指定的数组不属于需要的类型。
函数原型：
LONG __stdcall IP_NET_DVR_GetIPCInfo(LONG index, IPC_ENTRY * pIPCInfo);
C#
[DllImport("NetSDKDLL.dll")]
public static extern UInt32 IP_NET_DVR_GetIPCInfo(UInt32 index, ref IPC_ENTRY pIPCInfo);

参数：
Index：要读取的第几个设备(从0开始编号),应该小于IP_NET_DVR_GetSearchIPCCount()返回值
pIPCInfo：信息保存指针

#define MAX_IP_NAME_LEN 256
#define MAC_ADDRESS_LEN 256

typedef struct
{
char MACAddress[MAC_ADDRESS_LEN];
int dhcpEnable;
char IPAddress[MAX_IP_NAME_LEN];
char netMask[MAX_IP_NAME_LEN];
char gateWay[MAX_IP_NAME_LEN];
char DNS1[MAX_IP_NAME_LEN];
char DNS2[MAX_IP_NAME_LEN];
}LANConfig;

typedef struct
{
int auth;
int videoPort;
int rtpoverrtsp;//added by johnnyling 20090323
int ptzPort;
int webPort;
}StreamAccessConfig;

#define GROUP_NAME_MAX_LEN 32
#define ACCOUNT_STATUS_MAX_LEN 8
#define ACCOUNT_NAME_MAX_LEN 40
#define ACCOUNT_PASSWORD_MAX_LEN 40
#define MAX_ACCOUNT_COUNT 20

typedef struct
{
char userName[ACCOUNT_NAME_MAX_LEN];
char password[ACCOUNT_PASSWORD_MAX_LEN];
char group[GROUP_NAME_MAX_LEN];
char status[ACCOUNT_STATUS_MAX_LEN];
}UserAccount;

typedef struct
{
int count;
UserAccount accounts[MAX_ACCOUNT_COUNT];
}UserConfig;

#define MAX_IPC_SERIALNUMBER32
#define MAX_DEVICETYPE_LEN32

typedef struct
{
charipc_sn[MAX_IPC_SERIALNUMBER];
chardeviceType[MAX_DEVICETYPE_LEN];
UserConfiguserCfg;
StreamAccessConfigstreamCfg;
LANConfiglanCfg;
}IPC_ENTRY;

c#
[StructLayout(LayoutKind.Sequential)]
public class LANConfig
{
static int MAC_ADDRESS_LEN = 256;
static int MAX_IP_NAME_LEN = 256;
public char[] MACAddress = new char[MAC_ADDRESS_LEN];
public int dhcpEnable;
public char[] IPAddress = new char[MAX_IP_NAME_LEN];
public char[] netMask = new char[MAX_IP_NAME_LEN];
public char[] gateWay = new char[MAX_IP_NAME_LEN];
public char[] DNS1 = new char[MAX_IP_NAME_LEN];
public char[] DNS2 = new char[MAX_IP_NAME_LEN];
}

[StructLayout(LayoutKind.Sequential)]
public class StreamAccessConfig
{
public int auth;
public int videoPort;
public int rtpoverrtsp;//added by johnnyling 20090323
public int ptzPort;
public int webPort;
}

[StructLayout(LayoutKind.Sequential)]
public class UserAccount
{
static int GROUP_NAME_MAX_LEN = 32;
static int ACCOUNT_STATUS_MAX_LEN = 8;
static int ACCOUNT_NAME_MAX_LEN = 40;
static int ACCOUNT_PASSWORD_MAX_LEN = 40;
static int MAX_ACCOUNT_COUNT = 20;

public char[] userName = new char[ACCOUNT_NAME_MAX_LEN];
public char[] password = new char[ACCOUNT_PASSWORD_MAX_LEN];
public char[] group = new char[GROUP_NAME_MAX_LEN];
public char[] status = new char[ACCOUNT_STATUS_MAX_LEN];
}

[StructLayout(LayoutKind.Sequential)]
public class UserConfig
{
static int MAX_ACCOUNT_COUNT = 20;
public int count;
public UserAccount[] accounts = new UserAccount[MAX_ACCOUNT_COUNT];
}

[StructLayout(LayoutKind.Sequential)]
public class IPC_ENTRY
{
static int MAX_IPC_SERIALNUMBER = 32;
static int MAX_DEVICETYPE_LEN = 32;
public char[] ipc_sn = new char[MAX_IPC_SERIALNUMBER];

public char[] deviceType = new char[MAX_DEVICETYPE_LEN];
public UserConfig userCfg;
public StreamAccessConfig streamCfg;
public LANConfig lanCfg;
}

c#调用
IPC_ENTRY ipc = new IPC_ENTRY();
UInt32 lret = Class1.IP_NET_DVR_GetIPCInfo(i, ref ipc);

就报错了 求解答，在线等

[解决办法]
字段用 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]之类的标识长度，去掉按几个static字段，如

C# code

    public struct Logon    {        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]        public String UserName;        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]        public byte[] Passwd;        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]        public byte[] Hash;    }