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• Dissapearing object function??

  - by WmasterJ

  Is there a reason for object functions to be unset or deleted or simply not applied for any reason at all that isn't intentional? I am maintaining someone elses code and gone through it many times. I use Google Chromes awesome debuger and also TextMate. These help me find the origin of error relatively fast. The problem I have now is that i have an object: types. This object conatains...types. And these types have functions and other variables attached to them. For some reason in the middle of the code, this type has been passed by reference millions of times probably. When it comes to a certain part of the code parts of it, seem to have dissapeared. Puff! And it's gone..! Anyone have a clue (other than it being removed somewhere else earlier in the code, I'm already looking for that)

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• Properties of JavaScript objects

  - by clothears

  In my JavaScript, I'm using an object as an associative array. It always has the property "main", and may have others. So, when I create it I might do this: var myobject = new Object (); myobject["main"] = somevalue; Other properties may be added later. Now, at some moment I need to know whether myobject has just the one property, or several, and take different actions depending (I'm only referring to properties I've created). So far all I've found to do is something like: flag = false; for (i in myobject) { if (i=="main") continue; flag = true; break; } and then branch on flag. Or: for (i in myobject) { if (i=="main") continue; do_some_actions (); break; } These approaches work but feel to me like I've overlooked something. Is there a better approach?

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• pl/sql object types "ORA-06530: Reference to uninitialized composite" error

  - by mutoss

  hi, i have a type as follows: CREATE OR REPLACE TYPE tbusiness_inter_item_bag AS OBJECT ( item_id NUMBER, system_event_cd VARCHAR2 (20), CONSTRUCTOR FUNCTION tbusiness_inter_item_bag RETURN SELF AS RESULT ); CREATE OR REPLACE TYPE BODY tbusiness_inter_item_bag AS CONSTRUCTOR FUNCTION tbusiness_inter_item_bag RETURN SELF AS RESULT AS BEGIN RETURN; END; END; when i execute the following script, i got a "Reference to uninitialized composite" error, which is imho quite suitable. DECLARE item tbusiness_inter_item_bag; BEGIN item.system_event_cd := 'ABC'; END; This also raises the same error: item.item_id := 3; But if i change my object type into: CREATE OR REPLACE TYPE tbusiness_inter_item_bag AS OBJECT ( item_id NUMBER(1), system_event_cd VARCHAR2 (20), CONSTRUCTOR FUNCTION tbusiness_inter_item_bag RETURN SELF AS RESULT ); then the last statement raises no more error (where my "item" is still uninitialized): item.item_id := 3; Shouldn't i get the same ORA-06530 error? ps: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi

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• WCF method that updates object passed in

  - by Georgia Brown

  Am I correct in thinking that if I have a WCF OperationContract takes in an object and needs to set a property on that object so the client gets the update, I need to declare it to return the object. e.g. given a datacontract: [DataContract] public class CompositeType { [DataMember] public int Key { get; set; } [DataMember] public string Something { get; set; } } this will not work with WCF: public void GetDataUsingDataContract(CompositeType composite) { composite.Key = 42; } this will work: public CompositeType GetDataUsingDataContract(CompositeType composite) { composite.Key = 42; return new CompositeType { Key = composite.Key, Something = composite.Something }; }

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• Simple object creation with DIY-DI?

  - by Runcible

  I recently ran across this great article by Chad Perry entitled "DIY-DI" or "Do-It-Yourself Dependency Injection". I'm in a position where I'm not yet ready to use a IoC framework, but I want to head in that direction. It seems like DIY-DI is a good first step. However, after reading the article, I'm still a little confused about object creation. Here's a simple example: Using manual constructor dependency injection (not DIY-DI), this is how one must construct a Hotel object: PowerGrid powerGrid; // only one in the entire application WaterSupply waterSupply; // only one in the entire application Staff staff; Rooms rooms; Hotel hotel(staff, rooms, powerGrid, waterSupply); Creating all of these dependency objects makes it difficult to construct the Hotel object in isolation, which means that writing unit tests for Hotel will be difficult. Does using DIY-DI make it easier? What advantage does DIY-DI provide over manual constructor dependency injection?

