Give a little help !

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Xanfa

Joined: 03 Aug 2006
Posts: 29

Xanfa 03 Aug 2006, 02:16

Hi everybody, i'm a newbie in assembler in windows, and have a little problem .
Anyone know something like this in Masm32:

assume edx: PTR MOUSEHOOKSTRUCT
invoke WindowFromPoint,[edx].pt.x,[edx].pt.y

How does it look in Fasm ?
I think I can code:

invoke WindowFromPoint,[edx],[edx+4]

but it isn't nice, is it ?

Please help, Thankx alot !

03 Aug 2006, 02:16

Xanfa

Joined: 03 Aug 2006
Posts: 29

Xanfa 03 Aug 2006, 02:49

Hmm! I've just read about an undocumented macro, "assume" !
And maybe it's what i'm expect.
But I still need all your idea, thanks !

03 Aug 2006, 02:49

farrier

Joined: 26 Aug 2004
Posts: 274
Location: North Central Mississippi

farrier 03 Aug 2006, 04:07

Xanfa,

Tomasz Grysztar posted these suggestions:

After loading the address of your structure into ebx,

Quote:

virtual at ebx
SomeAtEbx SomeStruct ; define instance at EBX address
end virtual

and then:
Code:
mov eax,[SomeAtEbx.Var2] ; assembles to mov eax,[ebx+4]

If you prefer to have the offsets only, you can do it like:
Code:
virtual at 0
SomeStruct SomeStruct ; define instance with the same name
end virtual

and then:
Code:
mov eax,[ebx+SomeStruct.Var2]

(this is what "struct" macro does internally). Choose the one you like more.

In your example you used edx, you would change the above references to ebx to edx!

hth,

farrier

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03 Aug 2006, 04:07

Reverend

Joined: 24 Aug 2004
Posts: 408
Location: Poland

Reverend 03 Aug 2006, 22:38

The 'struct' macro by default sets all constants. You reference them via [...+NAME_OF_STRUCTURE.StructureMember] eg.:

Code:

invoke WindowFromPoint,[edx + POINT.x],[edx + POINT.y]

03 Aug 2006, 22:38

Xanfa

Joined: 03 Aug 2006
Posts: 29

Xanfa 04 Aug 2006, 01:37

Oh, your way is simple, and all is done from Tomasz tutorial about win32 headers !
I've already read about struct macro, but I'm so stupid to missed it !

farrier and Reverend - Thanks alot !

04 Aug 2006, 01:37

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