This method reads a string until the end of the stream is reached.
The string is treated as if it is encoded by the
encoding type passed in.
var fileStreamObj = shell.serviceManager.basics.fileStream;
var streamReaderObj = shell.serviceManager.basics.rawStreamReader;
//test.txt file must be created by using rawStreamWriter
//for proper read back
fileStreamObj.openForRead("c:\\temp\\test.txt");
streamReaderObj.stream = fileStreamObj;
var entireFile = streamReaderObj.readStringTillEndOfStream("");
fileStreamObj.close();