How to redirect streams stdout and stderr (Multiplatform)?

Question

I am writing a GL application that uses external libraries that print errors on the console. I want to catch this and print it in the game console.

PS: Sorry for my bad English ....

Answer 1

There are two main approaches you could take to do this:

• If all libraries use std::cout for the IO you want to capture, you can write your own basic_streambuf . Then you can just call std::cout.rdbuf(mybufinst); to replace a stream buffer, for example, using std::basic_stringbuf :

   #include <sstream> #include <iostream> int main() { static std::basic_stringbuf<std::ostream::char_type> buf; std::cout.rdbuf(&buf); std::cout << "Hello captured world!\n"; std::cerr << "Stole: " << buf.str() << std::endl; } 

• You can use a platform-specific approach, for example. on POSIX systems, dup2() allows you to replace the file descriptor with another or on Windows with SetStdHandle() . You would like to use channels, not just another file, probably, and you need to be very careful in blocking (so you probably need to allocate a dedicated stream)