; stack.asm
; to get used to the stack, gets command line and prints it in messagebox

format PE GUI 4.0
include "win32axp.inc"

.data
_message db "Command line=%s", 0
_ok db "Did it work ok ?", 0

.code
start:
        push ebp        ; save ebp
        mov ebp, esp
        sub esp, 256    ; 256 chars
        mov esi, esp    ; save the address for later use

        call [GetCommandLine]
        ;invoke GetCommandLine

        push eax
        push _message
        push esi
        call [wsprintf]
; if i comment the next three "pops" it still works
        pop ebx
        pop ebx
        pop ebx
        ;cinvoke wsprintf, esi, _message, eax

        push MB_OK
        push NULL
        push esi
        push HWND_DESKTOP
        call [MessageBox]
        ;invoke MessageBox, HWND_DESKTOP, esi, NULL, MB_OK

        mov esp, ebp    ; restore stack pointer
        pop ebp

        invoke MessageBox, HWND_DESKTOP, _ok, NULL, MB_OK

        invoke ExitProcess, 0
.end start
        ; END
    

mov  eax, offset world
      push eax
      mov  eax, offset hello
      push eax
      mov  eax, offset format
      push eax
      call printf
      //clean up the stack so that main can exit cleanly
      //use the unused register ebx to do the cleanup
      pop  ebx
      pop  ebx
      pop  ebx
    

.code
start:
        mov ebp,_ok
        push ebp        ; save ebp
        mov ebp, esp 

        ...

        mov esp, ebp    ; restore stack pointer
        pop ebp

        invoke MessageBox, HWND_DESKTOP, ebp, NULL, MB_OK

        ...