How would I retrieve the stdout error message of a system/shell command?

[Justin Whear]

Good point. It looks like shell throws if the return value is an error code 
(something other than 0 on Posix). It looks like dmd does return an error 
code on failed compilation, so redirecting to stdout won't work. Back to the 
pipes or file redirect then.


Christophe wrote:

> Justin Whear , dans le message (digitalmars.D.learn:29380), a écrit :
>> That'll work if you don't mind normal output being mixed with error
>> messages.
>> 
>> 
>> Timon Gehr wrote:
>> 
>>> On 09/08/2011 07:26 PM, Justin Whear wrote:
>>>> The Posix solution is to use pipes. Basically, you'll want the parent
>>>> process to set up a pipe for stderr, fork, then the child process uses
>>>> the write end of the stderr while the parent reads from the other end.
>>>> Not sure what the Windoze solution is.
>>>> Alternatively, the cheap and easy way is to use redirects:
>>>>
>>>> system("dmd bla.d 2>error.log");
>>>>
>>>> If an error is thrown, read from error.log.
>>> 
>>> I think the easiest way on a posix system is this:
>>> 
>>> auto res=shell("dmd bla.d 2>&1");
>>> 
>>> I haven't tested it tough. What it should do is redirect dmd's stderr to
>>> stdout, which can then be read.
>> 
> 
> Well, if shell throws, it will not return, and the output will not be
> assigned to res.