Question

c＃struct定义为：

[StructLayout(LayoutKind.Sequential)]
    public struct RecognizeResult
    {
        /// float
        public float similarity;

        /// char*
        [MarshalAs(UnmanagedType.LPStr)]
        public string fileName;
    }

c function signature:
void FaceRecognition(RecognizeResult *similarity); //where similarity is a pointer to an array

P / Invoke签名：

 [DllImport(DllName, EntryPoint = "FaceRecognition")]
   public static extern void Recognize(ref RecognizeResult similarity);

这就是我在托管代码中调用c ++函数的方式：

RecognizeResult[] results = new RecognizeResult[100];
Recognize(ref results[0]); //through p/invoke

事实证明，数组不能传递给非托管代码，只传递第一个元素。我该如何将数组传递给非托管代码（甚至可能）？

BTW，在调用非托管代码时是否必须固定数组，以便GC不会移动数组？

Answer 1

试试这个：

[DllImport(DllName, EntryPoint = "FaceRecognition")]
public static extern void Recognize(RecognizeResult[] similarity);

RecognizeResult[] results = new RecognizeResult[100];
// fill array elements
Recognize(results);

如何将此struct数组传递给非托管代码？

1 个答案: