第一部分：

kd> kc

USER32!InternalCallWinProc
USER32!UserCallDlgProcCheckWow
USER32!DefDlgProcWorker
USER32!SendMessageWorker
USER32!InternalCreateDialog
USER32!InternalDialogBox
USER32!DialogBoxIndirectParamAorW
USER32!DialogBoxIndirectParamW
USER32!DialogBoxIndirectParamW_wrapper
comdlg32!NewGetFileName
comdlg32!NewGetSaveFileName
comdlg32!GetFileName
comdlg32!GetSaveFileNameW
NOTEPAD!NPCommand
NOTEPAD!NPWndProc
USER32!InternalCallWinProc
USER32!UserCallWinProcCheckWow
USER32!DispatchClientMessage
USER32!__fnDWORD
ntdll!KiUserCallbackDispatcher
nt!KiCallUserMode
nt!KeUserModeCallback
win32k!SfnDWORD
win32k!xxxSendMessageToClient
win32k!xxxSendMessageTimeout
win32k!xxxSendMessage
win32k!xxxTranslateAccelerator
win32k!NtUserTranslateAccelerator
nt!_KiSystemService
SharedUserData!SystemCallStub
ntdll!KiUserCallbackDispatcher
USER32!NtUserTranslateAccelerator
NOTEPAD!WinMain
NOTEPAD!WinMainCRTStartup
kernel32!BaseProcessStart

第二部分：

            //
// Do common dialog to save file
//

            if (GetSaveFileName(&OFN))
{

第三部分：

/* ** Notepad command proc - called whenever notepad gets WM_COMMAND
message.  wParam passed as cmd */
INT NPCommand(
HWND     hwnd,
WPARAM   wParam,
LPARAM   lParam )
{
HWND     hwndFocus;
LONG     lSel;
TCHAR    szNewName[MAX_PATH] = TEXT("");      /* New file name */
FARPROC  lpfn;
LONG     style;
DWORD    rc;
RECT     rcClient;

    switch (LOWORD(wParam))
{

        case M_SAVEAS:

            OFN.lpstrFile       = szNewName;
OFN.lpstrTitle      = szSaveCaption;
/* Added OFN_PATHMUSTEXIST to eliminate problems in SaveFile.
* 12 February 1991    clarkc
*/
OFN.Flags = OFN_HIDEREADONLY     | OFN_OVERWRITEPROMPT |
OFN_NOREADONLYRETURN | OFN_PATHMUSTEXIST   |
OFN_EXPLORER         |
OFN_ENABLESIZING     |
OFN_ENABLETEMPLATE   | OFN_ENABLEHOOK;

            OFN.lpTemplateName= TEXT("NpEncodingDialog");
OFN.lpfnHook= NpSaveDialogHookProc;

            /* ALL non-zero long pointers must be defined immediately
* before the call, as the DS might move otherwise.
* 12 February 1991    clarkc
*/
OFN.lpstrFilter       = szSaveFilterSpec;
OFN.lpstrDefExt       = TEXT("txt");

            if (!fUntitled)
{
lstrcpyn(szNewName, szFileName, MAX_PATH); /* set default selection */
}
else
{
lstrcpy (szNewName, TEXT("*.txt") );
}

            fInSaveAsDlg = TRUE;

            OFN.nFilterIndex= FILE_TEXT;

            //
// Do common dialog to save file
//

            if (GetSaveFileName(&OFN))
{