vb编程ftp带源程序

VB编程可以使用FTP（文件传输协议）来实现文件的上传和下载功能。以下是一个使用VB编程实现FTP上传文件的源程序示例：

Imports System.Net
Imports System.IO

Public Class FTPUploader
    Public Sub UploadFile(ByVal localFilePath As String, ByVal remoteUrl As String, ByVal ftpUsername As String, ByVal ftpPassword As String)
        Dim webRequest As FtpWebRequest = CType(FtpWebRequest.Create(remoteUrl), FtpWebRequest)
        webRequest.Method = WebRequestMethods.Ftp.UploadFile
        webRequest.Credentials = New NetworkCredential(ftpUsername, ftpPassword)
        
        Dim fileStream As FileStream = File.OpenRead(localFilePath)
        Dim requestStream As Stream = webRequest.GetRequestStream()
        Dim buffer(1024) As Byte
        Dim bytesRead As Integer = fileStream.Read(buffer, 0, buffer.Length)
        
        Do While bytesRead > 0
            requestStream.Write(buffer, 0, bytesRead)
            bytesRead = fileStream.Read(buffer, 0, buffer.Length)
        Loop
        
        fileStream.Close()
        requestStream.Close()
        
        Dim response As FtpWebResponse = CType(webRequest.GetResponse(), FtpWebResponse)
        Console.WriteLine("File Upload Complete. Status: {0}", response.StatusDescription)
        
        response.Close()
    End Sub
End Class

Sub Main()
    Dim uploader As New FTPUploader()
    Dim localFilePath As String = "C:\example.txt"
    Dim remoteUrl As String = "ftp://example.com/uploads/example.txt"
    Dim ftpUsername As String = "username"
    Dim ftpPassword As String = "password"
    
    uploader.UploadFile(localFilePath, remoteUrl, ftpUsername, ftpPassword)
End Sub

以上的源程序通过引用`System.Net`和`System.IO`命名空间来提供FTP文件上传功能。它使用`FtpWebRequest`类来创建FTP请求，设置请求的方法为上传文件。然后，通过`Credentials`属性设置FTP服务器的用户名和密码。

接下来，源程序打开本地文件并将其读取到一个缓冲区中，再将缓冲区的内容写入到FTP请求的请求流中。循环读取和写入直至文件读取完成。

文件上传完成后，通过`GetResponse`方法获取FTP响应，并输出响应的状态描述。

在`Main`函数中，定义了一个FTPUploader的实例，并设置了本地文件路径、远程URL、FTP用户名和密码等参数。通过调用`UploadFile`方法，即可实现文件的FTP上传。

以上是一个简单的使用VB编程实现FTP上传文件的源程序示例，你可以根据自己的实际需求进行修改和扩展。