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  • Converting a pointer C# type to F#??

    - by Brendon
    Hello all I am just a beginner in programing i wish covert some code from C# to F#, I have encotered this code: "float[] v1=new float[10]" I need to use this pointer to pass to the function: "ComputeBuffer bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite | ComputeMemoryFlags.UseHostPointer, v1);" If i creat an array in F# like this: "let v1 = [| 1.0..10.0 |]" and call now the funaction like this: "let bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite ||| ComputeMemoryFlags.UseHostPointer, v1)" Is it an error?? How do i pass a pointer??

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  • Can you have an extension method on a type instead of on an instance of a type?

    - by SLC
    I can have an extension method like this: DateTime d = new DateTime(); d = d.GetRandomDate(); GetRandomDate is my extension method. However the above doesn't make much sense. What would be better is: DateTime d = DateTime.GetRandomDate(); However, I don't know how to do this. An extension method created as: public static DateTime GetRandomDate(this System.DateTime dt) will only add the GetRandomDate() in the first example above, not the second one. Is there a way to achieve the desired behaviour?

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  • Print UITableView that has content off screen?

    - by Daniel
    Hi I have an iOS app that has the ability to print a UITableView. However, only th part of the tableview that is shown is printed. Is there a way to print the whole tableview, even if it has not been drawn yet? Here is the code I am using to print: UIGraphicsBeginImageContext(self.mainTableView.contentSize); [self.mainTableView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIPrintInteractionController *printer = [UIPrintInteractionController sharedPrintController]; printer.printingItem = viewImage; UIPrintInfo *info = [UIPrintInfo printInfo]; printer.printInfo = info; UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *pic, BOOL completed, NSError *error) { if (!completed && error) NSLog(@"FAILED! due to error in domain %@ with error code %u: %@", error.domain, error.code, [error localizedDescription]); }; UIButton * printButton = (UIButton *)sender; if(UIUserInterfaceIdiomPad == [[UIDevice currentDevice] userInterfaceIdiom]){ [printer presentFromRect:printButton.frame inView:self.view animated:YES completionHandler:completionHandler]; } else { [printer presentAnimated:YES completionHandler:completionHandler]; }

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  • Updating iOS application content which include images

    - by azamsharp
    I am working on a Vegetable gardening application. Apart from the vegetable name and description I also have vegetable image. Currently, I have all the images in the Supported Files folder in the Xcode project. But later on I want to update the application dynamically without having the user download a new version. When the user updates the application or downloads new data from the server that data will include the images. Can I store those images in the supporting file folder or somewhere where they can be references by just the name. RELATED QUESTION: I will also allow the user to take pictures of their vegetables and then write notes about the vegetables like "just planted", "about to harvest" etc. What is the recommended approach for storing pictures/photos. I can always store them in the user's photo library and then store the reference in the local database and then fetch and display the picture using the reference. The problem with that approach might be that if the user accidentally deletes the picture from the library then it will no longer be displayed in my application. The only way I see if to store the picture in the app local database as a BLOB.

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  • Type-safe generic data structures in plain-old C?

    - by Bradford Larsen
    I have done far more C++ programming than "plain old C" programming. One thing I sorely miss when programming in plain C is type-safe generic data structures, which are provided in C++ via templates. For sake of concreteness, consider a generic singly linked list. In C++, it is a simple matter to define your own template class, and then instantiate it for the types you need. In C, I can think of a few ways of implementing a generic singly linked list: Write the linked list type(s) and supporting procedures once, using void pointers to go around the type system. Write preprocessor macros taking the necessary type names, etc, to generate a type-specific version of the data structure and supporting procedures. Use a more sophisticated, stand-alone tool to generate the code for the types you need. I don't like option 1, as it is subverts the type system, and would likely have worse performance than a specialized type-specific implementation. Using a uniform representation of the data structure for all types, and casting to/from void pointers, so far as I can see, necessitates an indirection that would be avoided by an implementation specialized for the element type. Option 2 doesn't require any extra tools, but it feels somewhat clunky, and could give bad compiler errors when used improperly. Option 3 could give better compiler error messages than option 2, as the specialized data structure code would reside in expanded form that could be opened in an editor and inspected by the programmer (as opposed to code generated by preprocessor macros). However, this option is the most heavyweight, a sort of "poor-man's templates". I have used this approach before, using a simple sed script to specialize a "templated" version of some C code. I would like to program my future "low-level" projects in C rather than C++, but have been frightened by the thought of rewriting common data structures for each specific type. What experience do people have with this issue? Are there good libraries of generic data structures and algorithms in C that do not go with Option 1 (i.e. casting to and from void pointers, which sacrifices type safety and adds a level of indirection)?

