[boost-users] [program options]
HI how would I use program options to accept multiple input. Example I have a diffieHellmanKeyExchange program running through command prompt. // begin main program #include <iostream> #include <boost/tuple/tuple_io.hpp> #include <boost/program_options.hpp> #include "cppdef/BitOperation.cpp" #include "cppdef/mathfunc.cpp" #include "cppdef/IsPrime.cpp" #include "cppdef/DiffieHellman.cpp" #include <BigInteger.hpp> #include <BigIntegerUtils.hpp> int main( int ac, char* av[] ) { namespace po = boost::program_options; po::options_description desc("Allowed options"); boost::tuple<BigInteger, BigInteger> key_pair; desc.add_options() ("generate", "generates a pair of key") ("secert", po::value(&key_pair), "creates the share secret key"); po::variables_map vm; po::store(po::parse_command_line(ac, av, desc), vm); po::notify(vm); if (vm.count("generate")) { BigInteger my_prime = encryptcpw::random_prime<BigInteger>(&algocpw::Miller_Rabin<BigInteger>, 10); std::cout << "my prime: " << my_prime << "\n"; boost::tuple<BigInteger, BigInteger> pare(encryptcpw::dh_init<BigInteger>( my_prime )); std::cout << "pair of generated number: " << pare << "\n"; } if (vm.count("secert")) { const BigInteger p( encryptcpw::random_prime<BigInteger>(&algocpw::Miller_Rabin<BigInteger>, 10)); std::cout << encryptcpw::dh_secret<BigInteger>( p, boost::tuples::get<0>(key_pair), boost::tuples::get<1>(key_pair)); } } // end program The thing compiles but when I do DiffieHellman.exe --secert 817 697 I get this error. C:\CPW\cs_classes>DiffieHellmanEncrypt --secert 817 697 terminate called after throwing an instance of 'boost::program_options::invalid_ option_value' what(): in option 'secert': invalid option value '817' This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information.
One more addition: boost::tuple<BigInteger, BigInteger> key_pair; This will not parse your key. You need to do it manually. So your param should be std::string. And than you can tokenize you string. Or you define 2 separate params and let program_options parse them into Integers for you. But I am unsure if this is supported. Probably yes. I am 100% sure program options will not tokenize one param for you. May be only if your key_pair supports construction from a space separted string. Regards, Ovanes On 10/31/07, Ovanes Markarian <om_boost@keywallet.com> wrote:
You can use something like this as well. std::vector<std::string> key_pair; ("secert", boost::program_options::value< std::vector<std::string>
(&key_pair), "creates the share secret key");
Then you can do you error checks ... if ( key_pair.size() == 2 ) { // Do your processing here } else { // error } This example uses string vector. I guess std::vector<BigInteger> should also work for you. Thanks, Edwin On 10/31/07, Ovanes Markarian <om_boost@keywallet.com> wrote:
The problem is that your user still has to enter the keys like: appname.exe --key="public key" --key="secret key" And if the user enters: appname.exe --key="secret key" --key="public key" How do you know which is the right one? The best solution would be to enforce to specify public and secret params: appname.exe public="public key" secret="secret key" The last point also applies to my previous post. This way you will avoid some errors for your users. Best Regards, Ovanes On 11/2/07, Edwin Savarimuthu <zerobook@gmail.com> wrote:
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chun ping wang -
Edwin Savarimuthu -
Ovanes Markarian