1 <?xml version="1.0" encoding="utf-8"?>
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3 xmlns:mx="http://www.adobe.com/2006/mxml"
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4 layout="absolute" creationComplete="{this.init();}">
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7 import com.google.zxing.common.BitMatrix;
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11 Thank you for your interest in the AS3 implementation of the zxing library.
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12 This Actionscript (AS3) code needs Flash player version 10 to run.
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13 This file is a very basic example how to use the zxing library to
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14 scan various barcodes with a standard webcam.
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15 This conversion is based on the zxing Java library, checked out from the SVN on August 7th 2009 (SVN revision ???)
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16 All additions and bugfixes added after this date have not yet been implemented in this version.
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17 This AS3 implementation has roughly the same recognition rate as revision ??? of Java implementation.
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19 How to build this example in FlexBuilder:
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20 - import this project (File->Import->Flex Project : select the 'client' folder)
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21 - uncheck 'Use default location' and press Finish
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22 - import the zxing library project (File->Import->FlexProject : select the 'core' folder)
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23 - uncheck 'Use default location' and press Finish
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24 - Right click the 'zxing client' project to select Properties
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25 - goto the 'Flex Build Path' section and select the 'Source path' tabsheet
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26 - click the 'Add Folder' button and select the 'src' directory in the 'core' project folder
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27 Now the client will use the zxing source files directly to build the application.
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28 Any updates in the library will then automatically be used by the client
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29 An an alternative would be to generate a SWC library file for the zxing.
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31 For more details, join the zxing project and please commit your bugfixes to the zxing repository.
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32 http://zxing.google.com
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37 - This project should compile with Flexbuilder 3.0 in combination with Flash10.
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38 If you do not need access to the local filesystem, Flash 9 should be sufficient to run this application.
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39 - I have omitted some very specific settings in this example application (e.g. the extended mode for code39/128 barcodes).
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40 The zxing library does handle these barcodes correctly if you set these modes correctly.
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41 - Actionscript is not very good at handling character sets with various encodings (used in e.g. in QRCodes).
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42 UTF8 and ShiftJIS encodings seem to work but I have not been able to test other character encodings.
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44 - Great performance improvements can be made but this needs quite some altering of the
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46 In order to keep the library as much in line with the original library for future updates and bugfixes,
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47 I have choosen not to implement those improvements here. I believe maintainability has a higher priority
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48 than performance at this moment
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49 I have introduced some extra classes in the
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50 com/google/zxing/common/flexdatatypes folder that match some of the default Java classes.
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51 - If you encounter bugs (and hopefully solutions) please join the zxing project and commit your fixes to
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52 the repository. Zxing project members are always willing to assist you if you're not familiar with repositories.
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53 - The Zxing project files are licensed under the Apache License, Version 2.0 (the "License");
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54 You may not use this file except in compliance with the License. You may obtain a copy of the License at
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55 http://www.apache.org/licenses/LICENSE-2.0
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56 - When using a webcam make sure you set the resolution to at least 300x300 with the setMode method of the Camera object.
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57 The default 160x120 resolution is too low for recognition of most barcodes.
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60 import mx.core.BitmapAsset;
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61 import com.google.zxing.common.flexdatatypes.HashTable;
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62 import flash.net.FileReference;
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63 import flash.display.Bitmap;
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64 import flash.display.*;
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65 import flash.net.URLRequest;
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66 import flash.events.Event;
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67 import mx.controls.Alert;
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69 import com.google.zxing.common.GlobalHistogramBinarizer;
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70 import com.google.zxing.common.ByteMatrix;
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71 import com.google.zxing.client.result.ParsedResult;
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72 import com.google.zxing.client.result.ResultParser;
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73 import com.google.zxing.DecodeHintType;
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74 import com.google.zxing.BarcodeFormat;
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75 import com.google.zxing.BinaryBitmap;
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76 import com.google.zxing.BufferedImageLuminanceSource;
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77 import com.google.zxing.MultiFormatReader;
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78 import com.google.zxing.MultiFormatWriter;
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79 import com.google.zxing.Result;
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81 private var fileRef:FileReference;
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82 private var myReader:MultiFormatReader;
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83 private var hints:HashTable;
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84 private var myWriter:MultiFormatWriter;
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86 public function init():void
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88 // initialise the generic reader
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89 myReader = new MultiFormatReader();
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92 public function decodeImage():void
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94 // did the user select an image?
