ASM Community

; ########################################

        .386

        .model flat, stdcall

        option casemap :none



; ########################################



        include \masm32\include\windows.inc

        include \masm32\include\user32.inc

        include \masm32\include\kernel32.inc



        includelib \masm32\lib\user32.lib

        includelib \masm32\lib\kernel32.lib



; ########################################



    .data

        szClassName         db "Notepad", 0

        szApiName           db "SetLayeredWindowAttributes", 0

        szDllName           db "user32.dll", 0



        hwnd                dd 0



; ########################################



    .code



start:

    ; open notepad and run this example to make notepad transparent

    invoke FindWindow, addr szClassName, 0



    mov hwnd, eax



    push -20

    push eax

    invoke GetWindowLong, eax, -20 ; GWL_EXSTYLE



    mov edi, eax

    mov eax, 80000h ; WS_EX_LAYERED

    or eax, edi



    invoke SetWindowLong, hwnd, -20, eax



    invoke LoadLibrary, addr szDllName



    push eax ; for FreeLibrary



    invoke GetProcAddress, eax, addr szApiName



    push 2h ; LWA_ALPHA

    push 0C8h ; transparent level (0-255). 0 = invisible, 255 = visible

    push 0

    push hwnd

    call eax



    call FreeLibrary



    invoke ExitProcess, 0

end start



; ########################################

; ########################################

	.386

	.model flat, stdcall

	option casemap:none

; ########################################

	include \masm32\include\windows.inc

	include \masm32\include\user32.inc

	include \masm32\include\kernel32.inc



	includelib \masm32\lib\user32.lib

	includelib \masm32\lib\kernel32.lib

; ########################################



	.DATA

szClassName	db "Notepad", 0

szApiName	db "SetLayeredWindowAttributes", 0

szDllName	db "user32.dll", 0



ProStack	dd OFFSET szClassName, 0, -20, 0, -20, 80000h

	dd OFFSET szDllName, OFFSET szApiName, 0, 0, 196, 2, 0, 0



ProStackSize = ($ - ProStack)/4

; ########################################

	.CODE

start:

; open notepad and run this example to make notepad transparent



	mov cl, ProStackSize

@@: mov eax, [OFFSET ProStack + ecx*4 - 4]

    dec cl

    push eax

    jne @B



	call FindWindow

	mov 4[esp],eax

	mov 24[esp],eax

	push eax

	call GetWindowLong

	or 8[esp], eax

	call SetWindowLong

	call LoadLibrary

	mov 20[esp], eax

	push eax

	call GetProcAddress

	call eax

	call FreeLibrary

	call ExitProcess

END start

; ########################################