How to output QList to standard console ?

[Chrisw01]

Have you tried something like this?

for(int loop1 = 0; loop1 < BT_string_list.size(); loop1++) {
    cout << BT_string_list.at(loop1);
}

[Pablo J. Rogina]

@AnneRanch said in How to output QList to standard console ?:

I cannot figure out how to retrieve / print the actual names of the devices to console.

What about QBluetoothHostInfo::name():

Returns the user visible name of the host info object.

[Anonymous_Banned275]

@Chrisw01

That is the problem - I get this error
and I do not know how to implement the correct operator <<
because QBluetoothHostInfo in not a QString .

/media/z/DOC_COPY_LABEL/Projects /QT_TEST/TEST_Splitter/application_Form_1/application/mainwindow_form.cpp:97: error: no match for 'operator<<' (operand types are 'std::ostream {aka std::basic_ostream<char>}' and 'const QBluetoothHostInfo')
cout << BT_string_list.at(loop1);
^

[JonB]

@AnneRanch
The object you have there is a whole QBluetoothHostInfo. The error message tells you the << operator hasn't been written to cope with that. You can't convert a whole QBluetoothHostInfo to a QString. @Pablo-J-Rogina is suggesting you output a QBluetoothHostInfo::name(), just the name of it. So presumably

cout << BT_string_list.at(loop1).name();

[Chrisw01]

@AnneRanch My bad, try BT_string_list.at(loop1).name();

[Anonymous_Banned275]

@JonB

Sorry, still no good.

Here is the code

  cout << BT_string_list.at(loop1).name(); 

won't even compile

  qDebug ("DEBUG  message %d, says: %s",
          BT_string_list.size(),BT_string_list.at(loop1).name());

runs but "prints" garbage

And error
/media/z/DOC_COPY_LABEL/Projects /QT_TEST/TEST_Splitter/application_Form_1/application/mainwindow_form.cpp:134: error: no match for 'operator<<' (operand types are 'std::ostream {aka std::basic_ostream<char>}' and 'QString')
cout << BT_string_list.at(loop1).name();
^

Same issue
the BT_string_list.at(loop returns "item" ( per doc ) and I have no clue what is "item" .

The .name() , assuming it is a one of the items should return QString .
Neither qDebug or "loop ..." see a QString - that is the issue.

In simple terms - I need to convert whatever type ins "item" to QString to be able to send it to console. I am open to options, but woudl like to stick with C++ std::cout . This QString intead of C++ "String" is making things unnecessary complicated to code in Qt.

[Pablo J. Rogina]

@AnneRanch said in How to output QList to standard console ?:

the BT_string_list.at(loop returns "item" ( per doc ) and I have no clue what is "item" .

Wow, it's something you defined yourself...

QList<QBluetoothHostInfo> BT_string_list;

so "item" will be an object of class ___________ (please fill in the blanks)

[J.Hilk]

@AnneRanch
std::cout knows nothing of QString, by default at least, but it can print std::strings

therefore:

cout << BT_string_list.at(loop1).name().toStdString(); 

[VRonin]

https://doc.qt.io/qt-5/qtglobal.html#qPrintable

[JonB]

@AnneRanch said in How to output QList to standard console ?:

qDebug ("DEBUG message %d, says: %s", BT_string_list.size(),BT_string_list.at(loop1).name());

runs but "prints" garbage

That's because you have not looked up the syntax or examples of qDebug(). Always use the (excellent) documentation! Look at https://doc.qt.io/qt-5/qdebug.html. See how it always uses the << operator? So

qDebug() << "DEBUG  message " << BT_string_list.size() << ", says: " << BT_string_list.at(loop1).name();

[Anonymous_Banned275]

This post is deleted!