这段代码展示了如何使用VB6通过FTP协议将文件上传到服务器。主要包含`InternetOpen`、`InternetConnect`、`FtpPutFile`等WinInet API函数，实现了文件的上传功能，并提供了下载和检查文件是否存在等辅助函数。
Option Explicit
Private Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" _
(ByVal sAgent As String, ByVal LAccessType As Long, ByVal sProxyName As String, _
ByVal SProxyBypass As String, ByVal lFlags As Long) As Long
Private Declare Function InternetConnect Lib "wininet.dll" Alias "InternetConnectA" _
(ByVal hInternetSession As Long, ByVal sServerName As String, _
ByVal nServerPort As Integer, ByVal sUsername As String, _
ByVal sPassword As String, ByVal lService As Long, _
ByVal lFlags As Long, ByVal lContext As Long) As Long
Private Declare Function FtpGetFile Lib "wininet.dll" Alias "FtpGetFileA" _
(ByVal hFtpSession As Long, ByVal lpszRemoteFile As String, _
ByVal lpszNewFile As String, ByVal fFailIfExists As Boolean, _
ByVal dwFlagsAndAttributes As Long, ByVal dwFlags As Long, _
ByVal dwContext As Long) As Boolean
Private Declare Function FtpPutFile Lib "wininet.dll" Alias "FtpPutFileA" _
(ByVal hFtpSession As Long, ByVal lpszLocalFile As String, _
ByVal lpszRemoteFile As String, ByVal dwFlags As Long, _
ByVal dwContext As Long) As Boolean
Private Declare Function FtpDeleteFile Lib "wininet.dll" Alias "FtpDeleteFileA" _
(ByVal hFtpSession As Long, ByVal lpszFileName As String) As Boolean
Private Declare Function FtpRenameFile Lib "wininet.dll" Alias "FtpRenameFileA" _
(ByVal hFtpSession As Long, ByVal lpszExsiting As String, ByVal lpszNew As String) As Boolean
Private Declare Function InternetCloseHandle Lib "wininet.dll" (ByVal hInet As Long) As Integer
Private Declare Function FtpFindFirstFile Lib "wininet.dll" Alias "FtpFindFirstFileA" _
(ByVal hFtpSession As Long, ByVal lpszSearchFile As String, _
lpFindFileData As WIN32_FIND_DATA, ByVal dwFlags As Long, _
ByVal dwContent As Long) As Long
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