;
;   MASMWIN.ASM
;   Brian Lieuallen
;   Copyright (c) 1991 Microsoft Corporation. All rights reserved.

.model    small,pascal
.286
.287

OPTION CASEMAP:NONE

include  windows.inc

?WINDOWS=1
include  winpro.inc

OPTION PROLOGUE:cPrologue
OPTION EPILOGUE:cEpilogue

WndProc        PROTO  FAR hwnd:HWND,message:WORD,wParam:WORD,lParam:DWORD
AboutBoxProc   PROTO  FAR hwnd:HWND,message:WORD,wParam:WORD,lParam:DWORD


ID_ICON     equ   1000

.data
localheaphead   db  16 dup (?)

szAppName   BYTE   'MasmWin',0
szTitle     byte   'A windows program in MASM',0
string1     byte   'Masm is great',0
string2     byte   'C is for wimps',0
about       byte   'ABOUT',0
menuname    byte   'GenericMenu',0
flag        word   0
hInst       word   ?
lpProcAbout dword  ?

extern    __acrtused:abs
.code

WinMain   PROC  uses si di, hInstance    :HANDLE,
                            hPrevInstance:HANDLE,
                            lpszCmdParam :LPSTR,
                            nCmdShow     :WORD

          LOCAL    hwnd     :HWND,
                   msg      :MSG,
                   wndclass :WNDCLASS


          cmp      hPrevInstance,0
          jne      dontregister

          mov      wndclass.style, CS_HREDRAW OR CS_VREDRAW

          mov      word ptr wndclass.lpfnWndProc,   offset WndProc
          mov      word ptr wndclass.lpfnWndProc+2, seg    WndProc

          mov      wndclass.cbClsExtra,0
          mov      wndclass.cbWndExtra,0

          mov      ax,hInstance
          mov      hInst,ax
          mov      wndclass.hInstance,ax


          INVOKE   LoadIcon, ax, ID_ICON
          mov      wndclass.hIcon,ax

          INVOKE   LoadCursor, 0,32512 ; IDC_ARROW
          mov      wndclass.hCursor,ax

          INVOKE   GetStockObject,WHITE_BRUSH
          mov      wndclass.hbrBackground,ax

          mov      word ptr wndclass.lpszMenuName,  offset menuname
          mov      word ptr wndclass.lpszMenuName+2,ds

          mov      word ptr wndclass.lpszClassName, offset szAppName
          mov      word ptr wndclass.lpszClassName+2, ds

          INVOKE   RegisterClass,ADDR wndclass

          or       ax,ax
          je       progexit

dontregister:

          INVOKE   CreateWindow, ADDR szAppName,
                                 ADDR szTitle,
                                 WS_OVERLAPPEDWINDOW,
                                 08000h,
                                 08000h,
                                 08000h,
                                 08000h,
                                 0,
                                 0,
                                 hInstance,
                                 0

          or       ax,ax
          je       progexit
          mov      hwnd,ax

          INVOKE   ShowWindow,hwnd,nCmdShow
          INVOKE   UpdateWindow,hwnd

messageloop:
          INVOKE   GetMessage,ADDR msg,NULL,0,0
          test     ax,ax
          je       progexit

          INVOKE   TranslateMessage,ADDR msg
          INVOKE   DispatchMessage,ADDR msg
          jmp      short  messageloop
          mov      ax,msg.wParam

progexit:
          ret

WinMain   endp




WndProc   PROC FAR EXPORT uses si di, hwnd    :HWND,
                                      message :WORD,
                                      wParam  :WORD,
                                      lParam  :DWORD

          LOCAL    hdc :HDC,
                   ps  :PAINTSTRUCT

          mov      ax,message

          cmp      ax,WM_CREATE
          jne      @f

            INVOKE   SetTimer,hwnd,1,1000,NULL
            jmp      Return0


@@:       cmp      ax,WM_TIMER
          jne      @f

            cmp      wParam,1
            jne      Return0

            test     flag,-1
            jne      settext1

            INVOKE   SetWindowText,hwnd,ADDR string1
            not      flag
            jmp      Return0
settext1:
            INVOKE   SetWindowText,hwnd,ADDR string2
            not      flag
            jmp      Return0


@@:       cmp      ax,WM_PAINT
          jne      @f

            INVOKE   BeginPaint,hwnd,ADDR ps
            mov      ax,hdc

            INVOKE   EndPaint,hwnd,addr ps
            jmp      Return0


@@:       cmp      ax,WM_KEYDOWN
          jne      @f

            jmp    Return0


@@:       cmp      ax,WM_COMMAND
          jne      @f
            cmp      wParam,200
            jne      @f
            mov      bx,offset AboutBoxProc
            INVOKE   MakeProcInstance, cs::bx,hInst
            mov      word ptr lpProcAbout,ax
            mov      word ptr lpProcAbout+2,dx
            INVOKE   DialogBox,hInst,ADDR about,hwnd,lpProcAbout
            INVOKE   FreeProcInstance,lpProcAbout
            jmp      Return0


@@:       cmp      ax,WM_DESTROY
          jne      @f
            INVOKE   PostQuitMessage,0
            jmp      Return0


@@:       INVOKE   DefWindowProc,hwnd,message,wParam,lParam
          jmp      ProcEnd

Return0:
          xor      ax,ax
          mov      dx,ax
ProcEnd:
          ret
WndProc   ENDP

AboutBoxProc   PROC FAR EXPORT uses si di, hwnd    :HWND,
                                           message :WORD,
                                           wParam  :WORD,
                                           lParam  :DWORD
          mov      ax,message

          cmp      ax,WM_INITDIALOG
          jne      @f

            jmp      Return0

@@:       cmp      ax,WM_COMMAND
          jne      @f

            mov      ax,wParam
            cmp      ax,100
            jne      Return0

              INVOKE  EndDialog,hwnd,1
              mov     ax,1
              jmp     ProcEnd


@@:
Return0:
          xor      ax,ax
          mov      dx,ax
ProcEnd:
          ret


AboutBoxProc   ENDP

          end