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AuthorForum: PowerWEB Zoom for ASP.NET
Topic: SourceImage path
kiranm4u
kiranm4u@rediffmail.com

From: Hyderabad, India
Posts: 3
Member Since: 10/16/06		 posted October 17, 2006 4:53 AM
Hi,

In my application I will get the image url instead of image physical path.

is it possible to set the PowerWEBZoom SourceImage=ImageURL
ex:zoom1.SourceImage="http:\\<ServerName>\MyImages\Image1.jpg"

or we must set the sourceImage=ImagePhysicalPah
ex:
zoom1.SourceImage="C:\MyApplication\Images\Image1.jpg"

can any one help me on this with sample code

Thanks & Regards,
Kiran
Jeff Cranford



From: Rome, NY USA
Posts: 586
Member Since: 05/30/01		 posted October 17, 2006 2:36 PM
The image must be processed before display, so you need to have a local copy. This bit of code demonstrates getting an image from a url for use on your local machine.

private void LoadFromUrl(string url, string saveName)
{
  // Get the file via HTTP
  HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

  request.AllowAutoRedirect = false;
  Stream responseStream = request.GetResponse().GetResponseStream();

  // Transfer the data to a MemoryStream
  MemoryStream mStream = new MemoryStream();
  int bytes = -1;
  do
  {
   byte[] data = new byte[1024];
   bytes = responseStream.Read(data, 0, data.Length);
   mStream.Write(data, 0, bytes);
  }while(bytes > 0);
  mStream.Position = 0;

  // Load the image into the Zoom control
  Zoom1.LoadImage(mStream, saveName);

  // ...and set this image as the active image
  Zoom1.SourceImage = saveName;
}
Jeff Cranford



From: Rome, NY USA
Posts: 586
Member Since: 05/30/01		 posted October 17, 2006 2:37 PM
Whoops, forgot to demonstrate how this method would be used.

if(!Page.IsPostBack)
  LoadFromUrl("http://www.imageafter.com/dbase/images/nature_animals_insects/b19nature_animals_insects131.jpg", "insect.jpg");
kiranm4u
kiranm4u@rediffmail.com

From: Hyderabad, India
Posts: 3
Member Since: 10/16/06		 posted October 19, 2006 7:11 AM
Hi Jeff,

Thanks for the support.
I tried your logic but it's not working for me.
Local copy of the Image not created and Blank Page displayed.

Please find the Code below..

Can you please help me where I am doing wrong.

Thanks & Regards,
Kiran


  Private Function LoadFromUrl(ByVal strUrl As String, ByVal strSaveName As String) As Boolean
    Dim objHttpWebRequest As HttpWebRequest
    Dim objWebRequest As WebRequest
    Dim objResponseStream As Stream
    Dim objMemoryStream As MemoryStream
    Dim intbytes As Integer

    Try
      objHttpWebRequest = CType(objHttpWebRequest.Create(strUrl), HttpWebRequest)
      objHttpWebRequest.AllowAutoRedirect = False
      objResponseStream = objHttpWebRequest.GetResponse.GetResponseStream
      objMemoryStream = New MemoryStream
      intbytes = -1
      Do
        Dim arrData(1024) As Byte
        intbytes = objResponseStream.Read(arrData, 0, arrData.Length)
        objMemoryStream.Write(arrData, 0, intbytes)
      Loop While intbytes > 0
      objMemoryStream.Position = 0
      Zoom1.LoadImage(objMemoryStream, strSaveName)
      Zoom1.SourceImage = strSaveName
      Return True
    Catch ex As Exception
      Return False
    Finally
      objHttpWebRequest = Nothing
      objWebRequest = Nothing
      objResponseStream = Nothing
      objMemoryStream = Nothing
    End Try
  End Function
Jeff Cranford



From: Rome, NY USA
Posts: 586
Member Since: 05/30/01		 posted October 19, 2006 12:22 PM
I did a quick VB.NET conversion of my original code and it seemed to work fine. Here is that code:

Private Sub LoadFromUrl(ByVal url As String, ByVal saveName As String)
    ' Get the file via HTTP
    Dim request As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create(url)
    request.AllowAutoRedirect = False
    Dim responseStream As System.IO.Stream = request.GetResponse().GetResponseStream()

    ' Transfer the data to a MemoryStream
    Dim mStream As New System.IO.MemoryStream
    Dim bytes As Integer = -1
    Do
      Dim data(1024) As Byte
      bytes = responseStream.Read(data, 0, data.Length)
      mStream.Write(data, 0, bytes)
    Loop While (bytes > 0)

    mStream.Position = 0

    ' Load the image into the Zoom control
    Zoom1.LoadImage(mStream, saveName)

    ' ...and set this image as the active image
    Zoom1.SourceImage = saveName
End Sub

LoadFromUrl("http://www.imageafter.com/dbase/images/nature_animals_insects/b19nature_animals_insects131.jpg", "insect.jpg")

Also, try loading the same image I am in my code snippet.
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