/pack switch
The /pack switch is the same as the /Zp option.
midl /pack packing_level
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packing_level
-
Specifies the packing level of structures in the target system. The packing-level value can be set to 1, 2, 4, or 8.
The /pack switch designates the packing level of structures in the target system. The packing-level value corresponds to the /Zp option value used by the Microsoft C/C++ version 7.0 compiler. For more information, see your Microsoft C/C++ programming documentation.
Specify the same packing level when you invoke the MIDL compiler and the C compiler. The default packing level used when neither the /Zp nor /pack switch is specified is 8, in both all build environments.
For a discussion of the potential dangers in using nonstandard packing levels, see the /Zp help topic.
midl /pack 2 filename.idl
midl /pack 8 bar.idl