/// <summary>
/// Download a single file or directory.
/// </summary>
void DownloadDirectoryOrFile(FTPFileSystem fileSystem, string localPath)
{
// Download the file directly.
if (!fileSystem.IsDirectory)
{
DownloadFile(fileSystem, localPath);
}
// Download a directory.
else
{
// Construct the directory Path.
string directoryPath = localPath + "\\" + fileSystem.Name;
if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}
// Get the sub directories and files.
var subDirectoriesAndFiles =
this.manager.GetSubDirectoriesAndFiles(fileSystem.Url);
// Download the files in the folder and sub directories.
foreach (var subFile in subDirectoriesAndFiles)
{
DownloadDirectoryOrFile(subFile, directoryPath);
}
}
}
/// <summary>
/// 下载一个单一的文件和目录.
/// </summary>
void DownloadDirectoryOrFile(FTPFileSystem fileSystem, string localPath)
{
// 下载文件目录.
if (!fileSystem.IsDirectory)
{
DownloadFile(fileSystem, localPath);
}
// 下载一个目录.
else
{
//目录路径的结构.
string directoryPath = localPath + "\\" + fileSystem.Name;
if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}
//获得子目录和文件.
var subDirectoriesAndFiles =
this.manager.GetSubDirectoriesAndFiles(fileSystem.Url);
// 下载文件夹的文件和子目录.
foreach (var subFile in subDirectoriesAndFiles)
{
DownloadDirectoryOrFile(subFile, directoryPath);
}
}
}
/// <summary>
/// Get the sub directories and files of the Url. It will be used in enumerate
/// all the folders.
/// When run the FTP LIST protocol method to get a detailed listing of the files
/// on an FTP server, the server will response many records of information. Each
/// record represents a file.
/// </summary>
public IEnumerable <FTPFileSystem> GetSubDirectoriesAndFiles(Uri url)
{
FtpWebRequest request = WebRequest.Create(url) as FtpWebRequest;
request.Credentials = this.Credentials;
request.UseBinary = true;
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
FtpWebResponse response = null;
Stream responseStream = null;
StreamReader reader = null;
try
{
response = request.GetResponse() as FtpWebResponse;
this.OnNewMessageArrived(new NewMessageEventArg
{
NewMessage = response.StatusDescription
});
responseStream = response.GetResponseStream();
// reader = new StreamReader(responseStream);
reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);
List <FTPFileSystem> subDirs = new List <FTPFileSystem>();
string subDir = reader.ReadLine();
// Find out the FTP Directory Listing Style from the recordString.
FTPDirectoryListingStyle style = FTPDirectoryListingStyle.MSDOS;
if (!string.IsNullOrEmpty(subDir))
{
style = FTPFileSystem.GetDirectoryListingStyle(subDir);
}
while (!string.IsNullOrEmpty(subDir))
{
subDirs.Add(FTPFileSystem.ParseRecordString(url, subDir, style));
subDir = reader.ReadLine();
}
return(subDirs);
}
finally
{
if (response != null)
{
response.Close();
}
// Close the StreamReader object and the underlying stream, and release
// any system resources associated with the reader.
if (reader != null)
{
reader.Close();
}
}
}
/// <summary>
/// 获得Url的子目录和文件. 对于所有的文件夹他将使用枚举.
/// 在一个FTP 服务上，当运行FTP LIST 协议方法来获得一个文件的详细列表时，
/// 这个服务将响应一些信息的记录。每一个记录代表一个文件。
/// </summary>
public IEnumerable <FTPFileSystem> GetSubDirectoriesAndFiles(Uri url)
{
FtpWebRequest request = WebRequest.Create(url) as FtpWebRequest;
request.Credentials = this.Credentials;
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
FtpWebResponse response = null;
Stream responseStream = null;
StreamReader reader = null;
try
{
response = request.GetResponse() as FtpWebResponse;
this.OnNewMessageArrived(new NewMessageEventArg
{
NewMessage = response.StatusDescription
});
responseStream = response.GetResponseStream();
reader = new StreamReader(responseStream);
List <FTPFileSystem> subDirs = new List <FTPFileSystem>();
string subDir = reader.ReadLine();
//在记录的字符串中找到FTP目录列表类型.
