[攒分贴]每日小知识

jinjazz 2008-07-14 03:12:54

wininet.dll示例4：根据url获取ie缓存文件

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

namespace ConsoleApplication34

{

    class Program

    {

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

        public 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;

        }

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

        public static extern IntPtr FindFirstUrlCacheEntry([MarshalAs(UnmanagedType.LPTStr)]   string urlsearchpattern, IntPtr lpfirstcacheentryinfo, ref   int lpdwfirstcacheentryinfobuffersize);

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

        public static extern bool GetUrlCacheEntryInfo([MarshalAs(UnmanagedType.LPTStr)]   string lpszurlname, IntPtr lpcacheentryinfo, ref   int lpdwcacheentryinfobuffersize);

        public static string getcatchfilename(string url)

        {

            int nneeded = 0, nbufsize = 0;

            IntPtr buf = IntPtr.Zero;

            FindFirstUrlCacheEntry(null, IntPtr.Zero, ref   nneeded);

            nbufsize = nneeded; buf = Marshal.AllocHGlobal(nbufsize);

            internet_cache_entry_info cacheitem;

            GetUrlCacheEntryInfo(url, buf, ref   nneeded);

            cacheitem = (internet_cache_entry_info)Marshal.PtrToStructure(buf, typeof(internet_cache_entry_info));

            string res = Marshal.PtrToStringAuto(cacheitem.lpszlocalfilename);

            return (res);

        }



        static void Main(string[] args)

        {

            string str = getcatchfilename("http://profile.csdn.net/jinjazz/picture/2.jpg");

            Console.WriteLine(str);

            Console.Read();

        }

    }

}