Problem of converting a byte array to image using MemoryStream

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i am loading images to my app using this piece of code and it doesn't show the image correctly

C#

        Image [] img = new Image[100];
int i=0 ;
while (reader.Read())
        {

                string filePath = (string)reader["Path"];
                byte[] transactionContext = (byte[])reader["TransactionContext"];
                SqlFileStream sqlFileStream = new SqlFileStream(filePath, transactionContext, FileAccess.Read);
                byte[] data = new byte[(int)sqlFileStream.Length];
                sqlFileStream.Read(data, 0, Convert.ToInt32(sqlFileStream.Length));
                sqlFileStream.Close();
                MemoryStream ms = new MemoryStream();
                ms.Write(data, 0, data.Length);
                img[i] = byteArrayToImage(ms);
                ms.Seek(0, SeekOrigin.Begin);
                ms.Dispose();
                ms.Close();
                ms = null;
                data = null;
                i++;

        }

and byteArrayToImage method :

C#

public Image byteArrayToImage(MemoryStream ms)
{

    Image returnImage = Image.FromStream(ms);
    return returnImage;
}

but when i save them on the disk using this code it works perfectly :

C#

        Image [] img = new Image[100];
int i=0 ;
    while (reader.Read())
        {


            string filePath = (string)reader["Path"];
            byte[] transactionContext = (byte[])reader["TransactionContext"];
            SqlFileStream sqlFileStream = new SqlFileStream(filePath, transactionContext, FileAccess.Read);
            byte[] data = new byte[(int)sqlFileStream.Length];
            sqlFileStream.Read(data, 0, Convert.ToInt32(sqlFileStream.Length));
            sqlFileStream.Close();
            string filename = @"D:\Temp\pic" + i.ToString()+".jpeg";
            i++;
            System.IO.FileStream fs = new System.IO.FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Write);
            fs.Write(data, 0, data.Length);
            fs.Flush();
            fs.Close();
   }

Posted 12-Sep-13 19:48pm

Reza Oruji

Updated 12-Sep-13 21:10pm

v3

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2 solutions

Solution 2

Your example about file writing confuses the question.

Try this example

C# Image to Byte Array and Byte Array to Image Converter Class[^]

Posted 12-Sep-13 22:59pm

User 59241

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-09-12T19:52:00

Solution 1

You forgot to rewind the stream to position 0 after the date is written, so you are trying to read past the current stream position, where there is no data. Please look at the code sample:
http://msdn.microsoft.com/en-us/library/system.io.memorystream.aspx[^].

Now, pay attention of the line memStream.Seek(0, SeekOrigin.Begin); you should do the same.

[EDIT]

However, your code looks redundant. Do this:

C#

System.Bitmap.Image myImage = new System.Bitmap.Image(sqlFileStream);

Your second sample (with file) confirms that your sqlFileStream contains correct data.

Please see: http://msdn.microsoft.com/en-us/library/z7ha67kw.aspx[^].

—SA

Posted 12-Sep-13 19:52pm

Sergey Alexandrovich Kryukov

Updated 13-Sep-13 14:31pm

v3

Comments

Reza Oruji 13-Sep-13 2:28am

thanks sergey. but it gives same result

Sergey Alexandrovich Kryukov 13-Sep-13 11:59am

Well, please modify your code using "Improve question", comment the changed/added line(s). I don't say it's the only problem, but it was certainly one of the bugs.
Also, look properly at the code sample on the page I references, try to find out what else is missing...
—SA

Sergey Alexandrovich Kryukov 13-Sep-13 12:04pm

Also, please see my answer update, after [EDIT].
—SA

[no name] 13-Sep-13 21:18pm

Good suggestion.

Sergey Alexandrovich Kryukov 13-Sep-13 22:07pm

Thank you.
—SA