Importing symbols without type casting

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PeExecutable

Joined: 26 Jun 2015
Posts: 181

PeExecutable 17 Aug 2015, 13:13

Is there a way to import a symbol or reference an external symbol as an interface?

Code:

extrn 'externalinterface' as myinterface:dword

That's how I normally do it and then I just use comcall directly on a register. But I would like to be able to use cominvk to reference the external interface.

17 Aug 2015, 13:13

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 17 Aug 2015, 14:59

PeExecutable
Didn't check that, but I guess, you could do the following:

Code:

interface IMyInterface,\
          MyMethod1,\
          MyMethod2

extrn 'ExternalObjectIMyInterface' as _ExternalObjectIMyInterface:dword
virtual at _ExternalObjectIMyInterface
    ExternalObjectIMyInterface IMyInterface
end virtual

That's provided the external label references a pointer to the object. If it references the object directly, then you need to use comcall anyway, but still no need to use an intermediate register.

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17 Aug 2015, 14:59

PeExecutable

Joined: 26 Jun 2015
Posts: 181

PeExecutable 17 Aug 2015, 16:04

That makes sense, I had a thought about 'virtual at' thanks for verifying it. (It reminds me of the absolute directive from nasm.)

17 Aug 2015, 16:04

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