从字节数组创建BitMapImage

Question

How do I create a bitmapimage object from a byte array. Here's my code:

System.Windows.Media.Imaging.BitmapImage image = new 
System.Windows.Media.Imaging.BitmapImage();
byte[] data = new byte[10] { 1, 0, 0, 1, 1, 1, 0, 0, 1, 0 };
using (var ms = new System.IO.MemoryStream(data))
{
    image.BeginInit();
    image.CacheOption = System.Windows.Media.Imaging.BitmapCacheOption.OnLoad;
    image.StreamSource = ms;
    image.EndInit();
}

When running the EndInit() command, I got the following exception.

No imaging component suitable to complete this operation was found.

I expected that these lines should create an image of dimension 1x10 pixels, containing two colors.

What am I doing wrong? What does the exception mean?

Thanks in advance!

Answer 1

When creating a bitmap image the image is loaded from your source based upon its encoding ( BitmapImage and Encoding ). There are many, many different encodings for bitmaps that are supported by C#.

Likely the error you are seeing is because the BitmapImage class is not finding a suitable translation from your byte array to a supported encoding. (As you can see from the encodings, many are multiples of 4 or 8, which 10 is not).

I would suggest creating a byte array that contains the correct encoding content for your desired outcome. For example the Rbg24 format would have three bytes worth of data per every pixel.

Answer 2

I think you need to use SetPixel()

byte[] data = new byte[10] { 1, 0, 0, 1, 1, 1, 0, 0, 1, 0 };
Bitmap bmp = new Bitmap(1, 10);
for (int i = 0; i < data.Length; i++)
{
  bmp.SetPixel(0, i, data[i] == 1 ? Color.Black : Color.White);
}
bmp.Save("file_path");