Adding text to Image - Byte[]

Question

User1610713445 posted

I have an image in byte[] format - about to be sent to a website.

I need to add a small caption to the image. I managed to get the Image into a Graphics format, and added the text. Problem is - how do I get it back to a byte[]?

private byte[] addText(byte[] filearray, string textToAdd)
        {
            MemoryStream ms = new MemoryStream(filearray, 0, filearray.Length);
            ms.Write(filearray, 0, filearray.Length);
            Image newImage = Image.FromStream(ms);
            Graphics g = Graphics.FromImage(newImage);
            g.DrawString(textToAdd, new Font("Arial", 10), Brushes.White, new PointF(0, 0));

            
        }

Answer 1

User-263151482 posted

public byte[] imageToByteArray(System.Drawing.Image imageIn)
{
 MemoryStream ms = new MemoryStream();
 imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
 return  ms.ToArray();
}

Answer 2

User1610713445 posted

That's imageToByteArray

I need GraphicsToByteArray.

Answer 3

User1610713445 posted

Not possible?

Answer 4

User-263151482 posted

You just pass it the image that you created the graphics from and the text will be in the image.

Answer 5

User1610713445 posted

Thanks.

Not sure how to do that though. I currently have:

  MemoryStream ms = new MemoryStream(filearray, 0, filearray.Length);  
             ms.Write(filearray, 0, filearray.Length);  
             Image newImage = Image.FromStream(ms);  
             Graphics g = Graphics.FromImage(newImage);  
             g.DrawString(textToAdd, new Font("Arial", 10), Brushes.White, new PointF(0, 0)); 

Answer 6

User-263151482 posted

byte[] newBytes = imageToByteArray(newImage) ;