Demo_C#_Winform Ftp异步下载文件，更新ProgressBar
由于研究Winform项目的版本自动检测更新，需要用到Ftp下载更新包文件。
特写出这个小Demo.
我的Ftp是本地用IIS搭建的FTP服务器，下载过一个1.8G的视频文件，亲测有效。
注意点:
- Ftp类编写需要参考FTP的帮助文档
- 同步更新下载进度状态、下载完成状态的方法：将更新事件的方法绑定到Ftp封装类公布的事件中。
- 多线程控制窗体控件的时候不能直接对控件进行赋值等操作，需要将操控UI的代码写在一个委托当中，然后用This.Invoke(操控控件委托)。
运行效果如图：
内容比较多，我会上传Demo附件
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Framework;
namespace DemoFtp
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
txtLocalPath.Text = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);
}
/// Ftp封装类
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace Framework
{
/// 传输模式
public FtpTransferType TransferType
{
get {
return _TransferType; }
set
{
if (value == _TransferType) return; //如果TransferType已经一样则不重复发送
if (value == FtpTransferType.Binary)
SendCommand("TYPE I");//binary类型传输
else
SendCommand("TYPE A");//ASCII类型传输
if (ReplyCode != 200)
throw new IOException(ReplyMessage.Substring(4));
else
_TransferType = value;
}
}
#endregion
#region EventArgs
/// " )
{
newFileStruct.IsDirectory = true;
str = (str.Substring(5, str.Length - 5)).Trim();
}
else
{
newFileStruct.Length = Convert.ToDouble(str.Substring(0, str.IndexOf(" ")));
str = str.Substring(str.IndexOf(" ") + 1);
newFileStruct.IsDirectory = false;
}
newFileStruct.Name = str;
return newFileStruct;
}
/// 如果加载字节不等于总字节长度，则返回0表示失败；成功则返回总字节长度，表示成功。
public long DownLoadFile(string remoteFileName, string LocalFilePath)
{
string strFolder = new FileInfo(LocalFilePath).DirectoryName;
return DownLoadFile(remoteFileName, strFolder, Path.GetFileName(LocalFilePath));
}
/// 如果加载字节不等于总字节长度，则返回0表示失败；成功则返回总字节长度，表示成功。
public long DownLoadFile(string remoteFileName, string folderPath, string localFileName)
{
if (!IsConnected) Connect();
TransferType =FtpTransferType.Binary;
if (localFileName.Equals("")) localFileName = remoteFileName;
long fileLength = GetFileSize(remoteFileName);
Socket dataSocket = CreateDataSocket();
long currentPrcess = 0;
SendCommand("RETR " + remoteFileName);
if (!(ReplyCode == 150 || ReplyCode == 125 || ReplyCode == 226 || ReplyCode == 250))
{
throw new IOException(ReplyMessage.Substring(4));
}
FileStream outputFileStream = new FileStream(folderPath + "\\" + localFileName, FileMode.Create);
System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
long elapsedMillisecondsRemark = 0;
stopWatch.Start();
while (true)
{
int intBytes = dataSocket.Receive(_Buffer, _Buffer.Length, 0);
currentPrcess += intBytes;
outputFileStream.Write(_Buffer, 0, intBytes);
if ((stopWatch.ElapsedMilliseconds - elapsedMillisecondsRemark) >= AsyncTriggerInterval)
{
DownloadProgressChanged?.Invoke(this, new UpDownLoadProcessArgs(currentPrcess, fileLength));
elapsedMillisecondsRemark = stopWatch.ElapsedMilliseconds;
}
if (intBytes <= 0)
{
DownloadProgressChanged?.Invoke(this, new UpDownLoadProcessArgs(currentPrcess, fileLength));
break;
}
}
stopWatch.Stop();
outputFileStream.Close();
dataSocket.Close();
DownloadDataCompleted?.Invoke(this, new UpDownLoadCompletedArgs(currentPrcess, fileLength));
if (!(ReplyCode == 226 || ReplyCode == 250))
{
FetchReply();
if (!(ReplyCode == 226 || ReplyCode == 250))
throw new IOException(ReplyMessage.Substring(4));
}
return currentPrcess != fileLength ? 0 : currentPrcess;
}
/// 如果加载字节不等于总字节长度，则返回0表示失败；成功则返回总字节长度，表示成功。
public long DownLoadFile(string remoteFileName, string folderPath, string localFileName, System.Threading.CancellationToken cancel)
{
if (!IsConnected) Connect();
TransferType = FtpTransferType.Binary;
if (localFileName.Equals("")) localFileName = remoteFileName;
long fileLength = GetFileSize(remoteFileName);
Socket dataSocket = CreateDataSocket();
long currentPrcess = 0;
SendCommand("RETR " + remoteFileName);
if (!(ReplyCode == 150 || ReplyCode == 125 || ReplyCode == 226 || ReplyCode == 250))
