c++ - ofstream writing data to file: How do I pass a previously defined string as the filename -

c++ - ofstream writing data to file: How do I pass a previously defined string as the filename -

i have programme have written c++, opencv , qt, trying write info csv file. in qt widget have created qfiledialog allows me take save csv file.

this path stored qstring, , converted std::string follows;

std::string outputfilename = outputfile.toutf8().constdata();

i seek pass std::string ofstream::open function follows:

ofstream csvfile; csvfile.open(outputfilename);

and there lies problem; refuses compile, giving error

no matching function phone call 'std::basic_ofstream >::open(std::string&)'

i'm new programming , have no thought problem here. have tried looking @ this, can tell windows specific solution, , using osx.

can tell me how can pass filepath stored in qstring csvfile.open() term?

in c++03, ofstream::open takes const char* parameter.

if outputfilename std::string.

try:

csvfile.open(outputfilename.c_str());

if outputfilename qstring

csvfile.open(outputfilename.tostdstring().c_str());

see qstring::tostdstring reference

c++ string csv ofstream qstring