C#调用C++库(dll)的函数

extern "C" __declspec(dllexport) void ThundbirdPhaseLocalFolder(const string* localFolderPaths,const string* zipFolders, bool (*isProcess)())
{
    const char* localFolderPath = localFolderPaths->c_str();
    const char* zipFolder = zipFolders->c_str();    

}

namespace TestThunderbirdZipperCSharp
{
    class CPPDLL
    {
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate bool IsProcess();

        [DllImport("ThunderbirdLocalFolderZipper.dll")]
        public static extern void ThundbirdPhaseLocalFolder([MarshalAs(UnmanagedType.LPWStr)]string localFolderPath, [MarshalAs(UnmanagedType.LPWStr)]string zipFolder, [MarshalAs(UnmanagedType.FunctionPtr)]  IsProcess isProcess);
    }
}

namespace TestThunderbirdZipperCSharp
{
    class Program
    {
        static bool flag = true;

        static bool callback()
        {
            return flag;
        }

        static void Main(string[] args)
        {
            string localFolderPath = "";
            string zipFolder = "";


            CPPDLL.ThundbirdPhaseLocalFolder(localFolderPath, zipFolder, callback);
        }
    }
}