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197 lines
8.0 KiB
197 lines
8.0 KiB
6 years ago
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# Code that packs and unpacks the Univgw structures.
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# See if we have a special directory for the binaries (for developers)
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import types
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import pythoncom
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from win32com.client import gencache
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com_error = pythoncom.com_error
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_univgw = pythoncom._univgw
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def RegisterInterfaces(typelibGUID, lcid, major, minor, interface_names = None):
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ret = [] # return a list of (dispid, funcname for our policy's benefit
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# First see if we have makepy support. If so, we can probably satisfy the request without loading the typelib.
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try:
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mod = gencache.GetModuleForTypelib(typelibGUID, lcid, major, minor)
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except ImportError:
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mod = None
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if mod is None:
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import win32com.client.build
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# Load up the typelib and build (but don't cache) it now
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tlb = pythoncom.LoadRegTypeLib(typelibGUID, major, minor, lcid)
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typecomp_lib = tlb.GetTypeComp()
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if interface_names is None:
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interface_names = []
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for i in range(tlb.GetTypeInfoCount()):
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info = tlb.GetTypeInfo(i)
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doc = tlb.GetDocumentation(i)
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attr = info.GetTypeAttr()
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if attr.typekind == pythoncom.TKIND_INTERFACE or \
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(attr.typekind == pythoncom.TKIND_DISPATCH and attr.wTypeFlags & pythoncom.TYPEFLAG_FDUAL):
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interface_names.append(doc[0])
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for name in interface_names:
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type_info, type_comp = typecomp_lib.BindType(name, )
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# Not sure why we don't get an exception here - BindType's C
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# impl looks correct..
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if type_info is None:
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raise ValueError("The interface '%s' can not be located" % (name,))
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# If we got back a Dispatch interface, convert to the real interface.
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attr = type_info.GetTypeAttr()
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if attr.typekind == pythoncom.TKIND_DISPATCH:
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refhtype = type_info.GetRefTypeOfImplType(-1)
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type_info = type_info.GetRefTypeInfo(refhtype)
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attr = type_info.GetTypeAttr()
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item = win32com.client.build.VTableItem(type_info, attr, type_info.GetDocumentation(-1))
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_doCreateVTable(item.clsid, item.python_name, item.bIsDispatch, item.vtableFuncs)
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for info in item.vtableFuncs:
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names, dispid, desc = info
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invkind = desc[4]
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ret.append((dispid, invkind, names[0]))
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else:
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# Cool - can used cached info.
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if not interface_names:
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interface_names = list(mod.VTablesToClassMap.values())
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for name in interface_names:
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try:
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iid = mod.NamesToIIDMap[name]
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except KeyError:
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raise ValueError("Interface '%s' does not exist in this cached typelib" % (name,))
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# print "Processing interface", name
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sub_mod = gencache.GetModuleForCLSID(iid)
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is_dispatch = getattr(sub_mod, name + "_vtables_dispatch_", None)
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method_defs = getattr(sub_mod, name + "_vtables_", None)
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if is_dispatch is None or method_defs is None:
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raise ValueError("Interface '%s' is IDispatch only" % (name,))
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# And create the univgw defn
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_doCreateVTable(iid, name, is_dispatch, method_defs)
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for info in method_defs:
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names, dispid, desc = info
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invkind = desc[4]
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ret.append((dispid, invkind, names[0]))
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return ret
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def _doCreateVTable(iid, interface_name, is_dispatch, method_defs):
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defn = Definition(iid, is_dispatch, method_defs)
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vtbl = _univgw.CreateVTable(defn, is_dispatch)
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_univgw.RegisterVTable(vtbl, iid, interface_name)
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def _CalcTypeSize(typeTuple):
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t = typeTuple[0]
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if t & (pythoncom.VT_BYREF | pythoncom.VT_ARRAY):
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# Its a pointer.
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cb = _univgw.SizeOfVT(pythoncom.VT_PTR)[1]
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elif t == pythoncom.VT_RECORD:
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# Just because a type library uses records doesn't mean the user
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# is trying to. We need to better place to warn about this, but it
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# isn't here.
