NSString轉16進制 NSString轉NSData Byte數組 轉換成NSString byte數組 轉換成NSString

// NSString 轉 16進制

- (NSString *) dataToHexString

{

    NSUInteger len = [selflength];

    char * chars = (char *)[selfbytes];

    NSMutableString * hexString = [[NSMutableStringalloc] init];

    

    for(NSUInteger i =0; i < len; i++ )

        [hexString appendString:[NSStringstringWithFormat:@"%0.2hhx", chars[i]]];

    

    return hexString;

}

// NSString 轉 NSData

- (NSData *) stringToHexData

{

    int len = (int)[selflength] / 2;// Target length

    unsigned char *buf =malloc(len);

    unsigned char *whole_byte = buf;

    char byte_chars[3] = {'\0','\0','\0'};

    

    int i;

    for (i=0; i < [selflength] / 2; i++) {

        byte_chars[0] = [selfcharacterAtIndex:i*2];

        byte_chars[1] = [selfcharacterAtIndex:i*2+1];

        *whole_byte = strtol(byte_chars, NULL, 16);

        whole_byte++;

    }

    

    NSData *data = [NSDatadataWithBytes:buf length:len];

    free( buf );

    return data;

}

//byte數組 轉換成NSString

-(NSString *) parseByteArray2HexString:(Byte[]) bytes

{

    NSMutableString *hexStr = [[NSMutableString alloc]init];

    int i = 0;

    if(bytes)

    {

        while (bytes[i] != '\0')

        {

            NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16進制數

            if([hexByte length]==1)

                [hexStr appendFormat:@"0%@", hexByte];

            else

                [hexStr appendFormat:@"%@", hexByte];

            

            i++;

        }

    }

    return hexStr;

}

// NSString 轉 NSData

-(NSData*) hexToBytes:(NSString *) string {

    NSMutableData *data = [NSMutableData data];

    int idx;

    for (idx = 0; idx+2 <= string.length; idx+=2) {

        NSRange range = NSMakeRange(idx, 2);

        NSString* hexStr = [string substringWithRange:range];

        NSScanner* scanner = [NSScanner scannerWithString:hexStr];

        unsigned int intValue;

        [scanner scanHexInt:&intValue];

        [data appendBytes:&intValue length:1];

    }

    return data;

}

//NSData 轉 NSString

-(NSString *) hexToBytes:(NSData *) KeyData {

    NSString *hexStr=@"";

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

    {

        NSString *newHexStr = [NSString stringWithFormat:@"%x",mimabyte[i]&0xff];///16進制數

        if([newHexStr length]==1)

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

        else

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

    }

    return hexStr;

}