using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Runtime.InteropServices;

using System.Text;

namespace Common

{

    class Program

    {//从ＩＥ缓存复制图片到Ｄ盘

        static void Main(string[] args)

        {

            System.Diagnostics.Process.Start(" http://www.baidu.com ");

            System.Threading.Thread.Sleep();

            //打开ＩＥ缓存目录

            Process.Start(Environment.GetFolderPath(Environment.SpecialFolder.InternetCache));

            IECache i = new IECache();

            //在网页上找到百度logo图片的url写在下面

            string b = i.GetPathForCachedFile("https://www.baidu.com/img/bd_logo1.png");

            Console.WriteLine(b);

            //从缓存中将bd_logo1.png拷贝到Ｄ盘下

            File.Copy(b, @"d:\bd_logo1.png", true);

            Console.WriteLine("现在打开Ｄ盘目录看看bd_logo1.png吧");

            Console.ReadKey();

        }

        public class IECache

        {

            [DllImport("Wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

            public static extern Boolean GetUrlCacheEntryInfo(String lpxaUrlName, IntPtr lpCacheEntryInfo, ref int lpdwCacheEntryInfoBufferSize);

            const int ERROR_FILE_NOT_FOUND = 0x2;

            struct LPINTERNET_CACHE_ENTRY_INFO

            {

                public int dwStructSize;

                IntPtr lpszSourceUrlName;

                public IntPtr lpszLocalFileName;

               // int CacheEntryType;

               // int dwUseCount;

               // int dwHitRate;

                //int dwSizeLow;

               // int dwSizeHigh;

                //System.Runtime.InteropServices.ComTypes.FILETIME LastModifiedTime;

                //System.Runtime.InteropServices.ComTypes.FILETIME Expiretime;

               // System.Runtime.InteropServices.ComTypes.FILETIME LastAccessTime;

                //System.Runtime.InteropServices.ComTypes.FILETIME LastSyncTime;

                //IntPtr lpHeaderInfo;

                //readonly int dwheaderInfoSize;

                //IntPtr lpszFileExtension;

                //int dwEemptDelta;

            }

            // 返回 指定URL文件的缓存在本地文件系统中的路径

            public string GetPathForCachedFile(string fileUrl)

            {

                int cacheEntryInfoBufferSize = ;

                IntPtr cacheEntryInfoBuffer = IntPtr.Zero;

                int lastError; Boolean result;

                try

                {

                    result = GetUrlCacheEntryInfo(fileUrl, IntPtr.Zero, ref cacheEntryInfoBufferSize);

                    lastError = Marshal.GetLastWin32Error();

                    if (result == false)

                    {

                        if (lastError == ERROR_FILE_NOT_FOUND)

                            return null;

                    }

                    cacheEntryInfoBuffer = Marshal.AllocHGlobal(cacheEntryInfoBufferSize);

                    result = GetUrlCacheEntryInfo(fileUrl, cacheEntryInfoBuffer, ref cacheEntryInfoBufferSize);

                    lastError = Marshal.GetLastWin32Error();

                    if (result == true)

                    {

                        Object strObj = Marshal.PtrToStructure(cacheEntryInfoBuffer, typeof(LPINTERNET_CACHE_ENTRY_INFO));

                        LPINTERNET_CACHE_ENTRY_INFO internetCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO)strObj;

                        String localFileName = Marshal.PtrToStringAuto(internetCacheEntry.lpszLocalFileName); return localFileName;

                    }

                    else

                        return null;// file not found

                }

                finally

                {

                    if (!cacheEntryInfoBuffer.Equals(IntPtr.Zero))

                        Marshal.FreeHGlobal(cacheEntryInfoBuffer);

                }

            }

        }

    }

}