Opens a file on the server and loads meta-data, the header, and the lowest resolution that fits the view window.
fileName
The file name on the server side .
Before calling this function, set IPAddress, PacketSize, and PortNumber.
The method perform an asynchronous call so the image is not actually opened and streamed until the FileOpened event is fired.
For an example that creates and opens several JpipRasterImageViewer objects, refer to JpipRasterImageViewer.