How to convert 2D short array to base64

Question

I have a 2D short array coming from a C++ library. The array contains the pixels of a 16 bit grayscale image. I am trying to convert it to Base64 to display it. My C# code is as follows:

            string picture_path = "~/Picture/CT_Axial_Z/CT_Axial-Z_0111.png";
            string path = System.Web.Hosting.HostingEnvironment.MapPath(picture_path);

            if (File.Exists(path))
            {

                IntPtr gpget = Open16BitGrayImage(path);
                CImage_DLL gget = (CImage_DLL)Marshal.PtrToStructure(gpget, typeof(CImage_DLL));
                int short_size = sizeof(short);
                int p_s_cursor = 0;

                Array pshImageData = Array.CreateInstance(typeof(short), gget.m_nH, gget.m_nW);

                for (int i = 0; i < gget.m_nH; i++)
                {
                    for (int j = 0; j < gget.m_nW; j++)
                    {
                        short data = (short)Marshal.PtrToStructure(gget.pshImageData + p_s_cursor, typeof(short));
                        pshImageData.SetValue(data, i, j);
                        p_s_cursor += short_size;
                    }
                }

            }

I need to convert it to base64 and display it on canvas, how should I do it?
Sorry,my english maybe not good,But hope someone can help me~Thanks!

Answer 1

Hi @Takashi Chen ,
If you want to render the result in a canvas, maybe you can do it using JavaScript.
Using the btoa() method, btoa() accepts a "string" where each character represents an 8-bit byte – if you pass a string containing characters that can't be represented in 8 bits, it will probably break. This isn't a problem if you're actually treating the string as a byte array, but if you're trying to do something else then you'll have to encode it first.

You can refer to the example below.


Best regards,
Lan Huang

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