(Zt) This is the definition of memory alignment rules applicable to most platforms currently.

This is the definition of memory alignment rules applicable to most platforms currently.

# Ifdef hp_unix
# Pragma Pack 1
# Elif defined (Aix)
# Pragma options align = packed
# Elif defined (_ Win32)
# Pragma pack (push, 1)
# Else
# Pragma pack (1)
# Endif

... Data structure definition

# Ifdef hp_unix
# Pragma Pack 4
# Elif defined (Aix)
# Pragma options align = Reset
# Elif defined (_ Win32)
# Pragma pack (POP)
# Else
# Pragma pack ()
# Endif

Alignment Errors will generate strange data parsing errors. Be careful.