C++后台Dll,C#前端接口

C++ 

#ifdef EXPORT_ExportDllII
#define EXPORT_ExportDllII_API __declspec(dllexport)
#else
#define EXPORT_ExportDllII_API __declspec(dllimport)
#endif

#pragma pack(1)//结构1字节对齐


typedef struct BasicData
{
UINT32 u32Index;
char  Dscp[4];
char  VlanPriority[8];
char  TTL[4];
char Time[32];
char SrcAddr[20];
char DesAddr[20];
char ProtocolType[16];
char  info[100];
UINT32  U32PacketLen;
}BasicData;

#pragma pack(）

typedef void(__stdcall *GetOneLineDataPtr)(BasicData DtBasic); 
extern "C" EXPORT_ExportDllII_API bool QueryDtBasic(GetOneLineDataPtr fHandlerFunc);

C#

public class dllinterface
    {
        [DllImport(@"ExportDll.dll", CharSet = CharSet.Unicode)]
        public static extern void QueryDtBasic(GetOneLineDataPtr f);

   }

public delegate void GetOneLineDataPtr(BasicData oneData);
    //回调函数的数据结构体
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
    public unsafe struct BasicData
    {
        public uint u32Index;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
        public string u32Dscp;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
        public string u32VlanPriority;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
        public string u32TTL;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string u64Time;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
        public string u32SrcAddr;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
        public string u32DesAddr;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
        public string u32ProtocolType;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]
        public string info;
        public uint u32Length;
    }

GetOneLineDataPtr pOneLineData = new GetOneLineDataPtr(GetOneLineData);
            dllinterface.QueryDtBasic(pOneLineData);