[英]Passing a C++ Array to C# Layer through Net Core
I have a native library and what I'm trying to do is to write a .NET Core wrapper to this native library. 我有一个本机库,我想做的是向该本机库编写一个.NET Core包装器。
On the native side i have an event called OnSpeechEnded : 在本机方面,我有一个名为OnSpeechEnded的事件:
virtual void OnSpeechEnded(SpeechEndInfo seInfo) = 0;
and native struct SpeechEndInfo has the following structure: 原生结构SpeechEndInfo具有以下结构:
struct SpeechEndInfo
{
std::vector<AudioData> UntouchedData;
std::vector<AudioData> AudioAfterPostSpeechUntilSilenceTrigger;
};
Corresponding .NET Standard Class: 相应的.NET标准类:
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; }
};
On .NET Standard side, the following delegate is defined: 在.NET Standard方面,定义了以下委托:
delegate void OnSpeechEndedInter(
[In, MarshalAs(UnmanagedType.LPArray)] short[] untouched,
int untouchedSize,
[In, MarshalAs(UnmanagedType.LPArray)] short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize);
Declaring pinvoke: 宣告pinvoke:
[DllImport("VadLite.Pinvokable.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern void RegisterToSpeechEndedEvent(IntPtr parameters, [MarshalAs(UnmanagedType.FunctionPtr)]OnSpeechEndedInter onSpeechEndedInter);
Declaring _onSpeechEndedInter: 声明_onSpeechEndedInter:
private OnSpeechEndedInter _onSpeechEndedInter;
Assigning a method to the event: 为事件分配方法:
_onSpeechEndedInter = invokedMethod;
... ...
void invokedMethod(short[] untouchedData,
int untouchedSize,
short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize)
{
OnSpeechEnded?.Invoke(new SpeechEndedInfo(untouchedData, audioAfterPostSpeechUntilSilenceTrigger));
}
Finally, the code where native arrays are sent: 最后,发送本地数组的代码:
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());
});
After running the test program and getting meaningful array sizes on the native side, C# arrays UntouchedData and AudioAfterPostSpeechUntilSilenceTrigger always seem to have size 1. 运行测试程序并在本机端获取有意义的数组大小之后,C#数组UntouchedData和AudioAfterPostSpeechUntilSilenceTrigger似乎总是具有大小1。
Probably there is a detail I have missed. 可能有一个我错过的细节。 I can provide further detail if it is required.
如果需要,我可以提供更多详细信息。 Thanks.
谢谢。
Great!, Finally I have found out the problem. 太好了,终于找到了问题所在。 In the delegate declaration, I just had to introduce parameter SizeParamIndex :
在委托声明中,我只需要引入参数SizeParamIndex :
delegate void OnSpeechEndedInter(
[In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] short[] untouched,
int untouchedSize,
[In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 3)] short[] audioAfterPostSpeechUntilSilenceTrigger,
int audioAfterPostSpeechUntilSilenceTriggerSize);
Because the marshaler cannot determine the size of an unmanaged array, we have to pass it in as a separate parameter considering the signature of the method and zero based indexing. 由于封送拆封器无法确定非托管数组的大小,因此必须考虑方法的签名和从零开始的索引,将其作为单独的参数传递。
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