how to convert an image object to stream

Question

0.00/5 (No votes)

See more:

Hye Everyone,

I m working in Windows Mobile 7,
and i need to convert the image stream otained from the camera capturetask,
into string to save it in my database....

void photoChooser_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK && e.ChosenPhoto != null)
            {
                 //Convert e.ChosenPhoto to string
            }
        }

how can i do this.

i have tried -

private byte[] imageByte = new Byte[e.ChosenPhoto.Length];
string imgStream = e.ChosenPhoto.Read(imageByte, 0, imageByte.Length);

but no result.

how can i convert stream to string and back to stream.

thanks in advance

Posted 29-Jan-11 1:16am

DeepsMann

Updated 3-Feb-11 1:05am

v2

Add a Solution

2 solutions

Solution 3

Hi everyone,

You can convert an Image object to a stream as:

private Stream ImageToStream(Image image1)
{
     WriteableBitmap wb = new WriteableBitmap(400,400);
     wb.Render(image1, new TranslateTransform {X=400, Y=400});
     wb.Invalidate();


     Stream myStream = new MemoryStream();
     wb.SaveJpeg(myStream, 400, 400, 0, 70);
     return myStream;
}

Cheers

Posted 3-Feb-11 1:04am

DeepsMann

Updated 3-Feb-11 1:05am

v2

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2011-01-29T01:29:00

Don't convert it to a string - convert it to a byte array. Strings have a default conversion which you do not want for image data, bytes don't. Most databases have a VarBinary as well as a VerChar which is designed to hold such data.

Then convert the image to bytes:

public static byte[] ImageToByte(Image img)
{
    ImageConverter converter = new ImageConverter();
    return (byte[])converter.ConvertTo(img, typeof(byte[]));
}

If your framework doesn't the include ImageConverter class (and I don't know if it does) you can convert it by writing the image to a stream, and then using the Stream.ToArray method but that is quite a bit less efficient.

"i tried this, but it is giving an exception

ConvertTo not implemented in base TypeConverter.

what should i do.
and also,
how can i convert this byte array back to image."

That probably means it isn't implemented in your framework - not everything is in the mobile frameworks. You can go via the messier stream though:

C#

public static byte[] ImageToByteStream(Image img)
{    byte[] data = new byte[0];
    using (MemoryStream ms = new MemoryStream())
    {
        img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        ms.Seek(0,0);
        data = ms.ToArray();
    }
    return data;
}

It is probably best if you reverse the process to go back to an image using the Bitmap.FromStream method.