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);