Merge remote-tracking branch 'manpaz/master'

escpos/escpos.py

@@ -45,7 +45,7 @@ class Escpos:
         buffer = ""
 
         self._raw(S_RASTER_N)
-        buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1], 0)
+        buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
         self._raw(binascii.unhexlify(buffer))
         buffer = ""
 
@@ -72,7 +72,7 @@ class Escpos:
 
         if im.size[0] > 512:
             print  ("WARNING: Image is wider than 512 and could be truncated at print time ")
-        if im.size[1] > 255:
+        if im.size[1] > 0xffff:
             raise ImageSizeError()
 
         im_border = self._check_image_size(im.size[0])

escpos/printer.py

@@ -41,11 +41,19 @@ class Usb(Escpos):
         if self.device is None:
             print("Cable isn't plugged in")
 
-        if self.device.is_kernel_driver_active(0):
+        check_driver = None
+
+        try:
+            check_driver = self.device.is_kernel_driver_active(0)
+        except NotImplementedError:
+            pass
+
+        if check_driver is None or check_driver:
             try:
                 self.device.detach_kernel_driver(0)
             except usb.core.USBError as e:
-                print("Could not detatch kernel driver: %s" % str(e))
+                if check_driver is not None:
+                    print("Could not detatch kernel driver: %s" % str(e))
 
         try:
             self.device.set_configuration()