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How to import a Unsigned Long (ULONG64) into x64 ASM File in Visual Studio 2019

Vikki Mehra 31 Reputation points
2022-04-12T23:15:49.183+00:00

OK so I'm using Visual Studio Community 2019 with MASM enabled and I'm trying to declare a variable that is defined outside of the .ASM file but in the same project. How can I do this ?

I've tried the following: 

EXTERN MyVar:ULONG64

but Visual Studio gives me the following compile error:

Error A2006 undefined symbol : ULONG64 TestDrv C:\Users\XFL\Documents\Visual Studio 2019\Projects\XFL\TestDrv\TestDrv\SwapSrc.asm

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