Can't import default pyqt6 wheels on windows

[Charles]

At least with PyQt6/PyQt6-Qt6/PyQt6-QtCharts/PyQt6-QtCharts-Qt version
6.6.0, Qt6Charts.dll exports and imports using C calling convention
(__cdecl) instead of C++ convention, causing the error above.

This is visible from this sample of exported names, which start with
underscore:

2617 (0x0a39),  (0x), _ZN25QCandlestickSeriesPrivate16staticMetaObjectE,
0x0011e3b0, Demumble
2618 (0x0a3a),  (0x),
_ZN25QCandlestickSeriesPrivate18handleSeriesChangeEP15QAbstractSeries,
0x000df070, Demumble
2619 (0x0a3b),  (0x),
_ZN25QCandlestickSeriesPrivate18handleSeriesRemoveEP15QAbstractSeries,
0x000df090, Demumble
2620 (0x0a3c),  (0x),
_ZN25QCandlestickSeriesPrivate18initializeGraphicsEP13QGraphicsItem,
0x000ded80, Demumble
2621 (0x0a3d),  (0x),
_ZN25QCandlestickSeriesPrivate18qt_static_metacallEP7QObjectN11QMetaObject4CallEiPPv,
0x000df9c0, Demumble
2622 (0x0a3e),  (0x),
_ZN25QCandlestickSeriesPrivate19createLegendMarkersEP7QLegend, 0x000def10,
Demumble
2623 (0x0a3f),  (0x),
_ZN25QCandlestickSeriesPrivate19updatedCandlesticksEv, 0x000dfe60, Demumble
2624 (0x0a40),  (0x),
_ZN25QCandlestickSeriesPrivate20initializeAnimationsE6QFlagsIN6QChart15AnimationOptionEEiR12QEasingCurve,
0x000dee70, Demumble

You might try replacing Qt6Charts.dll with the one from PySide6.

On Fri, Dec 15, 2023 at 4:57 PM Patrick Stinson <patrickkidd at gmail.com>
wrote:

> I might add that this was done in a virtual environment created by pipenv.
> Looks like it works when using the system installed python.
>
> > On Dec 14, 2023, at 5:41 PM, Patrick Stinson <patrickkidd at gmail.com>
> wrote:
> >
> > I get a DLL linking error with a clean python 3.9.13 install and "pip
> install pyqt6" on windows. This occurs on every machine I try it on in our
> lab, whether windows 10 or windows 11. Installing "pyqt6-tools" gets me
> going for just pyqt6. I am doing a lot of pretty basic stuff so I am not
> tied to a particular pyqt6 or Qt6 version.
> >
> > Now I want to use pyqt6-charts and I am getting the DLL error again:
> "DLL load failed while importing QtCharts: the specified procedure can't be
> found."
> >
> > Are the pyqt6 wheels all really broken? Is it my python version? The
> wheels do include the qt binaries so what is going on? This problem is
> easily reproducible so I thought there might be a straightforward answer
> here.
> >
> > Cheers
> > -Patrick
>
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