The class implements basic FTP operations: connection, directories, downloading and uploading files. All functionality comes from the Microsoft Wininet API library.
Simple FTP manager form built on this class:
Here is a sample code that uses this class.
The interface:
FUNCTION FtpConnect(lcHost, lcUsr, lcPswd)
PROCEDURE FtpDisconnect
PROPERTY IsConnected
FUNCTION GetCurrentDir
FUNCTION SetCurrentDir(lcDir)
FUNCTION RemoveDir(lcDir)
FUNCTION CreateDir(lcDir)
FUNCTION DirExists(lcDir)
FUNCTION Dir2Cursor(lcCursor)
FUNCTION PutToFtp(lcLocalFile, lcRemoteFile, lnChunkSize)
FUNCTION GetFromFtp(lcRemoteFile, lcLocalFile, lnChunkSize)
FUNCTION BeforePutFile(lcLocalFile, lcRemoteFile)
PROCEDURE AfterPutFile(lcLocalFile, lcRemoteFile, lResult)
PROCEDURE OnPutChunk(lcLocalFile, lcRemoteFile, lnBytesWritten)
FUNCTION BeforeGetFile(lcRemoteFile, lcLocalFile)
PROCEDURE AfterGetFile(lcRemoteFile, lcLocalFile, lResult)
PROCEDURE OnGetChunk(lcRemoteFile, lcLocalFile, lnBytesWritten)
See also:
Winsock: accessing FTP
Using FTPCommand
More advanced VFP-based FTP solution:
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Because of the VFP one-process and one-thread nature such FTP class -- under some circumstances -- is able to freeze the whole VFP application. With less reliable FTP connections I would choose an external library allowing to drop a frozen FTP connection.
* * *
To create a passive data connection to an FTP server, use INTERNET_FLAG_PASSIVE for dwFlags parameter in the InternetConnect call:
#DEFINE INTERNET_INVALID_PORT_NUMBER 0
#DEFINE INTERNET_SERVICE_FTP 1
#DEFINE INTERNET_FLAG_PASSIVE 0x08000000
nFlags = INTERNET_FLAG_PASSIVE && use 0 for the active mode
hConnection = InternetConnect(m.hInternet, m.host,;
INTERNET_INVALID_PORT_NUMBER,;
m.usr, m.cPsw, INTERNET_SERVICE_FTP, m.nFlags, 0)
#kwd: sln_ftp. |
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