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  • C# Extension Method for String Data Type

    - by Jimbo
    My web application deals with strings that need to be converted to numbers alot - users often put commas, currency symbols etc. in these fields so what I want to do is create a string extension method that cleans the field up and converts it to a decimal. For example: decimal myNumber = "$1,250.85".ToDecimal(); Can anyone help with this? Thanks!

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  • postgres - group by on multiple columns - master/detail type table

    - by smpillay
    I have a table order(orderid, ordernumber, clientid, orderdesc etc.,) and a corresponding status for that order on an order_status table ( statusid, orderid, statusdesc, statusNote, statustimestamp) say I have a record in order as below orderid orderumber clientid orderdesc 1111 00980065 ABC blah..blah.. and a corresponding status entries statusid orderid statusdesc statusNote statustimestamp 11 1111 recvd status blah yyyy-mm-dd:10:00 12 1111 clientproce status blah yyyy-mm-dd:11:00 13 1111 clientnotice status blah yyyy-mm-dd:15:00 14 1111 notified status blah yyyy-mm-dd:17:00 How can I get the following result (latest timestamp along with multiple columns) 1111 14 00980065 ABC blah..blah.. notified status blah yyyy-mm-dd:17:00

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  • Android: SQLite content accessing error

    - by vnshetty
    I've following code, it gives run time error as below... why? try{ String myPath = DB_PATH + DB_NAME; mDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); }catch(SQLiteException e){} Runtime Error: :sqlite returned: error code = 1, msg = no such table: android_metadata :SELECT locale FROM android_metadata failed :Failed to setLocale() when constructing, closing the database :android.database.sqlite.SQLiteException: no such table: android_metadata

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  • Casting to specific asp.net page type

    - by DEH
    I have an asp.net page with a code-behind class definition as follows: public partial class examplepage : System.Web.UI.Page I'd like to set a public property within the page that I can reference from other classes. My understanding is that if I cast to examplepage then I should be able to get at the public property that is specific to example page, as in: string test=((examplepage)HttpContext.Current.Handler).propertyX; However, when I try casting as above the compiler does not recognise examplepage. Can anyone tell me how I can cast? I have no specific namespaces defined. Thanks

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  • Stopping jQuery Jumping to Newly Loaded Content.

    - by Damien
    I have a div with is replaced upon certain user actions. These actions are performed under the div that is being replaced and in the case that the div is too large to fit completely into the view window, along with the buttons used to change it underneath, the browser will jump to the top of the newly loaded div. Which is annoying. Does anyone know of a way to stop these? Cheers. Here is the jQuery code. ChartContent is a small blob of html function UpdateChartImage(ChartContent) { //do updates on div here var existingChart = $("#" + $(ChartContent).attr("id")); existingChart.fadeOut("fast", function() { existingChart.replaceWith(ChartContent); }).fadeIn("fast"); } Incidentally I have prevented the button from doing it's default behaviour so I don't think it's related to that.

