to release str, or is this wrong and if I do that I have to use [[NSString alloc] initWithString:@"test"]? Why isn't the pointer symbol used as in [[NSString* alloc] ...? Thanks

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• WPF: Can't get to original source from ExecutedRoutedEventArgs

  - by Ikhail

  I have a problem getting to the original source of a command using ExecutedRoutedEventArgs. I'm creating a simple splitbutton, in which a menu will appear below a dedicated button, as another button is pressed. When I click a menuitem in the appearing menu a command is fired. This command is registered on the splitbutton. And the idea is to get to the menuitem beeing clicked, by using the ExecutedRoutedEventsArgs. Ok, now the problem. If I choose to have the popup menu shown by default (IsOpen="True") and I click one of the menuitems I can get to the originalsource (thus the menuitem) from the ExecutedRoutedEventArgs - no problem. However, if I first click the button to show the menu and THEN click on a menuitem, the originalsource of the command will be the button instead of the MenuItem! Here's the controltemplate for the splitbutton: <ControlTemplate TargetType="{x:Type usc:SplitButton}"> <StackPanel Orientation="Horizontal"> <Button Name="mybutton"> <StackPanel> <Popup usc:SplitButton.IsPopup="True" IsOpen="True" Name="myPopup" PlacementTarget="{Binding ElementName=mybutton}" StaysOpen="False" Placement="Bottom"> <Border BorderBrush="Beige" BorderThickness="1"> <Menu Width="120"> <MenuItem Header="item1" Command="usc:SplitButton.MenuItemClickCommand" /> <MenuItem Header="item2" /> <MenuItem Header="item3" /> </Menu> </Border> </Popup> <TextBlock Text="MySplitbutton" /> </StackPanel> </Button> <Button Content="OK" Command="usc:SplitButton.ShowMenuCommand" /> </StackPanel> </ControlTemplate> The OK button fires a ShowMenuCommand on the SplitButton, which sets the IsOpen property on the Popup to True. Any ideas why the OK button (after having activated the menu) is the OriginalSource when a menuitem is clicked? Thanks.

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• Should maven generate jaxb java code or just use java code from source control?

  - by Peter Turner

  We're trying to plan how to mash together a build server for our shiny new java backend. We use a lot of jaxb XSD code generation and I was getting into a heated argument with whoever cared that the build server should delete jaxb created structures that were checked in generate the code from XSD's use code generated from those XSD's Everyone else thought that it made more sense to just use the code they checked in (we check in the code generated from the XSD because Eclipse pretty much forces you to do this as far as I can tell). My only stale argument is in my reading of the Joel test is that making the build in one step means generating from the source code and the source code is not the java source, but the XSD's because if you're messing around with the generated code you're gonna get pinched eventually. So, given that we all agree (you may not agree) we should probably be checking in our generate java files, should we use them to generate our code or should we generate it using the XSD's?

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• Is there a difference between "." and "source" in bash, after all?

  - by ysap

  I was looking for the difference between the "." and "source" builtin commands and a few sources (e.g., in this discussion, and the bash manpage) suggest that these are just the same. However, following a problem with environment variables, I conducted a test. I created a file testenv.sh that contains: #!/bin/bash echo $MY_VAR In the command prompt, I performed the following: > chmod +x testenv.sh > MY_VAR=12345 > ./testenv.sh > source testenv.sh 12345 > MY_VAR=12345 ./testenv.sh 12345 [note that the 1st form returned an empty string] So, this little experiment suggests that there is a difference after all, where for the "source" command, the child environment inherits all the variables from the parent one, where for the "." it does not. Am I missing something, or is this is an undocumented/deprecated feature of bash? [ GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu) ]

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• Creuna Platform

  - by csharp-source.net

  Creuna Platform is a an open source web application framework based on Microsoft .NET and is fully written in C#. The aim for Creuna Platform is to make life easier for system developers by providing a highly competent component toolkit that increases the productivity and quality of a system. The framework contains components for data access, configuration handling, messaging and a broad range of utility classes, controls and services. The framework also has several components for the EPiServer CMS. Creuna Platform is licensed under Affero GNU General Public License Version 3.