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• Tracking object entries when "playing" a Windows Enhanced Metafile

  - by lzcd

  One of my current projects requires that I work out what colours are being used in an EMF file. I have been able to successfully whip up a file parser in C# that notes all references to colours... but haven't had any luck tracking which objects are in use across the entire file so I can apart colours that are referenced from colours that are used to paint on screen. The older style WMF files are easy as the object library starts at zero and one can simply track each "Create Object" style command... but EMF files are proving to be trickier as there seems to be preexisting entries in the library (if the "Select Object" commands I'm seeing are to be believed). Would anyone be able to either enlighten me on how to track objects in the library correctly with EMF files... or suggest an easier alternative to work out which colours are actually being used in the file (as opposed to just being defined)?

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• Jquery, "$.each(", function returns error in IE. 'Length' is null or not an object

  - by Collin Estes

  My code is working fine in FireFox but my users are restricted to IE. I'm getting an error though in IE, related to my JQUERY function. populateTable:function(returnList) { var self = this; var eat = $.evalJSON(returnList.firstChild.textContent) $.each(eat,function() { $("<tr><td>" + this.reportId + "</td><td>" + this.description + "</td><td>" + this.drawingNumber + "<td></tr>").insertAfter(self.tblResults[0].childNodes[1]); }) } IE is erring on the $.each with the message below: 'Length' is null or not an object Any ideas or maybe a workaround for the $.each function? Update: returnList is an XML document object from an Ajax call. I'm trying to retrieve the JSON object string located within the XML tag.

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• How to design this ?

  - by Akku

  how can i make this entire process as 1 single event??? http://code.google.com/apis/visualization/documentation/dev/dsl_get_started.html and draw the chart on single click? I am new to servlets please guide me When a user clicks the "go " button with some input. The data goes to the servlet say "Test3". The servlet processes the data by the user and generates/feeds the data table dynamically Then I call the html page to draw the chart as shown in the tutorial link above. The problem is when I call the servlet it gives me a long json string in the browser as given in the tutorials "google.visualization.Query.setResponse({version:'0.6',status:'ok',sig:'1333639331',table:{cols:[{............................" Then when i manually call the html page to draw the chart i am see the chart. But when I call html page directly using the request dispatcher via the servlet I dont get the result. This is my code and o/p...... I need sugession as to how should be my approach to call the chart public class Test3 extends HttpServlet implements DataTableGenerator { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { DataSourceHelper.executeDataSourceServletFlow(request, response, this , isRestrictedAccessMode() ); RequestDispatcher rd; rd = request.getRequestDispatcher("new.html");// it call's the html page which draws the chart as per the data added by the servlet..... rd.include(request, response);//forward(request, response); @Override public Capabilities getCapabilities() { return Capabilities.NONE; } protected boolean isRestrictedAccessMode() { return false; } @Override public DataTable generateDataTable(Query query, HttpServletRequest request) { // Create a data table. DataTable data = new DataTable(); ArrayList<ColumnDescription> cd = new ArrayList<ColumnDescription>(); cd.add(new ColumnDescription("name", ValueType.TEXT, "Animal name")); cd.add......... I get the following result along with unprocessed html page google.visualization.Query.setResponse({version:'0.6',statu..... <html> <head> <title>Getting Started Example</title> .... Entire html page as it is on the Browser. What I need is when a user clicks the go button the servlet should process the data and call the html page to draw the chart....Without the json string appearing on the browser.(all in one user click) What should be my approach or how should i design this.... there are no error in the code. since when i run the servlet i get the json string on the browser and then when i run the html page manually i get the chart drawn. So how can I do (servlet processing + html page drawing chart as final result) at one go without the long json string appearing on the browser. There is no problem with the html code....

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• Global find object references in NHibernate

  - by Miral

  Is it possible to perform a global reversed-find on NHibernate-managed objects? Specifically, I have a persistent class called "Io". There are a huge number of fields across multiple tables which can potentially contain an object of that type. Is there a way (given a specific instance of an Io object), to retrieve a list of objects (of any type) that actually do reference that specific object? (Bonus points if it can identify which specific fields actually contain the reference, but that's not critical.) Since the NHibernate mappings define all the links (and the underlying database has corresponding foreign key links), there ought to be some way to do it.

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• Best practices for handling math calculations in a flash project?