FTPDirectoryListingStyle style = FTPDirectoryListingStyle.MSDOS;
if (!string.IsNullOrEmpty(subDir))
{
style = FTPFileSystem.GetDirectoryListingStyle(subDir);
}
while (!string.IsNullOrEmpty(subDir))
{
subDirs.Add(FTPFileSystem.ParseRecordString(url, subDir, style));
subDir = reader.ReadLine();
}
return(subDirs);
}
finally
{
if (response != null)
{
response.Close();
}
// 关闭StreamReader对象和底层流,并且释放与reader有关的任何资源。
if (reader != null)
{
reader.Close();
}
}
}
/// <summary>
/// Get an FTPFileSystem from the recordString.
/// </summary>
public static FTPFileSystem ParseRecordString(Uri baseUrl, string recordString, FTPDirectoryListingStyle type)
{
FTPFileSystem fileSystem = null;
if (type == FTPDirectoryListingStyle.UNIX)
{
fileSystem = ParseUNIXRecordString(recordString);
}
else
{
fileSystem = ParseMSDOSRecordString(recordString);
}
// Add "/" to the url if it is a directory
fileSystem.Url = new Uri(baseUrl, fileSystem.Name + (fileSystem.IsDirectory ? "/" : string.Empty));
return(fileSystem);
}
/// <summary>
/// 12-13-10 12:41PM <DIR> Folder A
/// </summary>
/// <param name="recordString"></param>
/// <returns></returns>
static FTPFileSystem ParseMSDOSRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.MSDOS;
// 这个部分如 "12-13-10", "", "12:41PM", "", "","", "",
// "", "", "<DIR>", "", "", "", "", "", "", "", "", "", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
//这个数据部分如 "12-13-10" instead of "12-13-2010" 如果年是
//四位数就不在ISS中查找
string dateSegment = segments[index];
string[] dateSegments = dateSegment.Split(new char[] { '-' },
StringSplitOptions.RemoveEmptyEntries);
int month = int.Parse(dateSegments[0]);
int day = int.Parse(dateSegments[1]);
int year = int.Parse(dateSegments[2]);
//如果year大于等于50并且小雨100，将意味着这个年时19**
if (year >= 50 && year < 100)
{
year += 1900;
}
//如果year小于50，它意味着年时20**
else if (year < 50)
{
year += 2000;
}
//跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 时间部分.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0}-{1}-{2} {3}",
year, month, day, timesegment));
// 跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 这个部分的大小和目录 .
//如果这部分是 "<DIR>", 它意味着是一个目录,否则它是一个文件的大小。
string sizeOrDirSegment = segments[index];
fileSystem.IsDirectory = sizeOrDirSegment.Equals("<DIR>",
StringComparison.OrdinalIgnoreCase);
//如果这个文件流是一个文件,这个大小是大于0的.
if (!fileSystem.IsDirectory)
{
fileSystem.Size = int.Parse(sizeOrDirSegment);
}
// 掉过空的部分.
while (segments[++index] == string.Empty)
{
}
// 在原始字符串中计算文件名索引的部分.
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// 在原始字符串中的"" 表示' '.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
//这个名可能包含一些空字符.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return(fileSystem);
}
/// <summary>
/// 这个recordString是像：
/// 目录: drwxrwxrwx 1 owner group 0 Dec 13 11:25 Folder A
/// 文件: -rwxrwxrwx 1 owner group 1024 Dec 13 11:25 File B
/// 注意: 这个日期设置不能包括年.
/// </summary>
static FTPFileSystem ParseUNIXRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.UNIX;
// 这个设置如 "drwxrwxrwx", "", "", "1", "owner", "", "", "",
// "group", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
// "0", "Dec", "13", "11:25", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
//这个权限设置如： "drwxrwxrwx".
string permissionsegment = segments[index];
// 如果这个属性第一个字母是 'd', 它意味着是一个目录.
fileSystem.IsDirectory = permissionsegment[0] == 'd';
// 跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 跳过部分的目录.
// 跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 跳过这组的部分.
//跳过空的部分 .
while (segments[++index] == string.Empty)
{
}
//跳过组的这部分.
//跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 如果这个文件流是一个文件, 它的大小大于0.
fileSystem.Size = int.Parse(segments[index]);
// 跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 月的部分.
string monthsegment = segments[index];
// 跳过空的部分.
while (segments[++index] == string.Empty)
{
}
// 日期部分.
string daysegment = segments[index];
// 跳过这个空的部分.
while (segments[++index] == string.Empty)
{
}
// 时间部分.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0} {1} {2} ",
timesegment, monthsegment, daysegment));
// 跳过空的部分
while (segments[++index] == string.Empty)
{
}
//在原始字符串中计算文件名索引的部分
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// 在原始字符串中的"" 表示' '.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
// 这个名可能包含一些空字符.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return(fileSystem);
}
/// <summary>
/// 这个recordString是像：
/// 目录: drwxrwxrwx 1 owner group 0 Dec 13 11:25 Folder A
/// 文件: -rwxrwxrwx 1 owner group 1024 Dec 13 11:25 File B
/// 注意: 这个日期设置不能包括年.
/// </summary>
static FTPFileSystem ParseUNIXRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.UNIX;
// 这个设置如 "drwxrwxrwx", "", "", "1", "owner", "", "", "",
// "group", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
// "0", "Dec", "13", "11:25", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
//这个权限设置如： "drwxrwxrwx".
string permissionsegment = segments[index];
// 如果这个属性第一个字母是 'd', 它意味着是一个目录.
fileSystem.IsDirectory = permissionsegment[0] == 'd';
// 跳过空的部分.
while (segments[++index] == string.Empty) { }
// 跳过部分的目录.
// 跳过空的部分.
while (segments[++index] == string.Empty) { }
// 跳过这组的部分.
//跳过空的部分 .
while (segments[++index] == string.Empty) { }
//跳过组的这部分.
//跳过空的部分.
while (segments[++index] == string.Empty) { }
// 如果这个文件流是一个文件, 它的大小大于0.
fileSystem.Size = int.Parse(segments[index]);
// 跳过空的部分.
while (segments[++index] == string.Empty) { }
// 月的部分.
string monthsegment = segments[index];
// 跳过空的部分.
while (segments[++index] == string.Empty) { }
// 日期部分.
string daysegment = segments[index];
// 跳过这个空的部分.
while (segments[++index] == string.Empty) { }
// 时间部分.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0} {1} {2} ",
timesegment, monthsegment, daysegment));
// 跳过空的部分
while (segments[++index] == string.Empty) { }
//在原始字符串中计算文件名索引的部分
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// 在原始字符串中的"" 表示' '.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
// 这个名可能包含一些空字符.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return fileSystem;
}
/// <summary>
/// 12-13-10 12:41PM <DIR> Folder A
/// </summary>
/// <param name="recordString"></param>
/// <returns></returns>
static FTPFileSystem ParseMSDOSRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.MSDOS;
// 这个部分如 "12-13-10", "", "12:41PM", "", "","", "",
// "", "", "<DIR>", "", "", "", "", "", "", "", "", "", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
//这个数据部分如 "12-13-10" instead of "12-13-2010" 如果年是
//四位数就不在ISS中查找
string dateSegment = segments[index];
string[] dateSegments = dateSegment.Split(new char[] { '-' },
StringSplitOptions.RemoveEmptyEntries);
int month = int.Parse(dateSegments[0]);
int day = int.Parse(dateSegments[1]);
int year = int.Parse(dateSegments[2]);
//如果year大于等于50并且小雨100，将意味着这个年时19**
if (year >= 50 && year < 100)
{
year += 1900;
}
//如果year小于50，它意味着年时20**
else if (year < 50)
{
year += 2000;
}
//跳过空的部分.
while (segments[++index] == string.Empty) { }
// 时间部分.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0}-{1}-{2} {3}",
year, month, day, timesegment));
// 跳过空的部分.
while (segments[++index] == string.Empty) { }
// 这个部分的大小和目录 .
//如果这部分是 "<DIR>", 它意味着是一个目录,否则它是一个文件的大小。
string sizeOrDirSegment = segments[index];
fileSystem.IsDirectory = sizeOrDirSegment.Equals("<DIR>",
StringComparison.OrdinalIgnoreCase);
//如果这个文件流是一个文件,这个大小是大于0的.
if (!fileSystem.IsDirectory)
{
fileSystem.Size = int.Parse(sizeOrDirSegment);
}
// 掉过空的部分.
while (segments[++index] == string.Empty) { }
// 在原始字符串中计算文件名索引的部分.
