I have a structure that contains a UNION.
I cannot work out how to initialise it. Please help ?
EX1 struct
ex1f1 DWORD 0
ex1f2 WORD 0
EX1 ends
EX2 struct
ex2f1 BYTE 0
ex2f2 BYTE 0
EX2 ends
EX3 struct
func DWORD 0
union
first EX1 <>
second EX2 <>
ends
EX3 ends
; -----------------------------------------------------------------------------
;
.data
example EX3 <1, 2, 3>
.code
Does masm support the initialisation of UNIONS ?
It works this way
EX1 struct
ex1f1 DWORD 0
ex1f2 WORD 0
EX1 ends
EX2 struct
ex2f1 BYTE 0
ex2f2 BYTE 0
EX2 ends
EX3 struct
func DWORD 1
union
first EX1 <2,3>
second EX2 <2,3>
ends
EX3 ends
.data
example EX3 <>Hope this helps,
Darrel
EDIT:
QuoteDoes masm support the initialisation of UNIONS ?
No it doesn't.
If I get arount to making my own compiler I will make sure it does. :8)
If you need to use more than one structure and initialize at least one of them, you can use a hex editor and modify them.
Ok, thanks for that.
Let me rephrase the question. How can I initialise structures containing a UNION in the data section ?
For example I want to do this:
; -----------------------------------------------------------------------------
;
.data
example EX3 <1, 2, 3>
.code
I know this isnt the hardest of questions but I do need help with this !
rgs, striker
It's ambiguous.
Do you want to store "2" as a DWORD or a BYTE?
You're probably going to need to use an old-school technique - create a label and define each field separately.
Here are two examples of storing 2 and 3 as BYTEs (using EX2 field).
; this example uses the most primitive data types
example LABEL EX3 ; define a label of type EX3
DWORD 1 ; func
BYTE 2,3 ; ex2f1 and ex2f2
BYTE 4 DUP(0) ; padding to fill the EX3 structure
; this example uses as many structures as possible
example LABEL EX3 ; define a label of type EX3
DWORD 1 ; func
EX2 <2,3> ; second
BYTE 4 DUP(0) ; padding to fill the EX3 structure
tenkey,
Thanks for the example.
It must be real old-school coz I didnt know you could do that. Ill look up MASM help on LABEL.
Ill try what you suggest too.
<edit>Hey it worked well thanks so much.
Rgs, striker