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• La fondation Mozilla met à jour la licence open-source MPL, la nouvelle version serait compatible avec les licences Apache et GPL

  La fondation Mozilla met à jour sa licence open-source MPL La nouvelle version serait compatible avec les licences Apache et GPL La fondation Mozilla vient de publier pour la première fois depuis plus d'une décennie une mise à jour de sa licence open source Mozilla Public License. Actuellement disponible en version bêta « feature complete », la licence MPL 2.0 serait plus simple et plus courte de près de 900 mots que la version 1.1. Elle serait surtout conçue pour être plus compatible avec d'autres licence open-source, notamment les licences Apache et GPL. Pour mémoire, le code ouvert distribué sous licence MPL peut être copié et modifié, mais doit rester sou...

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• Habanero

  - by csharp-source.net

  An Enterprise Application Framework for .Net that is ideally suited for developing applications in an agile manner. The framework is used for producing an application from the data layer through to the front-end. Free open source under the LGPL license, it includes ORM, code generation and runtime UI generation to create one application for the desktop & web. Features: * ORM: Map database tables to objects in code * Persist property values to and from the database * Define all mapping in a single XML file * Switch between database vendors with one setting * Support for MySQL, MS Sql Server, MS Access, Oracle, PostgreSQL, SQLite, Firebird * FireStarter GUI class definitions xml manager * Generate user interfaces and map properties to controls * Develop for both desktop (with Windows Forms) and web (with Gizmox' Visual WebGUI) * Generate new projects and code files * Generate UI forms from templates * Reverse engineer class definitions from existing databases * Support variable data sources, including an in-memory database. Ships with Firestarter a free database reverse engineering, Domain Modelling and Code Generator.

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• ASP.NET MVC, Web API, Razor : Microsoft prendra en compte les contributions externes pour ces produits open source

  ASP.NET MVC, Web API, Razor : Microsoft prendra en compte les contributions externes pour ces produits open source Microsoft vient d'annoncer qu'il allait publier sous licence open source Apache 2.0 le code source de Web Pages et ASP.NET Web API. Web Pages est la plateforme sur laquelle repose le nouveau moteur de vue Razor, la première version avait été publiée avec WebMatrix 1 et ASP.NET MVC 3. Web Pages est actuellement disponible en version 2 beta. ASP.NET Web API, quant à elle, permet aux développeurs d'exposer leurs applications, données et services sur le web directement à travers HTTP. La technologie avait été introduite avec ASP.NET MVC 4 beta. Le passage à l'op...

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• Microsoft rend Reactive Extensions open-source, son Framework qui facilite la programmation asynchrone en .NET, C++ et JS

  Reactive Extensions devient open source Microsoft publie le code du Framework qui rend simple la programmation asynchrone en .NET, JavaScript et C++ Le virage vers l'open source adopté par Microsoft pour plusieurs de ses outils de développement continu (voir sur le même sujet). La firme vient d'annoncer le passage des Reactive Extensions (Rx) à Microsoft Open Technology, sa filiale en charge des projets open source. Reactive Extensions est un projet du laboratoire Devlabs de Microsoft, qui a connu une certaine notoriété, car il a été développé par l'équipe d'Erik Meijer, le créateur de LINQ. Rx est un ensemble de bibliothèques qui rend la programmation asynchrone be...

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• Opus : le nouveau codec audio open-source est standardisé, il ferait mieux que six codecs propriétaires réunis dixit Mozilla

  Opus : le nouveau codec audio open-source est standardisé Il couvre les usages de six codecs propriétaires et le ferait mieux dixit Mozilla Une victoire historique. Pour Mozilla, la standardisation du codec audio open-source Opus est un évènement de cette envergure. La Fondation y voit « le début de la fin des formats propriétaires [dans l'audio] ». Ce projet de standardisation a été mené à bien grâce à une collaboration entre le monde open-source (dont est issue la Fondation) et des entreprises privées dont Microsoft (au travers de Skype) ou Google. Cette standardisation devrait permettre à Opus de mieux s'imposer que ses prédécesseurs (comme Vorbis)...