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// 在原始字符串中的"" 表示' '.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
//这个名可能包含一些空字符.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return fileSystem;
}
/// <summary>
/// 12-13-10 12:41PM <DIR> Folder A
/// </summary>
/// <param name="recordString"></param>
/// <returns></returns>
static FTPFileSystem ParseMSDOSRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.MSDOS;
// The segments is like "12-13-10", "", "12:41PM", "", "","", "",
// "", "", "<DIR>", "", "", "", "", "", "", "", "", "", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
// The date segment is like "12-13-10" instead of "12-13-2010" if Four-digit years
// is not checked in IIS.
string dateSegment = segments[index];
string[] dateSegments = dateSegment.Split(new char[] { '-' },
StringSplitOptions.RemoveEmptyEntries);
int month = int.Parse(dateSegments[0]);
int day = int.Parse(dateSegments[1]);
int year = int.Parse(dateSegments[2]);
// If year >=50 and year <100, then it means the year 19**
if (year >= 50 && year < 100)
{
year += 1900;
}
// If year <50, then it means the year 20**
else if (year < 50)
{
year += 2000;
}
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// The time segment.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0}-{1}-{2} {3}",
year, month, day, timesegment));
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// The size or directory segment.
// If this segment is "<DIR>", then it means a directory, else it means the
// file size.
string sizeOrDirSegment = segments[index];
fileSystem.IsDirectory = sizeOrDirSegment.Equals("<DIR>",
StringComparison.OrdinalIgnoreCase);
// If this fileSystem is a file, then the size is larger than 0.
if (!fileSystem.IsDirectory)
{
fileSystem.Size = int.Parse(sizeOrDirSegment);
}
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// Calculate the index of the file name part in the original string.
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// "" represents ' ' in the original string.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
// The file name may include many segments because the name can contain ' '.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return(fileSystem);
}
/// <summary>
/// The recordString is like
/// Directory: drwxrwxrwx 1 owner group 0 Dec 13 11:25 Folder A
/// File: -rwxrwxrwx 1 owner group 1024 Dec 13 11:25 File B
/// NOTE: The date segment does not contains year.
/// </summary>
static FTPFileSystem ParseUNIXRecordString(string recordString)
{
FTPFileSystem fileSystem = new FTPFileSystem();
fileSystem.OriginalRecordString = recordString.Trim();
fileSystem.DirectoryListingStyle = FTPDirectoryListingStyle.UNIX;
// The segments is like "drwxrwxrwx", "", "", "1", "owner", "", "", "",
// "group", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
// "0", "Dec", "13", "11:25", "Folder", "A".
string[] segments = fileSystem.OriginalRecordString.Split(' ');
int index = 0;
// The permission segment is like "drwxrwxrwx".
string permissionsegment = segments[index];
// If the property start with 'd', then it means a directory.
fileSystem.IsDirectory = permissionsegment[0] == 'd';
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// Skip the directories segment.
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// Skip the owner segment.
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// Skip the group segment.
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// If this fileSystem is a file, then the size is larger than 0.
fileSystem.Size = int.Parse(segments[index]);
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// The month segment.
string monthsegment = segments[index];
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// The day segment.
string daysegment = segments[index];
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// The time segment.
string timesegment = segments[index];
fileSystem.ModifiedTime = DateTime.Parse(string.Format("{0} {1} {2} ",
timesegment, monthsegment, daysegment));
// Skip the empty segments.
while (segments[++index] == string.Empty)
{
}
// Calculate the index of the file name part in the original string.
int filenameIndex = 0;
for (int i = 0; i < index; i++)
{
// "" represents ' ' in the original string.
if (segments[i] == string.Empty)
{
filenameIndex += 1;
}
else
{
filenameIndex += segments[i].Length + 1;
}
}
// The file name may include many segments because the name can contain ' '.
fileSystem.Name = fileSystem.OriginalRecordString.Substring(filenameIndex).Trim();
return(fileSystem);
}
/// <summary>
/// 下载一个单一的文件目录.
/// </summary>
void DownloadFile(FTPFileSystem file, string localPath)
{
if (file.IsDirectory)
{
throw new ArgumentException(
"The FTPFileSystem to download is a directory in fact");
}
string destPath = localPath + "\\" + file.Name;
//创建一个要下载的文件的请求.
