Nice answer, thx for posting it.
On Sun, Jan 22, 2017 at 4:13 AM, Tim Selander via use-livecode <
use-livecode@lists.runrev.com> wrote:
> 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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>>>>
>>>>
>>>> --
>>> Phil Davis
>>>
>>>
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