passing tuple with pyqt4 signal/slot mechanism

[Pradnyesh Sawant]

Hello,
I have a pyqt4 code in which i'm trying the signal/slot mechanism. The
(stripped) code is as follows:

class D(QtCore.QThrea d):
def __init__(self):
QtCore.QThread. __init__(self)
tpl = ("Primary", "priSec")
print "tpl:", tpl
self.emit(QtCor e.SIGNAL("setLa bel"), tpl)
class Gui(QtGui.QDial og):
def __init__(self, parent = None):
QtGui.QDialog._ _init__(self, parent)
def setLabel(self, tpl):
print "####tpl:", tpl
print "**********tpl: ", str(tpl)
return
if __name__ == "__main__":
app = QtGui.QApplicat ion(sys.argv)
dialog = Gui()
d = D()
QtCore.QObject. connect(d, QtCore.SIGNAL(" setLabel"),
dialog.setLabel , QtCore.Qt.Queue dConnection)
sys.exit(dialog .exec_())

The output i'm getting is as follows:

tpl: ('Primary', 'priSec')
####tpl: (<refcnt 0 at 0xb7caac8c>,)
**********tpl: ((((((((<NULL>, ),),),),),),),)

Can anyone kindly tell me what's happening here? Why is the tuple
("Primary", "priSec") getting converted to this <NULLthingy? And
what is this thingy anyways (It looks to be a deeply nested tuple, but
am not sure).

Thanks a lot!
--
warm regards,
Pradnyesh Sawant
--
Be yourself, everyone else is taken. --Anon

[Diez B. Roggisch]

Pradnyesh Sawant schrieb:

Hello,
I have a pyqt4 code in which i'm trying the signal/slot mechanism. The
(stripped) code is as follows:

class D(QtCore.QThrea d):
def __init__(self):
QtCore.QThread. __init__(self)
tpl = ("Primary", "priSec")
print "tpl:", tpl
self.emit(QtCor e.SIGNAL("setLa bel"), tpl)
class Gui(QtGui.QDial og):
def __init__(self, parent = None):
QtGui.QDialog._ _init__(self, parent)
def setLabel(self, tpl):
print "####tpl:", tpl
print "**********tpl: ", str(tpl)
return
if __name__ == "__main__":
app = QtGui.QApplicat ion(sys.argv)
dialog = Gui()
d = D()
QtCore.QObject. connect(d, QtCore.SIGNAL(" setLabel"),
dialog.setLabel , QtCore.Qt.Queue dConnection)
sys.exit(dialog .exec_())

The output i'm getting is as follows:

tpl: ('Primary', 'priSec')
####tpl: (<refcnt 0 at 0xb7caac8c>,)
**********tpl: ((((((((<NULL>, ),),),),),),),)

Can anyone kindly tell me what's happening here? Why is the tuple
("Primary", "priSec") getting converted to this <NULLthingy? And
what is this thingy anyways (It looks to be a deeply nested tuple, but
am not sure).

It's just wild guessing back from my Qt3-days - but isn't PYSIGNAL
instead of SIGNAL necessary here?

Diez

[Phil Thompson]

On Thursday 26 April 2007 3:41 pm, Diez B. Roggisch wrote:

Pradnyesh Sawant schrieb:

Hello,
I have a pyqt4 code in which i'm trying the signal/slot mechanism. The
(stripped) code is as follows:

class D(QtCore.QThrea d):
def __init__(self):
QtCore.QThread. __init__(self)
tpl = ("Primary", "priSec")
print "tpl:", tpl
self.emit(QtCor e.SIGNAL("setLa bel"), tpl)
class Gui(QtGui.QDial og):
def __init__(self, parent = None):
QtGui.QDialog._ _init__(self, parent)
def setLabel(self, tpl):
print "####tpl:", tpl
print "**********tpl: ", str(tpl)
return
if __name__ == "__main__":
app = QtGui.QApplicat ion(sys.argv)
dialog = Gui()
d = D()
QtCore.QObject. connect(d, QtCore.SIGNAL(" setLabel"),
dialog.setLabel , QtCore.Qt.Queue dConnection)
sys.exit(dialog .exec_())

The output i'm getting is as follows:

tpl: ('Primary', 'priSec')
####tpl: (<refcnt 0 at 0xb7caac8c>,)
**********tpl: ((((((((<NULL>, ),),),),),),),)

Can anyone kindly tell me what's happening here? Why is the tuple
("Primary", "priSec") getting converted to this <NULLthingy? And
what is this thingy anyways (It looks to be a deeply nested tuple, but
am not sure).

It's just wild guessing back from my Qt3-days - but isn't PYSIGNAL
instead of SIGNAL necessary here?

No, PyQt4 used SIGNAL for both Qt and Python signals.

Phil