WPF/WinForms/GDI interop: converting a WriteableBitmap to a System.Drawing.Image?

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春和景丽
春和景丽 2021-01-23 01:05

How can I convert a WPF WriteableBitmap object to a System.Drawing.Image?

My WPF client app sends bitmap data to a web service, and the web service needs to construct a

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  • 2021-01-23 01:21

    The question is for WPF, and Pixels does not appear to be a property of WriteableBitmap. Some of the answers here point to SilverLight articles, so I suspect this might be a difference between WPF and SilverLight.

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  • 2021-01-23 01:30

    If your bitmap data is uncompressed, you could probably use this System.Drawing.Bitmap constructor: Bitmap(Int32, Int32, Int32, PixelFormat, IntPtr).

    If the bitmap is encoded as jpg or png, create a MemoryStream from the bitmap data, and use it with the Bitmap(Stream) constructor.

    EDIT:

    Since you're sending the bitmap to a web service, I suggest you encode it to begin with. There are several encoders in the System.Windows.Media.Imaging namespace. For example:

        WriteableBitmap bitmap = ...;
        var stream = new MemoryStream();               
        var encoder = new JpegBitmapEncoder(); 
        encoder.Frames.Add( BitmapFrame.Create( bitmap ) ); 
        encoder.Save( stream ); 
        byte[] buffer = stream.GetBuffer(); 
        // Send the buffer to the web service   
    

    On the receiving end, simply:

        var bitmap = new System.Drawing.Bitmap( new MemoryStream( buffer ) );
    

    Hope that helps.

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  • 2021-01-23 01:35

    this blog post shows how to encode your WriteableBitmap as a jpeg image. Perhaps that helps?

    If you really want to transfer the raw image data (pixels) you could:

    1. create a System.Drawing.Bitmap with the correct size
    2. iterate over your raw data, convert the raw data to a System.Drawing.Color (e.g. via Color.FromArgb() and set each pixel color in the newly created image via SetPixel()

    I'd definitely prefer the first solution (the one described in the blog post).

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