Merge pull request #3874 from SomberNight/zbar_windows

zbar for windows

contrib/build-wine/deterministic.spec

@@ -34,6 +34,7 @@ datas = [
     (home+'lib/wordlist/english.txt', 'electrum/wordlist'),
     (home+'lib/locale', 'electrum/locale'),
     (home+'plugins', 'electrum_plugins'),
+    ('C:\\Program Files (x86)\\ZBar\\bin\\', '.')
 ]
 datas += collect_data_files('trezorlib')
 datas += collect_data_files('btchip')

contrib/build-wine/prepare-wine.sh

@@ -4,6 +4,9 @@
 NSIS_URL=https://prdownloads.sourceforge.net/nsis/nsis-3.02.1-setup.exe?download
 NSIS_SHA256=736c9062a02e297e335f82252e648a883171c98e0d5120439f538c81d429552e
 
+ZBAR_URL=https://sourceforge.net/projects/zbarw/files/zbarw-20121031-setup.exe/download
+ZBAR_SHA256=177e32b272fa76528a3af486b74e9cb356707be1c5ace4ed3fcee9723e2c2c02
+
 LIBUSB_URL=https://prdownloads.sourceforge.net/project/libusb/libusb-1.0/libusb-1.0.21/libusb-1.0.21.7z?download
 LIBUSB_SHA256=acdde63a40b1477898aee6153f9d91d1a2e8a5d93f832ca8ab876498f3a6d2b8
 
@@ -88,8 +91,9 @@ $PYTHON -m pip install -r ../../deterministic-build/requirements-binaries.txt
 $PYTHON -m pip install https://github.com/ecdsa/pyinstaller/archive/fix_2952.zip
 
 # Install ZBar
-#wget -q -O zbar.exe "https://sourceforge.net/projects/zbar/files/zbar/0.10/zbar-0.10-setup.exe/download"
-#wine zbar.exe
+wget -q -O zbar.exe "$ZBAR_URL"
+verify_hash zbar.exe $ZBAR_SHA256
+wine zbar.exe /S
 
 
 # Upgrade setuptools (so Electrum can be installed later)

lib/qrscanner.py

@@ -29,8 +29,8 @@ import ctypes
 
 if sys.platform == 'darwin':
     name = 'libzbar.dylib'
-elif sys.platform == 'windows':
-    name = 'libzbar.dll'
+elif sys.platform in ('windows', 'win32'):
+    name = 'libzbar-0.dll'
 else:
     name = 'libzbar.so.0'
 
@@ -40,7 +40,7 @@ except OSError:
     libzbar = None
 
 
-def scan_barcode(device='', timeout=-1, display=True, threaded=False):
+def scan_barcode(device='', timeout=-1, display=True, threaded=False, try_again=True):
     if libzbar is None:
         raise RuntimeError("Cannot start QR scanner; zbar not available.")
     libzbar.zbar_symbol_get_data.restype = ctypes.c_char_p
@@ -50,6 +50,10 @@ def scan_barcode(device='', timeout=-1, display=True, threaded=False):
     proc = libzbar.zbar_processor_create(threaded)
     libzbar.zbar_processor_request_size(proc, 640, 480)
     if libzbar.zbar_processor_init(proc, device.encode('utf-8'), display) != 0:
+        if try_again:
+            # workaround for a bug in "ZBar for Windows"
+            # libzbar.zbar_processor_init always seem to fail the first time around
+            return scan_barcode(device, timeout, display, threaded, try_again=False)
         raise RuntimeError("Can not start QR scanner; initialization failed.")
     libzbar.zbar_processor_set_visible(proc)
     if libzbar.zbar_process_one(proc, timeout):