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• Folly : la bibliothèque C++ open-source de Facebook, une initiative pour partager les outils utilisés en interne

  Folly : la bibliothèque C++ open-source de Facebook Une initiative pour partager les outils utilisés en interne Herb Sutter, l'expert reconnu du langage C++, encense dans son dernier billet de blog l'initiative de Facebook qui vient tout juste de publier en open-source sa bibliothèque d'utilités : Folly. Cette bibliothèque contient tout un tas d'algorithmes et de structures utilisés dans le code de Facebook. L'essentiel des fonctionnalités couvre les problèmes de performances ou d'absence d'implémentations trouvés dans les bibliothèques déjà existantes comme Boost ou la bibliothèque standard. De plus en plus d'entreprises mettent leur code source à disposition de tous et permettent...

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• Why don't we store the syntax tree instead of the source code?

  - by Calmarius

  We have a lot of programming languages. Every language is parsed and syntax checked before translated into code so an abstract syntax tree is built. We have this abstract syntax tree, why don't we store this syntax tree instead of the source code (or next to the source code)? By using an AST instead of the source code. Every programmer in a team can serialize this tree to any language, they want (with the appropriate context free grammar) and parse back to AST when they finished. So this would eliminate the debate about the coding style questions (where to put the { and }, where to put whitespace, indentation, etc.) What are the pros and cons of this approach?

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• Proper way to cleanup dynamic engines and can they be loaded twice?

  - by Becky

  Hello - I am having problems loading Engine PKCS #11 as a dynamic engine using python and M2Crypto. I am trying to access an Aladdin USB eToken. Here are the important steps from my python code: dynamic = Engine.load_dynamic_engine("pkcs11", "/usr/local/ssl/lib/engines/engine_pkcs11.so") pkcs11 = Engine.Engine("pkcs11") pkcs11.ctrl_cmd_string("MODULE_PATH", "/usr/lib/libeTPkcs11.so") pkcs11.engine_init_custom() # initialize engine with custom M2Crypto patch # next few steps which I deleted pass password and grab key & cert off token Engine.cleanup() This works fine the first time this method gets run. The second time, it fails when loading the dynamic engine (see error below). Traceback (most recent call last): File "", line 1, in ? File "/usr/local/lib/python2.4/site-packages/M2Crypto/Engine.py", line 98, in load_dynamic_engine e.ctrl_cmd_string("LOAD", None) File "/usr/local/lib/python2.4/site-packages/M2Crypto/Engine.py", line 38, in ctrl_cmd_string raise EngineError(Err.get_error()) M2Crypto.Engine.EngineError: 4002:error:260B606D:engine routines:DYNAMIC_LOAD:init failed:eng_dyn.c:521: Is it impossible to load engines twice in a python session? Am I missing some kind of engine cleanup/deletion? The OpenSSL docs talk about engine_finish() but I don't think M2Crypto offers that. Is there a method to tell if the engine is already loaded? Thanks!

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• Problem creating calculations 'engine' in two class java calculator

  - by tokee

  i have hit a brick wall whilst attempting to create a two class java calculator but have been unsuccessful so far in getting it working. i have the code for an interface which works and displays ok but creating a seperate class 'CalcEngine' to do the actual calculations has proven to be beyond me. I'd appreciate it if someone could kick start things for me and create a class calcEngine which works with the interface class and allows input when from single button i.e. if one is pressed on the calc then 1 displays onscreen. please note i'm not asking someone to do the whole thing for me as i want to learn and i'm confident i can do the rest including addition subtraction etc. once i get over the obstacle of getting the two classes to communicate. any and all assistance would be very much appreciated. Please see the calcInterface class code below - import java.awt.*; import javax.swing.*; import javax.swing.border.*; import java.awt.event.*; /** *A Class that operates as the framework for a calculator. *No calculations are performed in this section */ public class CalcFrame implements ActionListener { private CalcEngine calc; private JFrame frame; private JTextField display; private JLabel status; /** * Constructor for objects of class GridLayoutExample */ public CalcFrame() { makeFrame(); //calc = engine; } /** * This allows you to quit the calculator. */ // Alows the class to quit. private void quit() { System.exit(0); } // Calls the dialog frame with the information about the project. private void showAbout() { JOptionPane.showMessageDialog(frame, "Group Project", "About Calculator Group Project", JOptionPane.INFORMATION_MESSAGE); } private void makeFrame() { frame = new JFrame("Group Project Calculator"); makeMenuBar(frame); JPanel contentPane = (JPanel)frame.getContentPane(); contentPane.setLayout(new BorderLayout(8, 8)); contentPane.setBorder(new EmptyBorder( 10, 10, 10, 10)); /** * Insert a text field */ display = new JTextField(); contentPane.add(display, BorderLayout.NORTH); //Container contentPane = frame.getContentPane(); contentPane.setLayout(new GridLayout(4, 4)); JPanel buttonPanel = new JPanel(new GridLayout(4, 4)); contentPane.add(new JButton("1")); contentPane.add(new JButton("2")); contentPane.add(new JButton("3")); contentPane.add(new JButton("4")); contentPane.add(new JButton("5")); contentPane.add(new JButton("6")); contentPane.add(new JButton("7")); contentPane.add(new JButton("8")); contentPane.add(new JButton("9")); contentPane.add(new JButton("0")); contentPane.add(new JButton("+")); contentPane.add(new JButton("-")); contentPane.add(new JButton("/")); contentPane.add(new JButton("*")); contentPane.add(new JButton("=")); contentPane.add(new JButton("C")); contentPane.add(buttonPanel, BorderLayout.CENTER); //status = new JLabel(calc.getAuthor()); //contentPane.add(status, BorderLayout.SOUTH); frame.pack(); frame.setVisible(true); } /** * Create the main frame's menu bar. * The frame that the menu bar should be added to. */ private void makeMenuBar(JFrame frame) { final int SHORTCUT_MASK = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask(); JMenuBar menubar = new JMenuBar(); frame.setJMenuBar(menubar); JMenu menu; JMenuItem item; // create the File menu menu = new JMenu("File"); menubar.add(menu); // create the Quit menu with a shortcut "Q" key. item = new JMenuItem("Quit"); item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK)); item.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { quit(); } }); menu.add(item); // Adds an about menu. menu = new JMenu("About"); menubar.add(menu); // Displays item = new JMenuItem("Calculator Project"); item.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { showAbout(); } }); menu.add(item); } /** * An interface action has been performed. * Find out what it was and handle it. * @param event The event that has occured. */ public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); if(command.equals("0") || command.equals("1") || command.equals("2") || command.equals("3") || command.equals("4") || command.equals("5") || command.equals("6") || command.equals("7") || command.equals("8") || command.equals("9")) { int number = Integer.parseInt(command); calc.numberPressed(number); } else if(command.equals("+")) { calc.plus(); } else if(command.equals("-")) { calc.minus(); } else if(command.equals("=")) { calc.equals(); } else if(command.equals("C")) { calc.clear(); } else if(command.equals("?")) { } // else unknown command. redisplay(); } /** * Update the interface display to show the current value of the * calculator. */ private void redisplay() { display.setText("" + calc.getDisplayValue()); } /** * Toggle the info display in the calculator's status area between the * author and version information. */ }

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• Saving associated domain classes in Grails

  - by Cesar

  I'm struggling to get association right on Grails. Let's say I have two domain classes: class Engine { String name int numberOfCylinders = 4 static constraints = { name(blank:false, nullable:false) numberOfCylinders(range:4..8) } } class Car { int year String brand Engine engine = new Engine(name:"Default Engine") static constraints = { engine(nullable:false) brand(blank:false, nullable:false) year(nullable:false) } } The idea is that users can create cars without creating an engine first, and those cars get a default engine. In the CarController I have: def save = { def car = new Car(params) if(!car.hasErrors() && car.save()){ flash.message = "Car saved" redirect(action:index) }else{ render(view:'create', model:[car:car]) } } When trying to save, I get a null value exception on the Car.engine field, so obviously the default engine is not created and saved. I tried to manually create the engine: def save = { def car = new Car(params) car.engine = new Engine(name: "Default Engine") if(!car.hasErrors() && car.save()){ flash.message = "Car saved" redirect(action:index) }else{ render(view:'create', model:[car:car]) } } Didn't work either. Is Grails not able to save associated classes? How could I implement such feature?

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• Forms bound to updateable ADO recordsets are not updateable when the source includes a JOIN

  - by Art

  I'm developing an application in Access 2007. It uses an .accdb front end connecting to an SQL Server 2005 backend. I use forms that are bound to ADO recordsets at runtime. For the sake of efficiency, the recordsets usually contain only one record, and are queried out on the server: Public Sub SetUpFormRecordset(cn As ADODB.Connection, rstIn As ADODB.Recordset, rstSource As String) Dim cmd As ADODB.Command Dim I As Long Set cmd = New ADODB.Command cn.Errors.Clear ' Recordsets based on command object Execute method are Read Only! With cmd Set .ActiveConnection = cn .CommandType = adCmdText .CommandText = rstSource End With With rstIn .CursorType = adOpenKeyset .LockType = adLockPessimistic 'Check the locktype after opening; optimistic locking is worthless on a bound End With ' form, and ADO might open optimistically without firing an error! rstIn.Open cmd, , adOpenKeyset, adLockPessimistic 'This should run the query on the server and return an updatable recordset With cn If .Errors.Count <> 0 Then For Each errADO In .Errors Call HandleADOErrors(.Errors(I)) I = I + 1 Next errADO End If End With End Sub rstSource (the string containg the TSQL on which the recordset is based) is assembled by the calling routine, in this case from the Open event of the form being bound: Private Sub Form_Open(Cancel As Integer) Dim rst As ADODB.Recordset Dim strSource As String, DefaultSource as String Dim lngID As Long lngID = Forms!MyParent.CurrentID strSource = "SELECT TOP (100) PERCENT dbo.Customers.CustomerID, dbo.Customers.LegacyID, dbo.Customers.Active, dbo.Customers.TypeID, dbo.Customers.Category, " & _ "dbo.Customers.Source, dbo.Customers.CustomerName, dbo.Customers.CustAddrID, dbo.Customers.Email, dbo.Customers.TaxExempt, dbo.Customers.SalesTaxCode, " & _ "dbo.Customers.SalesTax2Code, dbo.Customers.CreditLimit, dbo.Customers.CreationDate, dbo.Customers.FirstOrder, dbo.Customers.LastOrder, " & _ "dbo.Customers.nOrders, dbo.Customers.Concurrency, dbo.Customers.LegacyLN, dbo.Addresses.AddrType, dbo.Addresses.AddrLine1, dbo.Addresses.AddrLine2, " & _ "dbo.Addresses.City, dbo.Addresses.State, dbo.Addresses.Country, dbo.Addresses.PostalCode, dbo.Addresses.PhoneLandline, dbo.Addresses.Concurrency " & _ "FROM dbo.Customers INNER JOIN " & _ "dbo.Addresses ON dbo.Customers.CustAddrID = dbo.Addresses.AddrID " strSource = strSource & "WHERE dbo.Customers.CustomerID= " & lngID With Me 'Default is Set up for editing one record If Not Nz(.RecordSource, vbNullString) = vbNullString Then If .Dirty Then .Dirty = False 'Save any changes on the form .RecordSource = vbNullString End If If rst Is Nothing Then 'Might not be first time through DefaultSource = .RecordSource Else rst.Close Set rst = Nothing End If End With Set rst = New ADODB.Recordset Call setupformrecordset(dbconn, rst, strSource) 'dbconn is a global variable With Me Set .Recordset = rst End With End Sub The recordset that is returned from setupformrecordset is fully updateable, and its .Supports property shows this. It can be edited and updated in code. The entire form, however, is read only, even though it's .AllowEdits and .AllowAdditions properties are both true. Even the fields from the right hand side (the 'many' side) cannot be edited. Removing the INNER JOIN clause from the TSQL (restricting strSource to one table) makes the form fully editable. I've verified that the TSQL includes priimary key fields from both tables, and each table includes a timestamp field for concurrency. I tried changing the .CursorType and .CursorLocation properties of the recordset to no avail. What am I doing wrong?

