[python-win32] COM: Minimal example of a custom server working with DispatchWithEvents()

[William Belanger]

That works, thank you. I'm relieved to finally move forward with this.
Revised example;

#!/usr/bin/python3
> # https://gitlab.com/-/snippets/2155778
>
> import pythoncom
> import sys
> import threading
> import win32com.client
> import win32com.server.util
> from win32com.server import localserver
>
>
> class EventHandler:
>     _public_methods_ = ["ping"]
>
>     def __init__(self):
>         self.server = win32com.client.Dispatch("Minimal.Example")
>         self.server.setParent(win32com.server.util.wrap(self))
>         self.server.Ping()  # ##
>
>     def ping(self):
>         print("pong")
>
>
> class ServerAdapter:
>     _reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
>     _reg_clsid_ = "{D390AE78-D6A2-47CF-B462-E4F2DC9C70F5}"
>     _reg_progid_ = "Minimal.Example"
>     _reg_verprogid_ = "Minimal.Example.1"
>     _reg_class_spec_ = "MinimalExample.ServerAdapter"
>     _public_attrs_ = ["parent"]
>     _public_methods_ = ["setParent", "Ping"]
>
>     def setParent(self, parent):
>         self.parent = win32com.client.Dispatch(parent)
>
>     def Ping(self):
>         self.parent.ping()
>
>
> def server_init():
>     pythoncom.CoInitialize()
>     localserver.serve(["{D390AE78-D6A2-47CF-B462-E4F2DC9C70F5}"])
>
>
> if __name__ == "__main__":
>     if "--register" in sys.argv[1:] or "--unregister" in sys.argv[1:]:
>         import win32com.server.register
>         win32com.server.register.UseCommandLine(ServerAdapter)
>     else:
>         server_thread = threading.Thread(target=server_init)
>         server_thread.start()
>         EventHandler()
>

Best,
Will

Le sam. 31 juil. 2021 à 21:36, Mark Hammond <mhammond at skippinet.com.au> a
écrit :

>
> On 1/08/2021 12:21 am, William Belanger wrote:
> > Hi,
> >
> >
> > Thank you for the follow up. Perhaps I did not express my need clearly
> > enough, so I made this minimal example;
> >
> >
> >     # https://gitlab.com/-/snippets/2155778
> >     <https://gitlab.com/-/snippets/2155778>
> >
> >     import pythoncom
> >     import sys
> >     import threading
> >     import win32com.client
> >     import win32com.server.util
> >     from win32com.server import localserver
> >
> >
> >     def init_server():
> >     pythoncom.CoInitialize()
> >     localserver.serve(["{D390AE78-D6A2-47CF-B462-E4F2DC9C70F5}"])
> >
> >
> >     class Main:
> >     def __init__(self):
> >     self.server = win32com.client.Dispatch("Minimal.Example")
> >     self.server.parent = self # TypeError: must be real number, not Main
>
> That exception is very odd and I should look into it - but the problem
> here is that you are trying to set an attribute on a COM object which is
> a Python instance, which doesn't really make sense. What you want is to
> set it to a COM object - which `self` is not. So something like:
>
>
> class Main:
>      _public_methods_ = ["pong"]
>      def __init__(self):
>          self.server = win32com.client.Dispatch("Minimal.Example")
>          self.server.parent = win32com.server.util.wrap(self)
>          self.server.Ping()
>
>      def pong(self):
>          return "pong"
>
> works. Sadly another paper-cut here is that the server just sees this as
> a plain IDispatch object rather than a `Dispatch` wrapper - so `Ping`
> needs to look something like:
>
>      def Ping(self):
>          parent_as_object = win32com.client.Dispatch(self.parent)
>          print(parent_as_object.pong())
>
> I guess you could, say, change `parent` into `set_parent()`, or
> intercept via __setattr__() and do the wrapping just once.
>
> HTH,
>
> Mark
>
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