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Asked: 2026-05-10T18:21:20+00:00

I am developing a TCP/IP client that has to deal with a proprietary binary

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I am developing a TCP/IP client that has to deal with a proprietary binary protocol. I was considering using user-defined types to represent the protocol headers, and using CopyMemory to shuffle data to and from the UDT and a byte array. However, it appears that VB6 adds padding bytes to align user-defined types. Is there any way to force VB6 to not pad UDT’s, similar to the #pragma pack directive available in many C/C++ compilers? Perhaps a special switch passed to the compiler?

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1 Answer

  1. No.

    Your best bet is to write the low level code in C or C++ (where you do have #pragma pack), then expose the interface via COM.

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