FlexiCoder Blog » Image

Image from Byte Array

flexicoder — Wed, 07 Jan 2009 16:17:00 +0000

To render an image to a picturebox using the data stored in a byte array use the following code


using (MemoryStream ms = new MemoryStream(ImageDetails.ThumbnailImage))
{
    ThumbnailImage.Image = Image.FromStream(ms);
}

Render Image using Generic Handler ASP.Net

flexicoder — Wed, 07 Jan 2009 11:27:00 +0000

The following code uses a property from an object that returns a byte array that contains an image.

public void ProcessRequest(HttpContext context)
{
    context.Response.ContentType = "image/jpg";
    if (context.Request.Params["Id"] != null)
    {
        Content selectedImage = new Content(Convert.ToInt32(context.Request.Params["Id"].ToString()));
        if (context.Request.Params["t"] == "D")
        {
            context.Response.OutputStream.Write(selectedImage.ImageDetails.FullImage, 0, selectedImage.ImageDetails.FullImage.Length);
        }
        else
        {
            context.Response.OutputStream.Write(selectedImage.ImageDetails.ThumbnailImage, 0, selectedImage.ImageDetails.ThumbnailImage.Length);
        }
    }
}

Loading Image/BLOB from SQL Server

flexicoder — Wed, 07 Jan 2009 11:18:00 +0000

If you have an image column in your SQL table you can load the bytes using the following code.

int bufferSize = Convert.ToInt32(reader.GetBytes(7,0,null,0,int.MaxValue));
_ThumbnailImage = new Byte[bufferSize];
reader.GetBytes(7, 0, _ThumbnailImage, 0, bufferSize);

The first parameter is the column number, in this case 7, call GetBytes with a null buffer first to get the number of bytes needed.

Remember that an image column, holds bytes and therefore can contain any sort of document, not necessarily an image, could be a PDF