我如何从dll调用函数？我有AccessViolationExeception。
我在C上签名：
int WINAPI LogonNowait(Context* comm,
char* host,
char* username,
char* password,
char* shell_cmd,
char* logon_error_msg,
int buflen,
SOCKET* sIO,
SOCKET* sErr
)
[DllImport(@"C:\\MyDLL.dll")]
public static extern int WaitForLogon(ref Context ctx, ref string errmsg, int bLen, ref int sIO, ref int sErr);
[StructLayout(LayoutKind.Sequential)]
public struct CommContext
{
public uint inited;
public uint rbufsize;
public uint rbuf;
public uint r_in_container;
public uint left_in_container;
public uint next_in_container;
public uint wbufsize;
public uint wbuf;
public uint w_in_container;
public uint first_free;
public uint empty_container;
public uint socket;
public uint hdrtype;
public uint last_error;
public uint socket2;
public string RX_context;
public int port;
public uint async_header;
public string my_host_addr;
public override string ToString()
{
return port.ToString();
}
}
附加信息：尝试读取或写入受保护的内存。这通常表明其他内存已损坏。 我怎样才能正确地从C＃调用这个方法？
答案 0 :(得分：-1)
我会做这样的事情。不确定它是否完全正确，但是接近。我更新了原始帖子，以摆脱设置套接字时发生的错误。您必须在运行代码之前初始化CommContext。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
class Program
{
//int WINAPI LogonNowait(Context* comm,
// char* host,
// char* username,
// char* password,
// char* shell_cmd,
// char* logon_error_msg,
// int buflen,
// SOCKET* sIO,
// SOCKET* sErr
// )
[DllImport(@"C:\\MyDLL.dll",CallingConvention = CallingConvention.Cdecl)]
public static extern int WaitForLogon(IntPtr ctx, IntPtr host, IntPtr username, IntPtr password, IntPtr shell_cmd, IntPtr errmsg, int bLen, IntPtr sIO, IntPtr sErr);
[DllImport("ws2_32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern Int32 WSAStartup(Int16 wVersionRequested, out WSAData wsaData);
[DllImport("ws2_32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr socket(ADDRESS_FAMILIES_INT af, SOCKET_TYPE_INT socket_type, PROTOCOL_INT protocol);
internal enum ADDRESS_FAMILIES_INT : int
{
/// <summary>
/// Unspecified [value = 0].
/// </summary>
AF_UNSPEC = 0,
/// <summary>
/// Local to host (pipes, portals) [value = 1].
/// </summary>
AF_UNIX = 1,
/// <summary>
/// Internetwork: UDP, TCP, etc [value = 2].
/// </summary>
AF_INET = 2,
/// <summary>
/// Arpanet imp addresses [value = 3].
/// </summary>
AF_IMPLINK = 3,
/// <summary>
/// Pup protocols: e.g. BSP [value = 4].
/// </summary>
AF_PUP = 4,
/// <summary>
/// Mit CHAOS protocols [value = 5].
/// </summary>
AF_CHAOS = 5,
/// <summary>
/// XEROX NS protocols [value = 6].
/// </summary>
AF_NS = 6,
/// <summary>
/// IPX protocols: IPX, SPX, etc [value = 6].
/// </summary>
AF_IPX = 6,
/// <summary>
/// ISO protocols [value = 7].
/// </summary>
AF_ISO = 7,
/// <summary>
/// OSI is ISO [value = 7].
/// </summary>
AF_OSI = 7,
/// <summary>
/// european computer manufacturers [value = 8].
/// </summary>
AF_ECMA = 8,
/// <summary>
/// datakit protocols [value = 9].
/// </summary>
AF_DATAKIT = 9,
/// <summary>
/// CCITT protocols, X.25 etc [value = 10].
/// </summary>
AF_CCITT = 10,
/// <summary>
/// IBM SNA [value = 11].
/// </summary>
AF_SNA = 11,
/// <summary>
/// DECnet [value = 12].
/// </summary>
AF_DECnet = 12,
/// <summary>
/// Direct data link interface [value = 13].
/// </summary>
AF_DLI = 13,
/// <summary>
/// LAT [value = 14].
/// </summary>
AF_LAT = 14,
/// <summary>
/// NSC Hyperchannel [value = 15].
/// </summary>
AF_HYLINK = 15,
/// <summary>
/// AppleTalk [value = 16].
/// </summary>
AF_APPLETALK = 16,
/// <summary>
/// NetBios-style addresses [value = 17].
/// </summary>
AF_NETBIOS = 17,
/// <summary>
/// VoiceView [value = 18].
/// </summary>
AF_VOICEVIEW = 18,
/// <summary>
/// Protocols from Firefox [value = 19].
/// </summary>
AF_FIREFOX = 19,
/// <summary>
/// Somebody is using this! [value = 20].
/// </summary>
AF_UNKNOWN1 = 20,
/// <summary>
/// Banyan [value = 21].
/// </summary>
AF_BAN = 21,
/// <summary>
/// Native ATM Services [value = 22].
/// </summary>
AF_ATM = 22,
/// <summary>
/// Internetwork Version 6 [value = 23].
/// </summary>
AF_INET6 = 23,
/// <summary>
/// Microsoft Wolfpack [value = 24].
