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

[Christophe]

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.