在Windows上使用gcc编译FMOD？

Question

我有来自 fmod api 文档的以下示例。

/*===============================================================================================
 PlaySound Example
 Copyright (c), Firelight Technologies Pty, Ltd 2004-2011.

 This example shows how to simply load and play multiple sounds.  This is about the simplest
 use of FMOD.
 This makes FMOD decode the into memory when it loads.  If the sounds are big and possibly take
 up a lot of ram, then it would be better to use the FMOD_CREATESTREAM flag so that it is 
 streamed in realtime as it plays.
===============================================================================================*/
#include <windows.h>
#include <stdio.h>
#include <conio.h>

#include "fmod.h"
#include "fmod_errors.h"

void ERRCHECK(FMOD_RESULT result)
{
    if (result != FMOD_OK)
    {
        printf("FMOD error! (%d) %s\n", result, FMOD_ErrorString(result));
        exit(-1);
    }
}


int main(int argc, char *argv[])
{
    FMOD_SYSTEM      *system;
    FMOD_SOUND       *sound1, *sound2, *sound3;
    FMOD_CHANNEL     *channel = 0;
    FMOD_RESULT       result;
    int               key;
    unsigned int      version;

    /*
        Create a System object and initialize.
    */
    result = FMOD_System_Create(&system);
    ERRCHECK(result);

    result = FMOD_System_GetVersion(system, &version);
    ERRCHECK(result);

    if (version < FMOD_VERSION)
    {
        printf("Error!  You are using an old version of FMOD %08x.  This program requires %08x\n", version, FMOD_VERSION);
        return 0;
    }

    result = FMOD_System_Init(system, 32, FMOD_INIT_NORMAL, NULL);
    ERRCHECK(result);

    result = FMOD_System_CreateSound(system, "../media/drumloop.wav", FMOD_HARDWARE, 0, &sound1);
    ERRCHECK(result);

    result = FMOD_Sound_SetMode(sound1, FMOD_LOOP_OFF); /* drumloop.wav has embedded loop points which automatically makes looping turn on, */
    ERRCHECK(result);                                   /* so turn it off here.  We could have also just put FMOD_LOOP_OFF in the above CreateSound call. */

    result = FMOD_System_CreateSound(system, "../media/jaguar.wav", FMOD_SOFTWARE, 0, &sound2);
    ERRCHECK(result);

    result = FMOD_System_CreateSound(system, "../media/swish.wav", FMOD_HARDWARE, 0, &sound3);
    ERRCHECK(result);

    printf("===================================================================\n");
    printf("PlaySound Example.  Copyright (c) Firelight Technologies 2004-2011.\n");
    printf("===================================================================\n");
    printf("\n");
    printf("Press '1' to play a mono sound using hardware mixing\n");
    printf("Press '2' to play a mono sound using software mixing\n");
    printf("Press '3' to play a stereo sound using hardware mixing\n");
    printf("Press 'Esc' to quit\n");
    printf("\n");

    /*
        Main loop.
    */
    do
    {
        if (_kbhit())
        {
            key = _getch();

            switch (key)
            {
                case '1' :
                {
                    result = FMOD_System_PlaySound(system, FMOD_CHANNEL_FREE, sound1, 0, &channel);
                    ERRCHECK(result);
                    break;
                }
                case '2' :
                {
                    result = FMOD_System_PlaySound(system, FMOD_CHANNEL_FREE, sound2, 0, &channel);
                    ERRCHECK(result);
                    break;
                }
                case '3' :
                {
                    result = FMOD_System_PlaySound(system, FMOD_CHANNEL_FREE, sound3, 0, &channel);
                    ERRCHECK(result);
                    break;
                }
            }
        }

        FMOD_System_Update(system);

        {
            unsigned int ms = 0;
            unsigned int lenms = 0;
            int          playing = 0;
            int          paused = 0;
            int          channelsplaying = 0;

            if (channel)
            {
                FMOD_SOUND *currentsound = 0;

                result = FMOD_Channel_IsPlaying(channel, &playing);
                if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE) && (result != FMOD_ERR_CHANNEL_STOLEN))
                {
                    ERRCHECK(result);
                }

                result = FMOD_Channel_GetPaused(channel, &paused);
                if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE) && (result != FMOD_ERR_CHANNEL_STOLEN))
                {
                    ERRCHECK(result);
                }

                result = FMOD_Channel_GetPosition(channel, &ms, FMOD_TIMEUNIT_MS);
                if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE) && (result != FMOD_ERR_CHANNEL_STOLEN))
                {
                    ERRCHECK(result);
                }