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95 if (this.img.source != "")
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97 // show a message we are decoding
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98 this.resulttextarea.text = "*** decoding ***"
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101 // is the image valid?
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102 if (img.content != null)
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104 // try to decode the image
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105 this.decodeBitmapData((img.content as Bitmap).bitmapData,img.contentWidth, img.contentHeight);
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110 this.resulttextarea.text = "no image selected";
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115 this.resulttextarea.text = "*** Error in image data***"
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120 public function decodeBitmapData(bmpd:BitmapData, width:int, height:int):void
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122 // create the container to store the image data in
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123 var lsource:BufferedImageLuminanceSource = new BufferedImageLuminanceSource(bmpd);
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124 // convert it to a binary bitmap
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125 var bitmap:BinaryBitmap = new BinaryBitmap(new GlobalHistogramBinarizer(lsource));
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126 // get all the hints
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127 var ht:HashTable = null;
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128 ht = this.getAllHints()
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129 var res:Result = null;
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132 // try to decode the image
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133 res = myReader.decode(bitmap,ht);
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140 // did we find something?
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143 // no : we could not detect a valid barcode in the image
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144 this.resulttextarea.text = "<<No decoder could read the barcode>>";
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145 if (!this.bc_tryharder.selected)
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147 this.resulttextarea.text = "<<No decoder could read the barcode : Retry with the 'Try Harder' setting>>";
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152 // yes : parse the result
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153 var parsedResult:ParsedResult = ResultParser.parseResult(res);
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154 // get a formatted string and display it in our textarea
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155 this.resulttextarea.text = parsedResult.getDisplayResult();
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160 public function getAllHints():HashTable
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162 // get all hints from the user
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163 var ht:HashTable = new HashTable();
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164 if (this.bc_QR_CODE.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.QR_CODE); }
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165 if (this.bc_DATAMATRIX.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.DATAMATRIX); }
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166 if (this.bc_UPC_E.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.UPC_E); }
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167 if (this.bc_UPC_A.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.UPC_A); }
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168 if (this.bc_EAN_8.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.EAN_8); }
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169 if (this.bc_EAN_13.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.EAN_13); }
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170 if (this.bc_CODE_39.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.CODE_39);}
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171 if (this.bc_CODE_128.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.CODE_128); }
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172 if (this.bc_PDF417.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.PDF417); }
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173 if (this.bc_ITF.selected) { ht.Add(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.ITF); }
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174 if (this.bc_tryharder.selected) { ht.Add(DecodeHintType.TRY_HARDER,true); }
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179 public function clearImage():void
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181 // remove the image
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182 this.img.source = null;
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183 this.resulttextarea.text = "";
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186 public function selectFile():void
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189 fileRef = new FileReference();
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190 var fileFilter4:FileFilter = new FileFilter('JPG','*.jpg');
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191 var fileFilter1:FileFilter = new FileFilter('PNG','*.png');
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192 var fileFilter2:FileFilter = new FileFilter('GIF','*.gif');
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193 var fileFilter3:FileFilter = new FileFilter('All files','*.*');
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194 fileRef.addEventListener(Event.SELECT, selectHandler);
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195 fileRef.addEventListener(Event.COMPLETE,completeHandler);
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196 fileRef.browse([fileFilter4,
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202 public function selectHandler(event:Event):void
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204 // try to load the image
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205 fileRef.removeEventListener(Event.SELECT, selectHandler);
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209 public function completeHandler(event:Event):void
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211 // image loaded succesfully
