Silverlight 的解压缩之Zip in Zip

.Net下的经典的SharpZipLib已经发布Silverlight4版本，可以到Codeplex下载。

如何创建在Zip中在创建Zip内，这个需求非常好，因为Silverlight现在还没有类似Select Folder Dialog。

1. 定义SaveFileDialog …

说废话，遭人骂

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2. 获取File stream 并传递给 ZipOutputStream (zip的流)，创建rootZipStream

             if (SaveFileDialog.ShowDialog().Value)

            {

                System.IO.Stream fileStream = SaveFileDialog .OpenFile();

                ZipOutputStream rootZipStream = new ZipOutputStream(fileStream);

                rootZipStream .SetLevel(6);   // 常规的压缩比

                rootZipStream .IsStreamOwner = true;

                …..

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3. 定义ZipEntry (相当于里面的Zip里面的一个文件)，构造函数就是文件名，其实就是定义一个FileInfo。将你的数据转换为bytes。（网上方法超多）

                    bytes[] buffer = …

                    ZipEntry jpgEntry = new ZipEntry(FileName)

                    {

                        DateTime = DateTime.Now,

                        Size = buffer.Length

                    };

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4. 定义内部的ZipOutputStream，同上，不过要传入一个空的MemoryStream。

                    MemoryStream innerZipStream = new MemoryStream();

                    ZipOutputStream innerZip = new ZipOutputStream(innerZipStream);

                    innerZip.SetLevel(6);

                    innerZip.IsStreamOwner = true;

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5. 将你的byte[]们对应的ZipEntry 们 交给innerZipStream

                    innerZip.PutNextEntry(docEntry);

                    innerZip.Write(docBuffer, 0, docBuffer.Length);

 

                    innerZip.PutNextEntry(jpgEntry);

                    innerZip.Write(jpgBuffer, 0, jpgBuffer.Length); // 有几个传几个

                    innerZip.Finish(); // 这个别忘记，否则就出现 “压缩末端不可预料”什么玩意，呵呵

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6. 为innerZipStream创建ZipEntry，交给rootZipStream。最后Finish and Close

                    ZipEntry innerZipEntry = new ZipEntry(string.Format("{0}.zip", yourInnerZipName))
                    {
                        DateTime = DateTime.Now,
                        Size = innerZip.Length
                    };

                    rootZip.PutNextEntry(innerZipEntry);

                    rootZip.Write(
                        this.StreamToBuffer(innerZipStream),
                        0,
                        (int)innerZipStream.Length);

                    innerZipStream.Close();

 

                    rootZipStream.Finish();
                    rootZipStream.Close();

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总之，原理很简单，很多细节要注意，呵呵。 转载注明出处哦 O(∩_∩)O~