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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 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 FtpPutFile Lib "wininet.dll" Alias "FtpPutFileA" (ByVal hConnect As Long, ByVal lpszLocalFile As String, ByVal lpszNewRemoteFile As String, ByVal dwFlags As Long, ByVal dwContext As Long) As Boolean
Private Declare Function InternetCloseHandle Lib "wininet.dll" (ByVal hInet As Long) As Integer
Private Declare Function FtpSetCurrentDirectory Lib "wininet.dll" Alias "FtpSetCurrentDirectoryA" (ByVal hFtpSession As Long, ByVal lpszDirectory As String) As Boolean
Const INTERNET_OPEN_TYPE_PRECONFIG = 0
Const INTERNET_DEFAULT_FTP_PORT = 21
Const INTERNET_SERVICE_FTP = 1
Const PassiveConnection As Boolean = True
Const INTERNET_FLAG_PASSIVE = &H8000000
Const FTP_TRANSFER_TYPE_UNKNOWN = &H0

Dim hConnection, hOpen, Num As Long
Private Sub Command1_Click()

    hOpen = InternetOpen("IE", INTERNET_OPEN_TYPE_PRECONFIG, vbNullString, vbNullString, 0)
    DoEvents
    hConnection = InternetConnect(hOpen, "host", INTERNET_DEFAULT_FTP_PORT, "user", "pass", INTERNET_SERVICE_FTP, IIf(PassiveConnection, INTERNET_FLAG_PASSIVE, 0), 0)
    DoEvents
    FtpSetCurrentDirectory hConnection, "\"
    DoEvents
    FtpPutFile hConnection, "C:\prueba", "prueba", FTP_TRANSFER_TYPE_UNKNOWN, 0
    DoEvents
    InternetCloseHandle hConnection
    InternetCloseHandle hOpen
End Sub
Private Sub Form_Load()

End Sub

FtpPutFile hConnection, "C:\prueba.txt", "prueba.txt_" & replace(time(),":","_"), FTP_TRANSFER_TYPE_UNKNOWN, 0