Bytes help again D:

[Niunzin]

Hi, i'm new in qt and i don't know how to send bytes D:

I want to follow this protocol:
C: 04
CC: 04
Name: THREAD_REPLY
Format (Sent): thread_id (int), message [short, string]

I tried it, but doesnt worked:

QByteArray reply;
    reply[0] = 0x00;
    reply[1] = 0x00;
    reply[2] = 0x00;
    reply[3] = 0x2f;
    reply[4] = 0x04;
    reply[5] = 0x04;
    reply[6] = 0x00;
    reply[7] = 572436;
    reply[8] = 0x00;
    reply[9] = 0x00;
    reply[10] = 0x00;
    reply[11] = ui->lineEdit->text().toUtf8();
 
    sendPacket(reply);

QByteArray reply;
    reply[0] = 0x00;
    reply[1] = 0x00;
    reply[2] = 0x00;
    reply[3] = 0x2f;
    reply[4] = 0x04;
    reply[5] = 0x04;
    reply[6] = 0x00;
    reply[7] = 572436;
    reply[8] = 0x00;
    reply[9] = 0x00;
    reply[10] = 0x00;
    reply[11] = ui->lineEdit->text().toUtf8();

    sendPacket(reply);

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Thanks!

[ChrisW67]

What about it doesn't work? We are not mind readers.

Some general observations:

• If the packet is supposed to be a four byte int (assumed) followed by a two byte short indicating the length of the following string then the list of bytes you have there is too long.
• Multi byte integers are sensitive to byte order issues. Make sure sender and receiver agree.
• Line 9 makes no sense. You cannot put that number in a single byte.
• Line 11 tries to put an entire string in a single byte. Did you perhaps intend to append the string?

[Niunzin]

I need to convert an String to Hex (like J -> 6a) and add it to the byte array D:

[zaphod.b]

Have a look at QByteArray::toHex().

[ChrisW67]

No, you want to append the bytes of the string to the bytes already in the array. You are part way there with QString::toUtf8() (which gives you an eight-bit encoded string in a byte array) but you want to use QByteArray::append() or QByteArray::operator+().