atari basic XIO address handling

[danwinslow]

So, I'm trying to pass an address of a string variable in an XIO command, like so :

 

10 DIM A$(64)

20 XIO 13,#2,0,0,ADR(A$)

 

The number I am getting in bytes 4 and 5 of the IOCB is *not* the address of the variable. It points to a spot that has what looks like a second pointer to someplace sorta close to the variable, but about 200 bytes or so earlier.

 

Anybody have any clues?

[danwinslow]

gah, never mind, thats a string argument obviously. Perhaps if I just passed the string.

[Rybags]

I don't think XIO works "properly" as in the way it sets up buffer length for the CIO call.

I can remember trying to use it in a copy program but having to resort to asm routines via USR calls.

 

For the straightforward stuff though like doing Dos rename and other commands it shoud be OK.