Re: Almost there on Win OS detection
From: Calm n Collected (spamtrap_at_crayne.org)
Date: 09/19/04
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Date: Sun, 19 Sep 2004 00:29:40 +0000 (UTC)
"Jim Carlock" <spamtrap@crayne.org> wrote in message news:<mnM2d.39824$uN5.1365@tornado.tampabay.rr.com>...
> Interrupt 2F, 160A does not put 0000 into AX on a WinXP
> Pro machine while running the program inside of debug.exe.
>
> A tmp.com with the program loaded reports that XP is NOT
> a Win32 system.
>
> AX retains 160A inside of it upon return from the int 2F. 2F
> does no visible changes to the registers. Of course, the debug
> program I'm using is the one that comes with XP, and it does
> NOT appear to support 32-bit registers.
>
> The code appears as follows inside the program, tmp.com:
> 0100 mov ax, cs
> 0102 mov ds, ax
> 0104 mov ax, 160a
> 0107 int 2f
> 0109 cmp ax, 0000
> 010C jnz 011F
> 010E cmp bh, 04
> 0111 jl 011F
> 0113 mov ah, 09
> 0115 mov dx, 031e
> 0118 int 21
> 011A mov ax, 4c00
> 011D int 21
> 011F mov ah, 09
> 0121 mov dx, 0300
> 0124 int 21
> 0126 mov ax, 4c01
> 0129 int 21
> 012B int 20
>
> a 300
> db "A Win32 OS is NOT present!!" 0a 0d "$"
> a 31e
> db "A Win32 OS is present." 0a 0d "$"
>
> I'm sure the first two lines aren't needed to run the program.
>
> --
> Jim Carlock
> http://www.microcosmotalk.com/
> Post replies to the newsgroup.
Could you try this. I think this is a better way. This also assembles OK under
ml 6.14 directly.
Thanks.
;=============================================================
; LFN.ASM Works fine up to Win2000 ,NT and XP not tested yet
; Code by Hutch
; This is a quick and dirty example of how to check for
; LFN support.
;
; ML /c LFN.ASM
; LINK16 LFN.OBJ;
;=============================================================
.model small
.stack
.data
buffer db 262 dup(0)
no db "no$"
support db "support",13,10,"$"
.code
.startup
; Set up and call the Windows 9x Long Filename Get
; Current Directory function. If the function is
; supported it will return with the carry flag clear.
; If the function is not supported (OSs prior to
; Windows 95 and Windows 9x MS-DOS mode), it will
; return with the carry flag set (and the value
; 7100h in AX).
mov ax,7147h
; DL = drive number (00h = current, 01h = A:, etc)
mov dl,0
; DS:SI -> buffer for ASCIZ directory name
mov si,offset buffer
; For compatibility with OSs prior to Windows 95 and
; Windows 9x MS -DOS mode, the carry flag should be
; set prior to the call.
stc
int 21h
jnc @F
mov ah,9
mov dx,offset no
int 21h
@@:
mov ah,9
mov dx,offset support
int 21h
; Wait for key press.
; mov ah,0
; int 16h
; cmp ah,1
.exit
end
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