Small COM fix/improvements

windows/com.py

@@ -69,12 +69,22 @@ class TypeInfo(interfaces.ITypeInfo):
         self.GetDocumentation(id, res, None, None, None)
         return res
 
+
+class MemoryIStream(gdef.IStream):
+    @classmethod
+    def create(cls):
+        self = cls()
+        windows.winproxy.CreateStreamOnHGlobal(ppstm=self)
+        return self
+
 def create_instance(clsiid, targetinterface, custom_iid=None, context=CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER):
     """A simple wrapper around ``CoCreateInstance <https://msdn.microsoft.com/en-us/library/windows/desktop/ms686615(v=vs.85).aspx>``"""
     if custom_iid is None:
         custom_iid = targetinterface.IID
     if isinstance(clsiid, basestring):
         clsiid = IID.from_string(clsiid)
+    if isinstance(custom_iid, basestring):
+        custom_iid = IID.from_string(custom_iid)
     winproxy.CoCreateInstance(byref(clsiid), None, context, byref(custom_iid), byref(targetinterface))
     return targetinterface
 

windows/debug/symbols.py

@@ -238,6 +238,8 @@ class SymbolType(object):
     @property
     def children(self):
         count = self.nb_children
+        if count is None:
+            return None
         class res_struct(ctypes.Structure):
             _fields_ = [("Count", gdef.ULONG), ("Start", gdef.ULONG), ("Types", (gdef.ULONG * count))]
         x = res_struct()
@@ -520,7 +522,7 @@ class SymbolHandler(object):
         else:
             callback = ctypes.WINFUNCTYPE(gdef.BOOL, ctypes.POINTER(SymbolInfo), gdef.ULONG , ctypes.py_object)(callback)
 
-        addr = getattr(mod, "addr", mod) # Retrieve mod.addr, else us the value directly
+        addr = getattr(mod, "addr", mod) # Retrieve mod.addr, else use the value directly
         windows.winproxy.SymSearchW(self.handle, gdef.DWORD64(addr), 0, tag, mask, 0, callback, res, options)
         for sym in res:
             sym.resolver = self

windows/security.py

@@ -218,6 +218,7 @@ SPECIFIC_ACCESS_RIGTH_BY_TYPE = {
     "callback": CALLBACK_ACCESS_RIGHT,
     "mutant": MUTANT_ACCESS_RIGHT,
     "event": EVENT_ACCESS_RIGHT,
+    "section": SECTION_ACCESS_RIGHT,
     "semaphore": SEMAPHORE_ACCESS_RIGHT,
     "io_completion": IO_COMPLETION_ACCESS_RIGHT,
     "port": PORT_ACCESS_RIGHT,