//C++中定义：

struct GPS_TAXI_DATA

{

int id;

int equip_id;

double cross_x;

double cross_y;

string gps_date;

double speed;

int direct;

int status;

int acc;

string rece_date;

};





_declspec(dllimport) GPS_TAXI_DATA * get_gps_data(int year,int month,int day,int hour,int min,int sec,int &GPS_Arry_Num);

[StructLayout(LayoutKind.Sequential)]

        public struct GPS_TAXI_DATA

        {

            [MarshalAs(UnmanagedType.I4)]

            int id;

            [MarshalAs(UnmanagedType.I4)]

            int equip_id;

            [MarshalAs(UnmanagedType.I8)]

            double cross_x;

            [MarshalAs(UnmanagedType.I8)]

            double cross_y;

            [MarshalAs(UnmanagedType.LPStr)]

            string gps_date;

            [MarshalAs(UnmanagedType.I8)]

            double speed;

            [MarshalAs(UnmanagedType.I4)]

            int direct;

            [MarshalAs(UnmanagedType.I4)]

            int status;

            [MarshalAs(UnmanagedType.I4)]

            int acc;

            [MarshalAs(UnmanagedType.LPStr)]

            string rece_date;

        };









        [DllImport(@"C:\Documents and Settings\jiangbinze\桌面\test\test.dll", EntryPoint = "get_gps_data")]