how can 20 Bytes be put into a string[20] in Qt and then be sent by a serial port

[Alex22]

Hi
I have two questions. I need first to put 20 bytes into a string[20]. In C++ i did that by this code:

string[0]='ab'; //ab is in Hex (0xab)
string[1]='50'; //50 is in Hex (0x50)
.
.
.
string[19]='54' //54 is in Hex

string[0]='ab'; //ab is in Hex (0xab)
string[1]='50'; //50 is in Hex (0x50)
.
.
.
string[19]='54' //54 is in Hex

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After filling string[20], i must send it by serial port.
My first question is: how could i write above code in Qt to send by a serialport?
and my second question is: can i use QByteArray and then use QSerialPort::write(QByteArray)?