Re: [Boost-users] [process] Couple of issues

Subject: Re: [Boost-users] [process] Couple of issues
From: Sebastian Messerschmidt (sebastian.messerschmidt_at_[hidden])
Date: 2018-01-02 10:59:33

Am 02.01.2018 um 10:58 schrieb JF via Boost-users:
> Hi,
> 
> 1. Use "bp::child c(bp::search_path("ping"), "127.0.0.1", "-t", 
> bp::std_out > is);"

ok, that works. Thanks.
But how to pass a list of parameters? (e.g. obtained from a command line).

> 2. I'm on Windows, Boost 1.66, VS2017 and output is generated. (With 
> your original code: "Ping request could not find host 127.0.0.1 -t. 
> Please check the name and try again.")

I've explicitly stated "some applications" ;-) There are certain 
programs that seem to behave differently.

Cheers
Sebastian
> 
> J
> 
> 2018-01-02 10:15 GMT+01:00 Sebastian Messerschmidt via Boost-users 
> <boost-users_at_[hidden] <mailto:boost-users_at_[hidden]>>:
> 
>     Hi,
> 
>     I'm using boost 1.64 on Windows7 with VisualStudio 2015 64bit.
>     While testing boost.process I've encountered some issues that I'm
>     not able to resolve:
> 
>     1. Passing of multiple parameters:
> 
>     Consider this minimal example:
> 
>     <code>
>     void test_sync()
>     {
>      Â  Â  Â  Â  try
>      Â  Â  Â  Â  {
>      Â  Â  Â  Â  Â  Â  Â  Â  bp::ipstream is;
>      Â  Â  Â  Â  Â  Â  Â  Â  bp::child c(bp::search_path("ping"), "127.0.0.1
>     -t", bp::std_out > is);
>      Â  Â  Â  Â  Â  Â  Â  Â  std::string line;
>      Â  Â  Â  Â  Â  Â  Â  Â  while (c.running() && std::getline(is, line) &&
>     !line.empty())
>      Â  Â  Â  Â  Â  Â  Â  Â  {
>      Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  std::cerr << line << std::endl;
>      Â  Â  Â  Â  Â  Â  Â  Â  }
>      Â  Â  Â  Â  Â  Â  Â  Â  c.wait();
>      Â  Â  Â  Â  }
>      Â  Â  Â  Â  catch (const std::exception& e)
>      Â  Â  Â  Â  {
>      Â  Â  Â  Â  Â  Â  Â  Â  std::cerr << "Error in execution: " << e.what();
>      Â  Â  Â  Â  }
>     }
>     </code>
> 
>     This doesn't correctly execute "ping 127.0.0.1 -t", instead it will
>     act like "ping 127.0.0.1". I could not find an up2date example on
>     how to pass parameters correctly. Any ideas?
> 
>     2. No output on std::cout
>     It seems that some applications don't output to std::cout/clog/cerr
>     but somehow via printing to console directly (my guess as it is
>     colored output on windows)
>     In those instances, redirection fails. Can anyone think of a way to
>     still monitor the output of the spawned child?
> 
>     Cheers
>     Sebastian
> 
> 
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> 
> 
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