using System; using System.Runtime.InteropServices; namespace TimeFound.CTD.ResourceManager { /// /// IECache 的摘要说明。 /// public class IECache { public IECache() { // // TODO: 在此处添加构造函数逻辑 // } #region 引入所需要的Dll [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)] private struct INTERNET_CACHE_ENTRY_INFO { public int dwStructSize; public IntPtr lpszSourceUrlName; public IntPtr lpszLocalFileName; public int CacheEntryType; public int dwUseCount; public int dwHitRate; public int dwSizeLow; public int dwSizeHigh; public FILETIME LastModifiedTime; public FILETIME ExpireTime; public FILETIME LastAccessTime; public FILETIME LastSyncTime; public IntPtr lpHeaderInfo; public int dwHeaderInfoSize; public IntPtr lpszFileExtension; public int dwExemptDelta; } [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)] private struct SYSTEMTIME { public short wYear; public short wMonth; public short wDayOfWeek; public short wDay; public short wHour; public short wMinute; public short wSecond; public short wMilliseconds; } [DllImport("kernel32.dll",SetLastError=true, CharSet=CharSet.Auto)] private static extern int FileTimeToSystemTime( IntPtr lpFileTime, IntPtr lpSystemTime); [DllImport("wininet",SetLastError=true,CharSet=CharSet.Auto,EntryPoint="FindFirstUrlCacheGroup",CallingConvention=CallingConvention.StdCall)] private static extern IntPtr FindFirstUrlCacheGroup( int dwFlags, int dwFilter, IntPtr lpSearchCondition, int dwSearchCondition, ref long lpGroupId, IntPtr lpReserved); [DllImport("wininet",SetLastError=true,CharSet=CharSet.Auto,EntryPoint="FindNextUrlCacheGroup",CallingConvention=CallingConvention.StdCall)] private static extern bool FindNextUrlCacheGroup( IntPtr hFind, ref long lpGroupId, IntPtr lpReserved); [DllImport("wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="DeleteUrlCacheGroup", CallingConvention=CallingConvention.StdCall)] private static extern bool DeleteUrlCacheGroup( long GroupId, int dwFlags, IntPtr lpReserved); [DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)] private static extern IntPtr FindFirstUrlCacheEntry([MarshalAs(UnmanagedType.LPTStr)] string UrlSearchPattern, IntPtr lpFirstCacheEntryInfo, ref int lpdwFirstCacheEntryInfoBufferSize); [DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)] private static extern bool FindNextUrlCacheEntry( IntPtr hEnumHandle, IntPtr lpNextCacheEntryInfo, ref int lpdwNextCacheEntryInfoBufferSize); [DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)] private static extern bool GetUrlCacheEntryInfo( [MarshalAs(UnmanagedType.LPTStr)] string lpszUrlName, IntPtr lpCacheEntryInfo, ref int lpdwCacheEntryInfoBufferSize ); [DllImport("wininet.dll")] private static extern bool FindCloseUrlCache( IntPtr hEnumHandle); [DllImport("wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="DeleteUrlCacheEntryA", CallingConvention=CallingConvention.StdCall)] private static extern bool DeleteUrlCacheEntry( IntPtr lpszUrlName); const int ERROR_NO_MORE_ITEMS = 259; /// /// Retrieves the flags, type, and disk quota attributes of the cache group. This is used by the GetUrlCacheGroupAttribute function. /// const int CACHEGROUP_ATTRIBUTE_BASIC = 0x00000001; /// /// Sets or retrieves the flags associated with the cache group. This is used by the GetUrlCacheGroupAttribute and SetUrlCacheGroupAttribute functions. /// const int CACHEGROUP_ATTRIBUTE_FLAG =0x00000002; /// /// Retrieves all the attributes of the cache group. This is used by the GetUrlCacheGroupAttribute function. /// const uint CACHEGROUP_ATTRIBUTE_GET_ALL =0xffffffff; /// /// Sets or retrieves the group name of the cache group. This is used by the GetUrlCacheGroupAttribute and SetUrlCacheGroupAttribute functions. /// const int CACHEGROUP_ATTRIBUTE_GROUPNAME =0x000000010; /// /// Sets or retrieves the disk quota associated with the cache group. This is used by the GetUrlCacheGroupAttribute and SetUrlCacheGroupAttribute functions. /// const int CACHEGROUP_ATTRIBUTE_QUOTA =0x00000008; /// /// Sets or retrieves the group owner storage associated with the cache group. This is used by the GetUrlCacheGroupAttribute and SetUrlCacheGroupAttribute functions. /// const int CACHEGROUP_ATTRIBUTE_STORAGE =0x00000020; /// /// Sets or retrieves the cache group type. This is used by the GetUrlCacheGroupAttribute and SetUrlCacheGroupAttribute functions. /// const int CACHEGROUP_ATTRIBUTE_TYPE =0x00000004; /// /// Indicates that all the cache entries associated with the cache group should