Bug 3896

Summary:	python-dbus: sending empty lists doesn't work
Product:	dbus	Reporter:	Lennart Poettering <mzsqb>
Component:	core	Assignee:	Havoc Pennington <hp>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	high
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Lennart Poettering 2005-07-28 03:49:35 UTC

If I try to call a remote DBUS method with an empty string array as argument
with python-dbus I always get an IndexError on the client side:

  File "dbus_bindings.pyx", line 878, in dbus_bindings.MessageIter.append
  File "dbus_bindings.pyx", line 1033, in dbus_bindings.MessageIter.append_array
IndexError: list index out of range

Comment 1 Lennart Poettering 2005-07-28 03:51:51 UTC

A related bug: if I try to send a dbus.Byte(0), I get nearly the same error.
(Though dbus.UInt32(0) and friends work)

Comment 2 Lennart Poettering 2005-08-09 10:44:19 UTC

I opened a new bug report for this dbus.Byte(0) issue, which even contains a patch: 

https://bugs.freedesktop.org/show_bug.cgi?id=4023

Alas the empty list issue remains.

Comment 3 John (J5) Palmieri 2005-08-16 14:13:50 UTC

This should be in cvs shortly.  To do this you can specify signitures or types:

dbus.Array([], signiture="s") #empty array of strings
dbus.Array([], signiture="(ii)") #empty array of a struct containing two int32's
dbus.Array([], type=dbus.String)  #empty array of strings
dbus.Array([], type=dbus.Struct((dbus.Int32, dbus.Int32))) # not sure if this
will work but it should - empty array of a struct containing two int32's

Varients work the same way.

Dictionaries are a bit different:

dbus.Dictionary({}, signiture="ss") #an empty dictionary containing string key's
and string values
dbus.Dictionary({}, key_type=dbus.String, value_type=dbus.String) #an empty
dictionary containing string key's and string values 


Note that you can not specify both types and signatures.

Comment 4 Lennart Poettering 2005-08-16 14:19:08 UTC

I hope the typo "signiture" is just in this bug report and not in the code?

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