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From: rommel@lan.informatik.tu-muenchen.dbp.de (Kai-Uwe Rommel)
Newsgroups: comp.windows.ms,comp.os.os2
Subject: Re: no-echo input
Message-ID: <2559@tuminfo1.lan.informatik.tu-muenchen.dbp.de>
Date: 31 May 90 11:21:44 GMT
References: <102@bohra.cpg.oz> <1584@ns-mx.uiowa.edu> <1990May30.192043.3281@watdragon.waterloo.edu>
Sender: news@lan.informatik.tu-muenchen.dbp.de
Reply-To: rommel@lan.informatik.tu-muenchen.dbp.de (Kai-Uwe Rommel)
Followup-To: comp.windows.ms
Organization: Inst. fuer Informatik, TU Muenchen, W. Germany
Lines: 32

>In article <102@bohra.cpg.oz> ejp@bohra.cpg.oz.au (Esmond Pitt) writes:
>>I asked this a while ago but apparently it didn't get transmitted upstream.
>>
>>Is it possible to accept input without echo (e.g. password fields) under:
>>
>>	(1) MS-Windows
>>	(2) PM
>>
>>and if so, how?
>I can give you a hint for Windows:

Under MS Windows I needed a password field with NO echo at all and used
window subclassing for it and it works fine. Change the callback
function for the edit control in the WM_INITDIALOG message and replace
it by your own which handles WM_CHAR itself and passes other messages to
the previous one (you have to remember the address of the original
callback function). The GetWindowLong() and SetWindowLong() calls are
used to replace the callback function's address and get the old one.
There is also a symbolic constant (don't heve it in mind) for the
parameter to these two calls for the callback function.

This should be possible for PM too, but I did not yet need it and
therefore did not try it but the MS-Windows solution works fine.

In the WM_CHAR message you can either replace the character by '*' or
'x' or whatever you want, remember the ortiginal character and pass the
'*' etc. to the original callback function or simply catch the WM_CHAR
and the edit control will stay empty all the time.

Kai Uwe Rommel
Munich
rommel@lan.informatik.tu-muenchen.dbp.de