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

2 Jan 2018


      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 
mailto:boost-users@lists.boost.org>:
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()
    {
             try
             {
                     bp::ipstream is;
                     bp::child c(bp::search_path("ping"), "127.0.0.1
    -t", bp::std_out > is);
                     std::string line;
                     while (c.running() && std::getline(is, line) &&
    !line.empty())
                     {
                             std::cerr << line << std::endl;
                     }
                     c.wait();
             }
             catch (const std::exception& e)
             {
                     std::cerr << "Error in execution: " << e.what();
             }
    }
    </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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