vb.net filestream转byte

将一个文件转换为字节数组可以使用 VB.NET 中的 FileStream 类和 BinaryReader 类。以下是一个示例代码：

Dim filePath As String = "文件路径"
Dim fileBytes() As Byte

Using fs As New FileStream(filePath, FileMode.Open, FileAccess.Read)
    Using br As New BinaryReader(fs)
        fileBytes = br.ReadBytes(fs.Length)
    End Using
End Using

在上面的代码中，首先定义了一个文件路径。然后通过创建一个 FileStream 对象来打开文件，并使用 BinaryReader 读取文件中的所有字节。最后，将读取的字节存储在一个 byte 数组中。

相关问题

vb.net ftp 模块

VB.NET中提供了FTP模块用于实现与FTP服务器的交互。FTP即文件传输协议，可用于上传或下载文件到远程服务器。

在VB.NET中，我们可以使用System.Net命名空间中的FtpWebRequest和FtpWebResponse类来创建FTP请求和接收服务器的响应。以下是VB.NET代码示例：

Imports System.Net
Imports System.IO

Public Class FTPClient
    Public Sub UploadFileToFtp(ByVal filePath As String, ByVal ftpServerUrl As String, ByVal username As String, ByVal password As String)
        Dim request As FtpWebRequest = CType(WebRequest.Create(ftpServerUrl), FtpWebRequest)
        request.Method = WebRequestMethods.Ftp.UploadFile
        request.Credentials = New NetworkCredential(username, password)

        Dim fileData As Byte() = File.ReadAllBytes(filePath)
        request.ContentLength = fileData.Length

        Using requestStream As Stream = request.GetRequestStream()
            requestStream.Write(fileData, 0, fileData.Length)
        End Using

        Using response As FtpWebResponse = CType(request.GetResponse(), FtpWebResponse)
            Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription)
        End Using
    End Sub

    Public Sub DownloadFileFromFtp(ByVal filePath As String, ByVal ftpServerUrl As String, ByVal username As String, ByVal password As String)
        Dim request As FtpWebRequest = CType(WebRequest.Create(ftpServerUrl), FtpWebRequest)
        request.Method = WebRequestMethods.Ftp.DownloadFile
        request.Credentials = New NetworkCredential(username, password)

        Using response As FtpWebResponse = CType(request.GetResponse(), FtpWebResponse)
            Using responseStream As Stream = response.GetResponseStream()
                Using fileStream As FileStream = File.Create(filePath)
                    responseStream.CopyTo(fileStream)
                End Using
            End Using
        End Using

        Console.WriteLine("Download File Complete")
    End Sub
End Class

上述示例代码中，UploadFileToFtp方法用于将本地文件上传到FTP服务器，DownloadFileFromFtp方法用于从FTP服务器下载文件到本地。在调用这两个方法时，需要传入文件路径、FTP服务器地址、用户名和密码等参数。

这是VB.NET中使用FTP模块实现FTP文件传输的基本示例，可以在此基础上进行进一步的扩展和应用。

vb.net发送文件

VB.NET发送文件可以使用Socket进行网络通信。首先，我们需要创建一个服务器端和一个客户端。

服务器端代码如下：

Imports System.IO
Imports System.Net
Imports System.Net.Sockets

Public Class Server
    Public Shared Sub Main()
        Dim serverIp As IPAddress = IPAddress.Parse("服务器IP地址")
        Dim serverPort As Integer = 8888

        ' 创建服务器Socket
        Dim serverSocket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
        serverSocket.Bind(New IPEndPoint(serverIp, serverPort))
        serverSocket.Listen(10)

        Console.WriteLine("等待客户端连接...")
        Dim clientSocket As Socket = serverSocket.Accept()
        Console.WriteLine("客户端已连接")

        ' 读取文件
        Dim filePath As String = "文件路径"
        Dim fileBytes As Byte() = File.ReadAllBytes(filePath)

        ' 发送文件大小给客户端
        Dim fileSize As Integer = fileBytes.Length
        Dim fileSizeBytes As Byte() = BitConverter.GetBytes(fileSize)
        clientSocket.Send(fileSizeBytes)

        ' 发送文件给客户端
        clientSocket.Send(fileBytes)
        Console.WriteLine("文件已发送")

        ' 关闭连接
        clientSocket.Shutdown(SocketShutdown.Both)
        clientSocket.Close()
        serverSocket.Close()
        Console.WriteLine("连接已关闭")
    End Sub
End Class

客户端代码如下：

Imports System.IO
Imports System.Net
Imports System.Net.Sockets

Public Class Client
    Public Shared Sub Main()
        Dim serverIp As IPAddress = IPAddress.Parse("服务器IP地址")
        Dim serverPort As Integer = 8888

        ' 创建客户端Socket
        Dim clientSocket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
        clientSocket.Connect(New IPEndPoint(serverIp, serverPort))

        ' 接收服务器发送的文件大小
        Dim fileSizeBytes(3) As Byte
        clientSocket.Receive(fileSizeBytes)
        Dim fileSize As Integer = BitConverter.ToInt32(fileSizeBytes, 0)

        ' 接收文件内容
        Dim receivedBytes As Integer = 0
        Dim buffer(1024) As Byte
        Using fileStream As New FileStream("保存文件路径", FileMode.Create, FileAccess.Write)
            While receivedBytes < fileSize
                Dim bytesRead As Integer = clientSocket.Receive(buffer)
                fileStream.Write(buffer, 0, bytesRead)
                receivedBytes += bytesRead
            End While
        End Using
        Console.WriteLine("文件已接收")

        ' 关闭连接
        clientSocket.Shutdown(SocketShutdown.Both)
        clientSocket.Close()
        Console.WriteLine("连接已关闭")
    End Sub
End Class

注意替换代码中的服务器IP地址、服务器端口、文件路径和保存文件路径为实际的值。服务器端首先等待客户端连接，然后读取要发送的文件并发送给客户端。客户端首先连接服务器，然后接收服务器发送的文件大小，最后按照文件大小逐步接收文件内容并保存到本地。

运行服务器端和客户端，即可完成文件的发送和接收过程。