Best way to send image data to a server using WebClient

Question

I'm using Webclient to try and send my image I've got on my winform application to a central server. However I've never used WebClient before and I'm pretty sure what I'm doing is wrong.

First of all, I'm storing and displaying my image on my form like so:

_screenCap = new ScreenCapture();
_screenCap.OnUpdateStatus += _screen_CapOnUpdateStatus;
capturedImage = imjObj;
imagePreview.Image = capturedImage;

I've set up an event manager to update my imagePreview image when ever I take a screenshot. Then displaying it when ever the status changes like this:

private void _screen_CapOnUpdateStatus(object sender, ProgressEventArgs e)
{  
  imagePreview.Image = e.CapturedImage;
}

With this image I'm trying to pass it to my server like so:

using (var wc = new WebClient())
{
    wc.UploadData("http://filelocation.com/uploadimage.html", "POST", imagePreview.Image);
 }

I know I should convert the image to a byte[] but I've no idea how to do that. Could someone please point me in the right direction of go about doing this properly?

possible duplicate of [How to convert image in byte array](http://stackoverflow.com/questions/3801275/how-to-convert-image-in-byte-array) — tafa, Aug 26 '13 at 12:52

score 4 · Accepted Answer · answered Aug 26 '13 at 12:50

you can convert to byte[] like this

public byte[] imageToByteArray(System.Drawing.Image imageIn)
{
    MemoryStream ms = new MemoryStream();
    imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
    return  ms.ToArray();
}

if you have path to image, you can also do this

 byte[] bytes = File.ReadAllBytes("imagepath");

score 3 · Answer 2 · edited May 23 '17 at 11:48

3

This may help you...

using(WebClient client = new WebClient())
{
     client.UploadFile(address, filePath);
}

Refered from this.

edited May 23 '17 at 11:48

Community

1
1

answered Aug 26 '13 at 12:51

Naren

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score 0 · Answer 3 · answered Aug 26 '13 at 13:05

You need to set the ContentType header to that of image/gif or possibly binary/octet-stream and call GetBytes() on the image.

using (var wc = new WebClient { UseDefaultCredentials = true })
{
    wc.Headers.Add(HttpRequestHeader.ContentType, "image/gif");
    //wc.Headers.Add("Content-Type", "binary/octet-stream");
    wc.UploadData("http://filelocation.com/uploadimage.html",
        "POST",
        Encoding.UTF8.GetBytes(imagePreview.Image));
}

Best way to send image data to a server using WebClient

3 Answers3