Correct NASM build for Win98

[mcamember]

NASM 0.98.39 *seems* to build o.k. in Win98 (no errors)
but the executable crashes. RegisterClassEx and CreateWindowEx
return EAX=0. (The Demos which invoke CreateWindowEx don't work in Win98 either.)
Do I need an earlier version of NASM ?
Thanks in advance.

[nobody]

Ahhh, no you shouldn't need an earlier version of Nasm. 0.98.39 has been around a while. There *are* bugs in it, but not as you describe. You say you built it but "the executable crashes". Nasm crashes, or the executable you assembled with Nasm crashes? Sounds like the latter, when you mention what RegisterClassEX and CreateWindowEX return. Which demo(s) are we talking about? Where does it crash?

You might need different demos, you might need to do something different (what command line? for example), you *probably* don't need a different version of Nasm. Remotely possible that downloading the pre-compiled executable would help, but I doubt it.

Tell us more about exactly what you did to get this crash...

Best,
Frank

[mcamember]

Hi Frank,
The applications crash -  NOT NASM.

During compile NASM reports no errors.

Both my app and the demo file were compiled in Win98
using 0.98.39.

( Both my project and DEMO3 compile and run correctly
in Win2kPro but neither one runs correctly in Win98
*regardless* of the OS used to compile it.)

The demo is \DEMOS\WIN32\DEMO3\DEMO3.ASM.
I built the executable using its own DEMO3.BAT.

When the app is run, there's only a brief flash of what
 *might* be the titlebar and then it disappears. The biggest
problem, however, is that the app stays in memory and needs
to be removed manually by CTL/ALT/DEL - KillProcess.

The above is true for both my application and the
DEMO3.ASM file.

However, for DEMO3.EXE the debugger (OLLYDBG v1.07a) reports an error when loading -

"Module 'DEMO3' has entry point outside the
          code (as specified in the PE header). Maybe
          this file is self-extracting or self-modifying.
          Please keep it in mind when setting the break-
          points."

During debug, OLLY  reports  no red-flagged error messages
but both functions (RegisterClassEx and CreateWindowEx)
return zero in EAX (no class identifier ATOM for RegisterClassEx
and no window handle for CreateWindowEx).

I took screenshots of the Olly debugger at various stages but
the only way I knew to save them was via Wordpad. Will Wordpad
screens upload correctly to the forum ? And if so, would they
help ? They're very big in .doc format.
;------------------------------------------------------------------

I'm sorry for the lack of information in the first post. My
usual fault is the opposite - I write a novel where a sentence
would suffice.
I figured that I was doing something so * obviously * stupid that it would be a red flag to you guys immediately.

Thanks for the attention to all of this.
Austin

[mcamember]

Sorry. I forgot to include the source for DEMO3.ASM

DEMO3.ASM
;-------------------------------------------------------------------
%include '..\..\..\inc\win32\windows.inc'
%include '..\..\..\inc\win32\kernel32.inc'
%include '..\..\..\inc\win32\user32.inc'
%include '..\..\..\inc\nasm32.inc'

entry    demo3

[section .code]
proc    demo3

invoke   GetModuleHandleA, dword NULL
    mov      [hInstance], eax
    invoke   WinMain, dword hInstance, dword NULL, dword NULL, dword SW_SHOWNORMAL
    invoke   ExitProcess, dword NULL
    ret

endproc

proc    WinMain
hinst    argd        ; Current instance handle
hpinst   argd        ; Previous instance handle
cmdln    argd        ; Command line arguments
dwshow   argd        ; Display style

invoke   LoadIconA, dword NULL, dword IDI_APPLICATION
    mov      edx, eax
    mov      eax, dword argv(hinst)
    mov      ebx, dword szClass
    mov      ecx, dword WndProc
    mov      [wc + WNDCLASSEX.hInstance], eax
    mov      [wc + WNDCLASSEX.lpszClassName], ebx
    mov      [wc + WNDCLASSEX.lpfnWndProc], ecx
    mov      [wc + WNDCLASSEX.hIcon], edx
    mov      [wc + WNDCLASSEX.hIconSm], edx

invoke   RegisterClassExA, dword wc

invoke   CreateWindowExA, dword WS_EX_TOOLWINDOW, dword szClass, dword szTitle, dword WS_CAPTION + WS_SYSMENU + WS_VISIBLE, dword 100, dword 120, dword 100, dword 50, dword NULL, dword NULL, dword [wc + WNDCLASSEX.hInstance], dword NULL
    mov      [hWnd], eax

invoke   ShowWindow, dword hWnd, dword argv(dwshow)
    invoke   UpdateWindow, dword hWnd

