The MASM Forum Archive 2004 to 2012

how would i go about supplying the value returned from GetWindowLong in this code

Quoteinvoke GetWindowLong, hDlg, GWL_EXSTYLE 
               invoke SetWindowLong, hDlg, GWL_EXSTYLE, WS_EX_LAYERED or eax

i get the "error constant expected"

thanks.

:U



invoke GetWindowLong, hDlg, GWL_EXSTYLE
.if (eax != 0)

    or eax, WS_EX_LAYERED
    invoke SetWindowLong, hDlg, GWL_EXSTYLE, eax

.endif



Maybe in that case this is better...


invoke GetWindowLong, hDlg, GWL_EXSTYLE
or eax, WS_EX_LAYERED
invoke SetWindowLong, hDlg, GWL_EXSTYLE, eax


jdoe, thanks! i got the picture  :U

remember that the invoke macro unfolds to become a series of pushes followed by a call, so, you can't have 'constant or eax' because you can't 'push constant or eax'. so you would 'or eax,constant' then use eax as your parameter to invoke.

Hi Rainstorm,

Another solution based on the following macro :

.
.
TEST_VALUE equ 0

Calc MACRO operation

    operation

    EXITM <eax>

ENDM

.code

start:

    xor     eax,eax
    invoke  ExitProcess,Calc(<or eax,TEST_VALUE>)

END start


nice one, thx vortex !  :U