c# app

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace DVRtest
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            int userid = 0;

            _net_sdk_deviceinfo dinfo = new _net_sdk_deviceinfo();
            int port = 6036;

            try
            {

                if (DVR.NET_SDK_Init())
                {
                    Console.WriteLine("ok");
                    userid = DVR.NET_SDK_Login("192.168.1.132", port, "admin", "123456", ref dinfo);
                    userid.ToString();
                }
                else
                {
                    Console.WriteLine("err");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            Console.ReadKey();

        }
    }

    public class DVR
    {
        [DllImport("DVR_NET_SDK.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern int NET_SDK_Login([MarshalAs(UnmanagedType.LPStr)]string sDVRIP, int wDVRPort, [MarshalAs(UnmanagedType.LPStr)]string sUserName, [MarshalAs(UnmanagedType.LPStr)]string sPassword, ref _net_sdk_deviceinfo devinfo);
        [DllImport("DVR_NET_SDK.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern bool NET_SDK_CapturePicture_Other(short userID, short channel, StringBuilder filename);
        [DllImport("DVR_NET_SDK.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern bool NET_SDK_Init();
        //public static extern bool NET_SDK_GetSDKVersion();
    }

    public struct _net_sdk_deviceinfo
    {
        byte localVideoInputNum;        //±ľµŘĘÓƵĘäČëͨµŔĘýÄż
        byte audioInputNum;         //ŇôƵĘäČëͨµŔĘýÄż
        byte sensorInputNum;            //´«¸ĐĆ÷ĘäČëͨµŔĘýÄż
        byte sensorOutputNum;       //ĽĚµçĆ÷ĘäłöĘýÄż
        uint displayResolutionMask;  //ĽŕĘÓĆ÷żÉѡÔńµÄ·Ö±ćÂĘ

        byte videoOuputNum;         //ĘÓƵĘäłöĘýÄżŁ¨Ľ°Ö§łÖ»Ř·Ĺ×î´óͨµŔĘýŁ©
        byte netVideoOutputNum;     //ÍřÂç»Ř·Ĺ×î´óͨµŔĘýÄż
        byte netVideoInputNum;      //Ęý×ÖĐźŽÓČëͨµŔĘýÄż
        byte IVSNum;                    //ÖÇÄÜ·ÖÎöͨµŔĘýÄż

        byte presetNumOneCH;            //Ăż¸öͨµŔÔ¤ÖõăĘýÄż
        byte cruiseNumOneCH;            //Ăż¸öͨµŔѲş˝ĎßĘýÄż
        byte presetNumOneCruise;        //Ăż¸öѲş˝ĎßµÄÔ¤ÖõăĘýÄż
        byte trackNumOneCH;         //Ăż¸öͨµŔąěĽŁĘýÄż

        byte userNum;               //ÓĂ»§ĘýÄż
        byte netClientNum;          //×î¶ŕżÍ»§¶ËĘýÄż
        byte netFirstStreamNum;     //Ö÷ÂëÁ÷´«ĘäµÄͨµŔ×î´óĘýÄżŁ¬Ľ´Í¬Ę±żÉŇÔÓĐĽ¸¸öżÍ»§¶Ë˛éż´Ö÷ÂëÁ÷
        byte deviceType;                //É豸ŔŕĐÍ

        byte doblueStream;          //ĘÇ·ńÓĐĚáą©Ë«ÂëÁ÷
        byte audioStream;           //ĘÇ·ńÓĐĚáą©ŇôƵÁ÷
        byte talkAudio;             //ĘÇ·ńÓжԽ˛ą¦ÄÜ: 1±íĘľÓжԽ˛ą¦ÄÜ;0±íʾûÓĐ
        byte bPasswordCheck;            //˛Ů×÷ĘÇ·ńŇŞĘäČëĂÜÂë

        byte defBrightness;         //ȱʡÁÁ¶Č
        byte defContrast;           //ȱʡ¶Ô±Č¶Č
        byte defSaturation;         //ȱʡ±ĄşÍ¶Č
        byte defHue;                    //ȱʡɫµ÷

        short videoInputNum;            //ĘÓƵĘäČëͨµŔĘýÄżŁ¨±ľµŘĽÓÍřÂ磩
        short deviceID;             //É豸IDşĹ
        uint videoFormat;            //ϵͳµ±Ç°ÖĆĘ˝

