IDA Help: set_member_type

Change structure member type.

This function can be used in two forms.
First form:
long set_member_type(long id, long member_offset, long flag, long typeid, long nitems);

Second form:
long set_member_type(long id, long member_offset, long flag, long typeid, long nitems,
                     long target, long tdelta, long reftype);

arguments:
  id            - structure type ID
  member_offset - offset of the member
  flag    - new type of the member. Should be one of
            FF_BYTE..FF_PACKREAL (see above)
            combined with FF_DATA
  typeid  - if is_struct(flag) then typeid specifies
            the structure id for the member
            if is_off0(flag) then typeid specifies
            the offset base.
            if is_strlit(flag) then typeid specifies
            the string type (STRTYPE_...).
            if is_stroff(flag) then typeid specifies
            the structure id
            if is_enum(flag) then typeid specifies
            the enum id
            Otherwise typeid should be -1
  nitems  - number of items in the member
the remaining arguments are allowed only if is_off0(flag) and you want
to specify a complex offset expression:
  target  - target address of the offset expr. You may specify it as
            -1, ida will calculate it itself
  tdelta  - offset target delta. usually 0
  reftype - see REF_... definitions
returns:        !=0 - ok.

long set_member_type(long id, long member_offset, long flag, long typeid, long nitems,
                     long target, long tdelta, long reftype);