FtpWebRequest request = WebRequest.Create(file.Url) as FtpWebRequest;
request.Credentials = this.manager.Credentials;
// 下载文件.
request.Method = WebRequestMethods.Ftp.DownloadFile;
FtpWebResponse response = null;
Stream responseStream = null;
MemoryStream downloadCache = null;
try
{
//检索来自服务器的响应，并得到响应流.
response = request.GetResponse() as FtpWebResponse;
this.manager.OnNewMessageArrived(new NewMessageEventArg
{
NewMessage = response.StatusDescription
});
responseStream = response.GetResponseStream();
//内存中的缓存数据.
downloadCache = new MemoryStream(FTPDownloadClient.MaxCacheSize);
byte[] downloadBuffer = new byte[FTPDownloadClient.BufferSize];
int bytesSize = 0;
int cachedSize = 0;
// 下载这个文件直到下载完成.
while (true)
{
//从流中读取数据的缓冲区。
bytesSize = responseStream.Read(downloadBuffer, 0,
downloadBuffer.Length);
//如果这个缓存区是空的，或者下载完成，把在缓存中的数据写到本地文件中。
if (bytesSize == 0
|| MaxCacheSize < cachedSize + bytesSize)
{
try
{
// 把在缓存中的数据写到本地文件中.
WriteCacheToFile(downloadCache, destPath, cachedSize);
//如果被暂停下载将停止正在下载的文件，取消或者完成.
if (bytesSize == 0)
{
break;
}
// 重置缓存.
downloadCache.Seek(0, SeekOrigin.Begin);
cachedSize = 0;
}
catch (Exception ex)
{
string msg = string.Format(
"There is an error while downloading {0}. "
+ " See InnerException for detailed error. ",
file.Url);
ApplicationException errorException
= new ApplicationException(msg, ex);
//这个错误给了DownloadCompleted事件
ErrorEventArgs e = new ErrorEventArgs
{
ErrorException = errorException
};
this.manager.OnErrorOccurred(e);
return;
}
}
//把缓冲区的数据写到内存中的缓存。
downloadCache.Write(downloadBuffer, 0, bytesSize);
cachedSize += bytesSize;
}
var fileDownloadCompletedEventArgs = new FileDownloadCompletedEventArgs
{
LocalFile = new FileInfo(destPath),
ServerPath = file.Url
};
this.OnFileDownloadCompleted(fileDownloadCompletedEventArgs);
}
finally
{
if (response != null)
{
response.Close();
}
if (responseStream != null)
{
responseStream.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
}
}
/// <summary>
/// 下载一个单一的文件和目录.
/// </summary>
void DownloadDirectoryOrFile(FTPFileSystem fileSystem, string localPath)
{
// 下载文件目录.
if (!fileSystem.IsDirectory)
{
DownloadFile(fileSystem, localPath);
}
// 下载一个目录.
else
{
//目录路径的结构.
string directoryPath = localPath + "\\" + fileSystem.Name;
if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}
//获得子目录和文件.
var subDirectoriesAndFiles =
this.manager.GetSubDirectoriesAndFiles(fileSystem.Url);
// 下载文件夹的文件和子目录.
foreach (var subFile in subDirectoriesAndFiles)
{
DownloadDirectoryOrFile(subFile, directoryPath);
}
}
}
/// <summary>
/// Download a single file directly.
/// </summary>
void DownloadFile(FTPFileSystem file, string localPath)
{
if (file.IsDirectory)
{
throw new ArgumentException(
"The FTPFileSystem to download is a directory in fact");
}
string destPath = localPath + "\\" + file.Name;
// Create a request to the file to be downloaded.
FtpWebRequest request = WebRequest.Create(file.Url) as FtpWebRequest;
request.Credentials = this.manager.Credentials;
// Download file.
request.Method = WebRequestMethods.Ftp.DownloadFile;
FtpWebResponse response = null;
Stream responseStream = null;
MemoryStream downloadCache = null;
try
{
// Retrieve the response from the server and get the response stream.
response = request.GetResponse() as FtpWebResponse;
this.manager.OnNewMessageArrived(new NewMessageEventArg
{
NewMessage = response.StatusDescription
});
responseStream = response.GetResponseStream();
// Cache data in memory.
downloadCache = new MemoryStream(FTPDownloadClient.MaxCacheSize);
byte[] downloadBuffer = new byte[FTPDownloadClient.BufferSize];
int bytesSize = 0;
int cachedSize = 0;
// Download the file until the download is completed.
while (true)
{
// Read a buffer of data from the stream.
bytesSize = responseStream.Read(downloadBuffer, 0,
downloadBuffer.Length);
// If the cache is full, or the download is completed, write
// the data in cache to local file.
if (bytesSize == 0 ||
MaxCacheSize < cachedSize + bytesSize)
{
try
{
// Write the data in cache to local file.
