Qt QString add null terminator

[ConductedForce]

How do you add a null terminator at the end of a QString? I'm sending data across the network and the receiving device expects one.

[JKSH]

Hi, and welcome!

@ConductedForce said in Qt QString add null terminator:

How do you add a null terminator at the end of a QString? I'm sending data across the network and the receiving device expects one.

In ASCII, the null-terminator is the null character, 0x00. It is represented as the '\0' literal in C/C++.

Note: Technically, you send a byte array across the network; you don't send a text string.

First, convert your QString to a QByteArray. Then, append a '\0' character to the end of the byte array. Then, send your byte array.

[JonB]

@JKSH
Since this topic is marked as solved now anyway, I feel like observing:

First, convert your QString to a QByteArray. Then, append a '\0' character to the end of the byte array. Then, send your byte array.

Actually, according to me, you could skip appending that \0 character. When you have a QByteArray, QByteArray::data() is (surprisingly) always NUL-terminated, with the \0 being an additional character at the end (https://doc.qt.io/qt-5/qbytearray.html#data)! So, you can actually send QByteArray::size() + 1 bytes from data() and save on extending the byte array :)

[JKSH]

@JonB said in Qt QString add null terminator:

you could skip appending that \0 character. When you have a QByteArray, QByteArray::data() is (surprisingly) always NUL-terminated, with the \0 being an additional character at the end (https://doc.qt.io/qt-5/qbytearray.html#data)! So, you can actually send QByteArray::size() + 1 bytes from data() and save on extending the byte array :)

Good catch!