error in recording sounds with sdl

I write a program for learning english and I want to record sounds and my program didn't work at all I don't know why, this is the code:

#include <SDL.h>

#include <stdio.h>

#include <string>

#include <sstream>

//Recieved audio spec

SDL_AudioSpec gReceivedRecordingSpec;

SDL_AudioSpec gReceivedPlaybackSpec;

//Maximum recording time

const int MAX_RECORDING_SECONDS = 5;

//Maximum recording time plus padding

const int RECORDING_BUFFER_SECONDS = MAX_RECORDING_SECONDS + 1;

//Recording data buffer

Uint8* gRecordingBuffer = NULL;

//Size of data buffer

Uint32 gBufferByteSize = 0;

//Position in data buffer

Uint32 gBufferBytePosition = 0;

//Maximum position in data buffer for recording

Uint32 gBufferByteMaxPosition = 0 …