CODEWITHSUNDEEP
c#
carlos caponte
carlos caponte

Reputation: 23

how to convert image into bytes [] in c#

this will be a noob question. I'm new to c#

I have a file upload server control that I am using to save images to server.

I have, in my library, an image resize function with this parameter:

byte[] resizeImage(byte[] image, int witdh)

that i am supposed to use. now, i am saving my file to some path as upImage.saveas("filepath");

ok?

now, I want to resize this image and i cant figure how to convert that image to bytes???

where is the article to convert? everywhere i see, i can only see bytes to image but i want other way around..

please help?

Upvotes: 2

Views: 16291

Answers (5)

Jayakumar Thangavel
Jayakumar Thangavel

Reputation: 2007

convert the file to bytes in fileuploadcontrol on post method

public ActionResult ServiceCenterPost(ServiceCenterPost model)
{
     foreach (var file in model.FileUpload)
     {
          if (file != null && file.ContentLength > 0)
          {
             byte[] fileBytes = new byte[file.ContentLength];
             file.InputStream.Read(fileBytes, 0, Convert.ToInt32(file.ContentLength));
             string thumbpath = _fileStorageService.GetPath(fileName);
            _fileStorageService.SaveFile(thumbpath, fileBytes);
         }
     }
}

Upvotes: 1

LukeH
LukeH

Reputation: 269368

Do you mean convert the saved file to a byte[] array? If so, you can use File.ReadAllBytes:

byte[] imageBytes = File.ReadAllBytes("example.jpg");

If you want to grab the byte[] array directly from your FileUpload control then you can use the FileBytes property:

byte[] imageBytes = yourUploadControl.FileBytes;

Upvotes: 6

GWLlosa
GWLlosa

Reputation: 24403

You can use the Image.Save function, passing in a memory stream. Once it completes, you can use MemoryStream.Read or MemoryStream.ToArray to recover the bytes.

Upvotes: 0

mqp
mqp

Reputation: 71945

Well, the short answer is

File.ReadAllBytes("filepath");

But the long answer is, it doesn't sound like you have any idea what's going on, so I suggest you make sure that the image is actually encoded the way you think it is (Is it actually a bitmap on disk, or is it compressed? What does resizeImage actually do with the bytes and what kind of image does it expect? Why doesn't resizeImage take an Image and just resize it with GDI+?) Otherwise you might be in for a surprise.

Upvotes: 0

SwDevMan81
SwDevMan81

Reputation: 49978

Looks like you can save it to a MemoryStream then convert the MemoryStream to a byte array. From here

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

Upvotes: 6

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