Problems with creating a Struct in MASM32.

[Shooter]

Hey guys,
I'm getting this error:

ReadRegKey.asm(324) : error A2070: invalid instruction operands

For this line:

Code Select Expand

mov IPIndexNum,[edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwIndex

I'm trying to implement Michael's example from his sample, GetIpAddrTable, from his original line:

        printf "\n\tInterface Index[%d]:\t%d\n", \
                esi,[edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwIndex

I've tried to define IPIndexNum as both "DD ?" and "DW ?". The goal is to create a GUI application from his example, so I'd like to store the values into a variable to be called on by SendDlgItemMessage later on.

Can anyone give me a clue how to do this in MASM32?

Thanks,
-Shooter

[fearless]

I would move it to a register first, then move that to your variable (assuming IPIndexNum is defined as a dword value), so:

Code Select Expand

mov eax, [edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwIndex
mov IPIndexNum, eax

[dedndave]

or...

Code Select Expand

        push    [edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwIndex
        pop     IPIndexNum
might be a byte or 2 smaller   :P

[fearless]

That is true as well  :U

[dedndave]

when using register-index addressing - there may be no advantage to push/pop
i dunno - i'd have to disassemble some code to see

[Shooter]

You guys are my heroes! I did that push/pop thing and it works great. Now.... moving on to translating the rest of it into something I want it to do via my GUI. He-he-hehhh.  :bdg

[oex]

FYI there is a masm32 macro

m2m which will make your code a little neater in this context:

m2m IPIndexNum, [edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwAddr

Alternatively there is an equivilent eax register version mrm

[MichaelW]

In my GetIpAddrTable code, after I posted I noticed that my indirect memory operands are "over-specified". So for example in the code below, while the MIB_IPADDRTABLE reference is necessary to indicate what [edi] is pointing to, the MIB_IPADDRROW reference is not because the table member is declared in the MIB_IPADDRTABLE structure as a MIB_IPADDRROW structure.

Code Select Expand


        push [edi].MIB_IPADDRTABLE.table.MIB_IPADDRROW.dwAddr
        pop  IPAddr.S_un.S_addr


And the code can be shortened to:

Code Select Expand


        push [edi].MIB_IPADDRTABLE.table.dwAddr
        pop  IPAddr.S_un.S_addr


[Shooter]

In my GetIpAddrTable code, after I posted I noticed that my indirect memory operands are "over-specified".

Sometimes for a person like me, being "over-specified" can have it's advantages... that told me how it 'really' worked.  :bg