WriteCacheToFile(downloadCache, destPath, cachedSize);
// Stop downloading the file if the download is paused,
// canceled or completed.
if (bytesSize == 0)
{
break;
}
// Reset cache.
downloadCache.Seek(0, SeekOrigin.Begin);
cachedSize = 0;
}
catch (Exception ex)
{
string msg = string.Format(
"There is an error while downloading {0}. "
+ " See InnerException for detailed error. ",
file.Url);
ApplicationException errorException
= new ApplicationException(msg, ex);
// Fire the DownloadCompleted event with the error.
ErrorEventArgs e = new ErrorEventArgs
{
ErrorException = errorException
};
this.manager.OnErrorOccurred(e);
return;
}
}
// Write the data from the buffer to the cache in memory.
downloadCache.Write(downloadBuffer, 0, bytesSize);
cachedSize += bytesSize;
}
var fileDownloadCompletedEventArgs = new FileDownloadCompletedEventArgs
{
LocalFile = new FileInfo(destPath),
ServerPath = file.Url
};
this.OnFileDownloadCompleted(fileDownloadCompletedEventArgs);
}
finally
{
if (response != null)
{
response.Close();
}
if (responseStream != null)
{
responseStream.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
}
}
/// <summary>
/// 下载一个单一的文件目录.
/// </summary>
void DownloadFile(FTPFileSystem file, string localPath)
{
if (file.IsDirectory)
{
throw new ArgumentException(
"The FTPFileSystem to download is a directory in fact");
}
string destPath = localPath + "\\" + file.Name;
//创建一个要下载的文件的请求.
FtpWebRequest request = WebRequest.Create(file.Url) as FtpWebRequest;
request.Credentials = this.manager.Credentials;
// 下载文件.
request.Method = WebRequestMethods.Ftp.DownloadFile;
FtpWebResponse response = null;
Stream responseStream = null;
MemoryStream downloadCache = null;
try
{
//检索来自服务器的响应，并得到响应流.
response = request.GetResponse() as FtpWebResponse;
this.manager.OnNewMessageArrived(new NewMessageEventArg
{
NewMessage = response.StatusDescription
});
responseStream = response.GetResponseStream();
//内存中的缓存数据.
downloadCache = new MemoryStream(FTPDownloadClient.MaxCacheSize);
byte[] downloadBuffer = new byte[FTPDownloadClient.BufferSize];
int bytesSize = 0;
int cachedSize = 0;
// 下载这个文件直到下载完成.
while (true)
{
//从流中读取数据的缓冲区。
bytesSize = responseStream.Read(downloadBuffer, 0,
downloadBuffer.Length);
//如果这个缓存区是空的，或者下载完成，把在缓存中的数据写到本地文件中。
if (bytesSize == 0 ||
MaxCacheSize < cachedSize + bytesSize)
{
try
{
// 把在缓存中的数据写到本地文件中.
WriteCacheToFile(downloadCache, destPath, cachedSize);
//如果被暂停下载将停止正在下载的文件，取消或者完成.
if (bytesSize == 0)
{
break;
}
// 重置缓存.
downloadCache.Seek(0, SeekOrigin.Begin);
cachedSize = 0;
}
catch (Exception ex)
{
string msg = string.Format(
"There is an error while downloading {0}. "
+ " See InnerException for detailed error. ",
file.Url);
ApplicationException errorException
= new ApplicationException(msg, ex);
//这个错误给了DownloadCompleted事件
ErrorEventArgs e = new ErrorEventArgs
{
ErrorException = errorException
};
this.manager.OnErrorOccurred(e);
return;
}
}
//把缓冲区的数据写到内存中的缓存。
downloadCache.Write(downloadBuffer, 0, bytesSize);
cachedSize += bytesSize;
}
var fileDownloadCompletedEventArgs = new FileDownloadCompletedEventArgs
{
LocalFile = new FileInfo(destPath),
ServerPath = file.Url
};
this.OnFileDownloadCompleted(fileDownloadCompletedEventArgs);
}
finally
{
if (response != null)
{
response.Close();
}
if (responseStream != null)
{
responseStream.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
}
}
