Python Qt4 - part 006.

Today I will deal with QFileDialog widget.
You can read the more about this widget here.
This allows us to open a dialog to load a resource - a file.
The example comes with the base PyQt4 application window with a my_example dialog from fileDialogSample python class.
Into this python class, I have some variable for the file: file_name, data and my_file_open.
The my_text_edit for text area and my_button to open the QFileDialog.
Also, the vbox variable to put all on QVBoxLayout from the application.
Let's see the example:

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore

class fileDialogSample(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)

        #make text area and button
        self.my_text_edit = QtGui.QTextEdit()
        self.my_button = QtGui.QPushButton('Select File', self)

        #open the showDialog
        self.my_button.clicked.connect(self.showDialog)

        #put all into application area
        vbox = QtGui.QVBoxLayout()
        vbox.addWidget(self.my_text_edit)
        vbox.addWidget(self.my_button)
        self.setLayout(vbox)

        #set title and geometry of application
        self.setWindowTitle('File Dialog example')
        self.setGeometry(50, 50, 300, 300)

    #make a function with seeting for my QFileDialog
    def showDialog(self):
        file_name = QtGui.QFileDialog.getOpenFileName(self, 'Open file', 'C://')
        my_file_open = open(file_name)
        data = my_file_open.read()
        self.my_text_edit.setText(data)
        my_file_open.close()

#run the application 
app = QtGui.QApplication(sys.argv)
my_dialog = fileDialogSample()
my_dialog.show()
sys.exit(app.exec_())

Now, just press the Select File button, take a text file and open it.