how to read hex data stream

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C++

Hello
I have a pulse oximetry device which communicate via bluetooth
my c++ program can connect it via COM3, and tries to retrieve its data(pulse rate and oxygen sat.)
but the data format of device is confused. here is the remark of data format:

The 9560 includes 6 bytes of header information, a minimum of 14 bytes of spot-check data, and 2 bytes of footer information.

To determine the total length for the expandable Spot-check data, the host must capture the data length from bytes 5 and 6 of the header.

With the minimum data length of 14, the data length defined in bytes 5 and 6 will be
(0x00) (0x0E) (14 bytes decimal).

The Spot-check data consists of – time of spot-check, SpO2, Pulse Rate, and status.

            Byte#  Data               Information                        Format
            1       00                 NULL start                         Hex
            2       02                 STX – start of pocket               Hex
Header      3       00                 Packet type MSB                    Hex
            4       0D                 Packet type LSB                    Hex
            5       00                 *Data Length MSB (variable)        Hex
            6       0E                 *Data Length LSB (variable)        Hex

            7       20                 Hundredths place of Year           BCD
            8  Year of Measurement     Year of Measurement                BCD
            9  Month of Measurement    Month of Measurement               BCD
            10 Day of Measurement      Day of Measurement                 BCD
            11 Hour of Measurement     Hour of Measurement (00-23)        BCD
expandable  12 Minute of Measurement   Minute of Measurement (00-59)      BCD
Spot-check  13 Second of Measurement   Second of Measurement (00-59)      BCD
data        14 00                      Fraction of second                 BCD
            15 STATUS MSB              See STATUS specification below     Hex
            16 STATUS LSB              See STATUS specification below     Hex
            17 Pulse Rate MSB          See HR format below                Hex
            18 Pulse Rate LSB          See HR format below                Hex
            19 00 to FF                Reserved for future use            Hex
            20 SpO2                    See SpO2 format below              Hex

footer      21 Checksum LSB           LSB of sum Footer of Spot-check Data    Hex
            22 03                     ETX – end of transmission             Hex

part of my code:

        char buf[22];

DWORD read = 0;


if (ReadFile(comport,&buf,22,&read,NULL)){

    DWORD i;

    for(i=0;i<read;i++){
        printf(" %d\n", (unsigned char)buf[i]);
    }
    printf("\n");

}else {printf("cannot read...");}

I get output like this:
1 128 112 0 241 1 128 112 98 83 1 128 111 147 131 1 128 111 0 240 1 128

Could you please help me how to read and print data in correct format
thanks

i open the port with:

if ((comport = CreateFile("\\\\.\\COM3",                // open com3:
                GENERIC_READ | GENERIC_WRITE, // for reading and writing
                0,                            // exclusive access
                NULL,                         // no security attributes
                OPEN_EXISTING,
                0,
                0)) == INVALID_HANDLE_VALUE)
{
    printf("cannot open the port\n");
}