qt6 migration issue

[JonB]

@Actarus
The error message is complaining on the method definition line, so showing its body is not relevant as it does not get that far. For "Function definition not allowed here" you may have to look back a few lines for context, e.g. (only an example) if previous function not properly terminated with a } it might generate this message. Make sure it marries with the included header declaration too.

[Actarus]

@JonB Thanks Jon, all sorted with } a few lines above.

Can you help in correcting the sintax for QT6 for the following line of QTableWidgetItem:

colorPicker = new QColorDialog(ui->table->item(r, 0)->backgroundColor(), nullptr

I corrected replacing backgroundColor with background, but I can't get the correct sintax.

I still have only 2 last errors to fix, the first is the one above and the last one is this below, for which I can't find anything online:

Thanks

[jsulm]

@Actarus said in qt6 migration issue:

and the last one is this below

This is not the error message.
Please post the real error which is above that line...
It is also better to post error as text not images.

[Actarus]

@jsulm This is what above that line in Compile Output window:

g++ -c -fno-keep-inline-dllexport -g -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_DEPRECATED_WARNINGS -DCHARTDIR_HIDE_OBSOLETE -D_CRT_SECURE_NO_WARNINGS -DQT_PRINTSUPPORT_LIB -DQT_QUICKWIDGETS_LIB -DQT_WIDGETS_LIB -DQT_QUICK_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE5COMPAT_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QMLINTEGRATION_LIB -DQT_BLUETOOTH_LIB -DQT_NETWORK_LIB -DQT_SQL_LIB -DQT_SERIALPORT_LIB -DQT_POSITIONING_LIB -DQT_XML_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../Test -I. -I../Test/Charts -I../Test/Charts/Tables -I../Test/Charts/JSONObjects -I../Test/Archivio -I../Test/Comp -I../Test/Parse -I../Test/Bluetooth -I../Test/MD5 -I../Test/Devs -I../Test/Devs/DevicesFactory -I../Test/Conf -I../Test/Usb -I../Test/Triggers -I../Test/SubClass -I../Test/Server -I../Test/Exporter -I../Test/Wifi -IC:/Projects/QT_Project/Test/ZipPack/include -IC:/Projects/QT_Project/Test/LimeReport/Release/include -I../include -I../../../Qt/6.5.0/mingw_64/include -I../../../Qt/6.5.0/mingw_64/include/QtPrintSupport -I../../../Qt/6.5.0/mingw_64/include/QtQuickWidgets -I../../../Qt/6.5.0/mingw_64/include/QtWidgets -I../../../Qt/6.5.0/mingw_64/include/QtQuick -I../../../Qt/6.5.0/mingw_64/include/QtOpenGL -I../../../Qt/6.5.0/mingw_64/include/QtGui -I../../../Qt/6.5.0/mingw_64/include/QtCore5Compat -I../../../Qt/6.5.0/mingw_64/include/QtQmlModels -I../../../Qt/6.5.0/mingw_64/include/QtQml -I../../../Qt/6.5.0/mingw_64/include/QtQmlIntegration -I../../../Qt/6.5.0/mingw_64/include/QtBluetooth -I../../../Qt/6.5.0/mingw_64/include/QtNetwork -I../../../Qt/6.5.0/mingw_64/include/QtSql -I../../../Qt/6.5.0/mingw_64/include/QtSerialPort -I../../../Qt/6.5.0/mingw_64/include/QtPositioning -I../../../Qt/6.5.0/mingw_64/include/QtXml -I../../../Qt/6.5.0/mingw_64/include/QtCore -Idebug -I. -I/include -I../../../Qt/6.5.0/mingw_64/mkspecs/win32-g++ -o debug\chartmappa.o ..\Test\Charts\chartmappa.cpp
mingw32-make[1]: *** [Makefile.Debug:32897: debug/colorrange.o] Error 1

[JonB]

@Actarus said in qt6 migration issue:

debug/colorrange.o] Error 1

Strange, because that colorrage.o file is not even mentioned on the previous line, which may have been completed successfully. make may be moving on to build the next file alphabetically. Errno 1 would be "EPERM". Does debug/colorrange.o already exist? Are you able to delete it?

[Actarus]

@JonB No, it doesn't exist at all.

[Actarus]

@JonB Can it be related to the error message on the top of the editor window?
Stating:
Error:Could not decode "colorrange.cpp" with "UTF-8"-encoding. Editing not possible.

[JonB]

@Actarus
That's not good! There would appear to be a problem if editor says the .cpp is not editable I would be worried :) Which may lead to a problem when trying to compile it to the .o file....

[Actarus]

@JonB I've just checked and I have the same message on the other PC with QT5 but, in that case, it compiles without errors and I can find the colorrange.o file in the debug folder.

[Actarus]

@JonB Jon, just opened it with text editor and saved it in UTF-8, the encoding error disappeared but the Error 1 is still present.

[JonB]

@Actarus
I would delete the debug folder and do a full, clean rebuild from scratch. If it errors look carefully at the compile output, because what you show seems "strange".

[Actarus]

@JonB Did it but it didn't change, but the colorrange.cpp file is "casually" the same where I have the error mentioned above about backgroundcolor that is the last one code issue that had not yet been corrected.

