In the win32com.client class CastTo method, it is assumed that the
target interface type exists in the same library as the object to be
casted. To work around that issue, I modified the method with an
optional argument stating the target interface's library, as follows:
def CastTo_mod(ob, target, typelib = None):
"""'Cast' a COM object to another interface"""
mod = None
if not typelib is None: # caller provided typelib of target
mod = gencache.MakeModuleForTypelib(typelib.clsid, typelib.lcid,
int(typelib.major), int(typelib.minor))
if not hasattr(mod, target):
raise ValueError("The interface name '%s' does not appear in the " \
"assigned library %r" % (target, typelib.ver_desc))
# todo - should support target being an IID
elif hasattr(target, "index"): # string like
# for now, we assume makepy for this to work.
# ... <snip> ....
mod = gencache.GetModuleForCLSID(target_clsid)
if not mod is None:
target_class = getattr(mod, target)
# resolve coclass to interface
target_class = getattr(target_class, "default_interface", target_class)
return target_class(ob) # auto QI magic happens
raise ValueError
after which I can cast to the type from some other library (targetlib) like
object = CastTo(object, 'targetinterfacename', targetlib)
where targetlib is a TypelibSpec taken from a search by name in the
list returned from selecttlb.EnumTlbs().
Any chance we can have some functionality like that in the release?
Thanks, Pieter
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