I still don't understand，could you please figure it out？thanks.
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发件人：Olivier Tristan
Those following lines from your code should give you a hint
if (child2) { child2.get().put_value(strValue); } else { child2.get().put_value(strValue); }
Le 19/12/2013 12:34, 王郁槐 a écrit :
Could anyone help? Why the below code will crash on the below line? I'm using the boost property_tree. Thanks.
child1.get().put(sub_field, strValue);
========================================================= #include <fstream> #include
#include #include #include #include void writeConfig(const std::string &field, const std::string &sub_field, const std::string & strValue) { if (!boost::filesystem::exists(prog_cfg_file)) { std::ofstream ofIniConfig(prog_cfg_file, std::ofstream::out|std::ofstream::app); ofIniConfig.close(); }
boost::property_tree::ptree pt; boost::property_tree::ini_parser::read_ini(prog_cfg_file, pt); boost::optionalboost::property_tree::ptree& child1 = pt.get_child_optional(field);
if (child1) { boost::optionalboost::property_tree::ptree& child2 = child1.get().get_child_optional(sub_field);
if (child2) { child2.get().put_value(strValue); }else { child2.get().put_value(strValue); } }else { child1.get().put(sub_field, strValue); }
boost::property_tree::ini_parser::write_ini(prog_cfg_file, pt); }
int main() { writeConfig("test", "a", "OK"); return 0; }
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