C# 带用户密码访问网络共享

原文:C# 带用户密码访问网络共享

调用WNetUseConnection API

函数详细参数参考：https://msdn.microsoft.com/en-us/library/windows/desktop/aa385482(v=vs.85).aspx

C# 调用WNetUseConnection连接共享类的代码：

NetworkShareConnect.cs

//引入命名空间
//using System.Runtime.InteropServices;

public class NetworkShareConnect
    {
        #region WNetUseConnection枚举参数
        //dwScope
        const int RESOURCE_CONNECTED = 0x00000001;
        const int RESOURCE_GLOBALNET = 0x00000002;
        const int RESOURCE_REMEMBERED = 0x00000003;

        //dwType
        const int RESOURCETYPE_ANY = 0x00000000;
        const int RESOURCETYPE_DISK = 0x00000001;
        const int RESOURCETYPE_PRINT = 0x00000002;

        //dwDisplayType
        const int RESOURCEDISPLAYTYPE_GENERIC = 0x00000000;
        const int RESOURCEDISPLAYTYPE_DOMAIN = 0x00000001;
        const int RESOURCEDISPLAYTYPE_SERVER = 0x00000002;
        const int RESOURCEDISPLAYTYPE_SHARE = 0x00000003;
        const int RESOURCEDISPLAYTYPE_FILE = 0x00000004;
        const int RESOURCEDISPLAYTYPE_GROUP = 0x00000005;

        //dwUsage
        const int RESOURCEUSAGE_CONNECTABLE = 0x00000001;
        const int RESOURCEUSAGE_CONTAINER = 0x00000002;

        //dwFlags
        const int CONNECT_INTERACTIVE = 0x00000008;
        const int CONNECT_PROMPT = 0x00000010;
        const int CONNECT_REDIRECT = 0x00000080;
        const int CONNECT_UPDATE_PROFILE = 0x00000001;
        const int CONNECT_COMMANDLINE = 0x00000800;
        const int CONNECT_CMD_SAVECRED = 0x00001000;

        const int CONNECT_LOCALDRIVE = 0x00000100;
        #endregion

        #region Errors参数
        const int NO_ERROR = 0;

        const int ERROR_ACCESS_DENIED = 5;
        const int ERROR_ALREADY_ASSIGNED = 85;
        const int ERROR_BAD_DEVICE = 1200;
        const int ERROR_BAD_NET_NAME = 67;
        const int ERROR_BAD_PROVIDER = 1204;
        const int ERROR_CANCELLED = 1223;
        const int ERROR_EXTENDED_ERROR = 1208;
        const int ERROR_INVALID_ADDRESS = 487;
        const int ERROR_INVALID_PARAMETER = 87;
        const int ERROR_INVALID_PASSWORD = 1216;
        const int ERROR_MORE_DATA = 234;
        const int ERROR_NO_MORE_ITEMS = 259;
        const int ERROR_NO_NET_OR_BAD_PATH = 1203;
        const int ERROR_NO_NETWORK = 1222;

        const int ERROR_BAD_PROFILE = 1206;
        const int ERROR_CANNOT_OPEN_PROFILE = 1205;
        const int ERROR_DEVICE_IN_USE = 2404;
        const int ERROR_NOT_CONNECTED = 2250;
        const int ERROR_OPEN_FILES = 2401;

        private struct ErrorClass
        {
            //定义错误类结构体
            public int num;
            public string message;
            public ErrorClass(int num, string message)
            {
                this.num = num;
                this.message = message;
            }
        }