        //ĽŮČçĘÇFUNC_REMOTE_UPGRADE¶ÔÓ¦µÄą¦ÄÜŁ¬ÄÇĂ´µÚFUNC_REMOTE_UPGRADE¸ö±ČĚŘÎŞ1Ł¬·ńÔňÎŞÁ㡣
        uint function;          //ą¦ÄÜĂčĘö

        uint deviceIP;              //É豸ÍřÂçµŘÖ·
        byte deviceMAC;         //É豸ÎďŔíµŘÖ·
        ushort devicePort;              //É豸¶ËżÚ

        uint buildDate;             //´´˝¨ČŐĆÚ:year<<16 + month<<8 + mday
        uint buildTime;             //´´˝¨Ę±Ľä:hour<<16 + min<<8 + sec

        char deviceName;            //É豸ĂűłĆ

        char firmwareVersion;           //ąĚĽţ°ć±ľ
        char kernelVersion;             //Äں˰汾
        char hardwareVersion;           //Ó˛Ľţ°ć±ľ
        char MCUVersion;                    //µĄĆ¬»ú°ć±ľ
    };

    enum NET_SDK_ERROR
    {
        NET_SDK_SUCCESS,
        NET_SDK_PASSWORD_ERROR,
        NET_SDK_NOENOUGH_AUTH,
        NET_SDK_NOINIT,
        NET_SDK_CHANNEL_ERROR,
        NET_SDK_OVER_MAXLINK,
        NET_SDK_LOGIN_REFUSED,
        NET_SDK_VERSION_NOMATCH,
        NET_SDK_NETWORK_FAIL_CONNECT,
        NET_SDK_NETWORK_NOT_CONNECT,
        NET_SDK_NETWORK_SEND_ERROR,
        NET_SDK_NETWORK_RECV_ERROR,
        NET_SDK_NETWORK_RECV_TIMEOUT,
        NET_SDK_NETWORK_ERRORDATA,
        NET_SDK_ORDER_ERROR,
        NET_SDK_OPER_BY_OTHER,
        NET_SDK_OPER_NOPERMIT,
        NET_SDK_COMMAND_TIMEOUT,
        NET_SDK_ERROR_SERIALPORT,
        NET_SDK_ERROR_ALARMPORT,
        NET_SDK_PARAMETER_ERROR,
        NET_SDK_CHAN_EXCEPTION,
        NET_SDK_NODISK,
        NET_SDK_ERROR_DISKNUM,
        NET_SDK_DISK_FULL,
        NET_SDK_DISK_ERROR,
        NET_SDK_NOSUPPORT,
        NET_SDK_BUSY,
        NET_SDK_MODIFY_FAIL,
        NET_SDK_PASSWORD_FORMAT_ERROR,
        NET_SDK_DISK_FORMATING,
        NET_SDK_DVR_NORESOURCE,
        NET_SDK_DVR_OPRATE_FAILED,
        NET_SDK_OPEN_HOSTSOUND_FAIL,
        NET_SDK_DVR_VOICEOPENED,
        NET_SDK_TIME_INPUTERROR,
        NET_SDK_NOSPECFILE,
        NET_SDK_CREATEFILE_ERROR,
        NET_SDK_FILEOPENFAIL,
        NET_SDK_OPERNOTFINISH,
        NET_SDK_GETPLAYTIMEFAIL,
        NET_SDK_PLAYFAIL,
        NET_SDK_FILEFORMAT_ERROR,
        NET_SDK_DIR_ERROR,
        NET_SDK_ALLOC_RESOURCE_ERROR,
        NET_SDK_AUDIO_MODE_ERROR,
        NET_SDK_NOENOUGH_BUF,
        NET_SDK_CREATESOCKET_ERROR,
        NET_SDK_SETSOCKET_ERROR,
        NET_SDK_MAX_NUM,
        NET_SDK_USERNOTEXIST,
        NET_SDK_WRITEFLASHERROR,
        NET_SDK_UPGRADEFAIL,
        NET_SDK_CARDHAVEINIT,
        NET_SDK_PLAYERFAILED,
        NET_SDK_MAX_USERNUM,
        NET_SDK_GETLOCALIPANDMACFAIL,
        NET_SDK_NOENCODEING,
        NET_SDK_IPMISMATCH,
        NET_SDK_MACMISMATCH,
        NET_SDK_UPGRADELANGMISMATCH,
        NET_SDK_MAX_PLAYERPORT,
        NET_SDK_NOSPACEBACKUP,
        NET_SDK_NODEVICEBACKUP,
        NET_SDK_PICTURE_BITS_ERROR,
        NET_SDK_PICTURE_DIMENSION_ERROR,
        NET_SDK_PICTURE_SIZ_ERROR,
        NET_SDK_LOADPLAYERSDKFAILED,
        NET_SDK_LOADPLAYERSDKPROC_ERROR,
        NET_SDK_LOADDSSDKFAILED,
        NET_SDK_LOADDSSDKPROC_ERROR,
        NET_SDK_DSSDK_ERROR,
        NET_SDK_VOICEMONOPOLIZE,
        NET_SDK_JOINMULTICASTFAILED,
        NET_SDK_CREATEDIR_ERROR,
        NET_SDK_BINDSOCKET_ERROR,
        NET_SDK_SOCKETCLOSE_ERROR,
        NET_SDK_USERID_ISUSING,
        NET_SDK_PROGRAM_EXCEPTION,
        NET_SDK_WRITEFILE_FAILED,
        NET_SDK_FORMAT_READONLY,
        NET_SDK_WITHSAMEUSERNAME,
        NET_SDK_DEVICETYPE_ERROR,
        NET_SDK_LANGUAGE_ERROR,
        NET_SDK_PARAVERSION_ERROR,
        NET_SDK_FILE_SUCCESS,
        NET_SDK_FILE_NOFIND,
        NET_SDK_NOMOREFILE,
        NET_SDK_FILE_EXCEPTION,
        NET_SDK_TRY_LATER,
        NET_SDK_ERROR,
    }