.msgloop:
        invoke   GetMessageA, dword message, dword NULL, dword NULL, dword NULL
        cmp      eax, dword 0
        je       .exit
        invoke   TranslateMessage, dword message
        invoke   DispatchMessageA, dword message
        jmp      .msgloop
    .exit:

mov      eax, dword [message + MSG.wParam]
    ret

endproc

proc    WndProc
hwnd    argd        ; Window handle
umsg    argd        ; Window message
wparam  argd        ; wParam
lparam  argd        ; lParam


.wm_create:
    cmp      argv(umsg), dword WM_CREATE
    jnz      .wm_command

invoke   GetClientRect, dword argv(hwnd), dword rct
    invoke   CreateWindowExA, dword NULL, dword szButton, dword szString, dword WS_CHILD + WS_VISIBLE, dword 0, dword 0, dword [rct + RECT.right], dword [rct + RECT.bottom], dword argv(hwnd), dword 500, dword [wc + WNDCLASSEX.hInstance], dword NULL
    jmp      .wm_default

.wm_command:
    cmp      argv(umsg), dword WM_COMMAND
    jnz      .wm_destroy

cmp      argv(wparam), dword 500
    jne      .wm_default

invoke   MessageBoxA, dword NULL, dword szContent, dword szTitle, dword MB_OK
    jmp      .exit

.wm_destroy:
    cmp      argv(umsg), dword WM_DESTROY
    jnz      .wm_default

invoke   PostQuitMessage, dword NULL

.wm_default:
    invoke   DefWindowProcA, dword argv(hwnd), dword argv(umsg), dword argv(wparam), dword argv(lparam)

.exit:
    ret

endproc

[section .bss]
    hInstance:   resd 1
    hWnd:        resd 1

[section .data]
    szButton:   db    "BUTTON", 0x0
    szString:   db    "Click Me!", 0x0
    szContent:  db    "Win32Nasm Demo #3", 0x0
    szTitle:    db    "Demo3", 0x0
    szClass:    db    "Demo3Class", 0x0

wc:
    istruc WNDCLASSEX
        at WNDCLASSEX.cbSize,           dd    WNDCLASSEX_size
        at WNDCLASSEX.style,            dd    CS_VREDRAW + CS_HREDRAW
        at WNDCLASSEX.lpfnWndProc,      dd    NULL
        at WNDCLASSEX.cbClsExtra,       dd    NULL
        at WNDCLASSEX.cbWndExtra,       dd    NULL
        at WNDCLASSEX.hInstance,        dd    NULL
        at WNDCLASSEX.hIcon,            dd    NULL
        at WNDCLASSEX.hCursor,          dd    NULL
        at WNDCLASSEX.hbrBackground,    dd    COLOR_BTNFACE + 1
        at WNDCLASSEX.lpszMenuName,     dd    NULL
        at WNDCLASSEX.lpszClassName,    dd    NULL
        at WNDCLASSEX.hIconSm,          dd    NULL
    iend

message:
    istruc MSG
        at MSG.hwnd,                    dd    NULL
        at MSG.message,                 dd    NULL
        at MSG.wParam,                  dd    NULL
        at MSG.lParam,                  dd    NULL
        at MSG.time,                    dd    NULL
        at MSG.pt,                      dd    NULL
    iend

rct:
    istruc RECT
        at RECT.left,                   dd    NULL
        at RECT.top,                    dd    NULL
        at RECT.right,                  dd    NULL
        at RECT.bottom,                 dd    NULL
    iend

;--------------------------------------------------------
Austin