qtgui: fixing import statements in qtgui apps to print an error if extra python modules are not available.

1 files changed, 29 insertions, 3 deletions

diff --git a/gr-qtgui/apps/pyqt_example_f.py b/gr-qtgui/apps/pyqt_example_f.py
index 2d957c85a..5e432fe78 100755
--- a/gr-qtgui/apps/pyqt_example_f.py
+++ b/gr-qtgui/apps/pyqt_example_f.py
@@ -1,9 +1,35 @@
 #!/usr/bin/env python
+#
+# Copyright 2011 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
 
 from gnuradio import gr
-from gnuradio import qtgui
-from PyQt4 import QtGui, QtCore
-import sys, sip
+import sys
+
+try:
+    from gnuradio import qtgui
+    from PyQt4 import QtGui, QtCore
+    import sip
+except ImportError:
+    print "Error: Program requires PyQt4 and gr-qtgui."
+    sys.exit(1)
 
 class dialog_box(QtGui.QWidget):
     def __init__(self, display, control):