throw new IOException(ReplyMessage.Substring(4));
FileStream outputFileStream = new FileStream(folderPath + "\\" + localFileName, FileMode.Create);
System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
long elapsedMillisecondsRemark = 0;//定义刷新间隔
stopWatch.Start();
int intBytes = 0;
while (!cancel.IsCancellationRequested)
{
intBytes = dataSocket.Receive(_Buffer, _Buffer.Length, 0);
currentPrcess += intBytes;
outputFileStream.Write(_Buffer, 0, intBytes);
if ((stopWatch.ElapsedMilliseconds - elapsedMillisecondsRemark) >= AsyncTriggerInterval)
{
DownloadProgressChanged?.Invoke(this, new UpDownLoadProcessArgs(currentPrcess, fileLength));
elapsedMillisecondsRemark = stopWatch.ElapsedMilliseconds;
}
if (intBytes <= 0)
{
DownloadProgressChanged?.Invoke(this, new UpDownLoadProcessArgs(currentPrcess, fileLength));
break;
}
}
stopWatch.Stop();
outputFileStream.Close();
dataSocket.Close() ;
DownloadDataCompleted?.Invoke(this, new UpDownLoadCompletedArgs(currentPrcess, fileLength));
if (!cancel.IsCancellationRequested)
{
//如果没有取消
if (!(ReplyCode == 226 || ReplyCode == 250))
{
FetchReply();
if (!(ReplyCode == 226 || ReplyCode == 250))
throw new IOException(ReplyMessage.Substring(4));
}
}
return currentPrcess != fileLength ? 0 : currentPrcess;
}
/// 如果上传字节不等于总字节长度，则返回0表示失败；成功则返回总字节长度，表示成功。
public long UploadFile(string uploadFileName, string locaFilePath)
{
if (!IsConnected) Connect();
Socket dataSocket = CreateDataSocket();
SendCommand("STOR " + Path.GetFileName(uploadFileName));
if (!(ReplyCode == 125 || ReplyCode == 150))
throw new IOException(ReplyMessage.Substring(4));
FileStream inputFileStream = new FileStream(locaFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
long fileLength = inputFileStream.Length;
long currentPrcess = 0;
System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
long elapsedMillisecondsRemark = 0;
stopWatch.Start();
int intBytes;
while ((intBytes = inputFileStream.Read(_Buffer, 0, _Buffer.Length)) > 0)
{
currentPrcess += intBytes;
if ((stopWatch.ElapsedMilliseconds - elapsedMillisecondsRemark) >= AsyncTriggerInterval)
{
UploadProgressChanged?.Invoke(dataSocket, new UpDownLoadProcessArgs(currentPrcess, fileLength));
elapsedMillisecondsRemark = stopWatch.ElapsedMilliseconds;
}
dataSocket.Send(_Buffer, intBytes, 0);
}
inputFileStream.Close();
dataSocket.Close();
stopWatch.Stop();
UploadFileCompleted?.Invoke(this, new UpDownLoadCompletedArgs(currentPrcess, fileLength));
if (!(ReplyCode == 226 || ReplyCode == 250))
{
FetchReply();
if (!(ReplyCode == 226 || ReplyCode == 250))
throw new IOException(ReplyMessage.Substring(4));
}
return currentPrcess == fileLength ? currentPrcess : 0;
}
/// 返回当前字节长度
public long UploadFile(string uploadFileName, string localFilePath, System.Threading.CancellationToken cancel)
{
if (!IsConnected) Connect();
Socket dataSocket = CreateDataSocket();
SendCommand("STOR " + Path.GetFileName(uploadFileName));
if (!(ReplyCode == 125 || ReplyCode == 150))
throw new IOException(ReplyMessage.Substring(4));
FileStream inputFileStream = new FileStream(localFilePath, FileMode.Open, FileAccess.Read);
long fileLength = inputFileStream.Length;
long currentPrcess = 0;
System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
long elapsedMillisecondsRemark = 0;
stopWatch.Start();
int intBytes;
while ((intBytes = inputFileStream.Read(_Buffer, 0, _Buffer.Length)) > 0)
{
currentPrcess += intBytes;
if ((stopWatch.ElapsedMilliseconds - elapsedMillisecondsRemark) >= AsyncTriggerInterval)
{
UploadProgressChanged?.Invoke(dataSocket, new UpDownLoadProcessArgs(currentPrcess, fileLength));
elapsedMillisecondsRemark = stopWatch.ElapsedMilliseconds;
}
dataSocket.Send(_Buffer, intBytes, 0);
if (cancel.IsCancellationRequested) {
