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  • How to properly downcast in C# with a SWIG generated interface?

    - by JG
    I've got a very large and mature C++ code base that I'm trying to use SWIG on to generate a C# interface for. I cannot change the actual C++ code itself but we can use whatever SWIG offers in the way of extending/updating it. I'm facing an issue where a function C++ is written as such: A* SomeClass::next(A*) The caller might do something like: A* acurr = 0; while( (acurr = sc->next(acurr)) != 0 ){ if( acurr isoftype B ){ B* b = (B*)a; ...do some stuff with b.. } elseif( acurr isoftype C ) ... } Essentially, iterating through a container elements that depending on their true type, do something different. The SWIG generated C# layer for the "next" function unfortunately does the following: return new A(); So the calling code in C# land cannot determine if the returned object is actually a derived class or not, it actually appears to always be the base class (which does make sense). I've come across several solutions: Use the %extend SWIG keyword to add a method on an object and ultimately call dynamic_cast. The downside to this approach, as I see it, is that this requires you to know the inheritance hierarchy. In my case it is rather huge and I see this is as a maintenance issue. Use the %factory keyword to supply the method and the derived types and have SWIG automatically generate the dynamic_cast code. This appears to be a better solution that the first, however upon a deeper look it still requires you to hunt down all the methods and all the possible derived types it could return. Again, a huge maintenance issue. I wish I had a doc link for this but I can't find one. I found out about this functionality by looking through the example code that comes with SWIG. Create a C# method to create an instance of the derived object and transfer the cPtr to the new instance. While I consider this clumsy, it does work. See an example below. public static object castTo(object fromObj, Type toType) { object retval = null; BaseClass fromObj2 = fromObj as BaseClass; HandleRef hr = BaseClass.getCPtr(fromObj2); IntPtr cPtr = hr.Handle; object toObj = Activator.CreateInstance(toType, cPtr, false); // make sure it actually is what we think it is if (fromObj.GetType().IsInstanceOfType(toObj)) { return toObj; } return retval; } Are these really the options? And if I'm not willing to dig through all the existing functions and class derivations, then I'm left with #3? Any help would be appreciated.

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  • how to insert a verify code HTML Standard Paypal

    - by user304828
    i have a product , product infor was save in table , and have a field verify_code, i will create a string by md5 and insert to this field, and i want send this verify_code to paypal then i can check response return from paypal if verify_code == response verify_code will do next action how i can do it with html standard paypal?

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  • HTML File upload field style

    - by Steven1350
    I am trying to create a file upload field that has a little bit of style to it, but I seem to be having problems finding examples of this. I know part of the reason is that the field itself varies from browser to browser. Any ideas how to do this? Or is there a way to do this without using a file element of a form that can be styled?

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  • Using User Controls in FormView templates.

    - by ProfK
    I find the repetition of sets of controls for each of the EditItemTemplate, InsertItemTemplate, and ItemTemplate templates of a FormView to be tedious and risky, in terms duplicating layout and code etc. I would much rather create a xxxDetails user control, and use this in each template, cutting layout and code location down to one location. However, this introduces several complexities for data binding scenarios. Are there any extablished patterns or practice guides for using user controls in these scenarios?

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  • Erlang: HTTP GET Parameters with Inets

    - by Ted Karmel
    The following post indicates how to make a simple get http request with Erlang's inets. exploring erlang's http client Sometimes, URLs have GET parameters: http://example.net/item?parameter1=12&parameter2=1431&parameter3=8765 Besides including the parameters in the URL itself, is there a way to create variables and then send them with the request? Example appreciated.

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  • Restart Server from ASP.NET application when AppPool is ran under LocalSystem or LocalService account

    - by kape123
    Is it possible to restart server from ASP.NET application that is hosted by LocalSystem or LocalService account. This is working when I create custom administrative account and put AppPool to run under that account: Process.Start("shutdown", "/r /d 4:1 /t 10"); However, I don't want to have custom accounts (because of password expiry and need to update all AppPools when User passwords are changed). So, is this possible?

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  • Is there simple way how to join two RouteValueDictionary values to pass parameters to Html.ActionLin

    - by atagaew
    Hi. Look on my code that i created in a partial View: <% foreach (Customer customerInfo in Model.DataRows) {%> <tr> <td> <%=Html.ActionLink( customerInfo.FullName , ((string)ViewData["ActionNameForSelectedCustomer"]) , JoinParameters(customerInfo.id, (RouteValueDictionary) ViewData["AdditionalSelectionParameters"]) , null)%> </td> <td> <%=customerInfo.LegalGuardianName %> </td> <td> <%=customerInfo.HomePhone %> </td> <td> <%=customerInfo.CellPhone %> </td> </tr> <%}%> Here I'm building simple table that showing customer's details. As you may see, in each row, I'm trying to build a link that will redirect to another action. That action requires customerId and some additional parameters. Additional parameters are different for each page where this partial View is using. So, i decided to make Action methods to pass that additional parameters in the ViewData as RouteValueDictionary instance. Now, on the view i have a problem, i need to pass customerId and that RouteValueDictionary together into Html.ActionLink method. That makes me to figure out some way of how to combine all that params into one object (either object or new RouteValueDictionary instance) Because of the way the MVC does, i can't create create a method in the codebehind class (there is no codebihind in MVC) that will join that parameters. So, i used ugly way - inserted inline code: ...script runat="server"... private RouteValueDictionary JoinParameters(int customerId, RouteValueDictionary defaultValues) { RouteValueDictionary routeValueDictionary = new RouteValueDictionary(defaultValues); routeValueDictionary.Add("customerId", customerId); return routeValueDictionary; } ...script... This way is very ugly for me, because i hate to use inline code in the View part. My question is - is there any better way of how i can mix parameters passed from the action (in ViewData, TempData, other...) and the parameter from the view when building action links. May be i can build this link in other way ? Thanks!

