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            引自:http://www.codeproject.com/KB/miscctrl/ManageBrowser.aspx?display=Print

            Introduction

            This is a little program which helps you to see what your Internet Explorer stores about you. Additionally, it allows you to delete some of the files.

            Background

            Why this program? The Internet Explorer allows you to delete its cache, the browser's history and your cookies. So for what reason should you need this program?
            Well, unfortunately the mentioned deleting is only half the truth. In fact, deleting your cache within the Internet Explorer means, that only your cache files will be removed. These files are in your users' directory under ..\Temporary Internet Files\Content.IE5 in subdirectories, which have such funny names like "09WJE130".
            But there is another file, which contains all your visited internet links, storing them for a long, long time: "index.dat".
            This file usually has a size of some MB. If you open it with a text editor and scroll down, you will detect hundreds of links in a readable form. And: this file will never be deleted by means of Internet Explorer.
            So I've written this program to reveal, what your browser stores about you. And I want to give you the possibility to delete some of these annoying files.

            Using the Code

            As you can see in the image above, the main program contains a TabControl with six TabPages. Each of these TabPages allows you to administer a special part of the browser's files.

            So let's begin with the TabPage Browser's URLs history, which appears after program start.
            Background: If you would delete the browser's history in the Internet Explorer, all the previous visited links in the dropdown list of your browser would vanish. All these links are stored in the registry under "HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\TypedURLs" and after deletion, all the keys and values are gone. But sometimes, it's useful not to delete all of them or to store them in an own list to reuse them later (ok, there a favourites, I know...). Therefore, I've introduced two lists: the actual browser's history and a file, which stores my personal list.
            The functionality within the TabPage above allows you to delete parts of your browser's history, store some links in your personal list or restore links from your personal list to the history.?In the following you can see?the function, which gets the TypedURLs from the registry and stores them in a listview.

            // registry branch for typed URLs (browser history)
            publicconststring REG_URL = "SOFTWARE\\MICROSOFT\\INTERNET EXPLORER\\TYPEDURLS";
            // registry branch for Internet Explorer
            publicconststring REG_URL_SHORT = "SOFTWARE\\MICROSOFT\\INTERNET EXPLORER";
            ///<summary>
            /// One element of the registry browser's history
            ///</summary>
            publicstruct histlink
            {
            // Entry name
            publicstring Entry;
            // URL
            publicstring URL;
            }
            // Holds all values (URLs) from the registry browser's history
            publicstatic SortedList<int, histlink> historylinks = new SortedList<int, histlink>();
            ///<summary>
            /// Gets all the URL links from the registry and stores them in the
            /// SortedList historylinks.
            ///</summary>
            publicvoid GetHistory()
            {
            historylinks.Clear();
            using (RegistryKey tempKey = Registry.CurrentUser.OpenSubKey(REG_URL))
            {
            if (tempKey == null)
            {
            // try to set the registry entry
            using (RegistryKey tempKeyShort =
            Registry.CurrentUser.OpenSubKey(REG_URL_SHORT, true))
            {
            if (tempKeyShort == null)
            {
            System.Windows.Forms.MessageBox.Show(
            "The registry entry for " + REG_URL_SHORT + " does not exist!",
            "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
            }
            else
            {
            tempKeyShort.CreateSubKey("TypedURLs",
            RegistryKeyPermissionCheck.ReadWriteSubTree);
            }
            } // using
            } // if
            } // using
            // try it again
            using (RegistryKey tempKey = Registry.CurrentUser.OpenSubKey(REG_URL))
            {
            if (tempKey == null)
            {
            System.Windows.Forms.MessageBox.Show(
            "The registry entry for " + REG_URL + " does not exist!",
            "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
            } // if
            // get all keys
            string[] vals = tempKey.GetValueNames();
            int itemcounter = 0;
            foreach (string url in vals)
            {
            object keyValue = tempKey.GetValue(url);
            if (keyValue != null)
            {
            histlink hl = new histlink();
            string entry = keyValue.ToString();
            if (entry.Length != 0)
            {
            itemcounter++;
            hl.Entry = entry;
            hl.URL = url;
            historylinks.Add(itemcounter, hl);
            } // if
            } // if
            } // foreach
            } // using
            } // GetHistory

            The second TabPage Cache shows the browser's cache. On the one hand, there are the lots of cache files as mentioned above, e.g. 30,667 MB in 7991 cache files. You can delete them by pressing the button "Delete cache files". On the other hand, you can have some insight into "index.dat" by pressing "Show Index.dat". As this file is locked by many processes, it's not easy to delete it. So I've implemented a function "DeleteCacheIndexDat", which marks the file to be deleted on reboot (Button "Delete on reboot"). This function is a wrapper for MoveFileEx:

            // delete file on reboot
            [System.Runtime.InteropServices.DllImport("kernel32.dll")]
            privatestaticexternbool MoveFileEx(string lpExistingFileName,
            string lpNewFileName, int dwFlags);
            constint MOVEFILE_DELAY_UNTIL_REBOOT = 0x00000004;
            MoveFileEx(fileName, null, MOVEFILE_DELAY_UNTIL_REBOOT);

            You can store some of the links in your personal list. To do so, select the links and press "Store selected". The lower listview on TabPage "Browser's URLs history", which holds your personal links, will be updated immediately.

            The third TabPage History (Autofill) shows the browser's history, which is stored in a couple of "index.dat" files in your "Local Settings\History\History.IE5" directory and subdirectories. The links in these directories are responsible for the autofill mechanism in your browser's dropdown list. Some of these files (the older ones) can be deleted immediately, the others have to be deleted by means of "MoveFileEx". Use the buttons "Show history" and "Delete on reboot" to watch and delete the links.
            You can also, as described above, store some links to your personal URL list.

            The fourth TabPage Cookies shows your cookies. They are both stored in a file "index.dat" in your "Cookies" directory and as single .txt-files, each of them representing one cookie. Again, the "index.dat" can only be deleted on reboot, but the ".txt" cookie files can be deleted one by one. If you press "Show cookie files", the cookies and their third lines will be shown in the listview. The third line contains the cookie's URL. Use the button "Delete on reboot" to delete the cookie's index.dat file.
            Again, you can overtake here some links to your personal URL list.

            The fifth TabPage Recent list shows the list of the files you recently used. These are not specific browser links, but they are - sometimes - annoying too. You can get rid of them (or parts of them) by selecting and pressing "Delete selected". By the way: these links are on your "Recent" directory and have the suffix ".lnk".

            The sixth TabPage Delete all gives you the functionality to delete all that stuff at one go. You can reduce the overall deleting by unchecking some of the items. The deletion progress is shown by a progress bar.

            Some Remarks on the Code

            Not to have all the code in one large file, I've divided it up into several parts, meaning that every TabPage has its own source file. You can easily distinguish the parts, as they have the same name as the TabPages. All these source files are part of the class Main:

            publicpartialclass Main : Form 

            The program has been tested on Microsoft XP with Internet Explorer 6.0 and 7.0 and on Vista Home Premium with Internet Explorer 7.0. I've developed the solution with Visual Studio 2005, but it seems to work with Visual Studio 2008 as well.

            Outlook - what to do:
            It would be nice, if somebody could help me to show how a file, being locked by a couple of processes, can be deleted immediately. This should be done especially for the index.dat files to avoid deletion on reboot.

            History

            • March 3rd, 2009 - First version

            License

            This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


            posted on 2011-06-10 15:18 jemmyLiu 閱讀(159) 評論(0)  編輯 收藏 引用
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