Intercepting stdout into memory buffer

I require a snippet of code which will intercept all writes to stdout (via printf, cout, etc) and place? them in an expanding memory buffer, they must also continue on their way to the stdout stream as normal.? (Windows XP and Vista in C++) ## Deliverables I am looking for a snippet of code to use in a larger high-performance application that? (or its dynamically linked libraries) will occasionally send information to the console via printf and cout.? The code must intercept all writes to stdout and copy them into a memory buffer that expands automatically.? It must also allow the data to pass onto stdout as normal so a console (or? debugging IDE output screen), if present, will display the output. The application it will be embedded in is a windowed application and may not always be compiled as a console application.? The application must be able to display its own? console output within the application. I require this in C/C++ and must be compatible with both XP and Vista.? I will not accept any managed code (nothing? linking to? .NET in any way) or external libraries that are not supplied with both XP and Vista versions of Windows. I would like to see the memory buffer created and managed using Heaps. It must be provided as a simple application that demonstrates the above. It must only only what is provided in the Microsoft Platform SDK and compile in MSVC++ 2005.