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

Subject: Re: [Boost-users] [process] Couple of issues
From: JF (krabicezpapundeklu_at_[hidden])
Date: 2018-01-02 11:06:28

Something like this works for me:

...
std::vector<std::string> args;

args.push_back("127.0.0.1");
args.push_back("-t");

bp::ipstream is;
bp::child c(bp::search_path("ping"), args, bp::std_out > is);
...

J

2018-01-02 11:59 GMT+01:00 Sebastian Messerschmidt via Boost-users <
boost-users_at_[hidden]>:

>
>
> 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()
>>     {
>>              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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>>
>>
>>
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