Could you please give me a tip about it and maybe it fixes also the Error1?

"Can you help in correcting the sintax for QT6 for the following line of QTableWidgetItem:

colorPicker = new QColorDialog(ui->table->item(r, 0)->backgroundColor(), nullptr

I corrected replacing backgroundColor with background, but I can't get the correct sintax."

Thanks.

[JonB]

@Actarus
The line you show simply seems to be missing the trailing );. Other than that I don't think it has changed from Qt5. If you get an error copy & paste exactly what the compiler shows you about it.

[Actarus]

@JonB Sorry, just didn't pasted here the ); but it's in the code.
Actually in QT6 it's no longer possible to use 'backgroundColor', indeed I replaced it with 'background' in all the other situations where I had the same error message and it worked.

The error text is the following:

error: 'class QTableWidgetItem' has no member named 'backgroundColor'; did you mean 'background'?
307 | colorPicker = new QColorDialog(ui->table->item(r, 0)->backgroundColor(), nullptr/ui->table/);
| ^~~~~~~~~~~~~~~
| background

But replacing it with 'background', then I get the message :

colorrange.cpp:307:27: No matching constructor for initialization of 'QColorDialog'
qcolordialog.h:36:14: candidate constructor not viable: no known conversion from 'QBrush' to 'const QColor' for 1st argument
qcolordialog.h:35:14: candidate constructor not viable: allows at most single argument 'parent', but 2 arguments were provided
:74:20: note: candidate constructor not viable: requires 1 argument, but 2 were provided

[Actarus]

@JonB Jon, fixed both with the correct sintax:

colorPicker = new QColorDialog(ui->table->item(r, 0)->background().color(), nullptr);

This also fixed the error1 and now the .o file is generated

[Actarus]

@JonB Jon, now that I fixed all the errors, if I compile I suddenly get around 1600 errors like the following one but in QT5 it has always compiled and run perfectly.

error: conversion from 'const char [2]' to 'QChar' is ambiguous
: conversion from 'const char [2]' to 'QChar' is ambiguous
933 | if(formula.at(i) == "'" && i+1 < formula.length())
| ^~~

Invalid operands to binary expression ('const QChar' and 'const char[2]')
qchar.h:582:34: candidate function not viable: no known conversion from 'const char[2]' to 'QChar' for 2nd argument

Here the code:

QString can;
                                            for(int i = 0; i < formula.size(); i++)
                                            {
                                                if(formula.at(i) == "'" && i+1 < formula.length())
                                                {
                                                    i += 1;
                                                    while(i < formula.length() && formula.at(i) != "'")
                                                    {
                                                        can.append(formula.at(i));
                                                        i += 1;
                                                    }
                                                    if(cBoxChannel_1->findText(can) != -1)
                                                    {
                                                        nChannels += 1;
                                                        if(nChannels == 1)
                                                            cBoxChannel_1->setCurrentIndex(cBoxChannel_1->findText(can));
                                                        else
                                                            if(nChannels == 2)
                                                                cBoxChannel_2->setCurrentIndex(cBoxChannel_2->findText(can));
                                                            else
                                                                if(nChannels == 3)
                                                                    cBoxChannel_3->setCurrentIndex(cBoxChannel_3->findText(can));
                                                                else
                                                                    if(nChannels == 4)
                                                                        cBoxChannel_4->setCurrentIndex(cBoxChannel_4->findText(can));
                                                                    else
                                                                        if(nChannels == 5)
                                                                            cBoxChannel_5->setCurrentIndex(cBoxChannel_5->findText(can));
                                                                        else
                                                                            if(nChannels == 6)
                                                                                cBoxChannel_6->setCurrentIndex(cBoxChannel_6->findText(can));
                                                                            else
                                                                                if(nChannels == 7)
                                                                                    cBoxChannel_7->setCurrentIndex(cBoxChannel_7->findText(can));
                                                                                else
                                                                                    if(nChannels == 8)
                                                                                        cBoxChannel_8->setCurrentIndex(cBoxChannel_8->findText(can));
                                                    }
                                                    can.clear();
                                                }
                                            }

The claimed part is the ==:

if(formula.at(i) == "'" && i+1 < formula.length())

[Christian Ehrlicher]

error: conversion from 'const char [2]' to 'QChar' is ambiguous
: conversion from 'const char [2]' to 'QChar' is ambiguous

We already discussed this problem ...

[Actarus]

@Christian-Ehrlicher Thanks, fixed.

I'm facing a couple of situations that in QT5 compile without problem but not in QT6:

connect(xychart->m_ChartViewer, &QChartViewer::needTrackLineXYChart, this, &AnalysisWindow::trackLineAxis);

and

connect(m_ChartViewer, &QChartViewer::MouseIsPressed, this, &BaseViewPortComp::mousePressEvent);

In both cases the problem is error:
static assertion failed: Signal and slot arguments are not compatible.
214 | static_assert((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),

I assume it's because it's not possible to connect a QPointerEvent to a QMouseEvent, but how to get out of this?

[Christian Ehrlicher]

Qt has no class named QChartViewer so I don't know this class. Most likely the signature of the signals changed so you have to adjust your slots accordingly - normal developer stuff.

[Actarus]

@Christian-Ehrlicher Thanks Christian, fixed adjusting slots.