Hi,
I saw this question by accident, does this sample I once made fit the
problem?
As database is a very easy dataset file used on the serverside.
\\\needs a picturebox and 4 buttons on a windowform
Private ds As New DataSet
Private abyt() As Byte
Private fo As New OpenFileDialog
Private sf As New SaveFileDialog
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
'Reading a picture from disk and put it in a bytearray
If fo.ShowDialog = DialogResult.OK Then
Dim fs As New IO.FileStream(fo.FileName, _
IO.FileMode.Open)
Dim br As New IO.BinaryReader(fs)
abyt = br.ReadBytes(CInt(fs.Length))
br.Close()
'just to show the sample without a fileread error
Dim ms As New IO.MemoryStream(abyt)
Me.PictureBox1.Image = Image.FromStream(ms)
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal _
e As System.EventArgs) Handles Button2.Click
'writing a picture from a bytearray to disk
If sf.ShowDialog = DialogResult.OK Then
Dim fs As New IO.FileStream(sf.FileName, _
IO.FileMode.CreateNew)
Dim bw As New IO.BinaryWriter(fs)
bw.Write(abyt)
bw.Close()
End If
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal _
e As System.EventArgs) Handles Button3.Click
'writing a bytearray to a webservice dataset
Dim ws As New localhost.DataBaseUpdate
ws.SetDataset(abyt)
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button4.Click
'reading a picture from a webservice dataset
Dim ws As New localhost.DataBaseUpdate
abyt = ws.GetByte
Dim ms As New IO.MemoryStream(abyt)
Me.PictureBox1.Image = Image.FromStream(ms)
End Sub
End Class
////
\\\\Webservice
<WebMethod()> _
Public Function GetByte() As Byte()
Dim ds As New DataSet
ds.ReadXml("C:\wsblob.xml")
Return CType(ds.Tables(0).Rows(0)(0), Byte())
End Function
<WebMethod()> _
Public Sub SetDataset(ByVal abyte As Byte())
Dim ds As New DataSet
ds.Tables.Add(New DataTable("Photo"))
ds.Tables(0).Columns.Add(New DataColumn("Sample"))
ds.Tables(0).Columns(0).DataType = GetType(System.Byte())
ds.Tables(0).Rows.Add(ds.Tables(0).NewRow)
ds.Tables(0).Rows(0)(0) = abyte
ds.WriteXml("C:\wsblob.xml", XmlWriteMode.WriteSchema)
End Sub
////
I hope this helps a little bit?
Cor
"rlcavebmg" <rl*******@discussions.microsoft.com>
I am new to Web Services and .NET development, and I have a question.
I am writing a service that will create a bitmap image and return it to
the
client. First, I wrote a method that looked like this:
public System.Drawing.Bitmap CreateImage() {...}
When I tried to create the web reference in my client program, I got an
error message stating that the System.Drawing.Bitmap object could not be
serialized because it does not have a public default constructor. Then I
changed the method to something like this:
public bool CreateImage(ref System.Drawing.Bitmap bitmap) {...}
Unfortunately, this resulted in the same error message.
The help for the Bitmap class indicates that it has been declared with the
[serializable] attribute, which leads me to believe that what I am doing
should work. Alas, it does not.
Does anyone know what I need to do to make this work, or have a sample
program that does something similar?
Thanks,
Bob