                FMOD_Channel_GetCurrentSound(channel, &currentsound);
                if (currentsound)
                {
                    result = FMOD_Sound_GetLength(currentsound, &lenms, FMOD_TIMEUNIT_MS);
                    if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE) && (result != FMOD_ERR_CHANNEL_STOLEN))
                    {
                        ERRCHECK(result);
                    }
                }
            }

            result = FMOD_Sound_GetLength(sound1, &lenms, FMOD_TIMEUNIT_MS);
            if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE) && (result != FMOD_ERR_CHANNEL_STOLEN))
            {
                ERRCHECK(result);
            }

            FMOD_System_GetChannelsPlaying(system, &channelsplaying);

            printf("Time %02d:%02d:%02d/%02d:%02d:%02d : %s : Channels Playing %2d\r", ms / 1000 / 60, ms / 1000 % 60, ms / 10 % 100, lenms / 1000 / 60, lenms / 1000 % 60, lenms / 10 % 100, paused ? "Paused " : playing ? "Playing" : "Stopped", channelsplaying);
        }

        Sleep(10);

    } while (key != 27);

    printf("\n");

    /*
        Shut down
    */
    result = FMOD_Sound_Release(sound1);
    ERRCHECK(result);
    result = FMOD_Sound_Release(sound2);
    ERRCHECK(result);
    result = FMOD_Sound_Release(sound3);
    ERRCHECK(result);
    result = FMOD_System_Close(system);
    ERRCHECK(result);
    result = FMOD_System_Release(system);
    ERRCHECK(result);

    return 0;
}

我试图用以下内容编译它，但它似乎不起作用。这是我的输出...

c:\Users\-r.s-\Desktop\fmod>gcc -c -o test.o test.c -I"C:\Program Files (x86)\FM
OD SoundSystem\FMOD Programmers API Windows\api\inc"

c:\Users\-r.s-\Desktop\fmod>gcc -o test.exe test.o -L"C:\Program Files (x86)\FMO
D SoundSystem\FMOD Programmers API Windows\api\lib"
test.o:test.c:(.text+0x413): undefined reference to `FMOD_System_Create@4'
test.o:test.c:(.text+0x436): undefined reference to `FMOD_System_GetVersion@8'
test.o:test.c:(.text+0x499): undefined reference to `FMOD_System_Init@16'
test.o:test.c:(.text+0x4d4): undefined reference to `FMOD_System_CreateSound@20'

test.o:test.c:(.text+0x4f8): undefined reference to `FMOD_Sound_SetMode@8'
test.o:test.c:(.text+0x533): undefined reference to `FMOD_System_CreateSound@20'

test.o:test.c:(.text+0x56e): undefined reference to `FMOD_System_CreateSound@20'

test.o:test.c:(.text+0x643): undefined reference to `FMOD_System_PlaySound@20'
test.o:test.c:(.text+0x67f): undefined reference to `FMOD_System_PlaySound@20'
test.o:test.c:(.text+0x6bb): undefined reference to `FMOD_System_PlaySound@20'
test.o:test.c:(.text+0x6d8): undefined reference to `FMOD_System_Update@4'
test.o:test.c:(.text+0x722): undefined reference to `FMOD_Channel_IsPlaying@8'
test.o:test.c:(.text+0x757): undefined reference to `FMOD_Channel_GetPaused@8'
test.o:test.c:(.text+0x794): undefined reference to `FMOD_Channel_GetPosition@12
'
test.o:test.c:(.text+0x7c9): undefined reference to `FMOD_Channel_GetCurrentSoun
d@8'
test.o:test.c:(.text+0x7ed): undefined reference to `FMOD_Sound_GetLength@12'
test.o:test.c:(.text+0x82a): undefined reference to `FMOD_Sound_GetLength@12'
test.o:test.c:(.text+0x85f): undefined reference to `FMOD_System_GetChannelsPlay
ing@8'
test.o:test.c:(.text+0x9a8): undefined reference to `FMOD_Sound_Release@4'
test.o:test.c:(.text+0x9c4): undefined reference to `FMOD_Sound_Release@4'
test.o:test.c:(.text+0x9e0): undefined reference to `FMOD_Sound_Release@4'
test.o:test.c:(.text+0x9fc): undefined reference to `FMOD_System_Close@4'
test.o:test.c:(.text+0xa18): undefined reference to `FMOD_System_Release@4'
collect2: ld returned 1 exit status

c:\Users\-r.s-\Desktop\fmod>

Answer 1

您似乎在链接器行中缺少 FMOD 库，您需要 -lfmodex 将 libfmodex.a 链接到您的项目。