def writefile(self, filename):
    self.fixlastline()
    chars = self.encode(self.text.get("1.0", "end-1c"))
    if self.eol_convention != "\n":
        chars = chars.replace("\n", self.eol_convention)
    try:
        f = open(filename, "wb")
        f.write(chars)
        f.flush()
        f.close()
        return True
    except IOError as msg:
        tkMessageBox.showerror("I/O Error", str(msg),
                               master=self.text)
        return False