Phil and Mike, Thanks for your pointers -- both look like they
will work. Also in continuing to poke around the web, I also
found this function that works:
function qrtHTTP_FileExists pURL
breakpoint
local tSocket, tPath, tHeaders, tCommand
set the itemDelimiter to "/"
-- extract host IP address and file path from the URL
put item 3 of pURL into tHost
if tHost contains ":" then
put tHost into tSocket
else
put tHost & ":80" into tSocket
end if
put "/" & item 4 to -1 of pURL into tPath
-- build the command
put "HEAD" && tPath && "HTTP/1.1" into tCommand
-- build the http headers
put "Connection: Close" & CRLF & \
"Host:" && tHost & CRLF & \
"User-Agent: Revolution (" & the version & ")" into tHeaders
-- open the socket, write he request and read the response
open socket tSocket
write tCommand & CRLF & tHeaders & CRLF & CRLF to socket tSocket
read from socket tSocket until CRLF
put word 2 of it into tResultCode
close socket tSocket
-- return our interpretation of the result code
return (tResultCode = 200)
end qrtHTTP_FileExists
It's working for me.... but now I can't re-find it so I can't
credit whoever wrote it!
Copying here for posterity!
Tim Selander
Tokyo, Japan
On 2017.01.22, 19:09, Mike Bonner via use-livecode wrote:
If you have php on your second server, and don't have lc, you can do a
check with php similar to what you're talking about. This is untested but..
If you have the following php file (perhaps named checkforfile.php) on the
alternate server, and send it a get request containing the path to the file
youre looking for, it will return true or false if it exists. This is
obviously an extremely bare example. You'd want to make sure the get
contains "myfile" and handle that too, as well as any other issues. In
addition, you would probably want to limit the requests to only allowed
areas and file types in the php script.
<?php
echo file_exists($_GET["myfile"]);
?>
From the lc side of things you could do something like this..
<?lc
get url "
http://your.alternateserver.com/checkforfile.php?myfile=theFile.mp3";
if it is true then
put "<audio src=http://my.programserver.com/theFile.mp3>"
else
put "program not found."
end if
?>
Of course if you DO have lc on the program server you can do the same type
of check and "put" true or false just like you did with php. (Also can be
done with javascript, asp, etc)
On Sun, Jan 22, 2017 at 2:16 AM, Phil Davis via use-livecode <
use-livecode@lists.runrev.com> wrote:
Hi Tim,
Here is a very simplistic way of checking for a file on your server. It
assumes your mp3 files are in a 'programs' folder that resides in the
'document root' folder. This script as it is here would be in a .lc file on
your server. You pass it a filename in the url and it tells you if the file
is in the programs folder or not.
So the url would look something like this:
http://my.programserver.com/check.lc?1234.mp3
The text of the 'check.lc' file:
<?lc
set the errorMode to "inline"
put $_SERVER["QUERY_STRING"] into tFilename
put $_SERVER["DOCUMENT_ROOT"] & "/programs/" & tFilename into tPath
if there is a file tPath then
put "Found file" && q(tFilename)
else
put "Did not find file" && q(tFilename)
end if
?>
<?lc
function q pString
return quote & pString & quote
end q
?>
This is most likely not exactly what you need, but maybe it'll give you a
starting point.
Thanks -
Phil Davis
On 1/21/17 11:36 PM, Tim Selander via use-livecode wrote:
Hi,
On-rev.com hosting, using LC server to present a list of our AM/FM radio
programs for people to listening to on-demand.
Out of a month's 20 programs, 3 or 4 might not get uploaded due to
copyright issues, etc. Also, mp3's are not on the on-rev.com server, but
another hosting service we use as well.
Filenaming is standardized, so I know the list of programs. I want to hit
the server, if the mp3 files exists, present it as an <audio src=, if the
mp3 file does not exists, present a "Sorry, program not available" message.
If I wanted to check on the existence of a small text file, it would be
fast enough for me to just get it, put it into a variable and see if the
variable has anything in it. But mp3's are too big, so too slow.
Locally, I would simply write "if there is a file 'filename'..." --
what's the equivalent command for checking on existence of a file on a
server?
Thanks in advance.
Tim Selander
Tokyo, Japan
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