Dropbox からフォルダー全体を自動的にダウンロードしています - ストレージ (?)、ウェブリンク経由で、例:https://www.dropbox.com/sh/bunchOfLetters/somthnsomthn?dl=1基本的なウェブクライアントのみ:
using (WebClient wc = new WebClient())
{
wc.DownloadFile(new Uri(uri), _basePath + localPath);
}
フォルダーは当然 .rar ファイルとして提供されます (Dropbox のダウンロード システムのため)。ファイルを手動で (Winrar 経由で) 開こうとしても、まったく問題はありません。ここで問題が発生します....自動化されたライブラリ（unrarやSharpCompressなど）を使用しようとすると、ダウンロードがすべてを取得できなかったか、ファイルが破損したかのように、常に「破損したヘッダー」が表示されます..しかし、それでもWinrar で開くと問題なく動作します。
誰かがその方法と理由を知っている場合; あなたの考えを聞くことができれば幸いです。
編集：
これが私がSharpCompressに使用する関数です:
public static bool ExtractToFolder(string extractionPackage, string outputPath)
{
if (extractionPackage == null) throw new ArgumentNullException(nameof(extractionPackage));
if (outputPath == null) throw new ArgumentNullException(nameof(outputPath));
if (string.IsNullOrEmpty(extractionPackage))
throw new ArgumentException("Argument is null or empty", nameof(extractionPackage));
if (string.IsNullOrEmpty(outputPath))
throw new ArgumentException("Argument is null or empty", nameof(outputPath));
if (!extractionPackage.EndsWith(".rar")) throw new InvalidDataException("not a .rar File");
Directory.CreateDirectory(outputPath);
try
{
using (Stream stream = File.OpenRead(extractionPackage))
using (RarReader reader = RarReader.Open(stream))
{
while (reader.MoveToNextEntry())
{
reader.WriteEntryToDirectory(outputPath, ExtractOptions.ExtractFullPath | ExtractOptions.Overwrite);
}
}
return true;
}
catch
{
return false;
}
}
誰かがunrarファイルに興味を持っている場合:..よくできていないことは知っていますが、通常のファイルでは機能します...Dropboxのファイルでは機能しません
namespace Cryptus.Rar
{
/// <summary>
/// just for compatibility purposes, use <see cref="SharpCompress"/>
/// </summary>
public class Unrar
{
public enum RarOperations
{
OP_EXTRACT = 0,
OP_TEST = 1,
OP_LIST = 2
}
public const int ERAR_END_ARCHIVE = 10;
public const int ERAR_NO_MEMORY = 11;
public const int ERAR_BAD_DATA = 12;
public const int ERAR_BAD_ARCHIVE = 13;
public const int ERAR_UNKNOWN_FORMAT = 14;
public const int ERAR_EOPEN = 15;
public const int ERAR_ECREATE = 16;
public const int ERAR_ECLOSE = 17;
public const int ERAR_EREAD = 18;
public const int ERAR_EWRITE = 19;
public const int ERAR_SMALL_BUF = 20;
public const int RAR_OM_LIST = 0;
public const int RAR_OM_EXTRACT = 1;
public const int RAR_SKIP = 0;
public const int RAR_TEST = 1;
public const int RAR_EXTRACT = 2;
public const int RAR_VOL_ASK = 0;
public const int RAR_VOL_NOTIFY = 1;
[DllImport("unrar.dll")]
public static extern IntPtr RAROpenArchive(ref RAROpenArchiveData ArchiveData);
[DllImport("unrar.dll")]
public static extern int RARCloseArchive(IntPtr hArcData);
[DllImport("unrar.dll")]
public static extern int RARReadHeader(IntPtr hArcData, ref RARHeaderData HeaderData);
[DllImport("unrar.dll")]
public static extern IntPtr RAROpenArchiveEx(ref RAROpenArchiveDataEx ArchiveData);
[DllImport("unrar.dll")]
public static extern int RARReadHeaderEx(IntPtr hArcData, ref RARHeaderDataEx HeaderData);
[DllImport("unrar.dll")]
public static extern int RARProcessFile(IntPtr hArcData, int Operation, string DestPath, string DestName);
[DllImport("unrar.dll")]
public static extern int RARGetDllVersion();
[DllImport("user32.dll")]
private static extern bool CharToOem(string lpszSrc, [Out] StringBuilder lpszDst);
/// <summary>
/// opens an arcive and unloads its content to destDolder
/// </summary>
/// <param name="strFileName">input .rar File</param>
/// <param name="destFolder">destination Folder</param>
public void UnloadArchieve(string strFileName, string destFolder)
{
IntPtr lHandle;
int iStatus;
RAROpenArchiveData uRAR = new RAROpenArchiveData();
RARHeaderData uHeader = new RARHeaderData();
uRAR.ArcName = strFileName + char.MinValue;
uRAR.OpenMode = RAR_OM_EXTRACT;
uRAR.CmtBuf = null;
string ExtractDir = Path.GetDirectoryName(strFileName);
StringBuilder sbDir = new StringBuilder();
CharToOem(destFolder, sbDir);
lHandle = RAROpenArchive(ref uRAR);
if (uRAR.OpenResult != 0)
Console.Write("Unable to open the Archieve!!!");
while (RARReadHeader(lHandle, ref uHeader) == 0)
{
int result = RARProcessFile(lHandle, 2, sbDir.ToString(), null);
if (0 != result)
Console.Write("Unable to open the Archieve!!!");
}
iStatus = RARCloseArchive(lHandle);
}
[StructLayout(LayoutKind.Sequential)]
public struct RARHeaderData
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string ArcName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string FileName;
public uint Flags;
public uint PackSize;
public uint UnpSize;
public uint HostOS;
public uint FileCRC;
public uint FileTime;
public uint UnpVer;
public uint Method;
public uint FileAttr;
public string CmtBuf;
public uint CmtBufSize;
public uint CmtSize;
public uint CmtState;
}
[StructLayout(LayoutKind.Sequential)]
public struct RAROpenArchiveData
{
public string ArcName;
public uint OpenMode;
public uint OpenResult;
public string CmtBuf;
public uint CmtBufSize;
public uint CmtSize;
public uint CmtState;
}
[StructLayout(LayoutKind.Sequential)]
public struct RAROpenArchiveDataEx
{
public string ArcName;
public string ArcNameW;
public uint OpenMode;
public uint OpenResult;
public string CmtBuf;
public uint CmtBufSize;
public uint CmtSize;
public uint CmtState;
public uint Flags;
public uint Reserved;
}
[StructLayout(LayoutKind.Sequential)]
public struct RARHeaderDataEx
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string ArcName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string FileName;
public string FileNameW;
public uint Flags;
public uint PackSize;
public uint PackSizeHigh;
public uint UnpSize;
public uint UnpSizeHigh;
public uint HostOS;
public uint FileCRC;
public uint FileTime;
public uint UnpVer;
public uint Method;
public uint FileAttr;
public string CmtBuf;
public uint CmtBufSize;
public uint CmtSize;
public uint CmtState;
public uint Reserved;
}
}