in reply to Working with C structures over network

Be careful of alignment issues. Especially where you have non-byte members following single bytes within a struct. C compilers will often add padding to place WORD and DWORD members on 2 or 4 byte boundaries for efficiency reasons.

To quote K&R (page 130 in my copy).

But don't assume that the size of a struct is the sum of the size of it's members--because of alignment requirements for different objects, there may be "holes" in the structure.
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