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Re: Calling Ghostscript from BASIC

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In article <20b36f7d58.harriet@bazleyfamily.co.uk>,
   Harriet Bazley <harriet@bazleyfamily.co.uk> wrote:
> On 8 Jun 2020 as I do recall,
>           Rob Hemmings (News) wrote:

> > It is ages since I've been programming so apologies if this is a silly
> > question.
> > 
> > Is there a way to call GhostScript from inside a BASIC program and return
> > control to the BASIC program afterwards?  I've just tried invoking
> > GhostScript from a program using an OSCLI command but although
> > GhostScript then runs correctly it does not hand back control to the
> > BASIC program which just ends.  I think I understand why it is happening
> > but is there any way to get around it?
> > 
> Wimp_StartTask will launch a program from within BASIC, and will return
> the task handle in R0 if successful.

> SYS"Wimp_StartTask",cmd$ TO handle%


> In Infozip, in order to avoid freezing the desktop I launched the
> 'child' task in a taskwindow, recorded the task handle as child%, then
> listened in on Wimp_Poll for the Wimp message &400C3 (TaskCloseDown)
> being broadcast in order to detect when the child had finished.  This is
> a fairly crude approach which only allows for one child task to be
> running at a time.

Thanks Harriet, that is very helpful.

-- 
------------------------------------------------------------- 
 Rob Hemmings                        Southport       
 
 rhnews@dsl.pipex.com                  

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Thread

Calling Ghostscript from BASIC "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-08 15:22 +0100
  Re: Calling Ghostscript from BASIC Harriet Bazley <harriet@bazleyfamily.co.uk> - 2020-06-08 15:39 +0100
    Re: Calling Ghostscript from BASIC "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-08 15:44 +0100
    Re: Calling Ghostscript from BASIC Steve Fryatt <news@stevefryatt.org.uk> - 2020-06-08 16:19 +0100
      Re: Calling Ghostscript from BASIC Martin Wuerthner <spamtrap@mw-software.com> - 2020-06-08 20:22 +0200
        Re: Calling Ghostscript from BASIC Harriet Bazley <harriet@bazleyfamily.co.uk> - 2020-06-08 21:15 +0100
          Re: Calling Ghostscript from BASIC druck <news@druck.org.uk> - 2020-06-09 10:58 +0100
            Re: Calling Ghostscript from BASIC Harriet Bazley <harriet@bazleyfamily.co.uk> - 2020-06-09 15:09 +0100
              Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-13 13:01 +1200
                Re: Calling Ghostscript from BASIC druck <news@druck.org.uk> - 2020-06-13 12:03 +0100
                Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-14 01:29 +1200
        Re: Calling Ghostscript from BASIC "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-08 23:37 +0100
  Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-14 16:38 +1200
    Re: Calling Ghostscript from BASIC Steve Fryatt <news@stevefryatt.org.uk> - 2020-06-14 07:40 +0100
      Re: Calling Ghostscript from BASIC "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-14 08:48 +0100
      Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-14 20:27 +1200
        Re: Calling Ghostscript from BASIC Steve Fryatt <news@stevefryatt.org.uk> - 2020-06-14 10:01 +0100
          Re: Calling Ghostscript from BASIC Harriet Bazley <harriet@bazleyfamily.co.uk> - 2020-06-14 15:41 +0100
            Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-15 14:51 +1200
              Re: Calling Ghostscript from BASIC druck <news@druck.org.uk> - 2020-06-15 08:56 +0100
                Re: Calling Ghostscript from BASIC Ronald <gettingchoppy@gmail.com> - 2020-06-15 20:30 +1200
        Re: Calling Ghostscript from BASIC Harriet Bazley <harriet@bazleyfamily.co.uk> - 2020-06-14 15:44 +0100

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