Converting Stream to byte[] array always returns 0 length in windows phone 8 C#

Question

I have a Stream received from a PhotoResult of photoChooserTask_Completed(object sender, PhotoResult e) event handler.

The e.ChosenPhoto itself a Stream so I assign it to Stream stream. And I converted it to byte[] array using the method below:

    public static byte[] ReadImageFile2(Stream mystream)
    {
        // The mystream.length is still full here.
        byte[] imageData = null;
        using (BinaryReader br = new BinaryReader(mystream))
        {
            imageData = br.ReadBytes(Convert.ToInt32(mystream.Length));
        }
        // But imageData.length is 0
        return imageData;
    }

I don't know what is wrong with the BinaryReader, it returns imageData with just 0 length. Tried to cast type as br.ReadBytes((int)mystream.Length) but still doesn't work.

Also tried all of the answers in Creating a byte array from a stream but still not working. Maybe my e.ChosenPhoto cannot be used as a normal Stream.

Thank you.

it's the length of the `stream` from `e.ChosenPhoto` which I pass into the method: `ReadImageFile2(stream)` — Tran Hoai Nam, Apr 19 '15 at 11:39
I see your problem has been solved, but for the record I was asking what the *value* of `mystream.Length` was. — SimpleVar, Apr 19 '15 at 12:07
Do you mean the type? If it is then `.length` returns a `long` type. — Tran Hoai Nam, Apr 19 '15 at 12:20
I meant the value. Is it 0 or is it 198723. It doesn't matter by now anyways, as it is obviously not 0. — SimpleVar, Apr 19 '15 at 12:21

score 11 · Accepted Answer · answered Apr 19 '15 at 11:17

11

According to the docs, you may have to set the position of the stream to 0 before reading it:

using (BinaryReader br = new BinaryReader(mystream))
{
    mystream.Position = 0;
    imageData = br.ReadBytes(Convert.ToInt32(mystream.Length));
}

answered Apr 19 '15 at 11:17

Grant Winney

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Thank you, works like a charm! Didn't event notice that – Tran Hoai Nam Apr 19 '15 at 11:46

Converting Stream to byte[] array always returns 0 length in windows phone 8 C#

1 Answers1