How to download an image from an URI and create a bitmap object from it?

Question

I'm trying to download image from a website and create bitmap based on that image. It looks like this:

    public void test()
    {
            PostWebClient client = new PostWebClient(callback);
            cookieContainer = new CookieContainer();
            client.cookies = cookieContainer;
            client.download(new Uri("SITE"));
    }

    public void callback(bool error, string res)
    {
            byte[] byteArray = UnicodeEncoding.UTF8.GetBytes(res);

            MemoryStream stream = new MemoryStream( byteArray );
            var tmp = new BitmapImage();
            tmp.SetSource(stream);
    }

I receive "Unspecified error" on last line of callback method. Interesting fact is that if I use BitmapImage(new Uri("SITE")) it works well... (I can't do this like that because I want to grab cookies from that URL. The image is an jpg. PostWebClient class -> http://paste.org/53413

Does the byteArray have the proper Length? Can you dump the content of the byteArray to a file and the image is there? — flayn, Aug 27 '12 at 13:24
Is there a Image.FromStream in the windows-phone .net version? — Pinakin Shah, Aug 27 '12 at 13:51
@Pinakin Shah no- that's why i have to create bitmap and use image.source=bitmap — Krzysztof Kaczor, Aug 27 '12 at 14:28
GOT IT! I came with similar solution: http://www.nickharris.net/2010/09/asynchronous-image-download-on-windows-phone-7/ — Krzysztof Kaczor, Aug 27 '12 at 16:23
It is the same with that difference that I have to change a little bit PostWebClient class that I use. The main thing is that to remember stream downloaded (I have used stream copy to and seek) (previously i have been changing it to stream and than once again to stream :D) — Krzysztof Kaczor, Aug 29 '12 at 10:21

Khurram · Accepted Answer · 2013-12-24T08:31:08.277

This is the simplest code from Bitmap class documentation.

  System.Net.WebRequest request = 
        System.Net.WebRequest.Create(
        "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif");
    System.Net.WebResponse response = request.GetResponse();
    System.IO.Stream responseStream = 
        response.GetResponseStream();
    Bitmap bitmap2 = new Bitmap(responseStream);

MSDN link for Bitmap

score 11 · Answer 2 · answered Sep 17 '15 at 07:30

11

The easiest way is to open a network stream via a WebClient instance and pass it to the constructor of the Bitmap class:

using (WebClient wc = new WebClient())
{
    using (Stream s = wc.OpenRead("http://hell.com/leaders/cthulhu.jpg"))
    {
        using (Bitmap bmp = new Bitmap(s))
        {
            bmp.Save("C:\\temp\\octopus.jpg");
        }
    }
}

answered Sep 17 '15 at 07:30

Krisztián Balla

19,223
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Interesting image choice – S1r-Lanzelot Aug 23 '18 at 21:42

score 3 · Answer 3 · answered Jan 18 '13 at 10:03

You can try below code:

        private Bitmap LoadPicture(string url)
        {
            HttpWebRequest wreq;
            HttpWebResponse wresp;
            Stream mystream;
            Bitmap bmp;

            bmp = null;
            mystream = null;
            wresp = null;
            try
            {
                wreq = (HttpWebRequest)WebRequest.Create(url);
                wreq.AllowWriteStreamBuffering = true;

                wresp = (HttpWebResponse)wreq.GetResponse();

                if ((mystream = wresp.GetResponseStream()) != null)
                    bmp = new Bitmap(mystream);
            }
            finally
            {
                if (mystream != null)
                    mystream.Close();

                if (wresp != null)
                    wresp.Close();
            }
            return (bmp);
        }

vitalinvent · Answer 4 · 2015-07-23T12:44:53.610

0

try this:

            string url ="http://www.google.ru/images/srpr/logo11w.png"
            PictureBox picbox = new PictureBox();
            picbox.Load(url);
            Bitmap bitmapRemote = (Bitmap) picbox.Image;

url - internet image , we create new instance object PictureBox, then calling NOT ASYNC procedure to load image from url, when image retrieved get image as bitmap. Also you can use Threading to work with form, call load in other thread and pass deleate method to retrieve image when complete .

edited Jul 23 '15 at 12:44

answered Jul 09 '15 at 07:45

vitalinvent

433
1
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11

3

Could you also add an explanation? – Robert Jul 09 '15 at 08:08

How to download an image from an URI and create a bitmap object from it?

4 Answers4

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