WebReceive (XmlDoc function)
Deserialize Web request into this XmlDoc (XmlDoc class)
[Requires Janus SOAP]
WebReceive converts an HTTP request received on a Janus Web Server thread from the text representation of an XML document to an XmlDoc tree (this process is called deserialization, because the text representation of a document is called the serial form). It returns a zero value if the deserialization is successful; it returns a non-zero value if deserialization is unsuccessful and the ErrRet option is used and the particular error is tolerated.
Syntax
[%errorPosition =] doc:WebReceive[( [formFieldname], [fieldOccurrence], - [options])] Throws XmlParseError
Syntax terms
| %errorPosition | A %variable set to 0 if the deserialization is successful, or, if the ErrRet option is used, to the position within the uploaded data at which an error is found. |
|---|---|
| doc | An expression that points to the XmlDoc to contain the deserialized representation of the XML document. |
| formFieldName | The name of the form field associated with the "<input type=file>" tag in the HTML form, that is, the value of the "name" parameter in that tag. See the fieldname argument of $Web_Proc_Recv. |
| fieldOccurrence | The number of the form field associated with the "<input type=file>" tag in the HTML form. See the occurrence argument of $Web_Proc_Recv. |
| options | See the options argument of LoadXml. |
Exceptions
This function can throw the following exception:
- XmlParseError
- If the method encounters a parsing error, properties of the XMLParseError exception object may indicate the location and type of problem.
Usage notes
- See the LoadXml function.
Examples
The following Janus Web Server program uses WebReceive to obtain the XML document from the HTTP request:
begin %d object xmlDoc %d = new %d:webReceive %d2 object xmlDoc %d2 = new %d2:loadXml('<sum>' With - %d:value('/*/*[1]') + %d:value('/*/*[2]') with '</sum>') %d2:webSend end
Request-cancellation errors
This list is not exhaustive: it does not include all the errors that are request cancelling.
- The doc object is not EMPTY.
- An options argument is invalid.
- Insufficient free space exists in CCATEMP.
- A syntax error occurred in the text string representation of the XML document (these are tolerated if the ErrRet option is specified).
See also
- To deserialize a string, use LoadXml.
- The subroutine that serializes an XmlDoc and sends it as a Web response is WebSend.