System.Drawing.Bitmap到字节数组

Question

I have a Bitmap from a resource and need to put it in a byte array. I have a SetPixel Methode for manipulating pixels in my Byte Array. That works all well. What I want to do, is to load first a picture in the array that I can manipulate it later.

I tried quite a lot to acomplish that. First what I have:

var resources = new ComponentResourceManager(typeof(Game));
var bmp = (Bitmap)(resources.GetObject("imgBall.Image"));

the only so far not giving me an error message (but displaying the picutre wrong) is this:

width = (int)bmp.Width;
height = (int)bmp.Height;
System.Windows.Media.PixelFormat pf = PixelFormats.Rgb24;
rawStride = (width * pf.BitsPerPixel + 7) / 8;
byte[] pixelData = new byte[rawStride * height];    

MemoryStream ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
pixelData = ms.GetBuffer();

then I tried solutions I could find in stack overflow already:

ImageConverter imgConverter = new ImageConverter();
pixelData = (System.Byte[])imgConverter.ConvertTo(bmp, Type.GetType("System.Byte[]"));

This changes the size of pixelData, so that I cannot use it anymore...

using (MemoryStream memory = new MemoryStream())
            {
                bmp.Save(memory, ImageFormat.Bmp);
                memory.Position = 0;
                var bitmapImage = new BitmapImage();
                bitmapImage.BeginInit();
                memory.Seek(0, SeekOrigin.Begin);
                bitmapImage.StreamSource = memory;
                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
                bitmapImage.EndInit();
                int stride = width * ((bitmapImage.Format.BitsPerPixel + 7) / 8);                                

                bitmapImage.CopyPixels(pixelData, stride, 0);                
            }

here at the CopyPixels line I am confused: when I take rawStride from above (84) I get an error message it needs to be at lease 112. When I calculate stride for bitmapImage (112) it complains it needs to be minimum 3136. I even tried to enter the number of stride manually it compains allways it needs to be bigger.

I have the feeling that I understand something completely wrong here.

Answer 1

public string BitmapToBase64(BitmapImage bi)
{
  MemoryStream ms = new MemoryStream();
  PngBitmapEncoder encoder = new PngBitmapEncoder();
  encoder.Frames.Add(BitmapFrame.Create(bi));
  encoder.Save(ms);
  byte[] bitmapdata = ms.ToArray();

  return Convert.ToBase64String(bitmapdata);
}

This should do the thing. Just return the byteArray if that is what you want.