Scodigo, Inc.

I have a couple questions, I do so appreciate your responses.
Why do you initialize the variable $result to EMPTY instead of " " on your web services example?

The other is I need to return two results on exit instead of one.
On the same web services example you have
Set Variable[$result]
Exit Script[Result:$result]

I need the error message from a PHP variable in case there is an error in the rest response so I want to return $result as well as $error.

I changed the above to
Set Variable[Result;$result]
Set Variable[Error;$error]
Exit script [Result; passParameter("result",$result) & PassParameter("error_message",$error)
I am getting the "result" returned but not the "error_message".

I am using the PassParameter custom function which has the "name" and "value" parameters from Six Fried Rice.

"<:" & Substitute( name; ["="; "/="]; [":"; "/:"] ; [">"; "/>"]; ["<" ; "/<"] ) & ":="
& Substitute( value; ["="; "/="]; [":"; "/:"] ; [">"; "/>"]; ["<" ; "/<"] ) & ":>"

I think it should all work once I can get an error message back as well as the result?
Best,
Janis

here is my code
define("ERROR", "Error");

//rest request to AWS Marketing Services

/*NOTE you must have a free apisigning account to correspond with your own Access Key or this script might not work
//You should add your MerchantID to the variable and uncomment the line????*/
$Access_Key = "AKIAIETJLADYILLAACBA";

// this expression will be used to get the contents of the ASIN field
$ASIN_expression= 'GetField ( "aws_marketing::ASIN")';

// now we use fm_evaluate to get the address
$Item_Id= fm_evaluate($ASIN_expression);
//$Item_Id = 'B000BUR1CY';
//$Item_Id = 'B000BUR1';

//ChangeMe
$allparameter =
//ASSOCIATE TAG
//MerchantId=
"Service" ."=". "AWSECommerceService" ."&".
"AWSAccessKeyId" ."=". $Access_Key ."&".
"Operation" ."=". "ItemLookup" ."&".
"IdType" ."-". "ASIN" ."&".
"ItemId" ."=". $Item_Id ."&".
"Version" ."=". "2009-01-06"
;

$request = file_get_contents("http://free.apisigning.com/onca/xml?".$allparameter);
$parsed_xml = simplexml_load_string($request);

if (strpos($request,ERROR) === false){
$result= $parsed_xml->Items->Item->ItemAttributes->ProductGroup;

$category= (string) $result;
echo $category;

}else{
$request=substr($request,strpos($request,'Errors', (strlen($request)-strpos($request,'Errors'))));

$error=$request;

}

This is a very useful plug-in.