c++ - QT ofstream use variable as a path name -

i'm trying make function takes qstring int. convert qstring variable filename ofstream, take integer , place file. far have managed take constant filename such "filename.dat" , write variable it. when try use qstring :

void write(const char what,int a){     std::ofstream writefile;     writefile.open("bin\\" + what);     writefile << a;     writefile.close(); } 

i error

void write(const char,int)': cannot convert argument 1 'const char [5]' 'const char 

this function calls write();

void server::on_dial_valuechanged(int value) {     write("dial.dat",value); } 

when use "bin\dial.dat" instead of combining "bin\" string works fine. ofstream.open(); uses "const char*".

i've tried filetypes may not match description

the question is- have idea how combine "bin\" , qstring , make work ofstream? i've spend lot of time googling still can't make work. thanks! suggestions more welcome

void write(const char what,int a) wrong pass 1 char function should have void write(const char* what,int a) pass pointer cstring beginning.

you want concat 2 cstrings , in c++ can't in other languages can use std::string want.

try this

#include <string>  void write(const char* what,int a){     std::ofstream writefile;     std::string filename("bin\\");     filename+=what;     writefile.open(filename.c_str());     writefile << a;     writefile.close(); }