    enum NET_DEVICE_STATUS
    {
        NET_DEVICE_STATUS_CONNECTED,
        NET_DEVICE_STATUS_DISCONNECT,
    };

    enum NET_SDK_STREAM_TYPE
    {
        NET_SDK_MAIN_STREAM,
        NET_SDK_SUB_STREAM,
    };

    enum NET_SDK_PLAYCTRL_TYPE
    {
        NET_SDK_PLAYCTRL_PAUSE,
        NET_SDK_PLAYCTRL_FF,
        NET_SDK_PLAYCTRL_REW,
        NET_SDK_PLAYCTRL_RESUME,
        NET_SDK_PLAYCTRL_STOP,
        NET_SDK_PLAYCTRL_FRAME,
        NET_SDK_PLAYCTRL_NORMAL,
        NET_SDK_PLAYCTRL_STARTAUDIO,
        NET_SDK_PLAYCTRL_STOPAUDIO,
        NET_SDK_PLAYCTRL_AUDIOVOLUME,
        NET_SDK_PLAYCTRL_SETPOS,
    };

    enum NET_SDK_RPB_SPEED
    {
        NET_SDK_RPB_SPEED_1_32X = 1,
        NET_SDK_RPB_SPEED_1_16X,
        NET_SDK_RPB_SPEED_1_8X,     //1/8
        NET_SDK_RPB_SPEED_1_4X,     //1/4
        NET_SDK_RPB_SPEED_1_2X,     //1/2
        NET_SDK_RPB_SPEED_1X,       //1
        NET_SDK_RPB_SPEED_2X,
        NET_SDK_RPB_SPEED_4X,
        NET_SDK_RPB_SPEED_8X,
        NET_SDK_RPB_SPEED_16X,
        NET_SDK_RPB_SPEED_32X,
    };

}