/// <summary>
/// 下载文件（可断点续传）
/// </summary>
/// <param name="ftpAddress">服务器地址，格式为 userName:Password@hostName:port(ftp://softer:[email protected]:21)</param>
/// <param name="remoteFilename"></param>
/// <param name="localFilename"></param>
/// <param name="resumeOperation"></param>
public bool DownloadFile(string ftpAddress, string remoteFilename, string localFilename, bool resumeOperation)
{
FtpSiteData siteData = ParseFtpAddress(ftpAddress);
if (siteData == null)
{
throw new ArgumentException("Invalid ftp address format!");
}
using (FtpConnection connection = new FtpConnection(siteData.Host, siteData.Port, siteData.UserName, siteData.Password))
{
SetConnection(connection);
AbstractFolder remoteFolder = new FtpFolder(connection);
AbstractFile remoteFile = remoteFolder.GetFile(remoteFilename);
// 不行，必须要从Folder来
//AbstractFile remoteFile = new FtpFile(connection, remoteFilename);
AbstractFile localFile = new DiskFile(localFilename);
if (!resumeOperation || !localFile.Exists || remoteFile.Size < localFile.Size)
{
remoteFile.CopyTo(localFile, true);
}
else if (remoteFile.Size == localFile.Size)
{
return(true);
}
else if (remoteFile.Size > localFile.Size)
{
byte[] buf = new byte[1024];
int cnt = -1;
using (System.IO.Stream localStream = localFile.OpenWrite(false))
{
using (System.IO.Stream remoteStream = remoteFile.OpenRead())
{
remoteStream.Seek(localFile.Size, System.IO.SeekOrigin.Begin);
localStream.Seek(0, System.IO.SeekOrigin.End);
do
{
cnt = remoteStream.Read(buf, 0, buf.Length);
localStream.Write(buf, 0, cnt);
} while (cnt == buf.Length);
}
}
}
return(true);
}
//FtpClient client = LoginFtp(ftpAddress);
//if (System.IO.File.Exists(localFilename))
//{
// Xceed.FileSystem.DiskFile file = new Xceed.FileSystem.DiskFile(localFilename);
// using (System.IO.Stream localStream = file.OpenWrite(false))
// {
// client.ReceiveFile(remoteFilename, file.Size, localStream);
// }
//}
//else
//{
// client.ReceiveFile(remoteFilename, localFilename);
//}
}