  - by VideoDnd

  I'm building a Flash project where it needs to handle some math, like an acceleration formula. My director has recommended a design pattern where I include the calculations directly in the flash object, but that doesn't seem like it's very good OOP. What's the best practice for calculations in Flash? Should it be a separate object, so I can keep the "non-Flash" parts together and out of the way? What are people's experiences with including it inline vs. keeping it separate?

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• get python class parent(s)

  - by John Smith

  How can I get the parent(s) object of python class?

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• Syntax to change the value of a cached object property

  - by Craig

  In an ASP.NET 3.5 VB web app, I successfully manage to cache an object containing several personal details such as name, address, etc. One of the items is CreditNum which I'd like to change in the cache on the fly. Is there a way to access this directly in the cache or do I have to destroy and rebuild the whole object just to change the value of objMemberDetails.CreditNum? The cache is set using: Public Shared Sub CacheSet(ByVal key As String, ByVal value As Object) Dim userID As String = HttpContext.Current.User.Identity.Name HttpContext.Current.Cache(key & "_" & userID) = value End Sub

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• $_SESSION['user']->getURL()

  - by Steven

  $_SESSION['user']->getURL() Is it to call the method of getURL() of object $_SESSION['user']?

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• combine two GCC compiled .o object files into a third .o file

  - by ~lucian.grijincu

  How does one combine two GCC compiled .o object files into a third .o file? $ gcc -c a.c -o a.o $ gcc -c b.c -o b.o $ ??? a.o b.o -o c.o $ gcc c.o other.o -o executable If you have access to the source files the -combine GCC flag will merge the source files before compilation: $ gcc -c -combine a.c b.c -o c.o However this only works for source files, and GCC does not accept .o files as input for this command. Normally, linking .o files does not work properly, as you cannot use the output of the linker as input for it. The result is a shared library and is not linked statically into the resulting executable. $ gcc -shared a.o b.o -o c.o $ gcc c.o other.o -o executable $ ./executable ./executable: error while loading shared libraries: c.o: cannot open shared object file: No such file or directory $ file c.o c.o: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped $ file a.o a.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped

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• Use of COM object in IIS 7

  - by Wouter d.A.

  Hi all, I am currently moving an ASP.NET web-project from an IIS 6 to a IIS 7 hosting environment. Everything seems to be running OK, except my calls to a COM object. I can perfectly instantiate an object of the COM type, but when I call one of its methods, the IIS crashes. The event log reports an error code "0xc0000374", which indicates a heap corruption. When I run the application inside the visual studio development server, everything goes well and the COM object code gets executed without any errors. This is also the case when the application is hosted on an IIS 6 machine. I have looked through all settings of the IIS 7 and have not found anything configurable for COM objects, like security or ... I have been struggling with this for a while and I'm out of ideas. Does anyone have any experience deploying COM objects on IIS 7? Your help would be very appreciated!

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• Advice for Architecture Design Logic for software application

  - by Prasad

  Hi, I have a framework of basic to complex set of objects/classes (C++) running into around 500. With some rules and regulations - all these objects can communicate with each other and hence can cover most of the common queries in the domain. My Dream: I want to provide these objects as icons/glyphs (as I learnt recently) on a workspace. All these objects can be dragged/dropped into the workspace. They have to communicate only through their methods(interface) and in addition to few iterative and conditional statements. All these objects are arranged finally to execute a protocol/workflow/dataflow/process. After drawing the flow, the user clicks the Execute/run button. All the user interaction should be multi-touch enabled. The best way to show my dream is : Jeff Han's Multitouch Video. consider Jeff is playing with my objects instead of the google maps. :-) it should be like playing a jigsaw puzzle. Objective: how can I achieve the following while working on this final product: a) the development should be flexible to enable provision for web services b) the development should enable easy web application development c) The development should enable client-server architecture - d) further it should also enable mouse based drag/drop desktop application like Adobe programs etc. I mean to say: I want to economize on investments. Now I list my efforts till now in design : a) Created an Editor (VB) where the user writes (manually) the object / class code b) On Run/Execute, the code is copied into a main() function and passed to interpreter. c) Catch the output and show it in the console. The interpreter can be separated to become a server and the Editor can become the client. This needs lot of standard client-server architecture work. But some how I am not comfortable in the tightness of this system. Without interpreter is there much faster and better embeddable solution to this? - other than writing a special compiler for these objects. Recently learned about AXIS-C++ can help me - looks like - a friend suggested. Is that the way to go ? Here are my questions: (pl. consider me a self taught programmer and NOT my domain) a) From the stage of C++ objects to multi-touch product, how can I make sure I will develop the parallel product/service models as well.? What should be architecture aspects I should consider ? b) What technologies are best suited for this? c) If I am thinking of moving to Cloud Computing, how difficult/ how redundant / how unnecessary my efforts will be ? d) How much time in months would it take to get the first beta ? I take the liberty to ask if any of the experts here are interested in this project, please email me: [email protected] Thank you for any help. Looking forward.

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• Learning to write organized and modular programs

  - by Peter

  I'm a computer science student, and I'm just starting to write relatively larger programs for my coursework (between 750 - 1500 lines). Up until now, it's been possible to get by with any reasonable level of modularization and object oriented design. However, now that I'm writing more complex code for my assignments I'd like to learn to write better code. Can anyone point me in the direction of some resources for learning about what sort of things to look for when designing your program's architecture so that you can make it as modularized as possible?

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• FormEditor receiving NULL IEditorInput object

  - by Gabriel Parenza

  Hi, I have extended IEditorInput class to define my own IEditorInput object. Furthermore, I have extended FormEditor class. I have view where I am displaying my application objects. Whenever user double clicks on items on view, I intend to display more details for this application object on the editor, which is a FormEditor. Problem I am facing is that I am receiving IEditorInput object as NULL inside extended FormEditor class. Can someone please tell me what I am doing wrong? Code: CustomFormEditor extends FormEditor CustomEditorInput extends IEditorInput In View class: PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().openEditor(new CustomEditorInput("test"),"editor.id"); Thanks, Gaurav.

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• Convert data retrieved from MySQL database into JSON object using Python/Django

  - by rohanbk

  I have a MySQL database called People which contains the following schema <id,name,foodchoice1,foodchoice2>. The database contains a list of people and the two choices of food they wish to have at a party (for example). I want to create some kind of Python web-service that will output a JSON object. An example of output should be like: { "guestlist": [ {"id":1,"name":"Bob","choice1":"chicken","choice2":"pasta"},{"id":2,"name":"Alice","choice1":"pasta","choice2":"chicken"} ], "partyname": "My awesome party", "day": "1", "month": "June", "2010": "null" } Basically every guest is stored into a dictionary 'guestlist' along with their choices of food. At the end of the JSON object is just some additional information that only needs to be mentioned once. The question that I have is regarding the method that I need to utilize to grab the data from my database, and create the JSON object. Do I need to use a standard Model/View structure of Django or can I get away with something that is much simpler since what I need to do is really simple?

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• Why Use PHP OOP over Basic Functions and When?

  - by Codex73

  There are some posts about this matter, but I didn't clearly get when to use Object Oriented coding and when to use programmatic functions in an include. Somebody also mentioned to me that OOP is very heavy to run, and makes more workload. Is this right? Lets say I have a big file with 50 functions, why will I want to call these in a class? and not by function_name(). Should I switch and create object which holds all of my functions? What will be the advantage or specific difference? What benefits does it bring to code OOP in php ? Modularity?

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• How to get object properties of specific class in SPARQL

  - by udayalkonline

  hi, I have some ontology(campus.owl).There are tree classes(Student,Sport,Lecturer).Student class is joined with Lecturer class using "has" object property and Student class joined with Sport class with "isPlay" object property. problem I want to get the object property between Student and Lecturer using some SPARQL query. PREFIX rdfs: http://www.w3.org/2000/01/rdf-schema# PREFIX rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# PREFIX my: http://www.semanticweb.org/ontologies/2010/5/Ontology1275975684120.owl# SELECT ?prop WHERE { ?prop ..........??? } Any Idea..?? Thank in advance!

