i've been trying make code work, still can't see flaw is. i'm trying emit signal new thread, main receives signal , executes function.
if try within same thread, works fine - code, thread created, signal never connected.
from pyqt4.qtcore import * pyqt4.qtgui import * pyqt4 import qtcore class workthread(qtcore.qthread): def __init__(self): qtcore.qthread.__init__(self) def run(self): print("from thread") self.emit(qtcore.signal("trying")) return class foo(qobject): def handle_trigger(self): print ("trigger signal received") def new_thread(self): self.get_thread = workthread() self.connect(self.get_thread, qtcore.signal("trying"), self.handle_trigger) self.get_thread.start() = foo() a.new_thread()
edited based on comments.
there 1 main problem code. you're not starting qt application, there no main event loop running. must add following lines:
app = qapplication(sys.argv) app.exec_() also, should use new-style qt signals/slots if possible, or if stick old-style, know qt signal should in form of c function if want work pyside. change work pyside, qtcore.signal("trying()"), not qtcore.signal("trying"). see comments (specifically mine , @ekhumoro's comments) details.
here's working version of code (using old-style signals/slots), tried change least amount possible see small changes. had use pyside instead, should work pyqt well:
from pyside.qtcore import * pyside.qtgui import * pyside import qtcore import sys class workthread(qtcore.qthread): def __init__(self): qtcore.qthread.__init__(self) def run(self): print("from thread") self.emit(qtcore.signal("trying()")) class foo(qobject): def handle_trigger(self): print ("trigger signal received") self.get_thread.quit() self.get_thread.wait() qapplication.quit() def new_thread(self): self.get_thread = workthread() self.connect(self.get_thread, qtcore.signal("trying()"), self.handle_trigger) self.get_thread.start() = foo() a.new_thread() app = qapplication(sys.argv) app.exec_() and here's version using new signal/slot style (see @three_pineapples comment). recommended way implement signals/slots in pyqt/pyside.
from pyside.qtcore import * pyside.qtgui import * pyside import qtcore import sys class workthread(qtcore.qthread): ranthread = qtcore.signal() # pyqt, use qtcore.pyqtsignal() instead def __init__(self): qtcore.qthread.__init__(self) def run(self): print("from thread") self.ranthread.emit() class foo(qobject): def handle_trigger(self): print ("trigger signal received") self.get_thread.quit() self.get_thread.wait() qapplication.quit() def new_thread(self): self.get_thread = workthread() self.get_thread.ranthread.connect(self.handle_trigger) self.get_thread.start() = foo() a.new_thread() app = qapplication(sys.argv) app.exec_() 
Comments
Post a Comment