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• Hardware/Software inventory open source projects

  - by Dick dastardly

  Dear Stackoverflowers I would like to develop a Network Inventory application that works on any operating system. Reports on every possible resource attacehd to a network. Reports all pertinent details of hardware and software. Thats (and i hate to use the phrase) my "End Game". However I am running before i can crawl here. I have no experience of this type of development, e.g. discovering a computers hardware and software settings. I've spent almost two weeks googling and come up short! :-(. So I am turning to you to ask these questions:- My first step is to find an existing open source project i can incorporate into my own code that extracts the fine grained details i am after, e.g. EVERYTHING there is to know about the hardaware and software on a single machine. Does this project exist? or do i have to develop that first? Have i got to write all this in C? I am guessing getting this information about a computer is going to be easier than for printers, scanners, routers etc... e.g. everything else you would find attached to a network. Once i have access to a single computers details i then need to investigate how i can traverse an entire newtork of printers, scanners, routers, load balancers, switches, firewalls, workstations, servers, storeage devices, laptops, monitors, the list goes on and on One problem i have is i dont have a 1000 machine newtork to play on! Is there any such resource available on theinternet? (is that a silly question?) Anywho, if you dont ask you wont find out! One aspect iam really looking forward to finding out how to travers the entire network, should i be using TCP/IP for this? Whats a good site, blog, usergorup, book for TCP/IP development? How do i go about getting through firewalls? How many questions can i ask in one go? :-) My previous question on this topic ended up with PYTHON being championed as the language/script to go with to develop this application in. Having looked at a few PYTHON examples they all seemed to be related to WINDOWS networks and interrogating Windows Management Instrumentation (WMI). I had the feeling you cant rely on whats in WMI, and even if you can that s no good for UNIX netwrks. Surely there exist common code for extracting hardware and software details from a computer? Why cant i find it on the internet? Pease help? Theres no prizes though :-( Thanks in advance I would like to appologise if i have broken forum rules or not tried hard enough on my own before asking for assistance. I just would like to start moving forward with this as its one of the best projects i have been involved with. I am inspired by the many differnt number of challenges involved and that if i manage to produce a useful application at the end of it it would hopefully be extremely helpful to many people. That sit Thanks in advance DD

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• Same source, multiple targets with different resources (Visual Studio .Net 2008)

  - by Mike Bell

  A set of software products differ only by their resource strings, binary resources, and by the strings / graphics / product keys used by their Visual Studio Setup projects. What is the best way to create, organize, and maintain them? i.e. All the products essentially consist of the same core functionality customized by graphics, strings, and other resource data to form each product. Imagine you are creating a set of products like "Excel for Bankers", Excel for Gardeners", "Excel for CEOs", etc. Each product has the the same functionality, but differs in name, graphics, help files, included templates etc. The environment in which these are being built is: vanilla Windows.Forms / Visual Studio 2008 / C# / .Net. The ideal solution would be easy to maintain. e.g. If I introduce a new string / new resource projects I haven't added the resource to should fail at compile time, not run time. (And subsequent localization of the products should also be feasible). Hopefully I've missed the blindingly-obvious and easy way of doing all this. What is it? ============ Clarification(s) ================ By "product" I mean the package of software that gets installed by the installer and sold to the end user. Currently I have one solution, consisting of multiple projects, (including a Setup project), which builds a set of assemblies and create a single installer. What I need to produce are multiple products/installers, all with similar functionality, which are built from the same set of assemblies but differ in the set of resources used by one of the assemblies. What's the best way of doing this? ------------ The 95% Solution ----------------- Based upon Daminen_the_unbeliever's answer, a resource file per configuration can be achieved as follows: Create a class library project ("Satellite"). Delete the default .cs file and add a folder ("Default") Create a resource file in the folder "MyResources" Properties - set CustomToolNamespace to something appropriate (e.g. "XXX") Make sure the access modifier for the resources is "Public". Add the resources. Edit the source code. Refer to the resources in your code as XXX.MyResources.ResourceName) Create Configurations for each product variant ("ConfigN") For each product variant, create a folder ("VariantN") Copy and Paste the MyResources file into each VariantN folder Unload the "Satellite" project, and edit the .csproj file For each "VariantN/MyResources" <Compile> or <EmbeddedResource> tag, add a Condition="'$(Configuration)' == 'ConfigN'" attribute. Save, Reload the .csproj, and you're done... This creates a per-configuration resource file, which can (presumably) be further localized. Compile error messages are produced for any configuration that where a a resource is missing. The resource files can be localized using the standard method (create a second resources file (MyResources.fr.resx) and edit .csproj as before). The reason this is a 95% solution is that resources used to initialize forms (e.g. Form Titles, button texts) can't be easily handled in the same manner - the easiest approach seems to be to overwrite these with values from the satellite assembly.

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• Keeping video viewing statistics breakdown by video time in a database

  - by Septagram

  I need to keep a number of statistics about the videos being watched, and one of them is what parts of the video are being watched most. The design I came up with is to split the video into 256 intervals and keep the floating-point number of views for each of them. I receive the data as a number of intervals the user watched continuously. The problem is how to store them. There are two solutions I see. Row per every video segment Let's have a database table like this: CREATE TABLE `video_heatmap` ( `id` int(11) NOT NULL AUTO_INCREMENT, `video_id` int(11) NOT NULL, `position` tinyint(3) unsigned NOT NULL, `views` float NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `idx_lookup` (`video_id`,`position`) ) ENGINE=MyISAM Then, whenever we have to process a number of views, make sure there are the respective database rows and add appropriate values to the views column. I found out it's a lot faster if the existence of rows is taken care of first (SELECT COUNT(*) of rows for a given video and INSERT IGNORE if they are lacking), and then a number of update queries is used like this: UPDATE video_heatmap SET views = views + ? WHERE video_id = ? AND position >= ? AND position < ? This seems, however, a little bloated. The other solution I came up with is Row per video, update in transactions A table will look (sort of) like this: CREATE TABLE video ( id INT NOT NULL AUTO_INCREMENT, heatmap BINARY (4 * 256) NOT NULL, ... ) ENGINE=InnoDB Then, upon every time a view needs to be stored, it will be done in a transaction with consistent snapshot, in a sequence like this: If the video doesn't exist in the database, it is created. A row is retrieved, heatmap, an array of floats stored in the binary form, is converted into a form more friendly for processing (in PHP). Values in the array are increased appropriately and the array is converted back. Row is changed via UPDATE query. So far the advantages can be summed up like this: First approach Stores data as floats, not as some magical binary array. Doesn't require transaction support, so doesn't require InnoDB, and we're using MyISAM for everything at the moment, so there won't be any need to mix storage engines. (only applies in my specific situation) Doesn't require a transaction WITH CONSISTENT SNAPSHOT. I don't know what are the performance penalties of those. I already implemented it and it works. (only applies in my specific situation) Second approach Is using a lot less storage space (the first approach is storing video ID 256 times and stores position for every segment of the video, not to mention primary key). Should scale better, because of InnoDB's per-row locking as opposed to MyISAM's table locking. Might generally work faster because there are a lot less requests being made. Easier to implement in code (although the other one is already implemented). So, what should I do? If it wasn't for the rest of our system using MyISAM consistently, I'd go with the second approach, but currently I'm leaning to the first one. But maybe there are some reasons to favour one approach or another?

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