add new method qrcode_decode

README.rdoc

@@ -50,6 +50,9 @@ decodes a plethora of barcodes. Their site has a complete list.
     # ZXing#decode! will raise an error if it can't decode the image.
     ZXing.decode! 'image_without_a_code.png' #=> raises ZXing::UndecodableError
 
+    # You can call ZXing#qrcode_decode if you only want to decode QR Code
+    ZXing.qrcode_decode '/Users/ecin/qrcode.png' #=> "QRcode string"
+
 == Decodable module
 
 A Decodable module is included (pun intended) to ease using the library with objects that return the URL or file path to decode when #path or #to_s is called.

lib/zxing.rb

@@ -73,6 +73,10 @@ def self.decode_all!(file)
     Decoder.decode_all! normalize(file)
   end
 
+  def self.qrcode_decode(file)
+    Decoder.qrcode_decode normalize(file)
+  end
+
   private
   def self.normalize(file)
     file.respond_to?(:path) ? file.path : file

lib/zxing/decoder.rb

@@ -6,13 +6,15 @@ module ZXing
     Decoder = Client.new
   else
     require 'java'
-    require 'zxing/core-3.1.1-SNAPSHOT.jar'
-    require 'zxing/javase-3.1.1-SNAPSHOT.jar'
+    require 'zxing/core-3.3.0.jar'
+    require 'zxing/javase-3.3.0.jar'
 
     java_import com.google.zxing.MultiFormatReader
+    java_import com.google.zxing.qrcode.QRCodeReader
     java_import com.google.zxing.BinaryBitmap
     java_import com.google.zxing.Binarizer
     java_import com.google.zxing.common.GlobalHistogramBinarizer
+    java_import com.google.zxing.common.HybridBinarizer
     java_import com.google.zxing.LuminanceSource
     java_import com.google.zxing.client.j2se.BufferedImageLuminanceSource
     java_import com.google.zxing.multi.GenericMultipleBarcodeReader
@@ -47,6 +49,10 @@ def self.decode_all(file)
         []
       end
 
+      def self.qrcode_decode(file)
+        new(file).qrcode_decode
+      end
+
       def initialize(file)
         self.file = file
       end
@@ -59,6 +65,10 @@ def decode
         reader.decode(bitmap).to_s
       end
 
+      def qrcode_decode
+        qr_decode(bitmap) || qr_decode(hybrid_bitmap)
+      end
+
       def decode_all
         multi_barcode_reader = GenericMultipleBarcodeReader.new(reader)
 
@@ -93,6 +103,24 @@ def luminance
       def binarizer
         GlobalHistogramBinarizer.new(luminance)
       end
+
+      def hybrid_binarizer
+        HybridBinarizer.new(luminance)
+      end
+
+      def hybrid_bitmap
+        BinaryBitmap.new(hybrid_binarizer)
+      end
+
+      def qr_decode(bitmap)
+        qrcode_reader.decode(bitmap).to_s
+      rescue NativeException
+        nil
+      end
+
+      def qrcode_reader
+        @qrcode_reader ||= QRCodeReader.new
+      end
     end
   end
 end

lib/zxing/version.rb

@@ -1,3 +1,3 @@
 module ZXing
-  VERSION = "0.4.0"
+  VERSION = "0.4.1"
 end

spec/zxing_spec.rb

@@ -130,4 +130,32 @@ def path
     end
   end
 
+  describe ".qrcode_decode" do
+    subject { ZXing.qrcode_decode(file) }
+
+    context "with image1" do
+      let(:file) { File.new(fixture_image("img-0001")) }
+      it { should == "SDQI:{\"name\":\"Miss Punniya  teston120416\",\"ess_id\":\"punniya prabhu\",\"tag\":\"General\"}" }
+    end
+
+    context "with image2" do
+      let(:file) { File.new(fixture_image("img-0002")) }
+      it { should == "SDQI:{\"job seeker name\":\"Tom Gouke\",\"id\":20012,\"tag\":\"abcdefgababcdefgababcdefgababcdefgab1234abcdefgababcdefgababcdefgababcdefgab1234abcdefgababcdefgababcdefgababcdefgab1234abcdefgababcdefgababcdefgababcdefgab1234\"}" }
+    end
+
+    context "with image3" do
+      let(:file) { File.new(fixture_image("img-0003")) }
+      it { should == "SDQI:{\"name\":\"Miss Punniya  teston120416\",\"ess_id\":\"punniya prabhu\",\"tag\":\"General\"}" }
+    end
+
+    context "with image4" do
+      let(:file) { File.new(fixture_image("img-0004")) }
+      it { should == "SDQI:{\"name\":\"Miss test name long long\",\"ess_id\":101016,\"tag\":\"test tags is very long very long very long very long\"}" }
+    end
+
+    context "with image5" do
+      let(:file) { File.new(fixture_image("img-0005")) }
+      it { should == "SDQI:{\"name\":\"Able Seaman pei han\",\"ess_id\":\"111\",\"tag\":\"resume1\"}" }
+    end
+  end
 end