c++ - Error : no instance of overloaded function -

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i'm trying insert lines in database (sql server 2008) code :

cdb.cpp

#include "cdb.h"  void cdb::ajouteralerte(){     sqlconnection      ^ mysqlconnection;     sqldataadapter     ^ mydataadapter;     dataset            ^ mydataset;     datarow            ^ myrow;     sqlparameter       ^ myparameter;      try     {         mysqlconnection = gcnew sqlconnection("data source=nectarys-pc;initial catalog=monitoringn;integrated security=true;");         mydataadapter = gcnew sqldataadapter();         mydataset = gcnew dataset();          // open connection         mysqlconnection->open();          mydataadapter->selectcommand = gcnew sqlcommand("select * alerte", mysqlconnection);         mydataadapter->insertcommand = gcnew sqlcommand("insert alerte (motif,datealerte," +             "fixee,nomposte,nomapplication,nomfichier,fichiermodel_id) values (@motif,@datealerte," +             "@fixee,@nomposte,@nomapplication,@nomfichier,@fichiermodel_id)", mysqlconnection);          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@motif", sqldbtype::varchar));         myparameter->sourcecolumn = "motif";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@datealerte", sqldbtype::varchar));         myparameter->sourcecolumn = "datealerte";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@fixee", sqldbtype::bit));         myparameter->sourcecolumn = "fixee";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@nomposte", sqldbtype::varchar));         myparameter->sourcecolumn = "nomposte";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@nomapplication", sqldbtype::varchar));         myparameter->sourcecolumn = "nomapplication";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@nomfichier", sqldbtype::varchar));         myparameter->sourcecolumn = "nomfichier";         myparameter->sourceversion = datarowversion::current;          myparameter = mydataadapter->insertcommand->parameters->add(             gcnew sqlparameter("@fichiermodel_id", sqldbtype::int));         myparameter->sourcecolumn = "fichiermodel_id";         myparameter->sourceversion = datarowversion::current;          time_t = time(0);         tm ltm;         localtime_s(&ltm, &now);         std::stringstream str;         str << ltm.tm_mday             << "/"             << 1 + ltm.tm_mon             << "/"             << 1900 + ltm.tm_year             << " "             << 1 + ltm.tm_hour             << ":"             << 1 + ltm.tm_min             << ":"             << 1 + ltm.tm_sec;         string^ dateajoutsysteme = gcnew system::string(str.str().c_str());          boolean fixee = true;          mydataadapter->fill(mydataset, "alerte");         myrow = mydataset->tables["alerte"]->newrow();         myrow->itemarray[0] = "a";         myrow->itemarray[1] = dateajoutsysteme;         myrow->itemarray[2] = fixee;         myrow->itemarray[3] = "b";         myrow->itemarray[4] = "c";         myrow->itemarray[5] = "d";         myrow->itemarray[6] = null;         mydataset->tables["alerte"]->rows->add(myrow);          //we use insertcommand property update.         mydataadapter->update(mydataset, "alerte");     }     catch (exception ^ e) {         console::write(e->tostring());     }     __finally {         mysqlconnection->close();         system("pause");     } }  liststr cdb::getlisteappsmetiers(){      sqlconnection      ^ mysqlconnection;     sqlcommand         ^ mysql;     sqldatareader      ^ myreader;     sqldataadapter     ^ mydataadapter;     dataset            ^ mydataset;     datarow            ^ myrow;     sqlparameter       ^ myparameter;      liststr::iterator i;     liststr            listeappsmetiers;      try     {         mysqlconnection = gcnew sqlconnection("data source=nectarys-pc;initial catalog=monitoringn;integrated security=true;");         mysql = gcnew sqlcommand("select * appmetier", mysqlconnection);          mysqlconnection->open(); // open connection         myreader = mysql->executereader();          while (myreader->read())             listeappsmetiers.insert(listeappsmetiers.end(), myreader["chemin"]->tostring()); // error marked @ point, before insert(...          return listeappsmetiers;     }     catch (exception ^ e)     {         console::write(e->tostring());     }     __finally     {         myreader->close();         mysqlconnection->close();     } }

cdb.h

#using <mscorlib.dll> #using <system.dll> #using <system.data.dll> #using <system.xml.dll>  #pragma warning (disable:4786) #include <list> #include <sstream> #include <time.h> #include <string> #include <iostream> #include <tchar.h>  using namespace system; using namespace system::data; using namespace system::xml; using namespace system::data::sqlclient;  typedef std::list<std::string> liststr;  class cdb{     cdb(){} //ctor     virtual ~cdb(){}  public:     void ajouteralerte(){}     liststr getlisteappsmetiers(){} };

but, i've got errors on marked line , haven't found how fix them :

no instance of overloaded function "std::list<_ty, _alloc>::insert[with _ty=std::string, _alloc=std::allocator]" matches argument list argument types : (std::_list_iterator>>, system::string ^) object type is: liststr

any brilliant idea, please ?

as explained in comments above: you're trying insert value myreader["chemin"]->tostring(), of microsoft-invented type string^, list of normal std::strings. there's no implicit conversion between microsoft string , std::string; you'll have conversion explicitly.

luckily there clr library function this: marshal_as.

#include <msclr/marshal_cppstd.h>  ...  while (myreader->read()) {     listeappsmetiers.insert(         listeappsmetiers.end(),         msclr::interop::marshal_as<std::string>( myreader["chemin"]->tostring() )); }

the code in answer copied @sriwantha-attanayake's answer similar question: https://stackoverflow.com/a/8896629/1424877


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