wwftp::onftpbufferupdate

Event that fires whenever the buffer is updated by FTPGetFileEx(). This method is passed the current download total and the number of chunks retrieved already. You can set lCancelDownload to .T. to force FTPGetEx to stop the file download.

o.onftpbufferupdate(lnbytesdownloaded,lnbufferreads,                    lcCurrentChunk,lnTotalBytes,loFtp)

Parameters

lnbytesdownloaded
Total bytes that have been downloaded on this request so far.

lnbufferreads
Total number of buffers that have been read so far.

lccurrentchunk
Content of the current download chunk read. File information is incremental so it's possible to capture text and append it to a file incrementally for possibly viewing information while it's downloading.

Remarks

Be careful with what kind of code you put into this 'event' method since it fires on every buffer update. It should be efficient and do little more than check for aborts and provide some visual feedback. Putting code here will slow down downloads.

Example

*** Load libs
DO wwFtp

PUBLIC oFTP as wwFTP
oFTP = CREATEOBJECT("wwFtp_Custom")

*** Abort download with hotkey
ON KEY LABEL ALT-X oFTP.lCancelDownload = .T.

*** Optional Username and password
*oFTP.cUsername = "rickstrahl"
*oFTP.cPassword = GETSYSTEMPASSWORD()

oFTP.FtpConnect("www.west-wind.com")

*** Download a file 
IF oFTP.FTPGetFileex("/wwipstuff.zip","d:\temp\wwipstuff.zip") != 0
   ? oFTP.cErrorMsg
ENDIF   

*** Upload a file
IF oFTP.FTPSendFileEx("d:\sailbig.jpg","/sailbig.jpg") != 0
   ? oFTP.cErrormsg
ENDIF

ON KEY LABEL Alt-X
RETURN


*** Custom class to override the OnFtpBufferUpdate method
DEFINE CLASS wwFtp_Custom as wwFTP

Function OnFTPBufferUpdate
LPARAMETER lnBytesDownloaded,lnBufferReads,lcCurrentChunk, lnTotalBytes, loFtp

DO CASE
  CASE lnBufferReads > 0
     wait window "Downloaded: " + TRANSFORM(lnBytesDownloaded)+ " bytes of " + ;
                 TRANSFORM(lnTotalBytes) + " (Alt-X to cancel)" nowait

  *** Error
  CASE lnBufferReader = -1 and loFtp.nError # 0
	wait window "An error occurred: " + this.cErrorMsg

  *** Cancelled
  CASE lnBufferReads = -1 AND loFtp.lCancelDownload
    wait window "Download aborted..." timeout 2

  *** Completed
  CASE lnBufferReads = -1 
     WAIT WINDOW "Download Completed." TIMEOUT 2
ENDCASE
RETURN

ENDDEFINE

See also:

Class wwftp | wwftp::lCancelDownload | wwftp::nFTPWorkBufferSize | Class wwFtp | wwftp::FTPSendFileEx

© West Wind Technologies, 1996-2019 • Updated: 06/09/11
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