16進数と文字列の相互変換

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文字列回転16進

+ (NSString *)hexStringFromString:(NSString *)string {
    NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];
    Byte *bytes = (Byte *)[myD bytes];
    // Byte  16 。
    NSString *hexStr=@"";
    for(int i=0;i

16進数回転文字列

+ (NSString *)stringFromHexString:(NSString *)hexString {
    
    char *myBuffer = (char *)malloc((int)[hexString length] / 2 + 1);
    bzero(myBuffer, [hexString length] / 2 + 1);
    for (int i = 0; i < [hexString length] - 1; i += 2) {
        unsigned int anInt;
        NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)];
        NSScanner * scanner = [[NSScanner alloc] initWithString:hexCharStr];
        [scanner scanHexInt:&anInt];
        myBuffer[i / 2] = (char)anInt;
    }
    NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4];
    NSLog(@"------ =======%@",unicodeString);
    return unicodeString;
}

ここで、16進数文字列をNSDataに変換するコードは次のとおりです.

- (NSData *)convertHexStrToData:(NSString *)str {
    if (!str || [str length] == 0) {
        return nil;
    }
    
    NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8];
    NSRange range;
    if ([str length] % 2 == 0) {
        range = NSMakeRange(0, 2);
    } else {
        range = NSMakeRange(0, 1);
    }
    for (NSInteger i = range.location; i < [str length]; i += 2) {
        unsigned int anInt;
        NSString *hexCharStr = [str substringWithRange:range];
        NSScanner *scanner = [[NSScanner alloc] initWithString:hexCharStr];
        
        [scanner scanHexInt:&anInt];
        NSData *entity = [[NSData alloc] initWithBytes:&anInt length:1];
        [hexData appendData:entity];
        
        range.location += range.length;
        range.length = 2;
    }
    
    LEDEBUG(@"hexdata: %@", hexData);
    return hexData;
}

NSDataを16進数の文字列に変換するには、次のようにします.

- (NSString *)convertDataToHexStr:(NSData *)data {
    if (!data || [data length] == 0) {
        return @"";
    }
    NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];
    
    [data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
        unsigned char *dataBytes = (unsigned char*)bytes;
        for (NSInteger i = 0; i < byteRange.length; i++) {
            NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
            if ([hexStr length] == 2) {
                [string appendString:hexStr];
            } else {
                [string appendFormat:@"0%@", hexStr];
            }
        }
    }];
    
    return string;
}

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文字列回転16進

    class func hexStringFromString(str:String) -> String {
        let data:Data = str.data(using:.utf8)!
        var hexStr = ""
        for i in 0 ..< data.count {
            let mHexStr:NSString = NSString.init(format: "%x", data[i]&0xff)
            if mHexStr.length == 1 {
                hexStr = String(format: "%@0%@", hexStr,mHexStr)
            } else {
                hexStr = String(format: "%@%@", hexStr,mHexStr)
            }
        }
        return hexStr
    }