如何正确地将无符号字符*从c封送到c#

// C语言代码
unsigned char* processUnsignedChar(unsigned char* data, int length) {
    // 对无符号字符*进行处理
    // ...
    return processedData;
}

// C#代码
using System;
using System.Runtime.InteropServices;

class Program {
    [DllImport("your_c_library.dll", CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr processUnsignedChar(IntPtr data, int length);
}

// C#代码
class Program {
    static void Main(string[] args) {
        // 创建输入数据
        byte[] inputData = new byte[] { 0xFF, 0x00, 0xAA };

        // 分配内存并将输入数据拷贝到内存中
        IntPtr inputPtr = Marshal.AllocHGlobal(inputData.Length);
        Marshal.Copy(inputData, 0, inputPtr, inputData.Length);

        // 调用C语言函数
        IntPtr outputPtr = processUnsignedChar(inputPtr, inputData.Length);

        // 将结果从内存中拷贝到C#中
        byte[] outputData = new byte[inputData.Length];
        Marshal.Copy(outputPtr, outputData, 0, outputData.Length);

        // 释放内存
        Marshal.FreeHGlobal(inputPtr);
        Marshal.FreeHGlobal(outputPtr);

        // 打印结果
        Console.WriteLine("Processed Data:");
        foreach (byte value in outputData) {
            Console.WriteLine(value.ToString("X2"));
        }
    }
}