Question

我有一个相当令人困惑的问题，一个过去常常工作的程序现在只能在每次重启时工作一次，再次运行它我被授予：

# Access by name
x_vec[["x10"]]
# [1] 100

# Access by index
x_vec[[10]]
# [1] 100

我已经使用C导出扩展了一个C ++项目，所以我可以在C＃中使用它：

C出口：

Exception thrown: read access violation. this was 0xBF13D000.

C＃声明：

KeyFinder::AudioData* new_audio_data(const unsigned frame_rate, const unsigned channels, const unsigned samples)
{
    auto audio_data = new KeyFinder::AudioData();
    audio_data->setFrameRate(frame_rate);
    audio_data->setChannels(channels);
    audio_data->addToSampleCount(samples);
    return audio_data;
}

void audio_data_set_sample(KeyFinder::AudioData* audio_data, const unsigned index, const double value)
{
    audio_data->setSample(index, value);
}

void keyfinder_progressive_chromagram(KeyFinder::KeyFinder* key_finder, KeyFinder::AudioData* audio_data, KeyFinder::Workspace* workspace)
{
    key_finder->progressiveChromagram(*audio_data, *workspace);
}

KeyFinder::key_t keyfinder_key_of_chromagram(KeyFinder::KeyFinder* key_finder, KeyFinder::Workspace* workspace)
{
    return key_finder->keyOfChromagram(*workspace);
}

enum key_t {
    A_MAJOR = 0,
    A_MINOR,
    B_FLAT_MAJOR,
    B_FLAT_MINOR,
    B_MAJOR,
    B_MINOR = 5,
    C_MAJOR,
    C_MINOR,
    D_FLAT_MAJOR,
    D_FLAT_MINOR,
    D_MAJOR = 10,
    D_MINOR,
    E_FLAT_MAJOR,
    E_FLAT_MINOR,
    E_MAJOR,
    E_MINOR = 15,
    F_MAJOR,
    F_MINOR,
    G_FLAT_MAJOR,
    G_FLAT_MINOR,
    G_MAJOR = 20,
    G_MINOR,
    A_FLAT_MAJOR,
    A_FLAT_MINOR,
    SILENCE = 24
};

C＃用法：

[DllImport("libKeyFinder", CallingConvention = CallingConvention.Cdecl)]
private static extern IntPtr new_audio_data(
    uint frameRate, uint channels, uint samples);

[DllImport("libKeyFinder", CallingConvention = CallingConvention.Cdecl)]
private static extern void audio_data_set_sample(
    IntPtr audioData, uint index, double value);

[DllImport("libKeyFinder", CallingConvention = CallingConvention.Cdecl)]
private static extern void keyfinder_progressive_chromagram(IntPtr keyFinder, IntPtr audioData, IntPtr workspace);

[DllImport("libKeyFinder", CallingConvention = CallingConvention.Cdecl)]
private static extern Key keyfinder_key_of_chromagram(IntPtr keyFinder, IntPtr workspace);

public enum Key
{
    AMajor = 0,
    AMinor,
    BFlatMajor,
    BFlatMinor,
    BMajor,
    BMinor = 5,
    CMajor,
    CMinor,
    DFlatMajor,
    DFlatMinor,
    DMajor = 10,
    DMinor,
    EFlatMajor,
    EFlatMinor,
    EMajor,
    EMinor = 15,
    FMajor,
    FMinor,
    GFlatMajor,
    GFlatMinor,
    GMajor = 20,
    GMinor,
    AFlatMajor,
    AFlatMinor,
    Silence = 24
}

真正令人费解的是，当我调试它时，看似处理/破坏的指针已经在C＃部分中可见：public void SetSample(uint index, double value) { audio_data_set_sample(_audioData, index, value); }。最初，当从C＃调用SetSample._audioData时，我得到一个有效的指针，如new_audio_data但由于某种原因，它变为0x032fe940。请注意，始终会成为价值0xBF13D000，因此我已经在线搜索了这样的价值，希望能够发现a known memory pattern，但却没有成功。

正如我所说的那样，对程序没有任何更改，所以我完全失去了可能导致此问题的原因。

Answer 1

尝试为_audioData添加volatile https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/volatile

Answer 2

事实证明，有些本机库需要使用相同的编译器版本进行全部重建，现在它可以完美运行！

抛出异常：读取访问冲突。这是0xBF13D000

2 个答案: