Can you redirect stdout and stderr to a string in C ?

Redirecting stdout/stderr to a String

Redirecting stdout and stderr to files is a common task, but can output to a string be achieved?

Answer:

Yes, it's possible to redirect stdout and stderr to an std::stringstream:

<code class="cpp">std::stringstream buffer;
std::streambuf * old = std::cout.rdbuf(buffer.rdbuf());

std::cout << "Bla" << std::endl;

std::string text = buffer.str(); // text will now contain "Bla\n"</code>

To ensure the buffer is always reset, a guard class can be used:

<code class="cpp">struct cout_redirect {
    cout_redirect( std::streambuf * new_buffer ) 
        : old( std::cout.rdbuf( new_buffer ) )
    { }

    ~cout_redirect( ) {
        std::cout.rdbuf( old );
    }

private:
    std::streambuf * old;
};</code>

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