        //连接失败信息汇总
        private static ErrorClass[] ERROR_LIST = new ErrorClass[] {
            new ErrorClass(ERROR_ACCESS_DENIED, "Error: Access Denied"),
            new ErrorClass(ERROR_ALREADY_ASSIGNED, "Error: Already Assigned"),
            new ErrorClass(ERROR_BAD_DEVICE, "Error: Bad Device"),
            new ErrorClass(ERROR_BAD_NET_NAME, "Error: Bad Net Name"),
            new ErrorClass(ERROR_BAD_PROVIDER, "Error: Bad Provider"),
            new ErrorClass(ERROR_CANCELLED, "Error: Cancelled"),
            new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"),
            new ErrorClass(ERROR_INVALID_ADDRESS, "Error: Invalid Address"),
            new ErrorClass(ERROR_INVALID_PARAMETER, "Error: Invalid Parameter"),
            new ErrorClass(ERROR_INVALID_PASSWORD, "Error: Invalid Password"),
            new ErrorClass(ERROR_MORE_DATA, "Error: More Data"),
            new ErrorClass(ERROR_NO_MORE_ITEMS, "Error: No More Items"),
            new ErrorClass(ERROR_NO_NET_OR_BAD_PATH, "Error: No Net Or Bad Path"),
            new ErrorClass(ERROR_NO_NETWORK, "Error: No Network"),
            new ErrorClass(ERROR_BAD_PROFILE, "Error: Bad Profile"),
            new ErrorClass(ERROR_CANNOT_OPEN_PROFILE, "Error: Cannot Open Profile"),
            new ErrorClass(ERROR_DEVICE_IN_USE, "Error: Device In Use"),
            new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"),
            new ErrorClass(ERROR_NOT_CONNECTED, "Error: Not Connected"),
            new ErrorClass(ERROR_OPEN_FILES, "Error: Open Files"),
        };

        private static string getErrorForNumber(int errNum)
        {
            //遍历获得错误代码
            foreach (ErrorClass er in ERROR_LIST)
            {
                if (er.num == errNum) return er.message;
            }
            return "Error: Unknown, " + errNum;
        }
        #endregion

        //调用系统函数WNetUseConnection
        //用于连接共享
        [DllImport("Mpr.dll")]
        private static extern int WNetUseConnection(
            IntPtr hwndOwner,
            NETRESOURCE lpNetResource,
            string lpPassword,
            string lpUserID,
            int dwFlags,
            string lpAccessName,
            string lpBufferSize,
            string lpResult
            );
        //用于删除连接
        [DllImport("Mpr.dll")]
        private static extern int WNetCancelConnection2(
            string lpName,
            int dwFlags,
            bool fForce
            );

        [StructLayout(LayoutKind.Sequential)]
        private class NETRESOURCE
        {
            public int dwScope = 0;
            public int dwType = 0;
            public int dwDisplayType = 0;
            public int dwUsage = 0;
            public string lpLocalName = "";//映射到本地的盘符，如"Z:"。不做驱动器映射，可为空
            public string lpRemoteName = "";//共享的网络路径
            public string lpComment = "";
            public string lpProvider = "";
        }

        /// <summary>
        /// 连接共享
        /// </summary>
        /// <param name="remoteUNC">共享网络路径</param>
        /// <param name="username">登录用户名</param>
        /// <param name="password">密码</param>
        /// <returns></returns>
        public static string connectToShare(string remoteUNC, string username, string password)
        {
            return connectToRemote(remoteUNC, username, password, false);
        }

        /// <summary>
        /// 没用户密码连接
        /// </summary>
        /// <param name="remoteUNC">共享网络路径</param>
        /// <returns></returns>
        public static string connectToShare(string remoteUNC)
        {
            return connectToRemote(remoteUNC, "", "", true);
        }

        private static string connectToRemote(string remoteUNC, string username, string password, bool promptUser)
        {
            NETRESOURCE nr = new NETRESOURCE
            {
                dwType = RESOURCETYPE_DISK,
                lpRemoteName = remoteUNC
            };

            int ret;
            if (promptUser)
                ret = WNetUseConnection(IntPtr.Zero, nr, "", "", CONNECT_INTERACTIVE | CONNECT_PROMPT, null, null, null);
            else
                ret = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);

            if (ret == NO_ERROR) return null;
            return getErrorForNumber(ret);
        }

        public static string disconnectRemote(string remoteUNC)
        {
            int ret = WNetCancelConnection2(remoteUNC, CONNECT_UPDATE_PROFILE, false);
            if (ret == NO_ERROR) return null;
            return getErrorForNumber(ret);
        }
    }

测试：

注意：断开共享后，系统缓存还在，没能即时失去连接，在1-3分钟内仍然可以访问共享。

有时候要注销才能失去连接，原因未明 %>_<%