CODEWITHSUNDEEP
f#image-manipulation
user376591
user376591

Reputation:

WritableBitmap: Compiler complains that type can't be found but intellisense can find it

I am learning F# by converting a program in C# to F#

The problem is with WritableBitmap, the compiler complains that:
The type tableBitmap is not defined
this is the code:

module MandelbrotBitmap
open System.Windows.Media
open System.Windows.Media.Imaging

type Mandelbrot(width:int) as this =
    let mutable _width = width
    let mutable _height = 10
    let mutable bitmap = new WritableBitmap( _width, _heights, 96.0, 96.0,
       PixelFormats.Bgr32, None)

    member this.Width 
        with get() = _width
        and set(newVal) = _width <- newVal

The None in the instanciation is my try to replace null in the original expression.
I have PresentationCore and WindowsBase in my references.

      bitmap = new WriteableBitmap(
                (int)sizeInfo.NewSize.Width, 
                (int)sizeInfo.NewSize.Height, 
                96, 96, PixelFormats.Bgr32, null);

WriteableBitmap is described in this msdn article

My question is; What is the compiler complaining about?

Upvotes: 2

Views: 218

Answers (3)

Stephen Swensen
Stephen Swensen

Reputation: 22307

You have two typos: WritableBitmap should be WriteableBitmap, and _heights should be _height. Also, null and None are not interchangeable, when you are using .NET framework classes often times you must use null, which is a interop feature of F#. One last problem, if you want to break apart your arguments across lines in the WriteableBitmap constructor, you need to make sure the next line is farther indented than new since whitespace is significant in F#. Here is the final, fixed WriteableBitmap constructor call:

new WriteableBitmap( _width, _height, 96.0, 96.0, 
    PixelFormats.Bgr32, null)

Upvotes: 6

desco
desco

Reputation: 16782

there are few typos in your code: WriteableBitmap and _heights

Upvotes: 2

Evgeny Lazin
Evgeny Lazin

Reputation: 9423

It's just a typo:

let mutable bitmap = new WriteableBitmap( _width, _heights, 96.0, 96.0,
    PixelFormats.Bgr32, None)

Upvotes: 2

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