vb.net大文件传输 vbnet fileget

求大神指点 vb.net 怎么发送大文件 我用 UdpClient 的Send只能发送5000字节以下的

下载，直接通过url读取文件，然后Response.OutputStream.Write()数据

下面提供个下载的静态方法，是C#的，供参考：

/// summary

/// 下载文件

/// /summary

/// param name="fileName"下载的文件名称（包括扩展名）/param

/// param name="filePath"下载文件的绝对路径/param

public static void DownFile(string fileName, string filePath)

{

    //打开要下载的文件，并把该文件存放在FileStream中                

    System.IO.FileStream Reader = System.IO.File.OpenRead(filePath);

    //文件传送的剩余字节数：初始值为文件的总大小                

    long Length = Reader.Length;

    HttpContext.Current.Response.Buffer = false;

    HttpContext.Current.Response.AddHeader("Connection", "Keep-Alive");

    HttpContext.Current.Response.ContentType = "application/octet-stream";

    HttpContext.Current.Response.Charset = "utf-8";

    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(fileName));

    HttpContext.Current.Response.AddHeader("Content-Length", Length.ToString());

    byte[] Buffer = new Byte[10000];//存放欲发送数据的缓冲区                

    int ByteToRead; //每次实际读取的字节数               

    while (Length  0)

    {    

 //剩余字节数不为零，继续传送                    

        if (HttpContext.Current.Response.IsClientConnected)

        {    

//客户端浏览器还打开着，继续传送                        

            ByteToRead = Reader.Read(Buffer, 0, 10000);                   //往缓冲区读入数据                        

            HttpContext.Current.Response.OutputStream.Write(Buffer, 0, ByteToRead);    

//把缓冲区的数据写入客户端浏览器                        

            HttpContext.Current.Response.Flush(); //立即写入客户端                        

            Length -= ByteToRead;//剩余字节数减少                            }

        else

        {                         

//客户端浏览器已经断开，阻止继续循环                        

            Length = -1;

        }

    }                //关闭该文件               

    Reader.Close();

}

vb.net怎么实现串口传输文件

Imports System

Imports System.IO.Ports

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

'获取计算机有效串口

Dim ports As String() = SerialPort.GetPortNames() '必须用命名空间，用SerialPort,获取计算机的有效串口

Dim port As String

For Each port In ports

portnamebox.Items.Add(port) '向combobox中添加项

Next port

'初始化界面

vb.net udpclient 发送大文件循环问题

'缓冲区长度

Const BufLen As Integer=800

'包发送间隔

Const Interval As Integer=62

'缓冲区

Dim buf As Byte()=Nothing

'远程（目的）网络端点

Dim remoteep As IPEndPoint=Nothing

'如果你已将s定义为类的成员变量（实例或共享），注释掉下面这句

Dim s As UdpClient=Nothing

Dim willread As Integer

Try

buf=New Byte(BufLen-1) {}

s=New UdpClient()

' TextBox1.Text包含远程（目的）主机的IP地址

' TextBox2.Text包含远程（目的）主机的端口号

remoteep=New IPEndPoint(IPAddress.Parse(Trim(TextBox1.Text)),CInt(TextBox2.Text))

' Label2.Text包含要发送的文件的路径

Using fs As New FileStream(Label2.Text,FileMode.Open,FileAccess.Read)

While fs.Positionfs.Length

willread=BufLen

If fs.Length-fs.PositionBufLen Then

willread=CInt(fs.Length-fs.Position)

End If

fs.Read(buf,0,willread)

s.Send(buf,willread,remoteep)

Thread.Sleep(Interval)

End While

End Using

Catch ex As Exception

MsgBox(ex.ToString())

Finally

If s IsNot Nothing Then

s.Close()

End If

End Try

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