Re: [RAUC] D-Bus control Qt

[Bastian Krause <bst@pengutronix.de>]

Hi,

On 8/2/21 8:15 AM, Stahl, Michael wrote:
> Is there someone who implemented the DBus Property "Progress" into a
> Qt-Application? The problem seems the return value isi (Integer, String,
> Integer). 
> For all other properties with a single return value like "Operation" or
> "LastError" the Qt DBus API works fine. 
> I found an email from 28.Oct 2019 in the mailing list where Bastian
> Krause had the same issue. The answer was only that he had to cunsult
> the Qt DBus documentation on how a tuple is mapped to Qt types.

I just answered the mail by Steffen Wolk back then.

> Thats a good hint but after hours of searching the web I didn't find a
> solution. The return value for a property is QVariant in Qt. 
> 
> Trial 1 -> Read value by iface.property("Progress"):
> This is the error message I got when I try to read the progress property:
> Cannot construct placeholder type QDBusRawType
> 
> Trial 2 -> Read value by iface.call("Get",...):
> Not able to get any information. The arguments of the returned
> QDBusMessages are always empty!

I don't have any experience here. Maybe Steffen Wolk (in cc) can share
how his solution looks like?

Regards,
Bastian

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