Maui如何使用miniaudio库

Question

想使用miniaudio这个c库（音频相关，可录音和播放等）封装到自己的c++动态链接库中，让后由自己的Maui程序来调用库中的方法。这样做的目的是利用这个库的跨平台特性，让自己的Maui程序写一次就能运行到win、ios、android、Mac上。但是目前我封装的库是VS写的 C++库， 能被C#控制台应用调用，但是集成到Maui中就不行。请问有什么思路吗？

void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    ma_encoder* pEncoder = (ma_encoder*)pDevice->pUserData;
    MA_ASSERT(pEncoder != NULL);

    ma_encoder_write_pcm_frames(pEncoder, pInput, frameCount, NULL);

    (void)pOutput;
}


int RecordSong(wchar_t* outFileName)
{
    ma_result result;
    ma_encoder_config encoderConfig;
    ma_encoder encoder;
    ma_device_config deviceConfig;
    ma_device device;

    encoderConfig = ma_encoder_config_init(ma_encoding_format_wav, ma_format_f32, 2, 44100);

    if (ma_encoder_init_file((char*)outFileName, &encoderConfig, &encoder) != MA_SUCCESS) {
        printf("Failed to initialize output file.\n");
        return -1;
    }

    deviceConfig = ma_device_config_init(ma_device_type_capture);
    deviceConfig.capture.format = encoder.config.format;
    deviceConfig.capture.channels = encoder.config.channels;
    deviceConfig.sampleRate = encoder.config.sampleRate;
    deviceConfig.dataCallback = data_callback;
    deviceConfig.pUserData = &encoder;

    result = ma_device_init(NULL, &deviceConfig, &device);
    if (result != MA_SUCCESS) {
        printf("Failed to initialize capture device.\n");
        return -2;
    }

    result = ma_device_start(&device);
    if (result != MA_SUCCESS) {
        ma_device_uninit(&device);
        printf("Failed to start device.\n");
        return -3;
    }
    

    printf("Press Enter to stop recording...\n");
    getchar();

    ma_device_uninit(&device);
    ma_encoder_uninit(&encoder);

    return 0;

}

int PlaySong(wchar_t* fileName) {

    ma_result result;
    ma_engine engine;

    result = ma_engine_init(NULL, &engine);
    if (result != MA_SUCCESS) {

        printf("%d", result);
        return result;
    }

    ma_sound sound;

    result = ma_sound_init_from_file(&engine, (char*)fileName, 0, NULL, NULL, &sound);
    if (result != MA_SUCCESS) {
        printf("%d", result);
        return result;
    }

    ma_sound_start(&sound);
    
    getchar();
    return 0;

}

[DllImport("miniaudioapi.dll", EntryPoint = "HelloWorld", CallingConvention = CallingConvention.Cdecl)]
          public static extern void HelloWorld(string name);

        [DllImport("miniaudioapi.dll", EntryPoint = "PlaySong", CallingConvention = CallingConvention.Cdecl)]
        public static extern void PlaySong(string fileName);

        [DllImport("miniaudioapi.dll", EntryPoint = "RecordSong", CallingConvention = CallingConvention.Cdecl)]
        public static extern void RecordSong(string outFileName);

Answer 1

你的代码部分，我是没有看出来有什么问题。你的C++库可以被C#控制台应用程序调用，那么它应该可以被使用Maui调用的呀。

• 你看看C++库有没有和Maui应用程序一起打包。文件名、路径和文件格式（.dll）正确。

• 检查函数的签名是否正确。P/Invoke函数的签名应与C++库中的函数签名匹配。

• C++库中的所有指针和内存分配调用正确的释放函数。