QByteArray from hex literal unicode characters - qt

Question

I see how a QByteArray to convert to and from Ascii character
I see how to convert a QString to utf-8 using QString::toUtf8()
However, I do not see how to initialize a QByteArray with hex literals containing unicode characters. The unicode characters are too large to fit into a char. They will however fit into an unsigned char.
If I run the following code:
QString test = "¢";
QByteArray utf8bytes = test.toUtf8();
My debugger says:
utf8bytes = { (char)-62 '\302', (char)-94 '\242' }
Whatever that means...
What I ultimately want to accomplish is to be able to provide test data in the following unit test code:
void stomp_frame_tests::test_nonAsciiCharactersInHeaderKey()
{
/* Frame we are testing with:
SEND
Bad¢Character:Erroneus
destination:/queue/a
content-type:text/json;charset=utf-8
content-length:22
This is a test message
*/
const char data[] = {0x53, 0x45, 0x4e, 0x44, 0x0a, 0x42, 0x61, 0x64, 0xc2, 0xa2, 0x43, 0x68, 0x61, 0x72, 0x61,
0x63, 0x74, 0x65, 0x72, 0x3a, 0x45, 0x72, 0x72, 0x6f, 0x6e, 0x65, 0x75, 0x73, 0x0a, 0x64,
0x65, 0x73, 0x74, 0x69, 0x6e, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x2f, 0x71, 0x75, 0x65,
0x75, 0x65, 0x2f, 0x61, 0x0a, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x74, 0x79,
0x70, 0x65, 0x3a, 0x74, 0x65, 0x78, 0x74, 0x2f, 0x6a, 0x73, 0x6f, 0x6e, 0x3b, 0x63, 0x68,
0x61, 0x72, 0x73, 0x65, 0x74, 0x3d, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x0a, 0x63, 0x6f, 0x6e,
0x74, 0x65, 0x6e, 0x74, 0x2d, 0x6c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x3a, 0x32, 0x32, 0x0a,
0x0a, 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x61, 0x20, 0x74, 0x65, 0x73, 0x74,
0x20, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x00};
auto testData = QByteArray::fromRawData(data, sizeof(data));
}
This fails, of course, because 0xc2 and 0xa2 are too large to fit into a char. How would you go about initializing the QByteArray with the appropriate data?

Answer 1

Use QByteArray::fromHex instead:
auto testData = QByteArray::fromHex("C2A2");
Document:
https://doc.qt.io/qt-5/qbytearray.html#fromHex

Answer 2

Perhaps you are looking for QByteArrayLiteral:
auto byteArray = QByteArrayLiteral("\x01\x02\x03\x04\x05");
QByteArrayLiteral Documentation