C# 二维码生成读取(zxing)

/** Copyright 2007 ZXing authors** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/using System;using MultiFormatOneDReader = com.google.zxing.oned.MultiFormatOneDReader;using PDF417Reader = com.google.zxing.pdf417.PDF417Reader;using QRCodeReader = com.google.zxing.qrcode.QRCodeReader;using DataMatrixReader = com.google.zxing.datamatrix.DataMatrixReader;namespace com.google.zxing{/// <summary> MultiFormatReader is a convenience class and the main entry point into the library for most uses./// By default it attempts to decode all barcode formats that the library supports. Optionally, you/// can provide a hints object to request different behavior, for example only decoding QR codes./// /// </summary>/// <author> Sean Owen/// </author>/// <author> dswitkin@google.com (Daniel Switkin)/// </author>/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source /// </author>public sealed class MultiFormatReader : Reader{/// <summary> This method adds state to the MultiFormatReader. By setting the hints once, subsequent calls/// to decodeWithState(image) can reuse the same set of readers without reallocating memory. This/// is important for performance in continuous scan clients./// /// </summary>/// <param name="hints">The set of hints to use for subsequent calls to decode(image)/// </param>public System.Collections.Hashtable Hints{set{this.hints = value;bool tryHarder = value != null && value.ContainsKey(DecodeHintType.TRY_HARDER);System.Collections.ArrayList formats = value == null?null:(System.Collections.ArrayList) value[DecodeHintType.POSSIBLE_FORMATS];readers = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));if (formats != null){bool addOneDReader = formats.Contains(BarcodeFormat.UPC_A) || formats.Contains(BarcodeFormat.UPC_E) || formats.Contains(BarcodeFormat.EAN_13) || formats.Contains(BarcodeFormat.EAN_8) || formats.Contains(BarcodeFormat.CODE_39) || formats.Contains(BarcodeFormat.CODE_128) || formats.Contains(BarcodeFormat.ITF);// Put 1D readers upfront in "normal" modeif (addOneDReader && !tryHarder){readers.Add(new MultiFormatOneDReader(value));}if (formats.Contains(BarcodeFormat.QR_CODE)){readers.Add(new QRCodeReader());}if (formats.Contains(BarcodeFormat.DATAMATRIX)){readers.Add(new DataMatrixReader());}if (formats.Contains(BarcodeFormat.PDF417)){readers.Add(new PDF417Reader());}// At end in "try harder" modeif (addOneDReader && tryHarder){readers.Add(new MultiFormatOneDReader(value));}}if ((readers.Count == 0)){if (!tryHarder){readers.Add(new MultiFormatOneDReader(value));}readers.Add(new QRCodeReader());// TODO re-enable once Data Matrix is ready// readers.addElement(new DataMatrixReader());// TODO: Enable once PDF417 has passed QA//readers.addElement(new PDF417Reader());if (tryHarder){readers.Add(new MultiFormatOneDReader(value));}}}}private System.Collections.Hashtable hints;private System.Collections.ArrayList readers;/// <summary> This version of decode honors the intent of Reader.decode(BinaryBitmap) in that it/// passes null as a hint to the decoders. However, that makes it inefficient to call repeatedly./// Use setHints() followed by decodeWithState() for continuous scan applications./// /// </summary>/// <param name="image">The pixel data to decode/// </param>/// <returns> The contents of the image/// </returns>/// <throws> ReaderException Any errors which occurred </throws>public Result decode(BinaryBitmap image){Hints = null;return decodeInternal(image);}/// <summary> Decode an image using the hints provided. Does not honor existing state./// /// </summary>/// <param name="image">The pixel data to decode/// </param>/// <param name="hints">The hints to use, clearing the previous state./// </param>/// <returns> The contents of the image/// </returns>/// <throws> ReaderException Any errors which occurred </throws>public Result decode(BinaryBitmap image, System.Collections.Hashtable hints){Hints = hints;return decodeInternal(image);}/// <summary> Decode an image using the state set up by calling setHints() previously. Continuous scan/// clients will get a <b>large</b> speed increase by using this instead of decode()./// /// </summary>/// <param name="image">The pixel data to decode/// </param>/// <returns> The contents of the image/// </returns>/// <throws> ReaderException Any errors which occurred </throws>public Result decodeWithState(BinaryBitmap image){// Make sure to set up the default state so we don't crashif (readers == null){Hints = null;}return decodeInternal(image);}private Result decodeInternal(BinaryBitmap image){int size = readers.Count;for (int i = 0; i < size; i ){Reader reader = (Reader) readers[i];try{return reader.decode(image, hints);}catch (ReaderException re){// continue}}throw ReaderException.Instance;}}}