<![CDATA[Parsing a hexadecimal data and calculating checksum]]>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?

]]>https://forum.qt.io/topic/142623/parsing-a-hexadecimal-data-and-calculating-checksumRSS for NodeFri, 05 Jun 2026 21:44:40 GMTThu, 02 Feb 2023 07:48:10 GMT60<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 10:14:40 GMT]]>@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.

]]>https://forum.qt.io/post/745987https://forum.qt.io/post/745987Thu, 02 Feb 2023 10:14:40 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 08:52:37 GMT]]>@jsulm nope, it just exists when the size doesn't match

auto count = bytes.size();
if (count == 0 || count > 4) {
return 0;
}
]]>https://forum.qt.io/post/745981https://forum.qt.io/post/745981Thu, 02 Feb 2023 08:52:37 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 08:51:56 GMT]]>@J-Hilk I think byteArrayToUint32 is supposed to do that?

]]>https://forum.qt.io/post/745980https://forum.qt.io/post/745980Thu, 02 Feb 2023 08:51:56 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 08:28:54 GMT]]>@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?"

]]>https://forum.qt.io/post/745975https://forum.qt.io/post/745975Thu, 02 Feb 2023 08:28:54 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 08:23:44 GMT]]>@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.

]]>https://forum.qt.io/post/745973https://forum.qt.io/post/745973Thu, 02 Feb 2023 08:23:44 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 07:51:29 GMT]]>@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...

]]>https://forum.qt.io/post/745967https://forum.qt.io/post/745967Thu, 02 Feb 2023 07:51:29 GMT<![CDATA[Reply to Parsing a hexadecimal data and calculating checksum on Thu, 02 Feb 2023 07:50:49 GMT]]>@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.

]]>https://forum.qt.io/post/745966https://forum.qt.io/post/745966Thu, 02 Feb 2023 07:50:49 GMT