Hi all!

I have created an image upload feature on my application that worked well; by taking the image, converting it to a stream then saving the data as a byte in my db.

 I now want to resize the image before upload, resizing any image over 500px wide.  I have created the function, but whenever I convert the stream (now a MemoryStream rather than my original stream.IO) all of the bytes are 0.

My code is as follows:

ImageStream = file.InputStream
objImage = System.Drawing.Image.FromStream(ImageStream, True)

imgWidth = objImage.Width
imgHeight = objImage.Height

If imgWidth > 500 Then
   ResizedHeight = objImage.Height / (objImage.Width / 500)
   objThumbnail = objImage.GetThumbnailImage(500, ResizedHeight, Nothing, System.IntPtr.Zero)
End If

Dim ThumbStream As New MemoryStream
objThumbnail.Save(ThumbStream, Imaging.ImageFormat.Jpeg)

Dim uploadedFile(ThumbStream.Length) As Byte
ThumbStream.Read(uploadedFile, 0, ThumbStream.Length)

 Any clues where I've gone wrong?

Cheers

Hi, take a look at my earlier post at:

http://forums.asp.net/thread/1594882.aspx

Hope it helps.

Regards

smcoxon

Thanks for the post. I've read the thread, but I can't seem to resolve my problem.

The previous thread saves the image to the filesystem - although I am saving to a stream I imagine this shouldn't be too different; but converting it to bytes still seems to cause problems.

Using the WatchWindow the bytes are coming out Byte[0] = 0; Byte[1] = 0 ..........

Not exactly sure but look at using ToArray instead of length. 

Dim uploadedFile(ThumbStream.ToArray) As Byte

Hey man, thanks for the hint....so easy when you know how!

Here is the working code:

'Format image
Dim OriginalBM As Bitmap = New Bitmap(file.InputStream)

imgWidth = OriginalBM.Width
imgHeight = OriginalBM.Height

Dim stream As New IO.MemoryStream

If imgWidth > 500 Then
 ResizedHeight = OriginalBM.Height / (OriginalBM.Width / 500)
 Dim newSize As Size = New Size(500, ResizedHeight)
 Dim ResizedBM As Bitmap = New Bitmap(OriginalBM, newSize)

 ResizedBM.Save(stream, Imaging.ImageFormat.Jpeg)
End If

 If you're looking to put this data into a db, then just use stream.ToArray as the parameter input value

Happy coding!

Glad it worked.

Smcoxon