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• Memory-Mapped Files & Transparent Persistence of Java Objects

  - by geeko

  Greeting All, I want to achieve transparent persistence of Java objects through memory-mapped files (utilize the OS paging/swapping mechanism). My problem is: how can I move a Java object to my memory-mapped block ? Plus, how can I force a new object instance to reside in such blocks ? As you all know, a memory-mapped block can be seen as a byte array, and what I am really asking here is how to overlap the address space of Java objects with the one of such arrays ? If Java does not allow me for this, what cross-platform & garbage-collecting OO language would you advise me to use ? Thank you all in advance.

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• IStatelessSession insert object with many-to-one

  - by Andrew Kalashnikov

  Hello guys. I've got common mapping <class name="NotSyncPrice, Portal.Core" table='Not_sync_price'> <id name="Id" unsaved-value="0"> <column name="id" not-null="true"/> <generator class="native"/> </id> <many-to-one name="City" class="Clients.Core.Domains.City, Clients.Core" column="city_id" cascade="none"></many-to-one> <!--<property name="City"> <column name="city_id"/> </property>--> I want to use IStatelessSession for batch insert. But when i set city object to NotSyncPrice object and call IStatelessSession I've got strange exception: NHibernate.Impl.StatelessSessionImpl.get_Timestamp() When its null or int all is ok. I try use real && proxy city object. But no result. What's wrong:( Please help

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• Entity Framework: Data Centric vs. Object Centric

  - by Eric J.

  I'm having a look at Entity Framework and everything I'm reading takes a data centric approach to explaining EF. By that I mean that the fundamental relationships of the system are first defined in the database and objects are generated that reflect those relationships. Examples Quickstart (Entity Framework) Using Entity Framework entities as business objects? The EF documentation implies that it's not necessary to start from the database layer, e.g. Developers can work with a consistent application object model that can be mapped to various storage schemas When designing a new system (simplified version), I tend to first create a class model, then generate business objects from the model, code business layer stuff that can't be generated, and then worry about persistence (or rather work with a DBA and let him worry about the most efficient persistence strategy). That object centric approach is well supported by ORM technologies such as (n)Hibernate. Is there a reasonable path to an object centric approach with EF? Will I be swimming upstream going that route? Any good starting points?

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• Design time error - multiple controls with the same Id

  - by ilivewithian

  I'm using VS 2008, I have a very simple page that has a bunch of uniquely named controls. When I try to view it in design mode I get the following error: Error Rendering Control - Label12 An unhanded exception has occurred. Multiple controls with the same ID 'Label1' were found. FindControl requires that controls have unique IDs I've checked the HTML and the designer file and I can only see one control called Label1. What might be causing this? Also, here is the aspx markup I'm having trouble with? <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="CoachingAppearanceReport.aspx.vb" Inherits="AcademyPro.CoachingAppearanceReport" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <div id="appearanceDetail" class="Left CriteriaContainer"> <asp:Label ID="Label1" runat="server" Text="Appearance Type" AssociatedControlID="ddlAppearanceType" /> <asp:DropDownList ID="ddlAppearanceType" runat="server" CssClass="AppType" OnDataBound="ddlAppearanceType_DataBound" DataSourceID="odsAppearanceType" DataTextField="AppearanceType" DataValueField="AppearanceTypeCode"> </asp:DropDownList> <asp:RequiredFieldValidator ID="rfvAppearanceType" runat="server" ControlToValidate="ddlAppearanceType" InitialValue="" Text="*" ErrorMessage="The appearance type must be selected" /> <asp:Label ID="lblAppearanceType" runat="server" /> <br /> <div class="SubSettings"> <asp:Label ID="Label12" runat="server" Text="Subbed for" AssociatedControlID="ddlSubbedFor" /> <asp:DropDownList ID="ddlSubbedFor" runat="server" OnDataBound="ddlSubbedFor_DataBound" DataSourceID="odsPlayersInAgeGroup" DataTextField="PlayerName" DataValueField="PlayerID"> </asp:DropDownList> <asp:Label ID="lblSubbedFor" runat="server" /> <br /> <asp:Label ID="Label13" runat="server" Text="Mins" AssociatedControlID="txtSubMins" /> <asp:TextBox ID="txtSubMins" runat="server" MaxLength="3" CssClass="TinyWidth" /> <asp:Label ID="lblSubMins" runat="server" /> </div> </div> </ContentTemplate> </asp:UpdatePanel> </form> </body> </html>

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