----- Original Message -----
> From: Gies,Brad
> Sent: 7/6/2006 11:35:48 AM
> To: twsocket@elists.org
> Subject: Re: [twsocket] FTP missing bytes
>
> It seems the answer is that I now have to send the Type command before I
> do the PUT. Did it used to default to binary before, and now it defaults
> to ASCII?
Your FTP server has probably changed to a UNIX-type environment; or if it was
always UNIX, the default transfer mode has been changed. What happened to the
file is that it is being transmitted in ASCII mode, and a couple of bytes have
been removed when newline translations were wrongly executed. This will only
be a problem when transfering between heterogenous environments with differing
newline sequences (e.g. from Windows to UNIX, or from UNIX to Windows). Why?
Because...
1. Windows uses a CRLF (#13#10) pair for line-ends
2. While UNIX uses only the LF (#10) character for line-ends
2. Your file, even while being binary, probably contains a contiguous pair of
bytes with the sequence #13#10 in it
3. These 2-byte sequences are being (wrongly) translated to the UNIX newline
character #10, and a byte is being removed.
If two of these sequences exist in your file, that will cause two bytes to be
removed. Since the file is binary, this in essence corrupts it.
As others have mentioned, the best way to avoid this is to *always* call
SetType before transmitting and never assume that the server will default to
the correct type.
-dZ.
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