Date: Thu, 6 Nov 1997 12:38:30 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: "N. D. Culver" <ndc AT alum DOT mit DOT edu>
cc: djgpp AT delorie DOT com
Subject: Re: WIN95 and Alt Esc or Ctl Esc
In-Reply-To: <3460FE65.6D5E@alum.mit.edu>
Message-ID: <Pine.SUN.3.91.971106123806.4123S-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
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On Wed, 5 Nov 1997, N. D. Culver wrote:

> Is it possible to detect when the user types Alt Esc or Ctl Esc
> when running DJGPP in Dos Box full screen mode under WIN 95/NT?

Your description implies that you want something different: you want
to know, from within a running program, whether it was minimized and
then maximized again.  The keys that were used for that are NOT what
you are after.  Is that correct?

If it is, then I don't think Windows has an easily-used service for
that.  You might try two related services that I found by quickly
searching Ralf Brown's Interrupt List (see below).

One way to cope with this would be to provide a key to redisplay the
screen, which will also reload the palette.  Then the user could use
that feature after the window is restored.

You could also prevent Windows from intercepting these special keys,
by editing the properties of the DOS box.

--------W-2F1684BX7FE0-----------------------
INT 2F - MS Windows - VSWITCHD - GET API ENTRY POINT
	AX = 1684h
	BX = 7FE0h (virtual device ID for VSWITCHD device) (see #2329)
	ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #2402)
		  0000h:0000h if the VxD does not support an API

(Table 2402)
Call VSWITCHD entry point with:
	AX = function
	    0000h toggle windowed mode (simulate Alt-Enter keypress)
		Return: nothing
	    0001h get windowed mode
		Return: CF clear if VM is windowed
			CF set if VM is full-screen
SeeAlso: #2399,#2403

--------W-2F168B-----------------------------
INT 2F - MS Windows 3.1 - SET FOCUS TO SPECIFIED VIRTUAL MACHINE
	AX = 168Bh
	BX = virtual machine ID (see AX=1683h), 0000h for current DOS box
Return: AL = 00h if focus set to specified VM
Notes:	documented on the Microsoft Developer's Network CD-ROM
	if the VM is a windowed DOS box, it will be set to full screen
SeeAlso: AX=1683h
--------W-2F168C-----------------------------