.386
.model flat, stdcall
include H:\TASM\INCLUDE\WINDOWS.INC

extrn            CreateWindowExA:PROC
extrn            DefWindowProcA:PROC
extrn            DispatchMessageA:PROC
extrn            ExitProcess:PROC
extrn            GetMessageA:PROC
extrn            GetModuleHandleA:PROC
extrn            LoadCursorA:PROC
extrn            LoadIconA:PROC
extrn            PostQuitMessage:PROC
extrn            RegisterClassA:PROC
extrn            ShowWindow:PROC
extrn            TranslateMessage:PROC
extrn            UpdateWindow:PROC


.data

newhwnd          dd 0
msg              MSGSTRUCT   <?>
wc               WNDCLASS    <?>
hInst            dd 0
szTitleName      db 'Win32 Assembly Program',0
szClassName      db 'ASMCLASS32',0

.code
start:

        push    0
        call    GetModuleHandleA
        mov     [hInst], eax

        mov     [wc.clsStyle], CS_HREDRAW + CS_VREDRAW + CS_GLOBALCLASS

        mov     [wc.clsLpfnWndProc], offset WndProc

        mov     [wc.clsCbClsExtra], 0
        mov     [wc.clsCbWndExtra], 0

        mov     eax, [hInst]
        mov     [wc.clsHInstance], eax

        push    IDI_APPLICATION
        push    0
        call    LoadIconA
        mov     [wc.clsHIcon], eax

        push    IDC_ARROW
        push    0
        call    LoadCursorA
        mov     [wc.clsHCursor], eax

        mov     [wc.clsHbrBackground], COLOR_WINDOW + 1
        mov     dword ptr [wc.clsLpszMenuName], 0
        mov     dword ptr [wc.clsLpszClassName], offset szClassName

        push    offset wc
        call    RegisterClassA

        push    0
        push    [hInst]                  ; дискриптор окна
        push    0
        push    0
        push    CW_USEDEFAULT            ; высота
        push    CW_USEDEFAULT            ; ширина
        push    CW_USEDEFAULT            ; y
        push    CW_USEDEFAULT            ; x
        push    WS_OVERLAPPEDWINDOW      ; стиль
        push    offset szTitleName       ; заголовок окна
        push    offset szClassName       ; имя класса
        push    0                        ; дополнительный стиль

        call    CreateWindowExA

        mov     [newhwnd], eax

        push    SW_SHOWNORMAL
        push    [newhwnd]
        call    ShowWindow

        push    [newhwnd]
        call    UpdateWindow

msg_loop:
        push    0
        push    0
        push    0
        push    offset msg
        call    GetMessageA

        cmp     ax, 0
        je      end_loop

        push    offset msg
        call    TranslateMessage

        push    offset msg
        call    DispatchMessageA

        jmp     msg_loop

end_loop:

        push    [msg.msWPARAM]
        call    ExitProcess

WndProc          proc uses ebx edi esi, hwnd:DWORD, wmsg:DWORD,\
                 wparam:DWORD, lparam:DWORD

        cmp     [wmsg], WM_DESTROY
        je      wmdestroy

        push    [lparam]
        push    [wparam]
        push    [wmsg]
        push    [hwnd]
        call    DefWindowProcA
        jmp     finish

wmdestroy:
        push    0
        call    PostQuitMessage
        mov     eax, 0
finish:
        ret
WndProc          endp
ends
end start