[Qgis-user] Write and Save As with python in QGIS plugin

[Suryo Miles]

I try to make plugin in QGIS and i want to make save as button but i got
error message like this

""Traceback (most recent call last):
  File "C:\Users\Mr.Pakde/.qgis2/python/plugins\latih\latihdialog.py", line
69, in

saveAs
    if not filename.isEmpty():
AttributeError: 'unicode' object has no attribute 'isEmpty'  ""

I write my code like this :

    cariButton = self.ui.btnCari
    QtCore.QObject.connect(cariButton,QtCore.SIGNAL('clicked()'),self.cari)
    saveButton = self.ui.btnSave
    QtCore.QObject.connect(saveButton,
QtCore.SIGNAL('clicked()'),self.saveAs)

    def  cari(self, event=None):
        #open dialog
        filename = QtGui.QFileDialog.getOpenFileName(self, 'Open File',
'*.xml')

    self.ui.lineFile.setText(filename)
        #panggil isi data

    self.isiDataFile(filename)

    def isiDataFile(self, nmfile):
            #buka dengan open mode baca
            teksFile = open(nmfile, 'r').read()

    self.ui.textFile.setText(teksFile)

    def _save(self, filename):
        f = open( filename, "w" )
            f.write( "%s" % self.lineFile.text() )
    f.close()
    def savefile(self):
         if self.filename:
              self._save( "%s" % self.filename )
    else:
              self.saveAs()

    def saveAs(self):
            filename = QtGui.QFileDialog(self).getSaveFileName()
            if not filename.isEmpty():
                _filename = "%s" % filename
                self._save( _filename )
                self.setFilename( _filename )
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