user3755771 user3755771 - 1 month ago 8
Python Question

Pyqt Gui Freezes while in loop

Im making port scanner program with PyQt but Gui freezes when i activate loop.How can i fix that? I added time.sleep() function but it still freezes. This is the function it freezes. Thanks.

try:
time.sleep(1)
hostname=self.adres.text()
hostip=socket.gethostbyname(hostname)
uyari1="Scanning remote host, {}\n".format(hostip)
self.durum.append(uyari1)
print(uyari1)
for port in range(1,1025):
time.sleep(0.1)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex((hostip, port))
if result == 0:
time.sleep(0.01)
print ("Port {}: \t Open".format(port))
self.durum.append("Port {}: \t Open\n".format(port))
sock.close()


Full code:

import socket,os,time
from PyQt4 import QtCore, QtGui

try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s

try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(596, 412)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.label = QtGui.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(120, -10, 331, 91))
self.label.setObjectName(_fromUtf8("label"))
self.label_2 = QtGui.QLabel(self.centralwidget)
self.label_2.setGeometry(QtCore.QRect(10, 90, 91, 16))
self.label_2.setObjectName(_fromUtf8("label_2"))
self.adres = QtGui.QLineEdit(self.centralwidget)
self.adres.setGeometry(QtCore.QRect(100, 90, 371, 22))
self.adres.setObjectName(_fromUtf8("adres"))
self.durum = QtGui.QTextEdit(self.centralwidget)
self.durum.setGeometry(QtCore.QRect(10, 140, 571, 191))
self.durum.setObjectName(_fromUtf8("durum"))
self.baslat = QtGui.QPushButton(self.centralwidget)
self.baslat.setGeometry(QtCore.QRect(480, 90, 101, 21))
self.baslat.setObjectName(_fromUtf8("baslat"))
self.dosyaya = QtGui.QPushButton(self.centralwidget)
self.dosyaya.setGeometry(QtCore.QRect(490, 340, 91, 25))
self.dosyaya.setObjectName(_fromUtf8("dosyaya"))
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 596, 21))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.hakkindaa = QtGui.QPushButton(self.centralwidget)
self.hakkindaa.setGeometry(QtCore.QRect(10, 340, 91, 25))
self.hakkindaa.setObjectName(_fromUtf8("hakkindaa"))
self.hakkindaa.setText("Hakkında")
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
QtCore.QObject.connect(self.hakkindaa, QtCore.SIGNAL(_fromUtf8("clicked()")), self.hakkinda)
QtCore.QObject.connect(self.dosyaya, QtCore.SIGNAL(_fromUtf8("clicked()")), self.dosyayaya)
QtCore.QObject.connect(self.baslat, QtCore.SIGNAL(_fromUtf8("clicked()")), self.baslat_btn)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)

def hakkinda(self):
QtGui.QMessageBox.about(None, "About", "Ege Öz 2014")

def baslat_btn(self):
try:
time.sleep(1)
hostname=self.adres.text()
hostip=socket.gethostbyname(hostname)
uyari1="Scanning remote host, {}\n".format(hostip)
self.durum.append(uyari1)
print(uyari1)
for port in range(1,1025):
time.sleep(0.1)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex((hostip, port))
if result == 0:
time.sleep(0.01)
print ("Port {}: \t Open".format(port))
self.durum.append("Port {}: \t Open\n".format(port))
sock.close()

except socket.gaierror:
self.durum.append("Hostname could not be resolved.")
print("Hostname could not be resolved.")
self.adres.setText("")
except socket.error:

self.durum.append("Could not connect to server.")
print("Could not connect to server.")
self.adres.setText("")
def dosyayaya(self):
self.durum.append("Saving log file to home directory...")
ev=os.getenv("USER")
data=self.durum.toPlainText()
yol="/home/"+ev+"/portscanner.log"
f = open (yol,"w")
f.write(data)
f.close()
self.durum.append("Log file saved.")
print ("Log file saved.")
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "Port Scanner", None))
self.label.setText(_translate("MainWindow", "<html><head/><body><p align=\"center\"><span style=\" font-size:11pt; font-weight:600;\">Port Scanner</span></p><p>Enter the remote host adress and press start.</p></body></html>", None))
self.label_2.setText(_translate("MainWindow", "Remote Host:", None))
self.baslat.setText(_translate("MainWindow", "Start Scanning", None))
self.dosyaya.setText(_translate("MainWindow", "Save to file", None))

if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())

Answer

You should call QtCore.QCoreApplication.processEvents() within your for loop to make the Qt's event loop proceed the incoming event (from keyboard or mouse).