一些结构和API在非FTP方式文档中有了定义就不再说明。一、API声明function uLong InternetOpenA(string lpszAgent, ulong dwAccessType,string lpszProxyName,string lpszProxyBypass, ulong dwFlags) library "wininet.dll"function ulong InternetConnectA(ulong hInternet,string lpszServerName,ulong nServerPort,string lpszUsername,string lpszPassword,ulong dwService,ulong dwFlags,ulong dwContext) library "wininet.dll"function boolean InternetCloseHandle(ulong hInternet) library "wininet.dll"function boolean FtpSetCurrentDirectoryA(ulong h...