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the code below is tutorial of iczelion,it create a son modeless dialog box of a window.my question is who process the message while the dialog box procude not processed.is DefWindowProc in parent window?if that how the message send to the parent window's procude?

thank you first .

.386

.model flat,stdcall

option casemap:none

include \masm32\include\windows.inc

include \masm32\include\user32.inc

include \masm32\include\kernel32.inc

includelib \masm32\lib\user32.lib

includelib \masm32\lib\kernel32.lib



WinMain proto :DWORD,:DWORD,:DWORD,:DWORD

DlgProc PROTO :HWND, :DWORD, :DWORD, :DWORD



.data

ClassName db "SimpleWinClass",0

AppName  db "Our Main Window",0

MenuName db "FirstMenu",0

DlgName db "MyDialog",0

TestString db "Hello, everybody",0

hwndDlg dd 0            ; Handle to the dialog box



.data?

hInstance HINSTANCE ?

CommandLine LPSTR ?



.const

IDM_EXIT equ 1

IDM_ABOUT equ 2

IDC_EDIT  equ 3000

IDC_BUTTON equ 3001

IDC_EXIT equ 3002



.code

start:

	invoke GetModuleHandle, NULL

	mov    hInstance,eax

	invoke GetCommandLine

	mov CommandLine,eax

	invoke WinMain, hInstance,NULL,CommandLine, SW_SHOWDEFAULT

	invoke ExitProcess,eax

WinMain proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD

	LOCAL wc:WNDCLASSEX

	LOCAL msg:MSG

	LOCAL hwnd:HWND

	mov   wc.cbSize,SIZEOF WNDCLASSEX

	mov   wc.style, CS_HREDRAW or CS_VREDRAW

	mov   wc.lpfnWndProc, OFFSET WndProc

	mov   wc.cbClsExtra,NULL

	mov   wc.cbWndExtra,NULL

	push  hInst

	pop   wc.hInstance

	mov   wc.hbrBackground,COLOR_WINDOW+1

	mov   wc.lpszMenuName,OFFSET MenuName

	mov   wc.lpszClassName,OFFSET ClassName

	invoke LoadIcon,NULL,IDI_APPLICATION

	mov   wc.hIcon,eax

	mov   wc.hIconSm,eax

	invoke LoadCursor,NULL,IDC_ARROW

	mov   wc.hCursor,eax

	invoke RegisterClassEx, addr wc

	INVOKE CreateWindowEx,WS_EX_CLIENTEDGE,ADDR ClassName,ADDR AppName,\

           WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\

           CW_USEDEFAULT,300,200,NULL,NULL,\

           hInst,NULL

	mov   hwnd,eax

	INVOKE ShowWindow, hwnd,SW_SHOWNORMAL

	INVOKE UpdateWindow, hwnd

	.WHILE TRUE

                INVOKE GetMessage, ADDR msg,NULL,0,0

                .BREAK .IF (!eax)

                .if hwndDlg!=0

                        invoke IsDialogMessage,hwndDlg,ADDR msg

                        .if eax==TRUE

                                .continue

                        .endif

                .endif

                INVOKE TranslateMessage, ADDR msg

                INVOKE DispatchMessage, ADDR msg

	.ENDW

	mov     eax,msg.wParam

	ret

WinMain endp

WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM

	.IF uMsg==WM_DESTROY

		invoke PostQuitMessage,NULL

	.ELSEIF uMsg==WM_COMMAND

		mov eax,wParam

		.if ax==IDM_ABOUT

			invoke CreateDialogParam,hInstance, addr DlgName,hWnd,OFFSET DlgProc,NULL

			mov hwndDlg,eax

		.else

			invoke DestroyWindow, hWnd

		.endif

	.ELSE

		invoke DefWindowProc,hWnd,uMsg,wParam,lParam

		ret

	.ENDIF

	xor    eax,eax

	ret

WndProc endp



DlgProc PROC hWnd:HWND,iMsg:DWORD,wParam:WPARAM, lParam:LPARAM

        .if iMsg==WM_INITDIALOG

		invoke GetDlgItem,hWnd,IDC_EDIT

		invoke SetFocus,eax

        .elseif iMsg==WM_CLOSE

		invoke EndDialog,hWnd,NULL

		mov hwndDlg,0

        .elseif iMsg==WM_COMMAND

		mov eax,wParam

		mov edx,eax

		shr edx,16

		.if dx==BN_CLICKED

			.if eax==IDC_EXIT

				invoke SendMessage,hWnd,WM_CLOSE,NULL,NULL

			.elseif eax==IDC_BUTTON

				invoke SetDlgItemText,hWnd,IDC_EDIT,ADDR TestString

			.endif

		.endif		   

        .else

		mov eax,FALSE

		ret

        .endif

        mov  eax,TRUE

        ret

DlgProc endp

end start