Parsing a hexadecimal data and calculating checksum

[Rumeysa_135]

Hello, I want to first parse a hexadecimal data coming from a device, then calculate the checksum, convert the data to decimal and print it on my screen.
How can ı do that?

[jsulm]

@Rumeysa_135 Use https://doc.qt.io/qt-6/qstring.html#toInt to convert a string containing a hex number to an integer.
Don't know what kind of checksum you need.
"print it on my screen" - can be done using many widgets like QWidget, QTextEdit, ... - depends on how you want to show the data.

[jsulm]

@Rumeysa_135 How is this thread different to your older one: https://forum.qt.io/topic/142574/how-do-i-parse-string-arrays-in-qt ?
You already got some answers there...

[Rumeysa_135]

This post is deleted!

[jsulm]

@Rumeysa_135 said in Parsing a hexadecimal data and calculating checksum:

How can I integrate these two codes together?

I don't understand the question.
What do you mean with "integrate"?
Simply call the code where needed.

[J.Hilk]

@jsulm said in Parsing a hexadecimal data and calculating checksum:

I don't understand the question.

I think the OP's question is: "How do I take only 4 Bytes from my QByteArray, so that I can convert it into an int32?"

[jsulm]

@J-Hilk I think byteArrayToUint32 is supposed to do that?

[J.Hilk]

@jsulm nope, it just exists when the size doesn't match

auto count = bytes.size();
if (count == 0 || count > 4) {
return 0;
}

[JonB]

@J-Hilk said in Parsing a hexadecimal data and calculating checksum:

I think the OP's question is: "How do I take only 4 Bytes from my QByteArray, so that I can convert it into an int32?"

@jsulm nope, it just exists when the size doesn't match

So if you want to access 4 bytes (sizeof(int32)) for conversion use QByteArray QByteArray::mid(qsizetype pos, qsizetype len = -1) const. Otherwise if you want it to appear as an array of int32 (and you know byte ordering is correct) use reinterpret_cast<> to int array on the data.