动态创建缩略图

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    Function CreateJPEGThumbnail(ByVal inSourceFile As String,ByVal inDestinationFile As String,ByVal ThumbWidth As Integer,ByVal ThumbHeight As Integer) As Boolean
     
        Dim imageFile As System.Drawing.Image
        Dim outputFstream As New FileStream(inSourceFile,FileMode.Open,FileAccess.Read) 
        'Exposes a System.IO.Stream around a file,supporting both synchronous and asynchronous read and write operations.
        Dim ImageAbortCallBack As System.Drawing.Image.GetThumbnailImageAbort 
        'This method returns true if it decides that the System.Drawing.Image.GetThumbnailImage method should prematurely stop execution; otherwise,it returns false.

        imageFile = System.Drawing.Image.FromStream(outputFstream)
        ImageAbortCallBack = New System.Drawing.Image.GetThumbnailImageAbort(AddressOf ImageAbortDummyCallback)
        imageFile = imageFile.GetThumbnailImage(ThumbWidth,ThumbHeight,ImageAbortCallBack,IntPtr.Zero) 
        'IntPtr = A platform-specific type that is used to represent a pointer or a handle.
        imageFile.Save(inDestinationFile,System.Drawing.Imaging.ImageFormat.Jpeg)
        outputFstream.Close()
        outputFstream = Nothing
        imageFile = Nothing

    End Function

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