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net guru
Contributing Member
Articles: 4 Comments: 2
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| Posted: Tue Jul 01, 2008 10:57 am |
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This is one of the answers I posted on dev-exchange about a question about how to resize the images in asp.net. This example shows how to resize an image into thumbnail and full image using createthumb_fullimages function.
Add this function to your code behind
| Code: |
Function createthumb_fullimages(ByVal sOriginalImg As String, _
ByVal sThumbImgFolder As String, _
Optional ByVal sFullImgFolder As String = "") As Boolean
Try
'delegate to produce a dummy call back
Dim fakeCallBack As System.Drawing.Image.GetThumbnailImageAbort
fakeCallBack = New System.Drawing.Image.GetThumbnailImageAbort(AddressOf FakeMethod)
' Original file name
Dim sOrigFileName As String = System.IO.Path.GetFileName(sOriginalImg)
Dim oImg As System.Drawing.Image
oImg = System.Drawing.Image.FromFile(sOriginalImg)
oImg = oImg.GetThumbnailImage(80, 80, fakeCallBack, IntPtr.Zero)
oImg.Save(sThumbImgFolder + sOrigFileName, oImg.RawFormat)
' if full image is passed
If Trim(sFullImgFolder) <> "" Then
oImg = oImg.GetThumbnailImage(150, 150, fakeCallBack, IntPtr.Zero)
oImg.Save(sFullImgFolder + sOrigFileName, oImg.RawFormat)
End If
Return True
Catch ex As Exception
' some error occured. add message here
Return False
End Try
End Function
Function FakeMethod() As Boolean
Return False
End Function
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Then call this on your upload button. Make sure that you are passing full path to image
and also you are giving the image directory path.
| Code: |
Protected Sub Uploaded_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button3.Click
' Create Thumb nail and full image from the uploaded image
If (createthumb_fullimages(Server.MapPath("~") + "/someuploaded.jpg", _
Server.MapPath("~") + "/thumimgs/", _
Server.MapPath("~") + "/fullimgs/") = True) Then
Response.Write("Images created OK")
Else
Response.Write("Error Couldnt create Images")
End If
End Sub |
This may help someone out there. |
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