Defining a structure with a byte array in it ?

[James Ladd]

I need a structure that contains a buffer and I have defined it as follows

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    MYSTRUCT struct
        buffer BYTE[4096] ?
    MYSTRUCT ends


Is this what I expect as it compiles ok.
ie: I have a buffer of 4096 bytes

[thomasantony]

Yes :U

[Mark Jones]

Striker, I can think of something else you could try. I'm no pro at this and this code is untested:

Code Select Expand


.data
    MYSTRUCT struct
        lpBuffer DWORD 0  ; lpBuffer is a pointer
    MYSTRUCT ends

.code
    invoke LocalAlloc, LPTR, nBytes ; locked buffer of nBytes
; If the function fails, the return value is NULL.
; To get extended error information, call GetLastError.
    mov MYSTRUCT.lpBuffer, eax  ; save our pointer

; When the buffer is no longer needed, it must be freed!
    invoke LocalFree, MYSTRUCT.lpBuffer


GlobalAlloc GPTR will also work, but they all access the same flat memory in Win32.

[James Ladd]

Mark,
Thanks, but I wanted the memory fixed and not dynamic.
Ill keep you approach in mind though.
Thanks Thomas.

Rgs, striker

[Mark Jones]

James, I think LPTR signifies LMEM_FIXED + LMEM_ZEROINIT, and nBytes can be a literal value, variable, or constant. Hope that helps. :)