Dll with Classes - How and How In AutoIt

[Mason]

I created a FMOD wrapper quite some time ago, and never put it to use due to the fact that I have no intention of learning the win32 API in C++, or any slow alternative (*cough* MFC *cough*). Anyhow, this is an example of what the code looks like...(cut some of it out so it doesn't take up a few pages, if needed, I will add it back in.)

Audio.h

#ifndef _AUDIO_H
#define _AUDIO_H

#include <FMOD.h>
#include <cstring>

#define AUDIO_TYPE_MP3 101
#define AUDIO_TYPE_WAV 102
#define AUDIO_TYPE_OGG 103
#define AUDIO_TYPE_MIDI 104

class Audio
{
    public:
        Audio();
        ~Audio();
        bool LoadAudio(char* fileName);
        bool ClearAudio();
        bool PlayAudio();
        bool StopAudio();
        bool PauseAudio(bool paused);
        bool SetVolume(int volume);
    private:
        bool *isMusicLoaded;
        int *audioType;
        FSOUND_STREAM *streamHandle;
        FMUSIC_MODULE *musicHandle;
};

#endif

Audio.cpp

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#include "Audio.h"

Audio::Audio()
{
    musicHandle = NULL;
    streamHandle = NULL;
    isMusicLoaded = new bool;
    *isMusicLoaded = 0;
    audioType = new int;
    FSOUND_Init (44100, 32, 0);
}

Audio::~Audio()
{
    delete isMusicLoaded;
    delete audioType;
    if(streamHandle != NULL)
        FSOUND_Stream_Close(streamHandle);
    if(musicHandle != NULL)
        FMUSIC_FreeSong(musicHandle);
    FSOUND_Close();
}

bool Audio::LoadAudio(char* fileName)
{
    if(*isMusicLoaded == 1)
        return 0;//Music Already Loaded, Don't Bother Loading More

    if(strstr(fileName, ".mp3") != NULL)
        *audioType = AUDIO_TYPE_MP3;
    else if(strstr(fileName, ".wav") != NULL)
        *audioType = AUDIO_TYPE_WAV;
    else if(strstr(fileName, ".ogg") != NULL)
        *audioType = AUDIO_TYPE_OGG;
    else if(strstr(fileName, ".mid") != NULL)
        *audioType = AUDIO_TYPE_MIDI;
    else
        return 0;//File Type Not Supported

    if(*audioType < 104)//IF AUDIO ISN'T A MIDI FILE
    {
        streamHandle = FSOUND_Stream_Open(fileName, 0, 0, 0);
        if(streamHandle == NULL)
            return 0; //error loading
        else
            *isMusicLoaded++;
    }
    else//if it is a midi file
    {
        musicHandle = FMUSIC_LoadSong(fileName);
        if(musicHandle == NULL)
            return 0;//error loading
        else
            *isMusicLoaded++;
    }

    return 1;
}

bool Audio::ClearAudio()
{
    if(streamHandle != NULL)
    {
        if(!FSOUND_Stream_Close(streamHandle))
            return 0;
    }
    else if(musicHandle != NULL)
    {
        if(!FMUSIC_FreeSong(musicHandle))
            return 0;
    }
    return 1;
}

bool Audio::PlayAudio()
{
    if(isMusicLoaded == 0)
        return 0;//No Music Loaded to be played

    if(*audioType  < 104)//If Audio isn't a midi file
    {
        if(!FSOUND_Stream_Play(0, streamHandle))
            return 0;
    }
    else
    {
        if(!FMUSIC_PlaySong(musicHandle))
            return 0;
    }
    return 1;
}

bool Audio::StopAudio()
{
    if(isMusicLoaded == 0)
        return 0;//No Music loaded to be stopped

    if(*audioType < 104)//if Audio isn't a midi file
    {
        if(!FSOUND_Stream_Stop(streamHandle));
            return 0;
    }
    else
    {
        if(!FMUSIC_StopSong(musicHandle))
            return 0;
    }
    return 1;
}

bool Audio::PauseAudio(bool paused)
{
    if(isMusicLoaded == 0)
        return 0;//No Music loaded to be paused

    if(*audioType < 104)//if Audio isn't a midi file
    {
        if(!FSOUND_SetPaused(0, paused))
            return 0;
    }
    else
    {
        if(!FMUSIC_SetPaused(musicHandle, paused))
            return 0;
    }
    return 1;
}

bool Audio::SetVolume(int volume)
{
    if(!FMUSIC_SetMasterVolume(musicHandle, volume))
        return 0;
    if(!FSOUND_SetVolume(FSOUND_ALL, volume))
        return 0;
    return 1;
}

I have minimal knowledge about DLL's...I just know how to use functions from them in my program, and I know how to inject them into a remote process. I have ran through articles on how to put this code into a DLL, but with no success. Even if I did put it into a dll, how would i use the code for my AutoIt script, or is it even possible. And if you are unclear when I say use it, I mean like so...

#include <iostream>
#include <windows.h>
#include <conio.h>

#include "Audio.h"

int main()
{
    Audio *audio = new Audio();
    audio->LoadAudio("lol.mp3");
    audio->PlayAudio();
    while (!_kbhit())
    {
    }
    audio->PauseAudio(true);
    Sleep(1000);
    audio->PauseAudio(false);
    Sleep(1000);
    audio->StopAudio();
    audio->ClearAudio();
    delete audio;
    return 0;
}

[Valik]

AutoIt doesn't support using an exported class. To use this code, either create some thin wrapper functions to provide a C-like API by passing around a pointer to the structure and then having each wrapper function invoke the member function through the pointer or make the DLL only store a single global instance of the class and then each thin wrapper function would invoke the member functions through the global variable. The second approach eliminates the need to store a pointer and pass it around (Effectively the this pointer) but it only allows one instance of the class to be instantiated. The first approach means you have to store a pointer and pass it all the time and are responsible for cleaning it up. In both cases, you have to wrap the C++ class in non-member/static functions.

[Mason]

I think I might consider doing htis then.

[Mason]

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#include "Audio.h"

#define DLLEXPORT __declspec(dllexport)

Audio *audio;

DLLEXPORT void InitMusic()
{
            Audio = new Audio();
}

DLLEXPORT  bool CreateMusic(char* path)
{
            return audio->LoadAudio(path);
}

DLLEXPORT bool PlayMusic()
{
            return audio->PlayAudio();
}

DLLEXPORT bool PauseMusic(bool yes)
{
            return audio->PauseAudio(yes);
}

DLLEXPORT bool StopMusic()
{
            return audio->Stop();
}
 
DLLEXPORT bool ClearAudio()
{
            return audio->ClearAudio();
}

DLLEXPORT bool SetVolume(int volume)
{
            return audio->SetVolume(volume);
}

I'm assuming this is what you meant? I would try and compile and use, but I am at family's on a 56k connection. I doubt it is worth it to download a IDE just for this. If you could tell me if this is the general idea that would be great...I don't want to spend the free time I have here wasting it when I could be attempting to finish some work.

[Valik]

Yes, that was the basic concept.

[Richard Robertson]

Why would you need an IDE? All you would need is a compiler. They tend to stay smaller than an entire editor.

[Mason]

Why would you need an IDE? All you would need is a compiler. They tend to stay smaller than an entire editor.

I suppose you are right, but it isn't much use for me right now. I really can't do much without the AutoIt source code for the GUI at my house...and I could write the dll call code in autoit while I am waiting, but that takes all of 10 minutes. I go home tomorrow evening, so I will just leave it at this.