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  • DATA 转 16 进制

    // 转 16进制 编码

            NSData *data = [NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved];

            Byte *bytes = (Byte *)[data bytes];

            // 下面是Byte 转换为16进制。

            NSString *hexStr = @"";

            for(int i = 0;i < [data length]; i++)

            {

                NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数

                if ([newHexStr length]==1) {

                    hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];

                } else {

                    hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];

                }

            }

            // 转成大写

            for (NSInteger i = 0; i < hexStr.length; i++) {

                if ([hexStr characterAtIndex:i] >= 'a' & [hexStr characterAtIndex:i]<='z') {

                    char temp = [hexStr characterAtIndex:i] - 32;

                    NSRange range = NSMakeRange(i, 1);

                    hexStr = [hexStr stringByReplacingCharactersInRange:range withString:[NSString stringWithFormat:@"%c",temp]];

                }

            }

            NSLog(@"hex = %@",hexStr);

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  • 原文地址:https://www.cnblogs.com/crazygeek/p/6647532.html
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