[英]Passing a C++ Array to C# Layer through Net Core
我有一個本機庫,我想做的是向該本機庫編寫一個.NET Core包裝器。
在本機方面,我有一個名為OnSpeechEnded的事件:
virtual void OnSpeechEnded(SpeechEndInfo seInfo) = 0;
原生結構SpeechEndInfo具有以下結構:
struct SpeechEndInfo
{
std::vector<AudioData> UntouchedData;
std::vector<AudioData> AudioAfterPostSpeechUntilSilenceTrigger;
};
相應的.NET標准類:
public struct SpeechEndedInfo
{
public SpeechEndedInfo(short[] untouchedData, short[] audioAfterPostSpeechUntilSilenceTrigger)
{
UntouchedData = new short[untouchedData.Length];
untouchedData.CopyTo(UntouchedData, 0);
AudioAfterPostSpeechUntilSilenceTrigger = new short[audioAfterPostSpeechUntilSilenceTrigger.Length];
audioAfterPostSpeechUntilSilenceTrigger.CopyTo(AudioAfterPostSpeechUntilSilenceTrigger, 0);
}
public short[] UntouchedData { get; set; }
public short[] AudioAfterPostSpeechUntilSilenceTrigger { get; set; }
};
在.NET Standard方面,定義了以下委托:
delegate void OnSpeechEndedInter(
[In, MarshalAs(UnmanagedType.LPArray)] short[] untouched,
int untouchedSize,
[In, MarshalAs(UnmanagedType.LPArray)] short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize);
宣告pinvoke:
[DllImport("VadLite.Pinvokable.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern void RegisterToSpeechEndedEvent(IntPtr parameters, [MarshalAs(UnmanagedType.FunctionPtr)]OnSpeechEndedInter onSpeechEndedInter);
聲明_onSpeechEndedInter:
private OnSpeechEndedInter _onSpeechEndedInter;
為事件分配方法:
_onSpeechEndedInter = invokedMethod;
...
void invokedMethod(short[] untouchedData,
int untouchedSize,
short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize)
{
OnSpeechEnded?.Invoke(new SpeechEndedInfo(untouchedData, audioAfterPostSpeechUntilSilenceTrigger));
}
最后,發送本地數組的代碼:
RegisterToSpeechEndedEvent(
void * possiblyOperations,
void __stdcall onSpeechEndedListener(const int16_t* pUntouchedData, int pUntouchedDataSize, const int16_t *vAudioAfterPostSpeechUntilSilenceTrigger, int vAudioAfterPostSpeechUntilSilenceTriggerSize))
{
auto op = (OperationParameters *)possiblyOperations;
op->OnSpeechEnded([onSpeechEndedListener](SpeechEndInfo ssInfo) {
std::vector<int16_t> untouchedData;
std::vector<int16_t> audioAfterPostSpeechUntilSilenceTrigger;
for (auto & audioData : ssInfo.UntouchedData)
{
untouchedData.insert(untouchedData.end(), audioData.Samples, audioData.Samples + audioData.SampleCount);
}
for (auto & audioData : ssInfo.AudioAfterPostSpeechUntilSilenceTrigger)
{
audioAfterPostSpeechUntilSilenceTrigger.insert(audioAfterPostSpeechUntilSilenceTrigger.end(), audioData.Samples, audioData.Samples + audioData.SampleCount);
}
onSpeechEndedListener(untouchedData.empty() ? nullptr : untouchedData.data(),
(int)untouchedData.size(),
audioAfterPostSpeechUntilSilenceTrigger.empty() ? nullptr : audioAfterPostSpeechUntilSilenceTrigger.data(),
(int)audioAfterPostSpeechUntilSilenceTrigger.size());
});
運行測試程序並在本機端獲取有意義的數組大小之后,C#數組UntouchedData和AudioAfterPostSpeechUntilSilenceTrigger似乎總是具有大小1。
可能有一個我錯過的細節。 如果需要,我可以提供更多詳細信息。 謝謝。
太好了,終於找到了問題所在。 在委托聲明中,我只需要引入參數SizeParamIndex :
delegate void OnSpeechEndedInter(
[In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] short[] untouched,
int untouchedSize,
[In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 3)] short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize);
由於封送拆封器無法確定非托管數組的大小,因此必須考慮方法的簽名和從零開始的索引,將其作為單獨的參數傳遞。
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