[process] Couple of issues
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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Hi, 1. Use "bp::child c(bp::search_path("ping"), "127.0.0.1", "-t", bp::std_out 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.") J 2018-01-02 10:15 GMT+01:00 Sebastian Messerschmidt via Boost-users < 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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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@lists.boost.org <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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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@lists.boost.org>:
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@lists.boost.org <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
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org <mailto:Boost-users@lists.boost.org> https://lists.boost.org/mailman/listinfo.cgi/boost-users <https://lists.boost.org/mailman/listinfo.cgi/boost-users>
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Sebastian Messerschmidt