如何在包含子文件夹和文件的独立存储中压缩和解压缩根文件夹

时间:2011-10-27 16:53:14

标签: c# .net windows-phone-7 zip windows-phone-7.1

我在使用带有WP7中的隔离存储的SharpZipLib到孤立存储中的子文件夹时遇到问题。我的文件夹结构就像我在隔离存储中有一个 rootFolder ,里面有 subFolder 有一些文本文件和更多子文件夹(包含.jpg和.png)。我可以去Dotnetzip,但我不确定它是否适用于WP7以及它的用途。

  1. 我可以通过递归遍历根文件夹来获取列表中的所有文件路径。目前我能够压缩多个文件,但只能在单个文件夹中。

  2. 找不到使用正确的文件夹和文件结构层次结构压缩subFolder的方法,并将其保存在独立存储中。还需要使用正确的文件夹和文件结构解压缩。

1 个答案:

答案 0 :(得分:1)

对于Silverlight / Windows Phone 7,您可以使用SharpZipLib执行此操作。

以下代码基于this example,演示了如何压缩包含子文件夹和文件的根文件夹。

简短概述:

  • button1_Click准备一些虚拟文件夹和文件以进行概念验证:包含文件的文件夹 root 和两个子文件夹,每个文件夹也包含一个文件,然后是调用CreateZip来压缩以 root
  • 开头的整个目录树
  • CreateZip准备zip文件并通过调用CompressFolder启动递归文件夹压缩
  • CompressFolder将给定目录中的所有文件添加到zip文件并递归到子目录

代码:

    using System.IO.IsolatedStorage;
    using ICSharpCode.SharpZipLib.Zip;
    using ICSharpCode.SharpZipLib.Core;
    using System.Text;

    // Recurses down the folder structure
    //
    private void CompressFolder(string path, ZipOutputStream zipStream, int folderOffset, IsolatedStorageFile isf)
    {

        string[] files = isf.GetFileNames(System.IO.Path.Combine(path, "*.*"));

        foreach (string filename in files)
        {
            string filenameWithPath = System.IO.Path.Combine(path, filename);
            string entryName = filenameWithPath.Substring(folderOffset); // Makes the name in zip based on the folder
            entryName = ZipEntry.CleanName(entryName); // Removes drive from name and fixes slash direction
            ZipEntry newEntry = new ZipEntry(entryName);
            newEntry.DateTime = isf.GetLastWriteTime(filenameWithPath).DateTime; // Note the zip format stores 2 second granularity

            // To permit the zip to be unpacked by built-in extractor in WinXP and Server2003, WinZip 8, Java, and other older code,
            // you need to do one of the following: Specify UseZip64.Off, or set the Size.
            // If the file may be bigger than 4GB, or you do not need WinXP built-in compatibility, you do not need either,
            // but the zip will be in Zip64 format which not all utilities can understand.
            //   zipStream.UseZip64 = UseZip64.Off;
            using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(filenameWithPath, System.IO.FileMode.Open, isf))
            {
                newEntry.Size = stream.Length;
            }

            zipStream.PutNextEntry(newEntry);

            // Zip the file in buffered chunks
            // the "using" will close the stream even if an exception occurs
            byte[] buffer = new byte[4096];
            using (IsolatedStorageFileStream streamReader = isf.OpenFile(filenameWithPath, System.IO.FileMode.Open))
            {
                StreamUtils.Copy(streamReader, zipStream, buffer);
            }
            zipStream.CloseEntry();
        }
        string[] folders = isf.GetDirectoryNames(System.IO.Path.Combine(path, "*.*"));
        foreach (string folder in folders)
        {
            CompressFolder(System.IO.Path.Combine(path, folder), zipStream, folderOffset, isf);
        }
    }

    // Compresses the files in the nominated folder, and creates a zip file on disk named as outPathname.
    //
    public void CreateZip(string outPathname, string password, string folderName)
    {

        using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
        {
            using (IsolatedStorageFileStream fsOut = new IsolatedStorageFileStream(outPathname, System.IO.FileMode.Create, isf))
            {
                ZipOutputStream zipStream = new ZipOutputStream(fsOut);

                zipStream.SetLevel(3); //0-9, 9 being the highest level of compression

                zipStream.Password = password;  // optional. Null is the same as not setting.

                // This setting will strip the leading part of the folder path in the entries, to
                // make the entries relative to the starting folder.
                // To include the full path for each entry up to the drive root, assign folderOffset = 0.

                // int folderOffset = folderName.Length + (folderName.EndsWith("\\") ? 0 : 1); // hu: currently not used for WP7 sample
                int folderOffset = 0;

                CompressFolder(folderName, zipStream, folderOffset, isf);

                zipStream.Close();
            }
        }
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
        {
            isf.CreateDirectory(@"root");
            isf.CreateDirectory(@"root\subfolder1");
            isf.CreateDirectory(@"root\subfolder2");

            using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(@"root\file0.txt", System.IO.FileMode.Create, isf))
            {
                byte[] bytes = Encoding.Unicode.GetBytes("hello");
                stream.Write(bytes, 0, bytes.Length);
            }

            using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(@"root\subfolder1\file1.txt", System.IO.FileMode.Create, isf))
            {
                byte[] bytes = Encoding.Unicode.GetBytes("zip");
                stream.Write(bytes, 0, bytes.Length);
            }

            using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(@"root\subfolder2\file2.txt", System.IO.FileMode.Create, isf))
            {
                byte[] bytes = Encoding.Unicode.GetBytes("world");
                stream.Write(bytes, 0, bytes.Length);
            }

        }
        CreateZip("root.zip", null, "root");
    }