format   pe gui
entry    start
include 'win32ax.inc'
;--------------
.data
ID_TRACK  =   1
hTrack    dd  0
buff      db  0
;--------------
.code
start:    invoke  InitCommonControls
          invoke  DialogBoxParam, 0, 100, 0, DialogProc, 0
          invoke  ExitProcess, 0
 
proc  DialogProc hwnddlg, msg, wparam, lparam
 
          cmp     [msg],WM_COMMAND
          je      @exit
          cmp     [msg],WM_CLOSE
          je      @close
          cmp     [msg],WM_INITDIALOG
          jne     @next
 
; WM_INITDIALOG
@init:
; Получить дескриптор контрола
          invoke  GetDlgItem,[hwnddlg],ID_TRACK    ;// ListView
          mov     [hTrack],eax
          jmp     @next
 
; WM_CLOSE/COMMAND"
@exit:    cmp     [wparam],BN_CLICKED shl 16 + IDCANCEL
          jne     @next
@close:   invoke  EndDialog,[hwnddlg], 0
@next:    xor     eax,eax
          ret
endp
;-------------
section '.idata' import data readable writeable
library  kernel32,'kernel32.DLL',user32,'user32.DLL',comctl32,'comctl32.dll'
include  'api\kernel32.inc'
include  'api\user32.inc'
include  'api\comctl32.inc'
;-------------
section '.rsrc' data resource readable
directory  RT_DIALOG, dialogs
resource   dialogs, 100, LANG_ENGLISH + SUBLANG_DEFAULT, mainform
 
dialog mainform,' TrackBar ',150,100,150,35, DS_3DLOOK++DS_SYSMODAL+WS_CAPTION+WS_SYSMENU,,,'Verdana',8
  dialogitem TRACKBAR_CLASS,'',ID_TRACK, 010,010,120,15,WS_VISIBLE+WS_BORDER
enddialog    

invoke SendMessage, [hTrack], TBM_SETRANGE, 1, 0x007F_0000

invoke SendMessage, [hTrack], TBM_GETPOS, 0, 0
mov [position], eax    

invoke wsprintf,zzzz,'%d',[position]
invoke MessageBoxTimeout,HWND_DESKTOP,zzzz,'',MB_TOPMOST,LANG_NEUTRAL,5000
    

How can I check result? Always zero, zero.. ?

; notification processing allows id use throughout lifecycle of controls
; updating several trackbar variables ...
.WM_NOTIFY:
        cmp [r9 + NMHDR.code], TRBN_THUMBPOSCHANGING
        jnz .default
        mov ecx, [r9 + NMHDR.idFrom]
        mov eax, [r9 + NMTRBTHUMBPOSCHANGING.dwPos]
        ; store the new position of moving slider
        mov [positions + (rcx-TRB_BASE)*4], eax
        xor eax, eax ; allow control to move
        retn