format PE GUI 4.0
entry start

include 'win32w.inc'

section '.data' data readable writeable

  _class	TCHAR 'FASMWIN32',0
  _btncls	TCHAR 'BUTTON',0
  _btntxt	TCHAR 'EXIT',0
  _btntxt2	TCHAR 'notEXIT',0
  _title	TCHAR 'Win32 program template',0
  _error	TCHAR 'Startup failed.',0
  _outfile	TCHAR 'out.txt',0

  wc WNDCLASS 0,WindowProc,0,0,0,0,0,COLOR_BTNFACE+1,0,_class

  msg	MSG
  hwnd	dd ?
  htest dd ?
  htest2 dd ?
  hfile	dd ?
  result dw ?
section '.code' code readable executable

  start:

	invoke	GetModuleHandle,0
	mov	[wc.hInstance],eax
	invoke	LoadIcon,0,IDI_APPLICATION
	mov	[wc.hIcon],eax
	invoke	LoadCursor,0,IDC_ARROW
	mov	[wc.hCursor],eax
	invoke	RegisterClass,wc
	test	eax,eax
	jz	error

	invoke	CreateWindowEx,0,_class,_title,WS_VISIBLE+WS_DLGFRAME+WS_SYSMENU,128,128,256,192,0,0,[wc.hInstance],0
	test	eax,eax
	jz	error

  msg_loop:
	invoke	GetMessage,msg,0,0,0
	cmp	eax,1
	jb	end_loop
	jne	msg_loop
	invoke	TranslateMessage,msg
	invoke	DispatchMessage,msg
	jmp	msg_loop

  error:
	invoke	MessageBox,0,_error,0,MB_ICONERROR+MB_OK

  end_loop:
	invoke	ExitProcess,[msg.wParam]

proc WindowProc hwnd,wmsg,wparam,lparam
	push	ebx esi edi
	cmp	[wmsg],WM_COMMAND
	je	.wmcommand
	cmp [wmsg],WM_CREATE
	je	.wmcreate
	cmp	[wmsg],WM_DESTROY
	je	.wmdestroy
	cmp [wmsg],WM_DROPFILES
	je	.wmdropfiles
  .defwndproc:
	invoke	DefWindowProc,[hwnd],[wmsg],[wparam],[lparam]
	jmp	.finish
  .wmcommand:
	mov eax,[htest]
	cmp	eax,[lparam]
	je .wmdestroy
	mov eax,[htest2]
	cmp	eax,[lparam]
	jne .finish
	invoke	MessageBox,0,0,0,MB_OK
	jmp .finish
  .wmcreate:
	invoke	CreateWindowEx,0,_btncls,_btntxt,WS_VISIBLE+WS_CHILD+BS_PUSHBUTTON,1,1,64,32,[hwnd],0,[wc.hInstance],0
	mov [htest],eax
	invoke	CreateWindowEx,0,_btncls,_btntxt2,WS_VISIBLE+WS_CHILD+BS_PUSHBUTTON,67,1,64,32,[hwnd],0,[wc.hInstance],0
	mov [htest2],eax
	jmp .finish
  .wmdestroy:
	invoke	PostQuitMessage,0
	xor	eax,eax
	jmp .finish
  .wmdropfiles:
	
  .finish:
	pop	edi esi ebx
	ret
endp

section '.idata' import data readable writeable

  library kernel32,'KERNEL32.DLL',\
	  user32,'USER32.DLL'

  include 'api\kernel32.inc'
  include 'api\user32.inc'