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  • how to use char* as char[]

    - by phunehehe
    Hello, I have a struck like this typedef struct bookStruct { char title[80]; char author[80]; } BookType; And I have two strings like this char *title = "A Book on C"; char *author = "A. Kelly"; Now I can't create a BookType like this BookType book = {title, author}; Can anyone tell me what is wrong? How can I do that?

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  • SQL Server schema-owner permissions

    - by Andrew Bullock
    if i do: CREATE SCHEMA [test] AUTHORIZATION [testuser] testuser doesn't seem to have any permissions on the schema, is this correct? I thought as the principal that owns the schema, you had full control over it? What permission do i need to grant testuser so that it has full control over the test schema only? Edit: by "full control" i mean the ability to CRUD tables, views, sprocs etc Thanks

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  • MVC-like Autogenerated Pages for Webforms

    - by CccTrash
    I noticed that MVC lets you pass in LINQ to SQL objects to its views and it will autogenerate Create, Update and View Pages based on the LINQtoSQL object. Is there anything for webforms that lets you do this kind of thing? (In a nice way with validators maybe?)

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  • jQuery not working on Popup Window

    - by Seth Duncan
    I am using ASP.Net and jQuery + jQuery UI. Everything works fine with the jQuery on any other page, however when I create a popup window with window.open(...) jQuery seems to no longer function. I have all of the script files included on the Popup's Master page, so am not sure why it won't fire. Any Thoughts?

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  • how to specify a BIGINT in a rails scaffold?

    - by webdestroya
    I am trying to create a model in ruby that uses a BIGINT datatype (as opposed to the INT done by :integer). I have search all over Google, but all I seem to find is "run an SQL statement to alter the table to a BIGINT" - This seems a bit hack-ish to me, so I wanted to know if there was a way to specify a bigint in the ruby system like :big_int or something Any ideas?

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  • Zend Framework PDF to excel type

    - by Uffo
    How can I make something like this with Zend_PDF: I have a few columns A, B, C, D, E and after them I will have some information, something like excel. A | B | C | D ss|das|dad|ds ss|das|dad|ds ss|das|dad|ds How can I create something like this with ZF_pdf? I will pull the data from DB, can you please give me an example?

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  • Android - Isn't Eclipse WYSIWYG?

    - by Dada
    Hi at all, i have downloaded Eclipse Galileo and install Android SDK for the first time. I have try to create an simple Userinterface, but i have see that i can't move the "object" directly from the stage. But i need to edit the Code or open the Property panel in order to change the position of an Element on the Stage. Isn't Eclipse WYSIWYG? D.

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  • .net component installer for COM interop

    - by daemonkid
    I have a .net component that will be called by unmanaged code. I want to create an installer for the .net component that will in one step.. -install it to the desired directory -generate the tlb file -run the regasm command The deployers of this component dont have knowledge of the .net framework. Any ideas? Thanks.

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  • scala Slider throws casting exception

    - by coubeatczech
    hello, I create an Slider object: val slider = new Slider{ min = 0 max = 30 labels = Map(0 -> new Label("Nula"),15-> new Label("Pul"),30-> new Label("Max")) paintLabels = true } when I run this, an exception is thrown: scala.swing.Label cannot be cast to java.awt.Component but why? When i browse the docs, the excpected type for labels is a Map[Int,Label].

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  • [Django] How to post to a facebook page

    - by patrick
    Hi! I need to post a status update of one of my facebook page when I create a model into my django project, but I don't know how to do it using the new facebook graph api: http://github.com/facebook/python-sdk/blob/master/src/facebook.py can you explain to me how to do it? Thanks in advance :)

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  • Differences between a conceptual UML class diagram and an ERD?

    - by Adam
    If I create a conceptual class diagram such that each class captures 'name' and 'attributes' but not 'operations', have I not basically created what would be otherwise considered an ERD? I'm trying to gain an understanding of what the differences are between creating a conceptual class diagram as I have described versus calling it a ERD? If these are still two different animals, can somebody please explain what the differences are?

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  • Add foreign key constraints to existing tables in Ruby on Rails (MySQL)

    - by randombits
    What's the best way to add foreign keys to my existing tables in Rails with an underlying MySQL database? clearly the solution should be done in a migration, as I want this versioned. Otherwise I'd create the constraints myself. I can't seem to find one, conducive response to they above. Again, the tables have already been created with previous migrations. I'm just going back now and adding referential integrity wherever it's applicable.

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  • How much Maximum Data we can store in a File in salesforce

    - by Ritesh Mehandiratta
    i searched a little for the size of file in salesforce . i found this link http://help.salesforce.com/HTViewHelpDoc?id=collab_files_size_limits.htm&language=en_US its showing that file size can be upto 2 GB.i have to store IDs in a text file and want to make it scalable for for nearly about 1 Million record .file size will be equal to 15 MB .can any one please provide some good tutorial how to create such kind of files and using it in apex for retrieving and updating data

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