QGIS » QGIS Application

import sys, os

import sip

try:

    apis = ["QDate", "QDateTime", "QString", "QTextStream", "QTime", "QUrl", "QVariant"]

    for api in apis:

        sip.setapi(api, 2)

except ValueError:

    # API has already been set so we can't set it again.

    pass

from PyQt4.QtGui import *

from PyQt4.QtCore import *

from qgis.core import *

from qgis.gui import *

class GUI(QMainWindow):

    def __init__(self, parent = None):

        QMainWindow.__init__(self, parent)

        self._map = QgsMapCanvas(self)

        self.setCentralWidget(self._map)

        """Commenting the line below, stops the crash from occuring.

        """

        self._panTool = QgsMapToolPan(self._map)

        #self._map.setMapTool(self._panTool)

#*******************************************************************************************************************                

if __name__ == '__main__':

    qgsapp = QgsApplication(sys.argv, True)

    if os.name == u'posix':

        qgsapp.setPrefixPath('/usr')

    else:

        qgsapp.setPrefixPath(os.path.join(os.environ['OSGEO4W_ROOT'], 'apps', 'qgis'))

    qgsapp.initQgis()

    gui = GUI()

    gui.show()

    gui.resize(QSize(1000, 600))

    qgsapp.exec_()

    qgsapp.exitQgis()

    print 'Segmentation fault appears after this line'

    #sys.exit()