Thumbnail of web page

Question

User943411029 posted

hi friends

how i can make the thumbnail image of the web pages in the asp.net(vb languages) in web application

Answer 1

User-976791803 posted

<script language="VB" runat="server">

  Sub Page_Load(Sender As Object, E As EventArgs)
	
        Dim originalimg, thumb As System.Drawing.Image
        Dim FileName As String
        Dim inp As New IntPtr()
        Dim width, height As Integer
        Dim rootpath As String

        rootpath = Server.MapPath("/") ' Get Root Application Folder

        FileName = rootpath & Request.QueryString("FileName") ' Root Folder + FileName
        Try
            originalimg = originalimg.FromFile(FileName) ' Fetch User Filename
        Catch
            originalimg = originalimg.FromFile(rootpath & "error.gif") ' Fetch error.gif
        End Try

        ' Get width using QueryString.
        If Request.QueryString("width") = Nothing Then
            width = originalimg.Width  ' Use original Width. 
        ElseIf Request.QueryString("width") = 0 Then  ' Assign default width of 100.
            width = 100
        Else
            width = Request.QueryString("width") ' Use User Specified width.
        End If

        ' Get height using QueryString.
        If Request.QueryString("height") = Nothing Then
            height = originalimg.Height ' Use original Height.
        ElseIf Request.QueryString("height") = 0 Then ' Assign default height of 100.
            height = 100
        Else
            height = Request.QueryString("height") ' Use User Specified height.
        End If

        thumb = originalimg.GetThumbnailImage(width, height, Nothing, inp)

        ' Sending Response JPEG type to the browser. 
        Response.ContentType = "image/jpeg"
        thumb.Save(Response.OutputStream, Imaging.ImageFormat.Jpeg)

        ' Disposing the objects.
        originalimg.Dispose()
        thumb.Dispose()

  End Sub
</script>

Usage

http://<servername>/thumbnailimage.aspx?filename=<filename>&width=75&height=75

Where filename should be path relative to the root of the application folder. width & height are optional. If not specified, then the original width and height will be used.

If width or height are specified as 0, then the default width / height of 100 pixels is used.

Examples

http://localhost/thumbnailimage.aspx?filename=win2000.gif

http://localhost/thumbnailimage.aspx?filename=win2000.gif&width=0&height=0

http://localhost/thumbnailimage.aspx?filename=win2000.gif&width=50&height=50

http://localhost/test/thumbnailimage.aspx?filename=test/win2000.gif

Notes

By default the thumbnail image generated is of type JPEG. One can change the Response.Type by changing the following code.

Response.ContentType = "image/jpeg"
thumb.Save(Response.OutputStream, Imaging.ImageFormat.Jpeg) 'Change jpeg word 

with the required supported format(Gif, Png, Bmp etc).

For details see here http://www.codeproject.com/KB/aspnet/thumbnail_image.aspx 

 

 

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Answer 2

User943411029 posted

i want thumbnail image of the web page just like the home page of the yahoo.com

Answer 3

User113421904 posted

Hi gajanan,

Here is one ASP.NET control for your purpose, see if this helps. 

http://www.eggheadcafe.com/tutorials/aspnet/b7cce396-e2b3-42d7-9571-cdc4eb38f3c1/build-a-selfcaching-asp.aspx