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[kspr]

que tal si rediriges el buffer a un stringstream?

Código C++:

#include <iostream>
#include <fstream>
#include <sstream>
 
int main()
{
    std::stringstream buffer;
    std::streambuf * old = std::cout.rdbuf(buffer.rdbuf());
 
    std::cout << "hola mundo" << std::endl;
    std::cout << "hola mundo" << std::endl;
    std::cout << "hola mundo" << std::endl;
 
    std::string text = buffer.str();
 
    std::ofstream file;
    file.open ("test.txt");
    file << text;
    file.close();
}