搞了一個圖片網站,圖片放在機器A,後台管理網站放在機器B。既然是管理,少不了要對圖片進行刪除什麼的。那象我們這種情況,該如何處理?
1、可以在機器A搞個WebService
2、也可以在機器A搞個遠程調用
3、在機器A上將圖片存放目錄共用,然後機器B映射為網路磁碟機
決定採用方法3。
步驟如下:
0、假設機器A(圖片伺服器), 電腦名稱為jsj-01,IP為192.168.0.1;
機器B(後台管理網站)
1、機器A和機器B都分別建立一個名字、密碼相同的帳號,比如coder/123456。
2、機器A上將圖片目錄共用(img),將coder賦予讀寫權限。注意 共用和安全 兩個地方都要賦。
3、建立兩個類,代碼如下(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; } /// <summary> /// 為網際網路共用做本機對應 /// </summary> /// <param name="username">訪問使用者名稱(windows系統需要加電腦名稱,如:comp-1\user-1)</param> /// <param name="password">訪問使用者密碼</param> /// <param name="remoteName">網際網路共用路徑(如:\\192.168.0.9\share)</param> /// <param name="localName">本機對應盤符</param> /// <returns></returns> 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、然後在後台管理網站中使用這個網路磁碟機Z。使用的方法就是引用新寫的這個類
protected void btnDelete_Click(object sender, EventArgs e) { //刪除圖片 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("添加網路磁碟機錯誤,錯誤號碼:" + state.ToString()); } File.Delete(圖片路徑); } }
將共用目錄映射為Z。
首先是將IIS的賬戶替換,然後訪問網路磁碟機。注意用上了using,目的是只在訪問該網路磁碟機的時候使用,用完即棄,恢複預設身份,否則其他的操作就不行了。
參考文章
http://www.cnblogs.com/sqzhuyi/archive/2011/01/15/aspnet-remote.html