根据一个路径下载局域网文件
本帖最后由 Dumbo_ 于 2013-07-31 18:06:38 编辑 根据一个文件的路径和用户名密码从局域网上把他下下来，求代码解释。545283307@qq.com求源码。 C# WINFORM 局域网 下载
[解决办法]
/// <summary>
/// Provides access to a network share.
/// </summary>
public class NetworkShareAccesser : IDisposable
{
private string _remoteUncName;
private string _remoteComputerName;

public string RemoteComputerName
{
get
{
return this._remoteComputerName;
}
set
{
this._remoteComputerName = value;
this._remoteUncName = @"\\" + this._remoteComputerName;
}
}

public string UserName
{
get;
set;
}
public string Password
{
get;
set;
}

#region Consts

private const int RESOURCE_CONNECTED = 0x00000001;
private const int RESOURCE_GLOBALNET = 0x00000002;
private const int RESOURCE_REMEMBERED = 0x00000003;

private const int RESOURCETYPE_ANY = 0x00000000;
private const int RESOURCETYPE_DISK = 0x00000001;

private const int RESOURCETYPE_PRINT = 0x00000002;

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

private const int RESOURCEUSAGE_CONNECTABLE = 0x00000001;
private const int RESOURCEUSAGE_CONTAINER = 0x00000002;


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

private const int CONNECT_LOCALDRIVE = 0x00000100;

#endregion

#region Errors

private const int NO_ERROR = 0;

private const int ERROR_ACCESS_DENIED = 5;
private const int ERROR_ALREADY_ASSIGNED = 85;
private const int ERROR_BAD_DEVICE = 1200;
private const int ERROR_BAD_NET_NAME = 67;
private const int ERROR_BAD_PROVIDER = 1204;
private const int ERROR_CANCELLED = 1223;
private const int ERROR_EXTENDED_ERROR = 1208;
private const int ERROR_INVALID_ADDRESS = 487;
private const int ERROR_INVALID_PARAMETER = 87;
private const int ERROR_INVALID_PASSWORD = 1216;
private const int ERROR_MORE_DATA = 234;

private const int ERROR_NO_MORE_ITEMS = 259;
private const int ERROR_NO_NET_OR_BAD_PATH = 1203;
private const int ERROR_NO_NETWORK = 1222;

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

#endregion

#region PInvoke Signatures

[DllImport("Mpr.dll")]
private static extern int WNetUseConnection(
IntPtr hwndOwner,
NETRESOURCE lpNetResource,
string lpPassword,
string lpUserID,
int dwFlags,
string lpAccessName,
string lpBufferSize,
string lpResult
);

[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 = "";
public string lpRemoteName = "";
public string lpComment = "";

public string lpProvider = "";
}

#endregion

/// <summary>
/// Creates a NetworkShareAccesser for the given computer name. The user will be promted to enter credentials
/// </summary>
/// <param name="remoteComputerName"></param>
/// <returns></returns>
public static NetworkShareAccesser Access(string remoteComputerName)
{
return new NetworkShareAccesser(remoteComputerName);
}

/// <summary>
/// Creates a NetworkShareAccesser for the given computer name using the given domain/computer name, username and password
/// </summary>
/// <param name="remoteComputerName"></param>
/// <param name="domainOrComuterName"></param>
/// <param name="userName"></param>
/// <param name="password"></param>
public static NetworkShareAccesser Access(string remoteComputerName, string domainOrComuterName, string userName, string password)
{
return new NetworkShareAccesser(remoteComputerName,
domainOrComuterName + @"\" + userName,
password);
}

/// <summary>
/// Creates a NetworkShareAccesser for the given computer name using the given username (format: domainOrComputername\Username) and password
/// </summary>
/// <param name="remoteComputerName"></param>

/// <param name="userName"></param>
/// <param name="password"></param>
public static NetworkShareAccesser Access(string remoteComputerName, string userName, string password)
{
return new NetworkShareAccesser(remoteComputerName,
userName,
password);
}

private NetworkShareAccesser(string remoteComputerName)
{
RemoteComputerName = remoteComputerName;

this.ConnectToShare(this._remoteUncName, null, null, true);
}

private NetworkShareAccesser(string remoteComputerName, string userName, string password)
{
RemoteComputerName = remoteComputerName;
UserName = userName;
Password = password;

this.ConnectToShare(this._remoteUncName, this.UserName, this.Password, false);
}

private void ConnectToShare(string remoteUnc, string username, string password, bool promptUser)
{
NETRESOURCE nr = new NETRESOURCE
{
dwType = RESOURCETYPE_DISK,
lpRemoteName = remoteUnc
};

int result;
if (promptUser)
{
result = WNetUseConnection(IntPtr.Zero, nr, "", "", CONNECT_INTERACTIVE

[解决办法]
CONNECT_PROMPT, null, null, null);
}
else
{
result = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);
}

if (result != NO_ERROR)
{
throw new Win32Exception(result);
}
}

private void DisconnectFromShare(string remoteUnc)
{
int result = WNetCancelConnection2(remoteUnc, CONNECT_UPDATE_PROFILE, false);
if (result != NO_ERROR)
{
throw new Win32Exception(result);
}
}

/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
/// <filterpriority>2</filterpriority>
public void Dispose()
{
this.DisconnectFromShare(this._remoteUncName);
}
}