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#try:
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# import warnings
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# warnings.warn("warning: records are known to not work for vtable interfaces")
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#except ImportError:
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# print "warning: records are known to not work for vtable interfaces"
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cb = _univgw.SizeOfVT(pythoncom.VT_PTR)[1]
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#cb = typeInfo.GetTypeAttr().cbSizeInstance
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else:
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cb = _univgw.SizeOfVT(t)[1]
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return cb
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class Arg:
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def __init__(self, arg_info, name = None):
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self.name = name
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self.vt, self.inOut, self.default, self.clsid = arg_info
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self.size = _CalcTypeSize(arg_info)
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# Offset from the beginning of the arguments of the stack.
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self.offset = 0
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class Method:
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def __init__(self, method_info, isEventSink=0):
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all_names, dispid, desc = method_info
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name = all_names[0]
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names = all_names[1:]
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invkind = desc[4]
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arg_defs = desc[2]
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ret_def = desc[8]
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self.dispid = dispid
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self.invkind = invkind
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# We dont use this ATM.
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# self.ret = Arg(ret_def)
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if isEventSink and name[:2] != "On":
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name = "On%s" % name
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self.name = name
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cbArgs = 0
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self.args = []
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for argDesc in arg_defs:
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arg = Arg(argDesc)
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arg.offset = cbArgs
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cbArgs = cbArgs + arg.size
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self.args.append(arg)
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self.cbArgs = cbArgs
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self._gw_in_args = self._GenerateInArgTuple()
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self._gw_out_args = self._GenerateOutArgTuple()
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def _GenerateInArgTuple(self):
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# Given a method, generate the in argument tuple
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l = []
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for arg in self.args:
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if arg.inOut & pythoncom.PARAMFLAG_FIN or \
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arg.inOut == 0:
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l.append((arg.vt, arg.offset, arg.size))
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return tuple(l)
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def _GenerateOutArgTuple(self):
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# Given a method, generate the out argument tuple
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l = []
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for arg in self.args:
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if arg.inOut & pythoncom.PARAMFLAG_FOUT or \
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arg.inOut & pythoncom.PARAMFLAG_FRETVAL or \
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arg.inOut == 0:
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l.append((arg.vt, arg.offset, arg.size, arg.clsid))
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return tuple(l)
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class Definition:
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def __init__(self, iid, is_dispatch, method_defs):
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self._iid = iid
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self._methods = []
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self._is_dispatch = is_dispatch
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for info in method_defs:
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entry = Method(info)
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self._methods.append(entry)
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def iid(self):
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return self._iid
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def vtbl_argsizes(self):
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return [m.cbArgs for m in self._methods]
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def vtbl_argcounts(self):
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return [len(m.args) for m in self._methods]
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def dispatch(self, ob, index, argPtr,
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ReadFromInTuple=_univgw.ReadFromInTuple,
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WriteFromOutTuple=_univgw.WriteFromOutTuple):
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"Dispatch a call to an interface method."
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meth = self._methods[index]
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# Infer S_OK if they don't return anything bizarre.
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hr = 0
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args = ReadFromInTuple(meth._gw_in_args, argPtr)
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# If ob is a dispatcher, ensure a policy
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ob = getattr(ob, "policy", ob)
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# Ensure the correct dispid is setup
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ob._dispid_to_func_[meth.dispid] = meth.name
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retVal = ob._InvokeEx_(meth.dispid, 0, meth.invkind, args, None, None)
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# None is an allowed return value stating that
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# the code doesn't want to touch any output arguments.
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if type(retVal) == tuple: # Like pythoncom, we special case a tuple.
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# However, if they want to return a specific HRESULT,
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# then they have to return all of the out arguments
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# AND the HRESULT.
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if len(retVal) == len(meth._gw_out_args) + 1:
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hr = retVal[0]
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retVal = retVal[1:]
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else:
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raise TypeError("Expected %s return values, got: %s" % (len(meth._gw_out_args) + 1, len(retVal)))
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else:
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retVal = [retVal]
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retVal.extend([None] * (len(meth._gw_out_args)-1))
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retVal = tuple(retVal)
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WriteFromOutTuple(retVal, meth._gw_out_args, argPtr)
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return hr
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