VS/VC++ Struct Member Alignment (set to 4)?

Question

I would like to ask why Struct Member Alignement is set to 4 instead to Default (or 8 on x64)?

(in Visual Studio 2008 - Project properties ( -> Configuration properties) -> C/C++ -> Code Generation -> Struct Member Alignment)

There were runtime problems after linking with an external library (default alignment); so it might be better to change the skeleton template in SDK.

For example in After Effects CS5 SDK for windows in:

after_effects_cs5_sdk_win\Adobe After Effects CS5 Win SDK\Examples\template\Skeleton\win\Skeleton.vcproj

look for:

StructMemberAlignment="3"

and set it to 0 (default) or at least to 4 (64bit alignment)

StructMemberAlignment="0"

or

StructMemberAlignment="4"

greets

m

Zac Lam · Answer

Hi Mike,I believe you're correct, thanks for pointing that out. These projects had been brought forward from the CS4 versions, which were 32-bit, and used 4-byte alignment at the time. Fortunately, the standard headers include PreConfig.h, which sets 8-byte alignment for the AE API structure definitions. But it makes sense to no longer set 4-byte alignment in the vcprojs.Cheers,Zac

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