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I need to check to see if an mp3 file exists on a remote server. Can someone help me with this code?
thanks,
Richie
It is not going to return a yes or no. It is going to return a structure. YOu then examin that structure to determine if it was a yes or no.
As BKBK showed
<cfhttp method="head" url="http://www.myurl.com/mymp3.mp3">
...
<cfdump var="#cfhttp#">
You would then be looking for a "200 OK" status. 200 OK is the HTTP status that the URL was found and returned what was requested.
<cfhttp...> documentation.
http://livedocs.adobe.com/coldfusion/8/htmldocs/Tags_g-h_09.html
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<cfhttp....> to the url of the MP3 on the server. Using the head option if you don't want to download the actual MP3 file.
A status 200 ok in the returned structer of the <cfhttp...> call would indicate that it exists, or at least something exists, at that url.
You may want to investigate other information in the returned structure to confirm that it is the specific desired content.
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Say the url is http://www.myurl.com/mymp3.mp3
How would I get <cfhttp to return a yes or a no?
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It is not going to return a yes or no. It is going to return a structure. YOu then examin that structure to determine if it was a yes or no.
As BKBK showed
<cfhttp method="head" url="http://www.myurl.com/mymp3.mp3">
...
<cfdump var="#cfhttp#">
You would then be looking for a "200 OK" status. 200 OK is the HTTP status that the URL was found and returned what was requested.
<cfhttp...> documentation.
http://livedocs.adobe.com/coldfusion/8/htmldocs/Tags_g-h_09.html
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Thanks guys.
I got it to work using
<cfhttp method="head" url="http//www.mywebsite.com/test.htm" result="sc">
<cfoutput>#sc.statuscode#</cfoutput>
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RichieWhite wrote:
How would I get ... a yes or a no?
You might decide to push the envelope, and do something like this instead:
<cfoutput>#fileExists("http://www.myurl.com/mymp3.mp3")#</cfoutput>
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That seems to push the envelope beyond the limit of possibility.
CF8 Documentation
fileExists Parameters
Parameter | Description |
---|---|
absolute_path | An absolute path |
CF9 Documentation
Parameter | Description |
---|---|
absolute_path | The absolute path of the on-disk or in-memory file. |
They seem to be pretty adamant that a URL is not an allowed value for the parameter.
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While it doesn't work, it also doesn't error - it just always returns false!
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
http://training.figleaf.com/
Read this before you post:
http://forums.adobe.com/thread/607238
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Dave Watts wrote:
While it doesn't work, it also doesn't error - it just always returns false!
Dave Watts, CTO, Fig Leaf Software
OK. So, let's take your own web site. Put this in your pipe and light up:
fileExists("http://www.figleaf.com/"): <cfoutput>#fileExists("http://www.figleaf.com/")#</cfoutput><br>
fileExists("http://www.figleaf.com/images/topbanner_products.jpg"): <cfoutput>#fileExists("http://www.figleaf.com/images/topbanner_products.jpg")#</cfoutput><br>
fileExists("http://www.figleaf.com/images/bkbk_test.jpg"): <cfoutput>#fileExists("http://www.figleaf.com/images/bkbk_test.jpg")#</cfoutput>
You should get (on CF9 at any rate):
yes
yes
no
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I don't smoke a pipe. But more importantly, I got NO NO NO. That's basically the test I tried before posting my response - I didn't know whether it would work or not. I'm running CF 9 on Windows x64, full JRun install.
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
http://training.figleaf.com/
Read this before you post:
http://forums.adobe.com/thread/607238
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Dave Watts wrote:
> I got NO NO NO.
I am curious what others got!
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Even I got NO NO NO; I m working in CF 9
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I got the same results you did, BKBK: Yes | Yes | No
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JMF wrote:
I got the same results you did, BKBK: Yes | Yes | No
Yey!
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Perhaps this is a 9.0.1 thing - I tested with 9.0.0 as I haven't upgraded this machine yet.
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
http://training.figleaf.com/
Read this before you post:
http://forums.adobe.com/thread/607238
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Dave Watts wrote:
Perhaps this is a 9.0.1 thing - I tested with 9.0.0 as I haven't upgraded this machine yet.
Indeed. I am on build 9.0.1.274703
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BKBK wrote:
Indeed. I am on build 9.0.1.274703
So now the question is - Is this documented anywhere as an enhancement|change in 9.0.1?
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Yeah, that could be it. I tested on a 9.0.1 installation.
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I tested with 9.0.1 and I get YES YES NO and there are a couple of
interesting things:
- cookies persist between function calls and page requests (in other
words if www.google.com sets a cookie in one request it will be sent
to google in subsequent page requests);
- it caches the connection so if you have multiple fileExists checks
it avoid opening and closing TCP connections;
- the connection to the server is not closed when the page requests is
completed (I think it stays open until the TCP timeout is reached).
- seems to do an extra HEAD request (for example if you have a single
fileExists the first HEAD request is done with "User-Agent: Jakarta
Commons-HttpClient/3.1" and the "real" request is done with
"User-Agent: Jakarta-Commons-VFS")
Interesting.
--
Mack
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Yeah, URLs seem to work for me on 9.0.1, too.
I'm not sure I'm convinced this is a sensible feature of fileExists(). Well it mostly seems OK, but something about it doesn't quite sit right for me. I guess it's because the operations to implement the "file system" side of things is completely different to that for checking URLs. And if I found myself writing a function which had two completely separate bits either side of an "else" statement, I'd start wondering if I was putting too much into the function.
What does it do with 30x responses? Also, does it do a HEAD request, or a full GET? I presume it's the latter.
Wouldn't it be nice if Adobe kept their docs up to date? Surely if someone had a ticket raised to "add this functionality to fileExists()", there should have also been a ticket to "update the documentation for fileExists()".
Personally I think I would have preferred a urlExists() function, if they were going to do this.
Still: bottom line is that it'll be handy for some people, so it's a good thing.
--
Adam
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What does it do with 30x responses?
Follows them.
Also, does it do a HEAD request, or a full GET? I presume it's the latter.
HEAD, although some servers treat that as a GET.
Wouldn't it be nice if Adobe kept their docs up to date? Surely if someone had a ticket raised to "add this functionality to fileExists()", there should have also been a ticket to "update the documentation for fileExists()".
I think this might have slipped in 9.0.1 with the support for Amazon
S3 (for example fileOpen("http://www.google.com/") does a couple of
head requests and then a GET request and then errors out with "Complex
object types cannot be converted to simple values.").
--
Mack
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I think this might have slipped in 9.0.1 with the support for Amazon
S3
Yeah, fair enough: that would make sense.
(for example fileOpen("http://www.google.com/") does a couple of
head requests and then a GET request and then errors out with "Complex
object types cannot be converted to simple values.").
Nice. Great feature that one.
--
Adam
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Add me to the tripple NO club.
fileExists("http://www.figleaf.com/"): NO
fileExists("http://www.figleaf.com/images/topbanner_products.jpg"): NO
fileExists("http://www.figleaf.com/images/bkbk_test.jpg"): NO
productversion 9,0,0,251028
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<!--- Head method is same as Get method, but here, server doesn't send back any response. We only need to check whether file exists --->
<cfhttp method="head" url="url_of_the_mp3_file">
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I reacted before seeing the last post.