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212 fileRef.removeEventListener(Event.COMPLETE,completeHandler);
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213 img.load(fileRef.data);
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216 public function selectNone():void
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218 // remove all hints (except the try harder hint)
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219 this.bc_QR_CODE.selected = false;
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220 this.bc_DATAMATRIX.selected = false;
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221 this.bc_UPC_E.selected = false;
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222 this.bc_UPC_A.selected = false;
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223 this.bc_EAN_8.selected = false;
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224 this.bc_EAN_13.selected = false;
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225 this.bc_CODE_128.selected = false;
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226 this.bc_CODE_39.selected = false;
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227 this.bc_ITF.selected = false;
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230 private function videoDisplay_creationComplete():void
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232 // try to attach the webcam to the videoDisplay
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233 var camera:Camera = Camera.getCamera();
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236 if ((camera.width == -1) && ( camera.height == -1))
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238 // no webcam seems to be attached -> hide videoDisplay
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239 videoDisplay.width = 0;
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240 videoDisplay.height = 0;
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241 this.videoDisplayLabel.visible = true;
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242 this.buttonBox.visible = false;
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248 // change the default mode of the webcam
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249 camera.setMode(350,350,5,true);
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250 videoDisplay.width = camera.width;
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251 videoDisplay.height = camera.height;
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252 this.videoDisplayLabel.visible = false;
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253 this.buttonBox.visible = true;
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255 videoDisplay.attachCamera(camera);
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258 Alert.show("You don't seem to have a webcam.");
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262 private function decodeSnapshot():void
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264 // try to decode the current snapshpt
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265 var bmd:BitmapData = new BitmapData(this.videoDisplay.width, this.videoDisplay.height);
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266 bmd.draw(videoDisplay);
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267 this.decodeBitmapData(bmd, this.videoDisplay.width, this.videoDisplay.height);
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271 public function generateQRCode():void
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273 // read input string
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274 var contents:String = this.QRINput.text;
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275 myWriter = new MultiFormatWriter();
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278 // try to encode the string
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279 var result:ByteMatrix = (myWriter.encode(contents,BarcodeFormat.QR_CODE,300,300)) as ByteMatrix;
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283 Alert.show('An error occurred during the encoding process');
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286 // try to generate an image with the result data
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287 var bmpd:BitmapData = new BitmapData(300, 300, false, 0x009900);
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288 var bmp:Bitmap = new Bitmap(bmpd);
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289 this.QRImage.source = bmp;
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290 for (var h:int=0;h<300;h++)
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292 for (var w:int=0;w<300;w++)
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294 if (result._get(w,h) == 0)
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296 bmpd.setPixel(w,h, 0);
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300 bmpd.setPixel(w,h, 0xFFFFFF);
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307 public function generateEANBarcode():void
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309 var name:String = "";
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310 var barcodeType:BarcodeFormat = null;
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311 var inputlength:int = 0;
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312 // set the correct parameters
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313 if (this.EAN8.selected)
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316 barcodeType = BarcodeFormat.EAN_8;
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322 barcodeType = BarcodeFormat.EAN_13;
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327 var resultBits:Array = null;
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328 var contents:String = this.EANINput.text;
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329 // do some checking
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330 if (contents.length > inputlength)
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332 Alert.show(name+' can only contain '+inputlength+' digits');
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336 while(counter < contents.length)
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339 var cc:int = contents.charCodeAt(counter);
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340 if ((cc<0x30) || (cc>0x39))
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342 Alert.show("EAN barcodes can only contain digits");
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347 while (contents.length < inputlength) { contents = "0" + contents; }
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348 this.EANINput.text = contents;
