IOS使用ZxingObjc实现从相册扫描二维码

/* * Copyright 2012 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. */ #import "ZXBarcodeFormat.h" #import "ZXOneDReader.h" typedef enum { ZX_UPC_EAN_PATTERNS_L_PATTERNS = 0, ZX_UPC_EAN_PATTERNS_L_AND_G_PATTERNS } ZX_UPC_EAN_PATTERNS; extern const int ZX_UPC_EAN_START_END_PATTERN_LEN; extern const int ZX_UPC_EAN_START_END_PATTERN[]; extern const int ZX_UPC_EAN_MIDDLE_PATTERN_LEN; extern const int ZX_UPC_EAN_MIDDLE_PATTERN[]; extern const int ZX_UPC_EAN_L_PATTERNS_LEN; extern const int ZX_UPC_EAN_L_PATTERNS_SUB_LEN; extern const int ZX_UPC_EAN_L_PATTERNS[][4]; extern const int ZX_UPC_EAN_L_AND_G_PATTERNS_LEN; extern const int ZX_UPC_EAN_L_AND_G_PATTERNS_SUB_LEN; extern const int ZX_UPC_EAN_L_AND_G_PATTERNS[][4]; @class ZXDecodeHints, ZXEANManufacturerOrgSupport, ZXIntArray, ZXResult, ZXUPCEANExtensionSupport; /** * Encapsulates functionality and implementation that is common to UPC and EAN families * of one-dimensional barcodes. */ @interface ZXUPCEANReader : ZXOneDReader + (NSRange)findStartGuardPattern:(ZXBitArray *)row error:(NSError **)error; /** * Like decodeRow:row:hints:, but allows caller to inform method about where the UPC/EAN start pattern is * found. This allows this to be computed once and reused across many implementations. */ - (ZXResult *)decodeRow:(int)rowNumber row:(ZXBitArray *)row startGuardRange:(NSRange)startGuardRange hints:(ZXDecodeHints *)hints error:(NSError **)error; /** * @return checkStandardUPCEANChecksum: */ - (BOOL)checkChecksum:(NSString *)s error:(NSError **)error; /** * Computes the UPC/EAN checksum on a string of digits, and reports * whether the checksum is correct or not. * * @param s string of digits to check * @return YES iff string of digits passes the UPC/EAN checksum algorithm * @return NO if the string does not contain only digits */ + (BOOL)checkStandardUPCEANChecksum:(NSString *)s; - (NSRange)decodeEnd:(ZXBitArray *)row endStart:(int)endStart error:(NSError **)error; + (NSRange)findGuardPattern:(ZXBitArray *)row rowOffset:(int)rowOffset whiteFirst:(BOOL)whiteFirst pattern:(const int[])pattern patternLen:(int)patternLen error:(NSError **)error; /** * @param row row of black/white values to search * @param rowOffset position to start search * @param whiteFirst if true, indicates that the pattern specifies white/black/white/... * pixel counts, otherwise, it is interpreted as black/white/black/... * @param pattern pattern of counts of number of black and white pixels that are being * searched for as a pattern * @param counters array of counters, as long as pattern, to re-use * @return start/end horizontal offset of guard pattern, as an array of two ints */ + (NSRange)findGuardPattern:(ZXBitArray *)row rowOffset:(int)rowOffset whiteFirst:(BOOL)whiteFirst pattern:(const int[])pattern patternLen:(int)patternLen counters:(ZXIntArray *)counters error:(NSError **)error; /** * Attempts to decode a single UPC/EAN-encoded digit. * * @param row row of black/white values to decode * @param counters the counts of runs of observed black/white/black/... values * @param rowOffset horizontal offset to start decoding from * @param patternType the set of patterns to use to decode -- sometimes different encodings * for the digits 0-9 are used, and this indicates the encodings for 0 to 9 that should * be used * @return horizontal offset of first pixel beyond the decoded digit * @return -1 if digit cannot be decoded */ + (int)decodeDigit:(ZXBitArray *)row counters:(ZXIntArray *)counters rowOffset:(int)rowOffset patternType:(ZX_UPC_EAN_PATTERNS)patternType error:(NSError **)error; /** * Get the format of this decoder. * * @return The 1D format. */ - (ZXBarcodeFormat)barcodeFormat; /** * Subclasses override this to decode the portion of a barcode between the start * and end guard patterns. * * @param row row of black/white values to search * @param startRange start/end offset of start guard pattern * @param result NSMutableString to append decoded chars to * @return horizontal offset of first pixel after the "middle" that was decoded * @return -1 if decoding could not complete successfully */ - (int)decodeMiddle:(ZXBitArray *)row startRange:(NSRange)startRange result:(NSMutableString *)result error:(NSError **)error; @end