from PyQt4.QtCore import *
from PyQt4.QtGui import *
from Ui_form import  *


class DoWebWork(QThread):
    

    strSignal = pyqtSignal(str)
    lblSignal = pyqtSignal(str)

    def __init__(self, **args):
      QThread.__init__(self)
      
    def run(self):
      self.myfunc()
    
    def myfunc(self):
      var1 = "Hello"
      var2 = "Bye!"
      self.strSignal.emit(var1)
      self.lblSignal.emit(var2)


class MainForm(QMainWindow):
    
    
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        self.ui = Ui_MainForm()
        self.ui.setupUi(self)

    def pushButton_OnClick(self):
        t = Worker()
        t.start()
        Worker.strSignal.connect(self.addToCombo)
        Worker.lblSignal.connect(self.setLabel)
    
    @pyqtSlot()
    def setLabel(self, strTxt):
        self.ui.myLabel.setText(strTxt)
        
    @pyqtSlot()
    def addToCombo(self, strName):
        self.ui.comboBox.addItem(strName)


if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    myapp = MainForm()
    myapp.show()
    sys.exit(app.exec_())

    def pushButton_OnClick(self):
        self.t = DoWebWork()
        self.t.strSignal.connect(self.addToCombo)
        self.t.lblSignal.connect(self.setLabel)
        self.t.start()