Error on Panda3D

Question

i am trying to make a screenshot function, but everytime i try, it gives me this error:

Traceback (most recent call last):
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 61, in eventLoop
Task
    self.doEvents()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 55, in doEvents
    processFunc(self.eventQueue.dequeueEvent())
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 122, in processE
vent
    messenger.send(eventName, paramList)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
  File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 2317, in __oobeButto
n
    messenger.send(button + suffix)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
TypeError: Screenie() takes exactly 1 argument (0 given)
:task(error): Exception occurred in PythonTask eventManager
Traceback (most recent call last):
  File "Play.py", line 791, in <module>
    run()
  File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 2921, in run
    self.taskMgr.run()
  File "C:\Panda3D-1.8.1\direct\task\Task.py", line 502, in run
    self.step()
  File "C:\Panda3D-1.8.1\direct\task\Task.py", line 460, in step
    self.mgr.poll()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 61, in eventLoop
Task
    self.doEvents()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 55, in doEvents
    processFunc(self.eventQueue.dequeueEvent())
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 122, in processE
vent
    messenger.send(eventName, paramList)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
  File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 2317, in __oobeButto
n
    messenger.send(button + suffix)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
TypeError: Screenie() takes exactly 1 argument (0 given)

Heres the part which does the screenshots

def Screenie(self):
file_name = Filename('whatever.png')

self.win.saveScreenshot(file_name)

  base.accept('f9', Screenie)

Can someone tell me whats wrong with it? I'm trying to fix it but can't figure out what to do...

Answer 1

The error is quite clear

TypeError: Screenie() takes exactly 1 argument (0 given)

Your Screenie function takes one argument (self), but whatever is calling it, did so without giving any argument (i.e. Screenie() instead of Screenie(obj)).

Your choice of self as argument to Screenie makes me think it is a class method. In that case you should have something like this.

class SomeCLass(object):
    # <snip>
    def Screenie(self):
        file_name = Filename('whatever.png')
        self.win.saveScreenshot(file_name)

# Create instance
instance = SomeClass()

# Bind keypress to bound method on instance
base.accept('f9', instance.Screenie)

This makes sure that the self argument of Screenie is bound to the instance object, and your code should work.