Having trouble aligning an array of structures

[zin]

hello, i have problem i try to align array of structures but it's dosen't work ,
when i look at the memory window in debugging i see the values are not align

MyStruct STRUCT
   
    field1 WORD ?
    align DWORD
    field2 DWORD 20 DUP(?)

MyStruct ENDS

.data
   
    hello MyStruct 20 dup (<2,20 DUP (4)>)

but when i declare only one veriable of structurs it does, why is it happening somebody know ?

MyStruct STRUCT
   
    field1 WORD ?
    align DWORD
    field2 DWORD 20 DUP(?)

MyStruct ENDS

.data
   
    hello MyStruct <2,20 DUP (4)>

[hutch--]

MyStruct STRUCT DWORD
...
MyStruct ENDS

With WORD sized members, either pair them or add padding.

[zin]

Thank you for the quick response,
I added what you wrote but it still doesn't work

MyStruct STRUCT DWORD
   
    field1 WORD ?
    align DWORD
    field2 DWORD 20 DUP(?)

MyStruct ENDS

[hutch--]

MyStruct STRUCT DWORD
    field1 dw ?
    dummy dw ?
    field2 DWORD 20 DUP(?)
MyStruct ENDS

[_japheth]

hello, i have problem i try to align array of structures but it's dosen't work ,
when i look at the memory window in debugging i see the values are not align

Might very well be a debugger problem. You can verify the correct size by adding:

Code Select Expand


        mov eax,sizeof hello


and then examine the listing file; eax should be loaded with 690h, which is 1680 decimal.

EDIT: perhaps this is indeed a Masm bug. The listing looks ok, but the object module, at least for output format -coff and Masm v8, looks not ok

You can verify this yourself with: DUMPBIN /rawdata <filename>.obj

Workaround: use jwasm/uasm/...

[zin]

hello, i have problem i try to align array of structures but it's dosen't work ,
when i look at the memory window in debugging i see the values are not align

Might very well be a debugger problem. You can verify the correct size by adding:

Code Select Expand


        mov eax,sizeof hello


and then examine the listing file; eax should be loaded with 690h, which is 1680 decimal.

EDIT: perhaps this is indeed a Masm bug. The listing looks ok, but the object module, at least for output format -coff and Masm v8, looks not ok

You can verify this yourself with: DUMPBIN /rawdata <filename>.obj

Workaround: use jwasm/uasm/...

I'm pretty new in the field so I still don't know what you mean by that:

  "You can verify this yourself with: DUMPBIN /rawdata <filename>.obj

Workaround: use jwasm/uasm/...".

But yes I check by the sizeof and I see that the size it catches is correct.
thenk you!

[zin]

MyStruct STRUCT DWORD
    field1 dw ?
    dummy dw ?
    field2 DWORD 20 DUP(?)
MyStruct ENDS

like this its look ok thenk you