Re: Execute an OS command and capture output

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On 2017-11-13 19:52, Victor Porton wrote:
> Dmitry A. Kazakov wrote:
> 
>> On 2017-11-13 17:38, Victor Porton wrote:
>>> I need a (preferably portable, but only Linux would be well) way to
>>> execute an OS command with some input in stdin which I provide and
>>> capture the output from stdout.
>>
>> It is a vague question because there are numerous methods of how the
>> input, output and error pipes are handled. E.g. by 0, 1, 2 tasks.
>>
>> Anyway see:
>>
>> 1. GNAT's System.OS_Lib.Spawn, System.OS_Lib.Non_Blocking_Spawn.
> 
> Where are docs for this? I sought Google but not found.

Only package specification AFAIK. But it is quite easy to understand 
because Spawn and Non_Blocking_Spawn are very low-level.

>> 2. A more comfortable method would be to use GTK bindings (GLib actually):
>>
>>      http://www.dmitry-kazakov.de/ada/gtkada_contributions.htm#10
> 
> I don't want my software to depend on GTK as it is Web based.

GTK is not Web-based. It is written in C.

> Is it possible to extract this code and use it separately?

Sources of GLib are freely available.

But it would be too complicated, especially under Windows were the GLib 
implementation uses a helper process.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de