ASP.NET中使用网络驱动器
搞了一个图片站点,图片放在机器A,后台管理网站放在机器B。既然是管理,少不了要对图片进行删除什么的。那象我们这种情况,该如何处理?
1、可以在机器A搞个WebService
2、也可以在机器A搞个远程调用
3、在机器A上将图片存放目录共享,然后机器B映射为网络驱动器
决定采用方法3。
步骤如下:
0、假设机器A(图片服务器), 计算机名为jsj-01,IP为192.168.0.1;
机器B(后台管理网站)
1、机器A和机器B都分别建立一个名字、密码相同的帐号,比如coder/123456。
2、机器A上将图片目录共享(img),将coder赋予读写权限。注意 共享和安全 两个地方都要赋。
3、新建两个类,代码如下(照抄可也,我也是抄的)
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Runtime.InteropServices;public class WNetHelper{ [DllImport("mpr.dll", EntryPoint = "WNetAddConnection2")] private static extern uint WNetAddConnection2(NetResource lpNetResource, string lpPassword, string lpUsername, uint dwFlags); [DllImport("Mpr.dll", EntryPoint = "WNetCancelConnection2")] private static extern uint WNetCancelConnection2(string lpName, uint dwFlags, bool fForce); [StructLayout(LayoutKind.Sequential)] public class NetResource { public int dwScope; public int dwType; public int dwDisplayType; public int dwUsage; public string lpLocalName; public string lpRemoteName; public string lpComment; public string lpProvider; } /// /// 为网络共享做本地映射 /// /// 访问用户名(windows系统需要加计算机名,如:comp-1\user-1) /// 访问用户密码 /// 网络共享路径(如:\\192.168.0.9\share) /// 本地映射盘符 /// public static uint WNetAddConnection(string username, string password, string remoteName, string localName) { NetResource netResource = new NetResource(); netResource.dwScope = 2; netResource.dwType = 1; netResource.dwDisplayType = 3; netResource.dwUsage = 1; netResource.lpLocalName = localName; netResource.lpRemoteName = remoteName.TrimEnd('\\'); uint result = WNetAddConnection2(netResource, password, username, 0); return result; } public static uint WNetCancelConnection(string name, uint flags, bool force) { uint nret = WNetCancelConnection2(name, flags, force); return nret; }}public class LogonImpersonate : IDisposable{ static public string DefaultDomain { get { return "."; } } const int LOGON32_LOGON_INTERACTIVE = 2; const int LOGON32_PROVIDER_DEFAULT = 0; [System.Runtime.InteropServices.DllImport("Kernel32.dll")] extern static int FormatMessage(int flag, ref IntPtr source, int msgid, int langid, ref string buf, int size, ref IntPtr args); [System.Runtime.InteropServices.DllImport("Kernel32.dll")] extern static bool CloseHandle(IntPtr handle); [System.Runtime.InteropServices.DllImport("Advapi32.dll", SetLastError = true)] extern static bool LogonUser( string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken ); IntPtr token; System.Security.Principal.WindowsImpersonationContext context; public LogonImpersonate(string username, string password) { if (username.IndexOf("\\") == -1) { Init(username, password, DefaultDomain); } else { string[] pair = username.Split(new char[] { '\\' }, 2); Init(pair[1], password, pair[0]); } } public LogonImpersonate(string username, string password, string domain) { Init(username, password, domain); } void Init(string username, string password, string domain) { if (LogonUser(username, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref token)) { bool error = true; try { context = System.Security.Principal.WindowsIdentity.Impersonate(token); error = false; } finally { if (error) CloseHandle(token); } } else { int err = System.Runtime.InteropServices.Marshal.GetLastWin32Error(); IntPtr tempptr = IntPtr.Zero; string msg = null; FormatMessage(0x1300, ref tempptr, err, 0, ref msg, 255, ref tempptr); throw (new Exception(msg)); } } ~LogonImpersonate() { Dispose(); } public void Dispose() { if (context != null) { try { context.Undo(); } finally { CloseHandle(token); context = null; } } }}
4、然后在后台管理网站中使用这个网路驱动器Z。使用的方法就是引用新写的这个类
protected void btnDelete_Click(object sender, EventArgs e) { //删除图片 using (LogonImpersonate imper = new LogonImpersonate("code", "123456")) { uint state = 0; if (!Directory.Exists("w:")) { state = WNetHelper.WNetAddConnection(@"jsj-01\coder", "123456", @"\\192.168.0.1\Img", "z:"); } if (!state.Equals(0)) { throw new Exception("添加网络驱动器错误,错误号:" + state.ToString()); } File.Delete(图片路径); } }
将共享目录映射为Z。
首先是将IIS的账户替换,然后访问网络驱动器。注意用上了using,目的是只在访问该网络驱动器的时候使用,用完即弃,恢复默认身份,否则其他的操作就不行了。
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