Can You Redirect Standard Output (stdout) and Standard Error (stderr) to a String in C ?

Redirecting stdout/stderr to a String

Many discussions have centered around redirecting stdout/stderr to a file. However, is it possible to redirect this output to a string?

Solution

Yes, redirection to an std::stringstream object is feasible:

<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 automatic reset of the buffer, consider using a guard class:

<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>

The above is the detailed content of Can You Redirect Standard Output (stdout) and Standard Error (stderr) to a String in C ?. For more information, please follow other related articles on the PHP Chinese website!