problem in QtCreator with character "

in Qtcreator for windows, I entered QHostAddress(“192.168.1.1”), it compiled without any problem, but in the QtCreator under Ubuntu Linux, I entered the same thing and got compiler error message: stray “\302…” in program. I copied the code from windows to linux, and found when viewed in the editor inside QtCreator, “ is shown differently, “ copied from windows is longer then “ entered directly under Linux. I donot know what causes the difference? how to fix it? thanks a lot