SDL_mixer PAUSE | GameDev.net

I tried to learn a little about the SDL_mixer library. Here's a small code in which you can play effects with 1,2,3,4. Music with 9, and pausing the Music also with 9. But the pause doesn't work, and I don't know why. Can you help me? I marked the critical block.


#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include "SDL/SDL_mixer.h"
#include <iostream>
#include <string>
using namespace std;

//Variables
const short SCREEN_WIDTH    = 640;
const short SCREEN_HEIGHT   = 480;
const short SCREEN_BPP      = 32;
SDL_Surface *screen         = NULL;
SDL_Surface *background     = NULL;
SDL_Event event;
TTF_Font *font              = NULL;
bool quit                   = false;
Mix_Music *music    = NULL;
Mix_Chunk *scratch  = NULL;
Mix_Chunk *high     = NULL;
Mix_Chunk *med      = NULL;
Mix_Chunk *low      = NULL;

//Functions
bool Init();
bool loadFiles();
void cleanUp();


int main(int argc, char *args[])
{
    if(Init() == false)
    {
        return 1;
    }

    if(loadFiles() == false)
    {
        return 2;
    }

    while(quit == false)
    {
        while(SDL_PollEvent(&event))
        {
            if(event.type == SDL_QUIT)
            {
                quit = true;
            }

            if(event.type == SDL_KEYDOWN)
            {
                if(event.key.keysym.sym == SDLK_1)
                {
                    if(Mix_PlayChannel(-1, scratch, 0) == -1)
                    {
                        return 1;
                    }
                }

                else if(event.key.keysym.sym == SDLK_2)
                {
                    if(Mix_PlayChannel(-1, high, 0) == -1)
                    {
                        return 1;
                    }
                }

                else if(event.key.keysym.sym == SDLK_3)
                {
                    if(Mix_PlayChannel(-1, med, 0) == -1)
                    {
                        return 1;
                    }
                }

                else if(event.key.keysym.sym == SDLK_4)
                {
                    if(Mix_PlayChannel(-1, low, 0) == -1)
                    {
                        return 1;
                    }
                }

                else if(event.key.keysym.sym == SDLK_9)
                {
                    if(Mix_PlayingMusic() == 0)
                    {
                        if(Mix_PlayMusic(music, -1) == -1)
                        {
                            return 1;
                        }
                    }
                    else                                // HERE
                    {                                   // HERE
                        if(Mix_PausedMusic() == 1)      // HERE
                        {                               // HERE
                            Mix_ResumeMusic();          // HERE
                        }                               // HERE
                        else                            // HERE
                        {                               // HERE
                            Mix_PauseMusic();           // HERE
                        }                               // HERE
                    }                                   // HERE    
                }

                else if(event.key.keysym.sym == SDLK_0)
                {
                    Mix_HaltMusic();
                }
            }
        }
    }



    cleanUp();

    return 0;
}

bool Init()
{
    if(SDL_Init(SDL_INIT_EVERYTHING) == -1)
    {
        return false;
    }

    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);
    if(screen == NULL)
    {
        return false;
    }

    if(TTF_Init() == -1)
    {
        return false;
    }

    if(Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 4096) == -1 )
    {
        return false;
    }

    return true;
}

bool loadFiles()
{
    background = IMG_Load("back.bmp");
    if(background == NULL)
    {
        return false;
    }

    font = TTF_OpenFont("augie.ttf",26);
    if(font == NULL)
    {
        return false;
    }

    music = Mix_LoadMUS("starwars.mid");
    if(music == NULL)
    {
        return false;
    }

    scratch = Mix_LoadWAV("beep.wav");
    high    = Mix_LoadWAV("beeplow.wav");
    med     = Mix_LoadWAV("Kling.wav");
    low     = Mix_LoadWAV("schuss3.wav");

    if((scratch == NULL) || (high == NULL) || (med == NULL) || (low == NULL))
    {
        return false;
    }

    return true;
}

void cleanUp()
{
    SDL_FreeSurface(background);

    Mix_FreeChunk(scratch);
    Mix_FreeChunk(high);
    Mix_FreeChunk(med);
    Mix_FreeChunk(low);
    Mix_FreeMusic(music);
    Mix_CloseAudio();

    TTF_Quit();
    SDL_Quit();
}

Thanks Stromberg

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