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  • C# Nullable Type question

    - by TatMing
    for example: int? taxid; if (ddlProductTax.SelectedValue == "") { taxid = null; } else { taxid = Convert.ToInt32(ddlProductTax.SelectedValue); } //Correct But int? taxid; taxid = (ddlProductTax.SelectedValue == "" ? null : Convert.ToInt32(ddlProductTax.SelectedValue)); //Error It error say and int32 cannot implicit convert. The ( ? truepart : falsepart); is not short of (if ..else..) ?

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  • How to Create A Document Type Definition

    - by DaveDev
    Hi Guys I've been creating a lot of my own custom attributes in my XHTML documents lately, and am aware that because they are custom attributes, they won't validate against the W3C standard. Isn't it true that I can specify my own DTD to make it validate? If so, can anyone tell me what's involved in doing this in an ASP.NET MVC app? Thanks Dave

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  • Inheritance and Implicit Type Casting

    - by Josué Molina
    Suppose I have the following three classes: class Animal {}; class Human : public Animal {}; class Dog : public Animal { public: void setOwner(Animal* owner) { this->owner = owner; } private: Animal* owner; }; Why is the following allowed, and what exactly is happening? Dog d; Human h; d.setOwner(&h); // ? At first, I tried to cast it like this d.setOwner(&(Animal)h), but the compiler gave me a warning, and I hit a run-time error. Edit: the warning the compiler gave me was "taking address of temporary". Why is this so?

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  • ASP.NET - How to edit 'bit' data type?

    - by Peter
    I am coding in Visual Basic. I am using a checkbox control. Now depending on its checked property I need to set/unset a bit column in a SQL Server database. Here's the code: Try conSQL.Open() Dim cmd As New SqlCommand("update Student set send_mail = " + _ sendemailCheckBox.Checked.ToString + " where student_id = '" _ + sidnolabel.Text + "'", conSQL) cmd.ExecuteNonQuery() Finally conSQL.Close() End Try The send_mail attribute is of bit datatype. This code is not working. How do I go about it?

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  • LINQ to SQL auto-generated type for stored procedure

    - by StuffHappens
    Hello. I have the following stored procedure ALTER PROCEDURE [dbo].Test AS BEGIN CREATE TABLE ##table ( ID1 int, ID2 int ) DECLARE @query varchar(MAX); INSERT INTO ##table VALUES(1, 1); SELECT * FROM ##table; END And I try to use it from C# code. I use LINQ to SQL as an O/RM. When I add the procedure to DataBaseContext it says that it can't figure out the return value of this procedure. How to modify the stored procedure so that I can use it with LINQ to SQL. Note: I need to have global template table!

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  • jquery focus on content editable without selecting everything

    - by Mark
    I have a contenteditable element that I want to focus, but only insofar as to place the cursor at the front of the element, rather selecting everything. elem.trigger('focus'); with jquery selects the entire element in chrome. How can I get it to behave the way I want, or is focus perhaps not what I'm looking for. Thanks

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  • Why can I derived from a templated/generic class based on that type in C# / C++

    - by stusmith
    Title probably doesn't make a lot of sense, so I'll start with some code: class Foo : public std::vector<Foo> { }; ... Foo f; f.push_back( Foo() ); Why is this allowed by the compiler? My brain is melting at this stage, so can anyone explain whether there are any reasons you would want to do this? Unfortunately I've just seen a similar pattern in some production C# code and wondered why anyone would use this pattern.

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  • Useless variable name in C struct type definition

    - by user1210233
    I'm implementing a linked list in C. Here's a struct that I made, which represents the linked list: typedef struct llist { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list; Isn't the "llist" basically useless. When a client uses this library and makes a new linked list, he would have the following declaration: list myList; So typing llist just before the opening brace is practically useless, right? The following code basically does the same job: typedef struct { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list;

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  • enum type in C++

    - by httpinterpret
    This works: enum TPriority { EPriorityIdle = -100, EPriorityLow = -20, EPriorityStandard = 0, EPriorityUserInput = 10, EPriorityHigh = 20 }; TPriority priority = EPriorityIdle; But this doesn't work: TPriority priority = -100; Any reason?

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