add an external method to generate barcode image.

bt5/erp5_base/ExtensionTemplateItem/BarcodeUtils.py

+def generateBarcodeImage(self, barcode_type, data):
+  # huBarcode's DataMatrix support has limitation for data size.
+  # huBarcode's QRCode support is broken.
+  # more 1-D barcode types can be added by pyBarcode library.
+  barcode_type = barcode_type.lower()
+  if barcode_type == 'datamatrix':
+    from subprocess import Popen, PIPE
+    process = Popen(['dmtxwrite'],
+                     stdin=PIPE,
+                     stdout=PIPE,
+                     stderr=PIPE,
+                     close_fds=True)
+    output, error = process.communicate(input=data)
+  elif barcode_type == 'ean13':
+    from hubarcode.ean13 import EAN13Encoder 
+    encoder = EAN13Encoder(data)
+    output = encoder.get_imagedata()
+  elif barcode_type == 'code128':
+    from hubarcode.code128 import Code128Encoder 
+    encoder = Code128Encoder(data)
+    output = encoder.get_imagedata()
+  elif barcode_type == 'qrcode':
+    import qrcode
+    from cStringIO import StringIO
+    fp = StringIO()
+    img = qrcode.make(data)
+    img.save(fp, format='png')
+    fp.seek(0)
+    output = fp.read()
+  else:
+    raise NotImplementedError, 'barcode_type=%s is not supported' % barcode_type
+  RESPONSE = self.REQUEST.RESPONSE
+  RESPONSE.setHeader('Content-Type', 'image/png')
+  RESPONSE.setHeader('Content-Length', len(output))
+  return output

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Base_generateBarcodeImage.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_function</string> </key>
+            <value> <string>generateBarcodeImage</string> </value>
+        </item>
+        <item>
+            <key> <string>_module</string> </key>
+            <value> <string>BarcodeUtils</string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>Base_generateBarcodeImage</string> </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string></string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

bt5/erp5_base/bt/change_log

+2012-04-10 Kazuhiko
+* add an external method to generate barcode image.
+
 2011-11-11 arnaud.fontaine
 * Fix document conversion not being performed when data is set directly.
 

bt5/erp5_base/bt/revision

-1019
\ No newline at end of file
+1020
\ No newline at end of file

bt5/erp5_base/bt/template_extension_id_list

-BaseMigration
\ No newline at end of file
+BaseMigration
+BarcodeUtils
\ No newline at end of file