be deleted, unless the entry belongs to another cache group. /// const int CACHEGROUP_FLAG_FLUSHURL_ONDELETE =0x00000002; /// /// Indicates that the function should only create a unique GROUPID for the cache group and not create the actual group. /// const int CACHEGROUP_FLAG_GIDONLY = 0x00000004; /// /// Indicates that the cache group cannot be purged. /// const int CACHEGROUP_FLAG_NONPURGEABLE =0x00000001; /// /// Sets the type, disk quota, group name, and owner storage attributes of the cache group. This is used by the SetUrlCacheGroupAttribute function. /// const int CACHEGROUP_READWRITE_MASK =0x0000003c; /// /// Indicates that all of the cache groups in the user's system should be enumerated. /// const int CACHEGROUP_SEARCH_ALL =0x00000000; /// /// Not currently implemented. /// const int CACHEGROUP_SEARCH_BYURL =0x00000001; /// /// Indicates that the cache group type is invalid. /// const int CACHEGROUP_TYPE_INVALID =0x00000001; /// /// Length of the group owner storage array. /// const int GROUP_OWNER_STORAGE_SIZE =0x00000004; /// /// Maximum number of characters allowed for a cache group name. /// const int GROUPNAME_MAX_LENGTH =0x00000078; #endregion #region FileTimeToSystemTime private string FILETIMEtoDataTime(FILETIME time) { IntPtr filetime = Marshal.AllocHGlobal( Marshal.SizeOf(typeof(FILETIME)) ); IntPtr systime = Marshal.AllocHGlobal( Marshal.SizeOf(typeof(SYSTEMTIME)) ); Marshal.StructureToPtr(time,filetime,true); FileTimeToSystemTime( filetime ,systime); SYSTEMTIME st = (SYSTEMTIME) Marshal.PtrToStructure(systime,typeof(SYSTEMTIME)); string Time = st.wYear.ToString()+"."+st.wMonth.ToString()+"."+st.wDay.ToString()+"."+st.wHour.ToString()+"."+st.wMinute.ToString()+"."+st.wSecond.ToString(); return Time; } #endregion #region 加载数据 /// /// 获得指定的URL的cache文件名 /// /// URL /// 如果不存在该cache,返回空字符串 public string GetURLCacheFileName(string URL) { string s=""; int nNeeded = 0, nBufSize; IntPtr buf; INTERNET_CACHE_ENTRY_INFO CacheItem; FindFirstUrlCacheEntry( null, IntPtr.Zero, ref nNeeded ); if ( Marshal.GetLastWin32Error() == ERROR_NO_MORE_ITEMS ) return s; nBufSize = nNeeded; buf = Marshal.AllocHGlobal( nBufSize ); GetUrlCacheEntryInfo(URL,buf,ref nNeeded); try { CacheItem = (INTERNET_CACHE_ENTRY_INFO) Marshal.PtrToStructure( buf,typeof(INTERNET_CACHE_ENTRY_INFO) ); s=Marshal.PtrToStringAuto(CacheItem.lpszLocalFileName);
/* 以下这一段儿写的有些弱智。。。。但是没有办法。。。。不知道为什么,通过上面的方法取出来的文件的Cache路径,有时候是乱码,有时候用PtrToStringAnsi可是又正常。。。。。唉,所以只能用这个笨办法。。。。 */ if(s.IndexOf("Temporary Internet Files")==-1) s=Marshal.PtrToStringAnsi(CacheItem.lpszLocalFileName); if(s.IndexOf("Temporary Internet Files")==-1) s=Marshal.PtrToStringBSTR(CacheItem.lpszLocalFileName); if(s.IndexOf("Temporary Internet Files")==-1) s=Marshal.PtrToStringUni(CacheItem.lpszLocalFileName); } catch(System.Exception ex) { Console.WriteLine(ex.Message + ex.StackTrace); } Marshal.FreeHGlobal( buf ); return s; } public void GetCacheFile() { int nNeeded = 0, nBufSize; IntPtr buf; INTERNET_CACHE_ENTRY_INFO CacheItem; IntPtr hEnum; bool r; FindFirstUrlCacheEntry( null, IntPtr.Zero, ref nNeeded ); if ( Marshal.GetLastWin32Error() == ERROR_NO_MORE_ITEMS ) return; nBufSize = nNeeded; buf = Marshal.AllocHGlobal( nBufSize ); hEnum = FindFirstUrlCacheEntry( null, buf, ref nNeeded ); while ( true ) { CacheItem = (INTERNET_CACHE_ENTRY_INFO) Marshal.PtrToStructure( buf, typeof(INTERNET_CACHE_ENTRY_INFO) ); string modifiedTime = FILETIMEtoDataTime(CacheItem.LastModifiedTime); string expireTime = FILETIMEtoDataTime(CacheItem.ExpireTime); string accessTime = FILETIMEtoDataTime(CacheItem.LastAccessTime); string syncTime = FILETIMEtoDataTime(CacheItem.LastSyncTime); string s; #region 获得数据 try { s = Marshal.PtrToStringAuto(CacheItem.lpszSourceUrlName) + System.Environment.NewLine + " ===> " + Marshal.PtrToStringAuto(CacheItem.lpszLocalFileName) + System.Environment.NewLine+ " ==> " + Marshal.PtrToStringAuto(CacheItem.lpHeaderInfo)+ System.Environment.NewLine + Marshal.PtrToStringAuto(CacheItem.lpszFileExtension); Console.WriteLine(s); } catch { } #endregion nNeeded = nBufSize; r = FindNextUrlCacheEntry( hEnum, buf, ref nNeeded ); if ( !r && Marshal.GetLastWin32Error() == ERROR_NO_MORE_ITEMS ) break; if ( !r && nNeeded > nBufSize ) { nBufSize = nNeeded; buf = Marshal.ReAllocHGlobal( buf, (IntPtr) nBufSize ); FindNextUrlCacheEntry( hEnum, buf, ref nNeeded ); } } Marshal.FreeHGlobal( buf ); } #endregion } }

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