问题描述

C# 引用C++的dll，在C# 如何获取结构体的句柄 作为传入参数，求高手帮忙。

C++ 结构体如下
typedef struct tagHIP
{
USHORT dhcp_enable; //DHCP使能
USHORT reserve; //保留
CHAR ip[HIP_BUF_LEN_32];// 设备IP
CHAR netmask[HIP_BUF_LEN_32];
CHAR gateway[HIP_BUF_LEN_32];
CHAR mac[HIP_MAC_LEN_20];
CHAR multi_ip[HIP_BUF_LEN_32];//多播地址
CHAR dns_addr[HIP_BUF_LEN_32];//DNS服务器
CHAR dns_addr_ext[HIP_BUF_LEN_32];//备用DNS服务器
LONG lReserve; //保留
}HIP_NETWORKE, *LPHIP_NETWORK_t;
函数接口如下
int HIP_I_GetDeviceConfig(LONG lLoginID, DWORD dwCommand,LONG lChannel, LPVOID lpOutBuffer, DWORD dwOutBufferSize, LPDWORD lpBytesReturned, int waittime);

使用如下：
DWORD dwReturn=0;
tagHIP_NETWORKETHPARAM para_network;

int i1=HIP_I_GetDeviceConfig(theApp.loginId, 3 ,0,&para_network,sizeof(tagHIP_NETWORKETHPARAM),&dwReturn,0);//获取参数

结构体及接口转成C#代码如下
public struct tagHIP
{
public ushort dhcp_enable; //DHCP使能
public ushort cmd_port;
public ushort data_port; // 数据端口
public ushort web_port; //web 端口
public ushort broad_port;
public ushort multi_port; //多播端口
public ushort rtsp_port; //RTSP端口
public ushort reserve; //保留

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] ip;// 设备IP

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] netmask;

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] gateway;

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] mac;

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] multi_ip;//多播地址

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] dns_addr;//DNS服务器

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
    public byte[] dns_addr_ext;//备用DNS服务器

    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 4, ArraySubType = UnmanagedType.I1)]
    public byte[] bReserve;                    //保留

    public void Init()
    {
        ip = new byte[32];
        netmask = new byte[32];
        gateway = new byte[32];
        mac = new byte[32];
        multi_ip = new byte[32];
        dns_addr = new byte[32];
        dns_addr_ext = new byte[32];
        bReserve = new byte[4];
    }
}

接口
[DllImport("HIPI_Sdk.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
public static extern int HIP_I_GetDeviceConfig(int lLoginID, uint dwCommand, int lChannel, IntPtr lpOutBuffer,
int dwOutBufferSize, IntPtr lpBytesReturned, int waittime);

C# 代码中如何使用HIP_I_GetDeviceConfig（）；这个函数，第四个参数如何才能把结构体转成句柄？？？
求高手解决，在下感激不尽。

解决方案

可以直接使用结构，例如

[DllImport("HIPI_Sdk.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
public static extern int HIP_I_GetDeviceConfig(int lLoginID, uint dwCommand, int lChannel, ref HIP hip,
int dwOutBufferSize, IntPtr lpBytesReturned, int waittime);