QString, toLatin1(), data(), concatenated

SPlatten

I have a QJsonDocument:

    QJsonDocument doc(arySetting);

This is converted to Json then to a QByteArray:

    QByteArray baJSON = doc.toJson();

At this point baJSON consists of 831 bytes.

Then I strip out the whitespace and convert to a QString:

    QString strJSON = strStrip(baJSON);

strJSON is 403 bytes long.

I then convert this back to a byte array:

    baJSON = strJSON.toLatin1();

Again, baJSON is 403 bytes long. I then convert this to a const char*:

    const char* cpszJSON = baJSON.data();

Now looking in the debugger cpszJSON contains only 100 bytes.

Whats going on ?

Christian Ehrlicher

@SPlatten said in QString, toLatin1(), data(), concatenated:

Whats going on ?

You're simply looking at the output of gdb which does not output all chars of a char* array (since it can get very long) but only the first 100. So you're testing wrong. Use strlen.

SPlatten

It does appear the at the same point the application is stuck.

Christian Ehrlicher

@SPlatten said in QString, toLatin1(), data(), concatenated:

the application is stuck.

But this for sure does not happen due to the fat the debugger only shows the first 100 bytes of a char* pointer...

SPlatten

It could indicate memory corruption in which case it would.

Christian Ehrlicher

As I already told you it's the debugger which is showing only the first 100bytes and if you don't trust me use strlen() and/or print the string to e.g. stdout.