virtual at esp problem

i am calling GetCursorPos to get the current mouse position so i can call TrackPopupMenu.
instead of using a global variable POINT, i made room on the stack then did this

Code:

virtual at esp
.curpos POINT
end virtual

lea ebx, [.curpos]
push ebx
call [GetCursorPos]

however, the popup menu is placed in the bottom left of screen (0, 0 coordinates).

if i change it to

Code:

lea esi, [esp]
virtual at ESI

...same as above

it works and the menu is placed correctly.

now, i thought esi will be the same value as esp because of the LEA instruction so i dont understand how using LEA and ESI makes the code work.

am i doing something wrong ?

i used

Code:

virtual at esp
.wc WNDCLASSEX
end virtual

to set window class properties and RegisterClassEx with the WNDCLASSEX on the stack and that works. thats why i cant understand why it doesnt work with the GetCursorPos.[/code]

virtual at esp .curpos POINT end virtual sub esp,sizeof.POINT lea ebx, [.curpos] ;you can also use "mov ebx,esp" here push ebx call [GetCursorPos] ... ;here is some code using ebx that points to .curpos add esp,sizeof.POINT ;we're finished with .curpos