saving an image from a byte array

[JamesB]

I am saving image files from my website using the downloaddata on the web
client. This gives me a byte array, which I am then saving to a file with
the following code:

' Create the new, empty data file.
If File.Exists(Img Dest) Then
Console.WriteLi ne("{0} already exists!", ImgDest)
Return
End If
Dim fs As New FileStream(ImgD est, FileMode.Create New)
' Create the writer for data.
Dim w As New BinaryWriter(fs )
' Write data to Test.data.
w.Write(ImgArra y)
w.Close()
fs.Close()

This works, in that I end up with the file(s) on my machine, but if I try
and open them they come up as invalid. Any clues? Am I missing a step to do
with image headers or something?
James.

[Cor Ligthert [MVP]]

Re: saving an image from a byte array

James,

Have a look at this sample on our website.

http://www.windowsformsdatagridhelp.com/default.aspx?ID=5ad37c7b-3732-4558-8dd7-e68d238952a5

I hope this helps,

Cor

[Mythran]

Re: saving an image from a byte array


"JamesB" <jamesb@jmb.i s-a-geekWhoDoesntLi keSpam.com> wrote in message
news:42ef3da0$0 $24548$da0feed9 @news.zen.co.uk ...[color=blue]
>I am saving image files from my website using the downloaddata on the web
>client. This gives me a byte array, which I am then saving to a file with
>the following code:
>
> ' Create the new, empty data file.
> If File.Exists(Img Dest) Then
> Console.WriteLi ne("{0} already exists!", ImgDest)
> Return
> End If
> Dim fs As New FileStream(ImgD est, FileMode.Create New)
> ' Create the writer for data.
> Dim w As New BinaryWriter(fs )
> ' Write data to Test.data.
> w.Write(ImgArra y)
> w.Close()
> fs.Close()
>
> This works, in that I end up with the file(s) on my machine, but if I try
> and open them they come up as invalid. Any clues? Am I missing a step to
> do with image headers or something?
> James.
>[/color]

Since it's binary data you are writing, I would use the BinaryWriter. But,
since it's an image, I would actually read the byte array into a
MemoryStream, create an Image class instance, then call it's "Save" method.

Mythran

[JamesB]

Re: saving an image from a byte array


"Mythran" <kip_potter@hot mail.comREMOVET RAIL> wrote in message
news:ebpoqh3lFH A.420@TK2MSFTNG P09.phx.gbl...[color=blue]
>
>
> Since it's binary data you are writing, I would use the BinaryWriter.[/color]
But,[color=blue]
> since it's an image, I would actually read the byte array into a
> MemoryStream, create an Image class instance, then call it's "Save"[/color]
method.[color=blue]
>[/color]


Thanks for both replies- turns out after more checking my method did
actually work... there was a bug in the way I was building my url from other
places in the app that I hadn't spotted!
I'll do some more testing and if it does give more problems I'll look into
the suggestions you've both given.
Thanks
James