#define MAX_STRM_LAYER 3  // 最多几级流媒体
//服务器信息
typedef struct tagServerInfo
{
     long uID;                     
     char csStrMIP[MAX_STRM_LAYER][16];  // 这个不知道如何转换       
     unsigned short nStrMPort[MAX_STRM_LAYER];  

     char csDdtIP[16];             
     unsigned short nDdtPort;      
     unsigned short bIsWebUser;    

     unsigned short protocolType;  
     const char *pcUserName;       
     const char *pcPassword;       

     char csStoreFileSvrIP[16];         
     unsigned short nStoreFileSvrPort;  

     char csDevFileSvrIP[16];           
     unsigned short nDevFileSvrPort;    

}TServerInfo, *LPServerInfo;

LONG __stdcall StrM_Login(LPServerInfo mts, int iLayer = 1);

/// <summary>
/// 最多几级流媒体
/// </summary>
public const int MAX_STRM_LAYER = 3;

        /// <summary>
        /// 服务器信息
        /// </summary>
        [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public struct TServerInfo
        {
            public int uID;
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 3, ArraySubType = UnmanagedType.LPStr)]
            public string[] csStrMIP;

            public ushort[] nStrMPort;

            [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string csDdtIP;

            public ushort nDdtPort;

            public ushort bIsWebUser;

            public ushort protocolType;

            public string pcUserName;

            public string pcPassword;

            [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string csStoreFileSvrIP;

            public ushort nStoreFileSvrPort;

            [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string csDevFileSvrIP;
 
            public ushort nDevFileSvrPort;
        }

        [DllImport("StreamMedia.dll")]
        public static extern int StrM_Login(ref TServerInfo mts, int iLayer);