using System; using System.IO; using System.IO.Compression; namespace Skyiv.Helper { static class Zip { public static void CompressFile(string sourceFile, string destinationFile) { if (!File.Exists(sourceFile)) throw new FileNotFoundException(); using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read)) { byte [] buffer = new byte[sourceStream.Length]; int checkCounter = sourceStream.Read(buffer, 0, buffer.Length); if (checkCounter != buffer.Length) throw new ApplicationException(); using (FileStream destinationStream = new FileStream(destinationFile, FileMode.OpenOrCreate, FileAccess.Write)) { using (GZipStream compressedStream = new GZipStream(destinationStream, CompressionMode.Compress, true)) { compressedStream.Write(buffer, 0, buffer.Length); } } } } public static void DecompressFile(string sourceFile, string destinationFile) { if (!File.Exists( sourceFile)) throw new FileNotFoundException(); using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open)) { byte [] quartetBuffer = new byte[4]; int position = (int)sourceStream.Length - 4; sourceStream.Position = position; sourceStream.Read(quartetBuffer, 0, 4); sourceStream.Position = 0; int checkLength = BitConverter.ToInt32(quartetBuffer, 0); byte[] buffer = new byte[checkLength + 100]; using (GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Decompress, true)) { int total = 0; for (int offset = 0; ; ) { int bytesRead = decompressedStream.Read(buffer, offset, 100); if (bytesRead == 0) break; offset += bytesRead; total += bytesRead; } using (FileStream destinationStream = new FileStream(destinationFile, FileMode.Create)) { destinationStream.Write(buffer, 0, total); destinationStream.Flush(); } } } } } } using System; using System.IO; using Skyiv.Helper; namespace Skyiv.Test { sealed class TestMain { static void Main() { try { string [] nameList = {"zip.zip", "zip.cs", "zip.txt"}; Zip.CompressFile(nameList[1], nameList[0]); Zip.DecompressFile(nameList[0], nameList[2]); foreach (string name in nameList) { Console.WriteLine("{0,-11}: {1,11:N0} bytes", name, new FileInfo(name).Length); } } catch (Exception ex) { Console.WriteLine(ex.Message); } } } } 運行結果如下: zip.zip : 773 bytes zip.cs : 2,196 bytes zip.txt : 2,196 bytes 但是,如果有使用Zip.DecompressFile()方法去解壓標準的ZIP檔案,就會出現以下錯誤: GZip 頭中的幻數不正確。請確保正在傳入 GZip 流。 此外,使用Zip.CompressFile()方法也不能將多個檔案放入一個ZIP包。 看來,FCL2.0還是不能處理標準的ZIP檔案,我目前是使用第三方的ICSharpZipLib來處理ZIP檔案: http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx |