method writeInt8

This method writes a signed 8 bit number to the stream and advance the stream's position. If the write fails, then the stream's position is unaffected.

var fileStreamObj = shell.serviceManager.basics.fileStream;
var streamWriterObj = shell.serviceManager.basics.rawStreamWriter;

fileStreamObj.openForWrite("c:\\temp\\test.txt", false, true);
streamWriterObj.stream = fileStreamObj;
streamWriterObj.writeInt08(-100);

fileStreamObj.close();