convert string to hex

veysel.olgun

hello, how can i convert QString to hex this is part of my code :

QString a=ui->lineEdit->text();

if a=="ffaabbccdd" is working fine but
if a=="veyselolgun" it is not work correctly

can anyone help me

Mark81

Your code just assigns to a variable the content of your QLineEdit. It's not clear what do you mean with "convert to hex". Hex it just a presentation format, not the number itself. If you have an hex string (like "ffaabbccdd") you can convert it to a number:

QString a = "ffaabbccdd";
qDebug() << a.toLongLong(nullptr, 16);
// output: 1098081094877

and of course it won't work with "veyselolgun" because it's not a valid hex string.

veysel.olgun

@Mark81 said in convert string to hex:

a.toLongLong(nullptr, 16);

i want to send to card reader when i entry to Qlineedit veyselolgun data, and i want to receive this data veyselolgun from card reader

for example when i entry to Qlineedit aabbccddeeff data, it sending to card reader and i am receiving response that is aabbccddeeff from card reader

i hope i express what i want to do
thank you

SGaist

Hi,

What exactly is your card reader expecting ?

veysel.olgun

Example: write to block 40: “00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F” //this is what i send but i want to send for example "hello world" or "data was written"

Successful operation:

REQUEST : HOST->READER: 02 1B 00 3E DF 78 12 A6 28 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 1C 03

ACKOWLEDGE : READER->HOST: 02 08 00 3E 00 00 34 03
RESPONSE : READER->HOST: 02 0D 00 3E FF 01 04 DF 78 01 A6 CB 03

veysel.olgun

when i want to read block of 40 i have to show that :

Example: read block 40 (0x28)

Successful read of “00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F”:

REQUEST : HOST->READER: 02 0B 00 3E DF 78 02 A5 28 1F 03

ACK : READER->HOST: 02 08 00 3E 00 00 34 03

RESPONSE : READER->HOST: 02 1D 00 3E FF 01 14 DF 78 11 A5 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F D8 03 //if i write hello worldworld i have to read that :

02 1D 00 3E FF 01 14 DF 78 11 A5 hello worldworld D8 03 of course D8 03 will be changed

SGaist

Can you provide a link to the protocol you should use with that reader ?

veysel.olgun

This post is deleted!

veysel.olgun

can you send me your email adress from private message because there is no it on website, i have a pdf sorry i am late to reply because i have no reputation

jsulm

@veysel.olgun Don't ask others for their email address!
You can upload the document to some sharing service (drop box for example) and post the link here.

veysel.olgun

sorry for that, i will load dropbox

veysel.olgun

https://www.dropbox.com/s/xb5uus6j8cu8juf/HOST-READER PROTOCOL v1.8. 15.03.2016 .pdf?dl=0

page number 14-17

thank you

veysel.olgun

hello i solved the problem thank you all

SGaist

What was it ?

veysel.olgun

it is about send to text data selected block and after take the text data selected block, actually if i show it it will be more understandable. i know it is easy to do but i was forced while converting.

(https://ddgobkiprc33d.cloudfront.net/2ff2c1a2-d1bd-4501-8519-8b81632ac359.png) i know ui is not good for now