.NET 创建动态缩略图

概述.NET 创建动态缩略图

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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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总结

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