Need function similar to _dos_setvect

[Thomas Tierney]

Does anyone know of anything like this? the Dos Libs for Windows come with this function but I would then have to link to the lib file, which means I would have to write this program in C or C++.

Anyone know of an equivelent?

Thanks

[Michael Mattias]

Courtesy: Google search

MSC: void _dos_setvect( unsigned intnum,
void (interrupt far *handler)() )


- prototype in dos.h

- intnum = interrupt vector to set (0..255)
- handler = new interrupt routine

- Turbo C uses setvect()
- see INT 21,25 _dos_getvect()

If you are creating an MS_DOS program using PB/DOS (not shown), use CALL INTERRUPT for INT 21, whatever function SETS vectors (probably 24 or 26, since the GET is 25).

If you are creating a Windows program, what are you trying to do?

Setting interrupt vectors under MS-DOS was done to redirect certain system events such as keystrokes, mouse clicks, file opens, etc etc etc. But under Windows all 'user' actions are sent to your program in the form of notification message, and most of the others can be handled using some of the 'event services' provided.


MCM

[Thomas Tierney]

Under windows.

Background, when a dos program runs in windows the OS will load a DOS VM called NTVDM. NTVDM will then look to the OS for a registered handler for the Interrupt being called.

What I need to do is register a handler for &H14 (this is the FOSSIL Interrupt) and set the handler to the procedure that will be handling that interrupt.

[Michael Mattias]

Woo. Good Description.

But I'm afraid this one is WAAAAY beyond my pay grade....

[Thomas Tierney]

How about this, I think I can do it from PDDOS, it may be that the DOS forum is a good place for this but I need to mimic this call, but not sure how to do it

 push    ds              ;Move ds segment
        pop     es              ;  to es
        lea     si,DLLname      ;Point to our desired drivers DLL name
        lea     di,DLLinit      ;Point to the desired Init routine name
        lea     bx,DLLdisp      ;Point to the desired dispatch routine name
                                ;So now we have       Dispatch in ds:bx
                                ;                     Init     in es:di
                                ;  and                DLLname  in ds:si

        db 0C4h,0C4h,58h,0h     ;--Execute NTVDM RegisterModule-----
                                ;We should have invoked our DLL at this point
        lea     di,Handle       ;Address our handle location
        mov     [di],ax         ;Save the VDD handle sent back to us by NTVDM

        jnc     RgDone          ;Jump if we have a good VDD handle
        mov     ax,0
        mov     [di],ax         ;--ELSE we have a problem - probably no DLL----

[Thomas Tierney]

Got It For PB DOS

Dim sDll as string
Dim sInit as string
Dim sDispatch as string
Dim dllptr as word
Dim initPtr as word
Dim dispatchPtr as word
Dim hHandler as dword

sDll = "DLLNAME.DLL" & chr$(0)
sInit = "INITROUTINE" & chr$(0)
sDispatch = "DISPATCHROUTINE" & chr$(0)

dllPtr = varptr(sDll)
dllInit = varptr(sInit)
dllDispatch = varptr(sDispatch)

PRINT "RUNNING ASM"

ASM push es
ASM push ds
ASM pop es
ASM mov si, dllPtr
ASM mov di, dllInit
ASM mov bx, dllDispatch
'--- this calls the dll from here using special ntvdm opcode ----
ASM db &H0C4
ASM db &H0C4
ASM db &H58
ASM db &H0
ASM mov hHandler, AX

Select case hHandler
        case 0
              'okay
        case 1 
              'dll could not be found
        case 2
              'dispatch could not be found
        case 3 
              'init could not be found
        case 4
              'not enough memory
        case else
              'something blew up
End select