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349 myWriter = new MultiFormatWriter();
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352 // try to generate the data for the barcode
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353 var result:ByteMatrix = myWriter.encode(contents,barcodeType) as ByteMatrix;
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357 Alert.show("An error occured when making the barcode");
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359 resultBits = new Array(result.height());
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360 for (var i:int=0;i<result.height();i++)
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362 resultBits[i] = result._get(i,0);
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365 // generate an image
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366 var bmpd:BitmapData = new BitmapData(this.EANImage.width, this.EANImage.height, false, 0x009900);
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367 var bmp:Bitmap = new Bitmap(bmpd);
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368 this.EANImage.source = bmp;
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369 for (var h:int=0;h<bmpd.height;h++)
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371 var bmpdwidth:int = bmpd.width;
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372 for (var w:int=0;w<bmpdwidth;w++)
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374 if (resultBits[Math.round(w*(resultBits.length/bmpdwidth))] == 0)
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376 bmpd.setPixel(w,h, 0);
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380 bmpd.setPixel(w,h, 0xFFFFFF);
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390 <mx:Label text="Example for reading and creating barcodes with the ZXing library by Bas Vijfwinkel" fontWeight="bold" />
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392 <mx:HBox label="Read a barcode">
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393 <mx:VBox width="300">
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395 <mx:Button label="Select image" click="selectFile()" x="10" y="318"/>
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396 <mx:Button label="Decode!" click="decodeImage()" x="117" y="318"/>
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397 <mx:Button label="Clear" click="clearImage()" x="198" y="318"/>
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399 <mx:Canvas width="300" height="300" backgroundColor="white">
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400 <mx:Image id="img" width="300" height="300"/>
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402 <mx:Label text="Result :"/>
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403 <mx:TextArea id="resulttextarea" width="300" height="100" />
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406 <mx:VideoDisplay id="videoDisplay"
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407 creationComplete="videoDisplay_creationComplete();"
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410 <mx:Label id="videoDisplayLabel" text="Camera not attached" visible="false"/>
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411 <mx:HBox id="buttonBox" visible="true">
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412 <mx:Button id="button"
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413 label="Reload Camera"
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414 click="videoDisplay_creationComplete();" />
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415 <mx:Button id="snapshot"
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416 label = "Decode Snapshot"
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417 click ="decodeSnapshot();"
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420 <mx:HBox x="320" y="10">
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422 <mx:CheckBox id="bc_QR_CODE" label="QR_CODE" />
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423 <mx:CheckBox id="bc_DATAMATRIX" label="DATAMATRIX" />
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424 <mx:CheckBox id="bc_UPC_E" label="UPC_E" />
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425 <mx:CheckBox id="bc_UPC_A" label="UPC_A" />
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426 <mx:CheckBox id="bc_EAN_8" label="EAN_8" />
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427 <mx:CheckBox id="bc_EAN_13" label="EAN_13" />
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430 <mx:CheckBox id="bc_CODE_128" label="CODE_128" />
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431 <mx:CheckBox id="bc_CODE_39" label="CODE_39" />
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432 <mx:CheckBox id="bc_PDF417" label="PDF417" />
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433 <mx:CheckBox id="bc_ITF" label="ITF" />
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434 <mx:CheckBox id="bc_tryharder" label="Try Harder" />
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435 <mx:Button label="Select None" click="selectNone()" />
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440 <mx:TabNavigator label="Create a barcode">
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441 <mx:VBox label="EAN">
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442 <mx:Label text="Generate an EAN barcode"/>
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443 <mx:TextInput id="EANINput" text="type the digits here"/>
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444 <mx:RadioButton groupName="EANRB" id="EAN8" label="EAN8" selected="true"/>
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445 <mx:RadioButton groupName="EANRB" id="EAN13" label="EAN13" selected="false"/>
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446 <mx:Button label="Generate" buttonDown="{this.generateEANBarcode();}"/>
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447 <mx:Image id="EANImage" width="300" height="100" />
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449 <mx:VBox label="QRCode">
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450 <mx:Label text="Generate a QRCode"/>
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451 <mx:TextInput id="QRINput" text="type text here"/>
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452 <mx:Button label="Generate" buttonDown="{this.generateQRCode();}"/>
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453 <mx:Image id="QRImage" width="300" height="300" />
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projects / zxing.git / blob