Question

I am trying to create a Windows Forms Application in Visual C++ 2010. I have saved some particular string in string variable “stat” like:

System::String ^stat = "sample string";

The problem is, I cannot write it to a text file using ofstream. When I try this:

if ( opstat == true ) // opstat is a bool variable
{
    ofstream outf("mytxt.txt",ios::app);
    outf << stat;
    outf.close();
}

Compiler returns an error:

error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'System::String ^' (or there is no acceptable conversion)

And a huge error that goes on forever like:

1>          D:\Development\Visual Studio 2010\VC\include\ostream(447): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]

What am I supposed to do here?

P.S. I have already included all necessary headers (or the ones I think are necessary) like string, fstream, istream, iomanip etc.

Answer 1

I think you have to convert System::String ^stat to std::string. See below link how to convert:

C++/CLI Converting from System::String^ to std::string