addAttribute() doesn't work

[trapanator]

Hi, I wrote a python plugin that does a:

feat = QgsFeature()
[...]
x = 0
y = "hello"
feat.addAttribute (x, QString(y))

In Windows it works well, but in Ubuntu Jaunty (and QGIS 1.4.0) it gives this error:

TypeError: argument 2 of QgsFeature.addAttribute() has an invalid type

[trapanator]

note: I tried to remove QString(), same result.

[trapanator]

err... I mispelled the title: s/addFeature/addAttribute/ :-(

[wonder]

addAttribute() method expects QVariant instance, not QString. So this should work:

feat.addAttribute (x, QVariant(y))

The difference in behaviour is probably due different SIP/PyQt4 versions on your systems: one might support automatic conversion from QString to QVariant, while the other doesn't.

[trapanator]

Ok. Using QVariant fixes the problem. Thank you to all.

[trapanator]

Ubuntu Karmic has QT 4.5.2, while Jaunty 4.5.0.

With Karmic QVariant is optional, while Jaunty is mandatory.