From 17006e5285cb45a444c232beb536fa1723a4a8e7 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@gitorious>
Date: Fri, 19 Sep 2014 11:08:43 +0200
Subject: [PATCH] qr scanner: show error if not installed

---
 gui/qt/main_window.py | 7 ++++++-
 lib/qrscanner.py      | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index f41848dc0..0887d89b9 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -2144,7 +2144,12 @@ class ElectrumWindow(QMainWindow):
 
 
     def read_tx_from_qrcode(self):
-        data = run_hook('scan_qr_hook')
+        from electrum import qrscanner
+        try:
+            data = qrscanner.scan_qr(self.config)
+        except BaseException, e:
+            QMessageBox.warning(self, _('Error'), _(e), _('OK'))
+            return
         if not data:
             return
         # transactions are binary, but qrcode seems to return utf8...
diff --git a/lib/qrscanner.py b/lib/qrscanner.py
index a45e15209..0b712e609 100644
--- a/lib/qrscanner.py
+++ b/lib/qrscanner.py
@@ -8,7 +8,7 @@ except ImportError:
 
 def scan_qr(config):
     if not zbar:
-        return
+        raise BaseException("The zbar package is not available.\nOn Linux, try 'sudo apt-get install python-zbar'")
     device = config.get("video_device", "default")
     if device == 'default':
         device = ''