使用ZXing生成二维码 QR-Code

转自:http://hi.baidu.com/mmforever/blog/item/1d910b551be513dab645aed8.html

直接贴上代码:

View Code
 1 package 
 2 {
 3     import flash.display.Bitmap;
 4     import flash.display.BitmapData;
 5     import flash.display.Sprite;
 6     import flash.events.Event;
 7     import flash.events.MouseEvent;
 8     import com.google.zxing.BarcodeFormat;
 9     import com.google.zxing.MultiFormatWriter;
10     import com.google.zxing.common.ByteMatrix;
11 
12     public class QR extends Sprite
13     {
14         private var qrImg:Bitmap;
15 
16         public function QR()
17         {
18             if (stage)
19             {
20                 init();
21             }
22             else
23             {
24                 this.addEventListener(Event.ADDED_TO_STAGE, init);
25             }
26         }
27 
28         private function init(e:Event = null):void
29         {
30             this.removeEventListener(Event.ADDED_TO_STAGE, init);
31             btn.addEventListener(MouseEvent.CLICK, refreshCode);
32         }
33 
34         private final function refreshCode(e:MouseEvent):void
35         {
36             if (qrImg != null)
37             {
38                 mc.removeChild(qrImg);
39                 qrImg = null;
40             }
41 
42             var textString:String = txt.text;
43             var matrix:ByteMatrix;
44             var qrEncoder:MultiFormatWriter = new MultiFormatWriter();
45             try
46             {
47                 matrix = (qrEncoder.encode(textString,BarcodeFormat.QR_CODE,150,150)) as ByteMatrix;
48             }
49             catch (e:Error)
50             {
51                 trace('err');
52                 return;
53             }
54             var bmd:BitmapData = new BitmapData(150,150,false,0x808080);
55 
56             for (var h:int = 0; h < 150; h++)
57             {
58                 for (var w:int = 0; w < 150; w++)
59                 {
60                     if (matrix._get(w,h) == 0)
61                     {
62                         bmd.setPixel(w, h, 0x000000);
63                     }
64                     else
65                     {
66                         bmd.setPixel(w, h, 0xFFFFFF);
67                     }
68                 }
69             }
70             qrImg = new Bitmap(bmd);
71             mc.addChild(qrImg);
72         }
73     }
74 }

 

ZXing 下载地址:
http://code.google.com/p/zxing/


ZXing 类库 注意点:

源代码中有两处UTF-8的问题,会导致乱码,

其一:com.google.zxing.qrcode.encoder.encoder类中的

internal const System.String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1";

此处,将ISO-8859-1改为UTF-8

其二:com.google.zxing.qrcode.decoder.DecodedBitStreamParser类的成员

private const System.String UTF8 = "UTF8";

应将UTF8改为UTF-8

 

 

本人发现,搜索网上资料,按上述修改后,生成或者读取中文的二维码仍然会出错,经调试,须修改以下位置才行。

1、生成二维码
com.google.zxing.qrcode.encoder.encoder类中
除了下面的
public static var DEFAULT_BYTE_MODE_ENCODING:String = "ISO-8859-1";
修改成
public static var DEFAULT_BYTE_MODE_ENCODING:String = "UTF-8";
外。
下面的函数须补上蓝色显示的内容

  public static function append8BitBytes(content:String , bits:BitVector , encoding:String ):void

  {

var bytes:ByteArray = new ByteArray();

 

    try {

 

      //bytes = content.getBytes(encoding);

if ((encoding == "Shift_JIS") || (encoding == "SJIS")) { bytes.writeMultiByte(content, "shift-jis");}

else if (encoding == "Cp437")     { bytes.writeMultiByte(content, "IBM437"); }

else if (encoding == "ISO8859_2") { bytes.writeMultiByte(content, "iso-8859-2"); }

    else if (encoding == "ISO8859_3") { bytes.writeMultiByte(content, "iso-8859-3"); }

    else if (encoding == "ISO8859_4") { bytes.writeMultiByte(content, "iso-8859-4"); }

    else if (encoding == "ISO8859_5") { bytes.writeMultiByte(content, "iso-8859-5"); }

    else if (encoding == "ISO8859_6") { bytes.writeMultiByte(content, "iso-8859-6"); }

    else if (encoding == "ISO8859_7") { bytes.writeMultiByte(content, "iso-8859-7"); }

    else if (encoding == "ISO8859_8") { bytes.writeMultiByte(content, "iso-8859-8"); }

    else if (encoding == "ISO8859_9") { bytes.writeMultiByte(content, "iso-8859-9"); }

    else if (encoding == "ISO8859_11"){ bytes.writeMultiByte(content, "iso-8859-11"); }

    else if (encoding == "ISO8859_15"){ bytes.writeMultiByte(content, "iso-8859-15"); }

else if ((encoding == "ISO-8859-1") || (encoding == "ISO8859-1")) { bytes.writeMultiByte(content, "iso-8859-1"); }

    else if (encoding == "UTF-8"){ bytes.writeMultiByte(content, "utf-8"); }

else

{

//other encodings not supported

throw new Error("Encoding "+ encoding + " not supported");

 

}

bytes.position = 0; 

 

    } catch (uee:Error) {

      throw new WriterException(uee.toString());

    }

    for (var i:int = 0; i < bytes.length; ++i) {

      bits.appendBits(bytes[i], 8);

    }

  }

 


2、读取二维码

打开com.google.zxing.qrcode.decoder.DecodedBitStreamParser

查看代码,不知为何,默认了使用Shift-JIS,日文编码。
以下改成默认UTF-8编码。

1)增加定义:
private static var   ASSUME_UTF_8:Boolean=true;


2)返回UTF-8,修改guessEncoding,在函数第一行增加以下内容

private static function guessEncoding(bytes:Array):String
{

if(ASSUME_UTF_8){

return UTF8;

}
………………
………………
}

 

 

另外,
ZXing类库在发布错误时出现的 
import mx.controls.Image 和 import mx.controls.List 错误提示
直接注释掉代码行就行。



 

参考资料:
http://hi.baidu.com/baid/blog/item/fd446e06d199a77702088102.html
http://blog.csdn.net/NickWar/article/details/5684134
http://www.remotesynthesis.com/post.cfm/adding-a-qr-code-reader-in-flex-on-android
http://blog.everythingflex.com/2011/03/15/flex-qr-code-sample/

posted @ 2012-05-17 15:11  FlashHK  阅读(1310)  评论(0编辑  收藏  举报