passing a GUID byref?

[thug]

HI,

Im looking to write a plugin for eventghost.

But i'm a bit of a noob...

I need to pass the address of a variable, that is a GUID, to a dll function.

as in 'c++'

GUID MyGuid;
SomeDllFuntion(&MyGuid);


this is what I have so far....

Code: Select all

from eg.WinAPI.GUID import GUID

    def __start__(self):

        Mydll = WinDLL('somedll')

        MyGuid = GUID

        Mydll.SomeDllFunction(byref(MyGuid))

        print (MyGuid)

but when the plugin starts i get :-

Code: Select all

3:30:22 PM   File "C:\Program Files\EventGhost\eg\TreeItems\PluginItem.py", line 107, in StartPlugin
3:30:22 PM   File "plugins/NewPlugin/__init__.py", line 35, in __start__
3:30:22 PM TypeError: byref() argument must be a ctypes instance, not '_ctypes.StructType'

and without the byref() i get :-

Code: Select all

3:33:22 PM ArgumentError: argument 1: <type 'exceptions.TypeError'>: Don't know how to convert parameter 1

[Bitmonster]

All ctypes must be instantiated to function as a buffer. Otherwise the identifier stays a "type".

So:
MyGuid = GUID
means, that you assign another name (MyGuid) to the "type" of GUID.

But:
MyGuid = GUID()
means, that you create a new instance of the type GUID and that's what you want.

EDIT:
To show the actual content of a ctype, you need to use the field "value" of a it. So I assume you need to write:
print MyGuid.value

[thug]

Awesome, That did the trick!

static ulong URAStar;

URAStar+=5000;

[Bitmonster]

Excuse my curiosity:
What kind of plugin are your writing?