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Very rusty programmer here

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  Very rusty programmer here Brian Jordan <brian.jordan9@btinternet.com> - 2019-10-06 23:31 +0100
    Re: Very rusty programmer here Sebastian Barthel <naitsabes@freenet.de> - 2019-10-07 03:05 +0000
    Re: Very rusty programmer here News <chrisjohnson@spamcop.net> - 2019-10-07 10:52 +0100

#5841 — Very rusty programmer here

Same rusty programmer - new problem...

I /think I know/ that it is possible to read a system variable and to use
the result within a BASIC program. After a fruitless evening with the PRM
I wonder if someone could drop me a hint?
For instance I know that, eg using *SHOW, I see that Alias$@RunType_B28
returns information that shows NetSurf has 'claimed' this file type
(URL). I am trying to find a way to get that information into a string in
BASIC. I hope that it is the syntax rather than the concept that is
eluding me. Any hints appreciated.
Thanks

-- 
_____________________________________________________________________

Brian Jordan
RISC OS 5.23 on Raspberry Pi
_____________________________________________________________________

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#5842

Am Sun, 06 Oct 2019 23:31:09 +0100 schrieb Brian Jordan:

> Same rusty programmer - new problem...
> 
> I /think I know/ that it is possible to read a system variable and to
> use the result within a BASIC program. After a fruitless evening with
> the PRM I wonder if someone could drop me a hint?

"OS_ReadVarVal" should do the trick ...


> For instance I know that, eg using *SHOW, I see that Alias$@RunType_B28
> returns information that shows NetSurf has 'claimed' this file type
> (URL). I am trying to find a way to get that information into a string
> in BASIC.

Probably there is another variant to do this by using the OSCLI command.
with
OSCLI "SHOW Alias$RunType_B28"
You can command BASIC to do the same thing as You did on the command line.

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#5843

In article <57feeb479bbrian.jordan9@btinternet.com>,
   Brian Jordan <brian.jordan9@btinternet.com> wrote:
> I /think I know/ that it is possible to read a system variable and
> to use the result within a BASIC program.

Yes. You need something on the lines of:

DIM block% 256
SYS"OS_ReadVarVal", "MyApp$Dir", block%, 256, 0, 3 TO ,,len%
block%?len% = 13 :REM Basic terminator
path$ = $(block%)

-- 
Chris Johnson

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