break; }//取消了进度,不支持继传
}
inputFileStream.Close();
stopWatch.Stop();
dataSocket.Close();
UploadFileCompleted?.Invoke(this, new UpDownLoadCompletedArgs(currentPrcess, fileLength));
if (!cancel.IsCancellationRequested)
{
//如果没有取消
if (!(ReplyCode == 226 || ReplyCode == 250))
{
FetchReply();
if (!(ReplyCode == 226 || ReplyCode == 250))
throw new IOException(ReplyMessage.Substring(4));
}
}
return currentPrcess;
}
/// 返回当前字节长度
public long UploadFileExt(string uploadFilePath, string locaFileName, System.Threading.CancellationToken cancel)
{
string folderPath = uploadFilePath.Replace(Path.GetFileName(uploadFilePath), "");
if (!string.IsNullOrEmpty(folderPath))
ChangeWorkDirectory(folderPath);
string tempFileName = SuperCode.GetMD5(Path.GetFileName(uploadFilePath));
var uploadedFileLength = UploadFile(tempFileName, locaFileName, cancel);
if (!cancel.IsCancellationRequested)
{
var error = Rename(tempFileName, uploadFilePath);
if (!string.IsNullOrEmpty(error))
throw new Exception(error);
}
DeleteFile(tempFileName);
ChangeWorkDirectory(WorkDirectory);
return uploadedFileLength;
}
/// 如果有错误返回错误文本，反之返回空字符串
public string MakeDirectory(string directoryPath)
{
if (!IsConnected) Connect();
SendCommand("MKD " + directoryPath);
if (!(ReplyCode == 257 || ReplyCode == 250))
return ReplyMessage;
return string.Empty;
}
/// 如果有错误返回错误文本，反之返回空字符串
public string RemoveDirectory(string strDirName)
{
if (!IsConnected) Connect();
SendCommand("RMD " + strDirName);
if (ReplyCode != 250)
return ReplyMessage;
return string.Empty;
}
/// 数据连接socket
private Socket CreateDataSocket()
{
SendCommand("PASV");
if (ReplyCode != 227)
throw new IOException(ReplyMessage.Substring(4));
int index1 = ReplyMessage.IndexOf('(');
int index2 = ReplyMessage.IndexOf(')');
var ipData = ReplyMessage.Substring(index1 + 1, index2 - index1 - 1).Split(',');
int[] parts = new int[6];
for (int i = 0; i < ipData.Length; i++)
{
try
{
parts[i] = Int32.Parse(ipData[i]);
}
catch (Exception)
{
throw new IOException("不能识别的 PASV 应答码: " + ReplyMessage);
}
}
string ipAddress = parts[0] + "." + parts[1] + "." + parts[2] + "." + parts[3];
int port = (parts[4] << 8) + parts[5];
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(IPAddress.Parse(ipAddress), port);
try
{
s.Connect(ep);
}
catch (Exception)
{
throw new IOException("不能建立数据连接");
}
return s;
}
/// 包含应答码的字符串行
private void FetchReply()
{
ReplyMessage = "";
while (true)
{
int bytesLength = _SocketControl.Receive(_Buffer, _Buffer.Length, 0);
ReplyMessage += Encoder.GetString(_Buffer, 0, bytesLength);
if (bytesLength < _Buffer.Length) break;
}
char[] seperator = {
'\n' };
string[] messageArray = ReplyMessage.Split(seperator);
if (messageArray.Length > 2)
ReplyMessage = messageArray[messageArray.Length - 2];
//seperator[0]是10,换行符是由13和10组成的,分隔后10后面虽没有字符串,
//但也会分配为空字符串给后面(也是最后一个)字符串数组,
//所以最后一个messageArray是没用的空字符串
//但为什么不直接取mess[0],因为只有最后一行字符串应答码与信息之间有空格
else
ReplyMessage = messageArray[0];
if (string.IsNullOrEmpty(ReplyMessage)||!ReplyMessage.Substring(3, 1).Equals(" "))//返回字符串正确的是以应答码(如220开头, 后面接一空格, 再接问候字符串)
{
tryConnectTimes++;
if (tryConnectTimes >= 100)
{
IsConnected = false;
throw new Exception($"Ftp多次尝试获取返回数据失败！\r\n请见检查DNS解析是否失败！当前尝试连接IP地址为{_IPAddress.ToString()}");
}
FetchReply();
}
ReplyCode = Int32.Parse(ReplyMessage.Substring(0, 3));
}
/// MD5码
public static string GetMD5(string source, int code = 2)
{
byte[] sor = Encoding.UTF8.GetBytes(source);
string mode = "x2";
MD5 md5 = MD5.Create();
byte[] result = md5.ComputeHash(sor);
StringBuilder strbul = new StringBuilder();
if (code > 2) mode = "x" + code.ToString();
for (int i = 0; i < result.Length; i++)
{
strbul.Append(result[i].ToString(mode));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位
}
return strbul.ToString();
}
#endregion
}
}