Text in einem TextBuffer einfügen

main.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from gi.repository import Gtk
import subprocess


class MainApp:
    def __init__(self):

        # Build our Interface from the XML/Glade file
        gladefile = "MainWindow.glade"
        try:
            self.builder = Gtk.Builder()
            self.builder.add_from_file(gladefile)
        except:
            print("Failed to load Glade file: %s" % gladefile)

        # Connect signals
        self.builder.connect_signals(self)

        # Get the widgets
        self.window = self.builder.get_object("MainWindow")

        # TextViews
        self.TextViewCommandInput = self.builder.get_object("TextViewCommandInput")
        self.TextViewCommandOutput = self.builder.get_object("TextViewCommandOutput")

    def onWindowDestroy(self, widget, data=None):
        Gtk.main_quit()

    def btnSendclicked(self, button, data=None):
        self.TestCommand()

    def main(self):
        self.window.show_all()
        Gtk.main()

    def Command(self, cmd, out=1):
        # Print Command
        if out == 1:
            self.TextBufferCommandInput = self.TextViewCommandInput.get_buffer()
            self.TextBufferCommandInput.insert_at_cursor(cmd + "\n")

        # Send Command
        process = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
            stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
            close_fds=True, universal_newlines=True)
        output = process.stdout.read()

        # Print Command-Output
        if out == 1:
            self.TextBufferCommandOutput = self.TextViewCommandOutput.get_buffer()
            self.TextBufferCommandOutput.insert_at_cursor(output + "\n")

    def TestCommand(self):
        cmd = "ls -l"
        self.Command(cmd)

if __name__ == "__main__":
    StartMainApp = MainApp()
    StartMainApp.main()

main_not_working.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Not working

from gi.repository import Gtk
import subprocess


class MainApp:
    def __init__(self):

        # Build our Interface from the XML/Glade file
        gladefile = "MainWindow.glade"
        try:
            self.builder = Gtk.Builder()
            self.builder.add_from_file(gladefile)
        except:
            print("Failed to load Glade file: %s" % gladefile)

        # Connect signals
        self.builder.connect_signals(self)

        # Get the widgets
        self.window = self.builder.get_object("MainWindow")

        # TextViews
        self.TextViewCommandInput = self.builder.get_object("TextViewCommandInput")
        self.TextViewCommandOutput = self.builder.get_object("TextViewCommandOutput")

    def onWindowDestroy(self, widget, data=None):
        Gtk.main_quit()

    def btnSendclicked(self, button, data=None):
        TestCommand()

    def main(self):
        self.window.show_all()
        Gtk.main()

def Command(cmd, out=1):
    GetBuffer = MainApp()
  
    # Print Command
    if out == 1:
        GetBuffer.TextBufferCommandInput = GetBuffer.TextViewCommandInput.get_buffer()
        GetBuffer.TextBufferCommandInput.insert_at_cursor(cmd + "\n")

    # Send Command
    process = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
        close_fds=True, universal_newlines=True)
    output = process.stdout.read()

    # Print Command-Output
    if out == 1:
        GetBuffer.TextBufferCommandOutput = GetBuffer.TextViewCommandOutput.get_buffer()
        GetBuffer.TextBufferCommandOutput.insert_at_cursor(output + "\n")

def TestCommand():
    cmd = "ls -l"
    Command(cmd)

if __name__ == "__main__":
    StartMainApp = MainApp()
    StartMainApp.main()

MainWindow.glade

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <object class="GtkWindow" id="MainWindow">
    <property name="can_focus">False</property>
    <property name="has_resize_grip">False</property>
    <signal name="destroy" handler="onWindowDestroy" swapped="no"/>
    <child>
      <object class="GtkBox" id="vbox">
        <property name="width_request">400</property>
        <property name="height_request">400</property>
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="border_width">5</property>
        <property name="orientation">vertical</property>
        <property name="homogeneous">True</property>
        <child>
          <object class="GtkScrolledWindow" id="scrolledwindow1">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="shadow_type">in</property>
            <child>
              <object class="GtkTextView" id="TextViewCommandInput">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="editable">False</property>
              </object>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkScrolledWindow" id="scrolledwindow2">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="shadow_type">in</property>
            <child>
              <object class="GtkTextView" id="TextViewCommandOutput">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="editable">False</property>
              </object>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkButton" id="btnSend">
            <property name="label" translatable="yes">Senden</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="use_action_appearance">False</property>
            <signal name="clicked" handler="btnSendclicked" swapped="no"/>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">2</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>