[Coco] Nitros9 and Set Status Call SS.AScrn

[Walter Zambotti]

Hi all Nitros9 programmers.

 

First of thanks to Bill for sending me the asm functions for creating a
window
and mapping the window into process address space. Works well (Bill)!

 

Now I am trying to do the same thing but by using the SS.AScrn set status
call.

 

I would like to use this because, if I'm reading the manual correctly, it
allocates
a window of a given size and resolution and maps it into the process address
in
one call!

 

The call is documented in the Nitros9 Tech Ref Manual page 236.

 

It states:

 

Screens must be allocated from a VDG-type device - a standard 32-column
text screen must be available for the device.  (Which Device??  Do they mean
the 
window!)

 

The support module for this call is VDGINT.

 

I am running the app from a 32 col CoVDG window.

 

Mdir shows CoVDG and GRFDRV are loaded and seven /W descriptors are loaded.

 

As the SS.AScrn call takes a screen type parameter I am assuming that there
is no
need to perform a dwset to the open window.

 

However I can successfully open the window and can successfully configure
and select the window
via the dwset (write to stdin of the window) method. But now I want to avoid
using this method
and use SS.AScrn instead.

 

In an attempt to tie the window to the 32 column VDG window I have also
closed stdin, stdout, 
stderr in the app and have dup'ed the window path into these three paths.

 

Can anyone shed any light on the SS.AScrn call?

 

Walter