[Qt-interest] [QtDBUS] Getting properties

[Georg Grabler]

Hi guys and girls,

I'm lacking a bit the documentation for QtDbus (or working examples), that's
why I decided to ask here.

I'm trying to get the org.freedesktop.UDisks "KnownFilesystems" hash back
using a QDBusInterface.

Example code:

QDBusInterface fsif("org.freedesktop.UDisks",
"/org/freedesktop/UDisks", "org.freedesktop.UDisks",
QDBusConnection::systemBus());

QVariant fsreply = fsif.property("KnownFilesystems");

 qDebug() << fsreply;

qDebug() << fsif.lastError();


Now, I realized I get nothing at all back:


QVariant(, )

QDBusError("", "")


If i use qdbusviewer, I get the following construct of this property,
which makes me believe it should actually work:

  Arguments: [Variant: [Argument: a(ssbbbubbbbbbbb) {[Argument:
(ssbbbubbbbbbbb) "vfat", "FAT", false, true, true, 254, true, false,
true, false, false, false, false, false], [Argument: (ssbbbubbbbbbbb)
"ext2", "Linux Ext2", true, true, true, 16, true, true, true, false,
true, true, true, true], [Argument: (ssbbbubbbbbbbb) "ext3", "Linux
Ext3", true, true, true, 16, true, true, true, false, true, true,
true, true], [Argument: (ssbbbubbbbbbbb) "ext4", "Linux Ext4", true,
true, true, 16, true, true, true, false, true, true, true, true],
[Argument: (ssbbbubbbbbbbb) "btrfs", "BTRFS", true, true, true, 256,
false, false, true, false, true, true, true, true], [Argument:
(ssbbbubbbbbbbb) "xfs", "XFS", true, true, true, 12, true, false,
true, false, false, true, false, false], [Argument: (ssbbbubbbbbbbb)
"reiserfs", "ReiserFS", true, true, true, 16, true, false, true,
false, true, true, true, false], [Argument: (ssbbbubbbbbbbb) "minix",
"Minix", true, true, true, 0, false, false, true, false, false, false,
false, false], [Argument: (ssbbbubbbbbbbb) "ntfs", "NTFS", false,
true, true, 128, true, false, false, false, true, false, true, false],
[Argument: (ssbbbubbbbbbbb) "nilfs2", "NILFS2", true, true, true, 80,
true, false, false, false, false, false, false, false], [Argument:
(ssbbbubbbbbbbb) "swap", "Swap Space", false, false, true, 15, false,
false, false, false, false, false, false, false]}]]


Now, having said that, calling "simple" functions returning in example
a bool value works just fine:

QDBusInterface fsif("org.freedesktop.UDisks",
"/org/freedesktop/UDisks", "org.freedesktop.UDisks",
QDBusConnection::systemBus());

QVariant fsreply = fsif.property("DaemonVersion");

qDebug() << fsreply;

qDebug() << fsif.lastError();


Which makes me believe it has something to do with the complex data
structure being returned - or some other mistake. I wanted to look in
the code examples (ping-pong etc.), but sadly, the .cpp and .h files
were missing in the Qt distribution (probably a mistake by my
distribution?).


Can anyone point me in a direction to examples / documentation which
could bring me a step closer to what I want, or provide me with help
here?


Best regards,

Georg
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