/// </summary>
AF_CLUSTER = 24,
/// <summary>
/// IEEE 1284.4 WG AF [value = 25].
/// </summary>
AF_12844 = 25,
/// <summary>
/// IrDA [value = 26].
/// </summary>
AF_IRDA = 26,
/// <summary>
/// Network Designers OSI & gateway enabled protocols [value = 28].
/// </summary>
AF_NETDES = 28,
/// <summary>
/// [value = 29].
/// </summary>
AF_TCNPROCESS = 29,
/// <summary>
/// [value = 30].
/// </summary>
AF_TCNMESSAGE = 30,
/// <summary>
/// [value = 31].
/// </summary>
AF_ICLFXBM = 31
}
internal enum SOCKET_TYPE_INT : int
{
/// <summary>
/// stream socket
/// </summary>
SOCK_STREAM = 1,
/// <summary>
/// datagram socket
/// </summary>
SOCK_DGRAM = 2,
/// <summary>
/// raw-protocol interface
/// </summary>
SOCK_RAW = 3,
/// <summary>
/// reliably-delivered message
/// </summary>
SOCK_RDM = 4,
/// <summary>
/// sequenced packet stream
/// </summary>
SOCK_SEQPACKET = 5
}
internal enum PROTOCOL_INT : int
{
//dummy for IP
IPPROTO_IP = 0,
//control message protocol
IPPROTO_ICMP = 1,
//internet group management protocol
IPPROTO_IGMP = 2,
//gateway^2 (deprecated)
IPPROTO_GGP = 3,
//tcp
IPPROTO_TCP = 6,
//pup
IPPROTO_PUP = 12,
//user datagram protocol
IPPROTO_UDP = 17,
//xns idp
IPPROTO_IDP = 22,
//IPv6
IPPROTO_IPV6 = 41,
//UNOFFICIAL net disk proto
IPPROTO_ND = 77,
IPPROTO_ICLFXBM = 78,
//raw IP packet
IPPROTO_RAW = 255,
IPPROTO_MAX = 256
}
// For 32-bit execution
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct WSAData
{
public Int16 version;
public Int16 highVersion;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
public String description;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
public String systemStatus;
public Int16 maxSockets;
public Int16 maxUdpDg;
public IntPtr vendorInfo;
}
[StructLayout(LayoutKind.Sequential)]
public struct CommContext
{
public uint inited;
public uint rbufsize;
public uint rbuf;
public uint r_in_container;
public uint left_in_container;
public uint next_in_container;
public uint wbufsize;
public uint wbuf;
public uint w_in_container;
public uint first_free;
public uint empty_container;
public uint socket;
public uint hdrtype;
public uint last_error;
public uint socket2;
public string RX_context;
public int port;
public uint async_header;
public string my_host_addr;
public override string ToString()
{
return port.ToString();
}
}
static void Main(string[] args)
{
CommContext cmt = new CommContext();
IntPtr cmtPtr = Marshal.AllocHGlobal(Marshal.SizeOf(cmt));
Marshal.StructureToPtr(cmt, cmtPtr, true);
string host = "LocalHost";
byte[] hostBytes = Encoding.UTF8.GetBytes(host + "\0");
IntPtr hostPtr = Marshal.AllocHGlobal(hostBytes.Length);
Marshal.Copy(hostBytes, 0, hostPtr, hostBytes.Length);
string username = "username";
byte[] usernameBytes = Encoding.UTF8.GetBytes(username + "\0");
IntPtr usernamePtr = Marshal.AllocHGlobal(usernameBytes.Length);
Marshal.Copy(usernameBytes, 0, usernamePtr, usernameBytes.Length);
string password = "password";
byte[] passwordBytes = Encoding.UTF8.GetBytes(password + "\0");
IntPtr passwordPtr = Marshal.AllocHGlobal(passwordBytes.Length);
Marshal.Copy(passwordBytes, 0, passwordPtr, passwordBytes.Length);
string shell_cmd = "shell_cmd";
byte[] shell_cmdBytes = Encoding.UTF8.GetBytes(shell_cmd + "\0");
IntPtr shell_cmdPtr = Marshal.AllocHGlobal(shell_cmdBytes.Length);
Marshal.Copy(shell_cmdBytes, 0, shell_cmdPtr, shell_cmdBytes.Length);
const int BUF_LEN = 256;
IntPtr errmsgPtr = new IntPtr(BUF_LEN);
int bLen = BUF_LEN;
WSAData data = new WSAData();
WSAStartup(0x201, out data);
IntPtr sio = socket(ADDRESS_FAMILIES_INT.AF_INET, SOCKET_TYPE_INT.SOCK_STREAM, PROTOCOL_INT.IPPROTO_TCP);
IntPtr sErr = socket(ADDRESS_FAMILIES_INT.AF_INET, SOCKET_TYPE_INT.SOCK_STREAM, PROTOCOL_INT.IPPROTO_TCP);
int results = WaitForLogon(cmtPtr, hostPtr, usernamePtr, passwordPtr, shell_cmdPtr, errmsgPtr, bLen, sio, sErr);
string error = Marshal.PtrToStringAuto(errmsgPtr);
}
}
}