WP7 string to stream and back

Question

0.00/5 (No votes)

See more:

hye all...

i m working in Windows Phone 7 and i need to convert a string to a stream.

i got a photo stream to which i have converted into string as-

StreamReader sr = new StreamReader(photoStream);
                string str = sr.ReadToEnd();

now i want to convert that string back to stream and then to image as -

byte[] data = Encoding.UTF8.GetBytes(str);
            MemoryStream memStream = new MemoryStream(data);
            memStream.Seek(data.Length, 0);
            WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memStream);
            image1.Source = bimg;

but as it come to the line

WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memStream);

it gives the exception - "The parameter is incorrect."

now what should i do...:confused:
please help...
thanks in advance...

Posted 30-Jan-11 22:17pm

DeepsMann

Add a Solution

2 solutions

Solution 2

hye all,

I have converted a photo stream to string as in Windows Phone 7 (C#.net)

namespaces used :
using System.Windows.Controls; using System.IO; using System.Windows.Media.Imaging;
using System.Windows.Media;

Stream to String :

BitmapImage bimg = new BitmapImage();
                bimg.SetSource(photoStream); //photoStream is a stream containing data for a photo
                
                byte[] bytearray = null;
                using (MemoryStream ms = new MemoryStream())
                {
                    WriteableBitmap wbitmp = new WriteableBitmap(bimg);
                    wbimg.SaveJpeg(ms, wbitmp.PixelWidth, wbitmp.PixelHeight, 0, 100);
                    ms.Seek(0, SeekOrigin.Begin);
                    bytearray = ms.GetBuffer();
                }
                string str = Convert.ToBase64String(bytearray);

String to Stream and then to Image :

byte[] data = Convert.FromBase64String(str);
                        
            Stream memStream = new MemoryStream(data);

            WriteableBitmap wbimg = PictureDecoder.DecodeJpeg(memStream);

            image1.Source = wbimg;

thanks

Posted 31-Jan-11 18:15pm

DeepsMann

Comments

xbolslock 24-Apr-12 21:13pm

hi! i tried your solution but all i get back is a black image when i convert from string to stream and then to image. how do i go around solving it?? thanks!

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 · 2011-01-30T22:23:00

Solution 1

If this is image data, then I wouldn't convert it to a string: the default conversion expects unicode text data rather than binary, and will change newlines and so forth. Instead, consider converting it to a byte[] using Stream.GetBuffer

Posted 30-Jan-11 22:23pm

OriginalGriff

Comments

DeepsMann 31-Jan-11 4:39am

thanks,

but then how can i convert a byte[] back to image...

OriginalGriff 31-Jan-11 4:45am

Since you are on WP7, I think the easiest way is to convert it to a MemoryStream and then use the Bitmap(Stream) constructor.

DeepsMann 31-Jan-11 4:50am

thanks,

but i have done the same.
i have converted the byte[] to MemoryStream and then using

WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memoryStream);

i tried to convert it to image.

now what should i do.
please provide some sample if u can.

DeepsMann 31-Jan-11 4:46am

i have searched, but everywhere it uses

System.Drawing.Image.FromStream(stream);

but System.Drawing doesn't exists in WP7.