save uploaded image thumbnail to sql db image field  
Author Message
mr_man_345





PostPosted: Fri Dec 14 08:29:17 PST 2007 Top

ASP.Net >> save uploaded image thumbnail to sql db image field

Hi there,
Trying to allow client to upload image, thumbnail it, and save it into
sql table image field.
Code compiles & runs but image cannot be retrieved. any clues what I'm
doing wrong pls !


Dim origImage As System.Drawing.Image =
System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream)

' rewind the input stream to read it again to store the
original image in the database
FileUpload1.PostedFile.InputStream.Seek(0, SeekOrigin.Begin)

'make thumbnail

Dim thumbnail As System.Drawing.Image = New
System.Drawing.Bitmap(120, 120)
Dim thisFormat = origImage.RawFormat
Dim ms As MemoryStream = New MemoryStream()
thumbnail.Save(ms, thisFormat)
'System.Drawing.Imaging.ImageFormat.Jpeg)
ms.Seek(0, SeekOrigin.Begin)

Dim buffer(ms.Length) As Byte
ms.Read(buffer, 0, buffer.Length)

Dim cnn As New
SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings(1).ConnectionString)
cnn.Open()


STAFF_ID=26", cnn)

Dim ImageContent(buffer.Length) As Byte
Dim intStatus As Integer
intStatus = ms.Read(ImageContent, 0, buffer.Length)

prmImage.Value = ImageContent
cmd.Parameters.Add(prmImage)

cmd.ExecuteNonQuery()
cmd.Dispose()
cnn.Close()
cnn.Dispose()
Response.Write("done")

Web Programming152  
 
 
George





PostPosted: Fri Dec 14 08:29:17 PST 2007 Top

ASP.Net >> save uploaded image thumbnail to sql db image field Your code that puts image into DB looks good except i do not see anywere
where you actually put a thumbnail image into
variable 'thumbnail', you just create empty thumbnail and never make an
actual picture.
but may be you jsut skiped that code.
then probably youe code that reads image from DB is bad

PS: MemoryStream has GetBuffer method..

That would save you creation of ImageContent byte array.

George




> Hi there,
> Trying to allow client to upload image, thumbnail it, and save it into
> sql table image field.
> Code compiles & runs but image cannot be retrieved. any clues what I'm
> doing wrong pls !
>
>
> Dim origImage As System.Drawing.Image =
> System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream)
>
> ' rewind the input stream to read it again to store the
> original image in the database
> FileUpload1.PostedFile.InputStream.Seek(0, SeekOrigin.Begin)
>
> 'make thumbnail
>
> Dim thumbnail As System.Drawing.Image = New
> System.Drawing.Bitmap(120, 120)
> Dim thisFormat = origImage.RawFormat
> Dim ms As MemoryStream = New MemoryStream()
> thumbnail.Save(ms, thisFormat)
> 'System.Drawing.Imaging.ImageFormat.Jpeg)
> ms.Seek(0, SeekOrigin.Begin)
>
> Dim buffer(ms.Length) As Byte
> ms.Read(buffer, 0, buffer.Length)
>
> Dim cnn As New
> SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings(1).ConnectionString)
> cnn.Open()
>

> STAFF_ID=26", cnn)
>
> Dim ImageContent(buffer.Length) As Byte
> Dim intStatus As Integer
> intStatus = ms.Read(ImageContent, 0, buffer.Length)

> prmImage.Value = ImageContent
> cmd.Parameters.Add(prmImage)
>
> cmd.ExecuteNonQuery()
> cmd.Dispose()
> cnn.Close()
> cnn.Dispose()
> Response.Write("done")