Atom Lianja Reference Documentation

Atom

Current Version: 9.5.0.75

Represents an Atom document. The Atom API allows one to download, create and modify Atom documents.

Object Creation

loObject = createobject("CkAtom")

Properties

AbortCurrent
AbortCurrent As Boolean (read-only)
Introduced in version 9.5.0.58

When set to .T., causes the currently running method to abort. Methods that always finish quickly (i.e.have no length file operations or network communications) are not affected. If no method is running, then this property is automatically reset to .F. when the next method is called. When the abort occurs, this property is reset to .F.. Both synchronous and asynchronous method calls can be aborted. (A synchronous method call could be aborted by setting this property from a separate thread.)

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DebugLogFilePath
DebugLogFilePath As Character

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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LastErrorHtml
LastErrorHtml As Character (read-only)

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
LastErrorText As Character (read-only)

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorXml
LastErrorXml As Character (read-only)

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
LastMethodSuccess As Boolean
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of .T. indicates success, a value of .F. indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = .T. and failure = .F..
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to .T.. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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NumEntries
NumEntries As Numeric (read-only)

Number of entries in the Atom document.

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VerboseLogging
VerboseLogging As Boolean

If set to .T., then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is .F.. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As Character (read-only)

Version of the component/library, such as "9.5.0.63"

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Methods

AddElement
AddElement(tag As Character, value As Character) As Numeric

Adds a new element to the Atom document. The tag is a string such as "title", "subtitle", "summary", etc. Returns the index of the element added, or -1 for failure.

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AddElementDateStr
AddElementDateStr(tag As Character, dateTimeStr As Character) As Numeric

Adds a new date-formatted element to the Atom document. The tag is a string such as "created", "modified", "issued", etc. The dateTimeStr should be an RFC822 formatted date/time string such as "Tue, 25 Sep 2012 12:25:32 -0500". Returns the index of the element added, or -1 for failure.

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AddElementDt
AddElementDt(tag As Character, dateTime As CkDateTime) As Numeric

Adds a new date-formatted element to the Atom document. The tag is a string such as "created", "modified", "issued", etc. Returns the index of the element added, or -1 for failure.

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AddElementHtml
AddElementHtml(tag As Character, htmlStr As Character) As Numeric

Adds a new HTML formatted element to the Atom document. Returns the index of the element added, or -1 for failure.

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AddElementXHtml
AddElementXHtml(tag As Character, xmlStr As Character) As Numeric

Adds a new XHTML formatted element to the Atom document. Returns the index of the element added, or -1 for failure.

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AddElementXml
AddElementXml(tag As Character, xmlStr As Character) As Numeric

Adds a new XML formatted element to the Atom document. Returns the index of the element added, or -1 for failure.

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AddEntry
AddEntry(xmlStr As Character)

Adds an "entry" Atom XML document to the caller's Atom document.

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AddLink
AddLink(rel As Character, href As Character, title As Character, typ As Character)

Adds a link to the Atom document.

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AddPerson
AddPerson(tag As Character, name As Character, uri As Character, email As Character)

Adds a person to the Atom document. The tag should be a string such as "author", "contributor", etc. If a piece of information is not known, an empty string or NULL value may be passed.

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DeleteElement
DeleteElement(tag As Character, index As Numeric)

Removes the Nth occurrence of a given element from the Atom document. Indexing begins at 0. For example, to remove the 2nd category, set tag = "category" and index = 1.

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DeleteElementAttr
DeleteElementAttr(tag As Character, index As Numeric, attrName As Character)

Remove an attribute from an element.The index should be 0 unless there are multiple elements having the same tag, in which case it selects the Nth occurrence based on the index ( 0 = first occurrence ).

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DeletePerson
DeletePerson(tag As Character, index As Numeric)

Deletes a person from the Atom document. The tag is a string such as "author". The index should be 0 unless there are multiple elements having the same tag, in which case it selects the Nth occurrence based on the index. For example, DeletePerson("author",2) deletes the 3rd author.

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DownloadAtom
DownloadAtom(url As Character) As Boolean

Download an Atom feed from the Internet and load it into the Atom object.

Returns .T. for success, .F. for failure.

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DownloadAtomAsync (1)
DownloadAtomAsync(url As Character) As CkTask

Creates an asynchronous task to call the DownloadAtom method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Returns .F. on failure

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GetElement
GetElement(tag As Character, index As Numeric) As Character

Returns the content of the Nth element having a specified tag.

Returns .F. on failure

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GetElementAttr
GetElementAttr(tag As Character, index As Numeric, attrName As Character) As Character

Returns the value of an element's attribute. The element is selected by the tag name and the index (the Nth element having a specific tag) and the attribute is selected by name.

Returns .F. on failure

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GetElementCount
GetElementCount(tag As Character) As Numeric

The number of elements having a specific tag.

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GetElementDateStr
GetElementDateStr(tag As Character, index As Numeric) As Character

Returns an element's value as a date/time in an RFC822 formatted string, such as such as "Tue, 25 Sep 2012 12:25:32 -0500".

Returns .F. on failure

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GetElementDt
GetElementDt(tag As Character, index As Numeric) As CkDateTime

Returns an element's value as a date/time object.

Returns .F. on failure

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GetEntry
GetEntry(index As Numeric) As CkAtom

Returns the Nth entry as an Atom object. (Indexing begins at 0)

Returns .F. on failure

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GetLinkHref
GetLinkHref(relName As Character) As Character

Returns the href attribute of the link having a specified "rel" attribute (such as "service.feed", "alternate", etc.).

Returns .F. on failure

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GetPersonInfo
GetPersonInfo(tag As Character, index As Numeric, tag2 As Character) As Character

Returns a piece of information about a person. To get the 2nd author's name, call GetPersonInfo("author",1,"name").

Returns .F. on failure

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GetTopAttr
GetTopAttr(attrName As Character) As Character

Returns the value of an attribute on the top-level XML node. The tag of a top-level Atom XML node is typically "feed" or "entry", and it might have attributes such as "xmlns" and "xml:lang".

Returns .F. on failure

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HasElement
HasElement(tag As Character) As Boolean

True (1) if the element exists in the Atom document. Otherwise 0.

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LoadXml
LoadXml(xmlStr As Character) As Boolean

Loads the Atom document from an XML string.

Returns .T. for success, .F. for failure.

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NewEntry
NewEntry()

Initializes the Atom document to be a new "entry".

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NewFeed
NewFeed()

Initializes the Atom document to be a new "feed".

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SaveLastError
SaveLastError(path As Character) As Boolean

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns .T. for success, .F. for failure.

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SetElementAttr
SetElementAttr(tag As Character, index As Numeric, attrName As Character, attrValue As Character)

Adds or replaces an attribute on an element.

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SetTopAttr
SetTopAttr(attrName As Character, value As Character)

Adds or replaces an attribute on the top-level XML node of the Atom document.

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ToXmlString
ToXmlString() As Character

Serializes the Atom document to an XML string.

Returns .F. on failure

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UpdateElement
UpdateElement(tag As Character, index As Numeric, value As Character)

Replaces the content of an element.

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UpdateElementDateStr
UpdateElementDateStr(tag As Character, index As Numeric, dateTimeStr As Character)

Replaces the content of a date-formatted element. The index should be an RFC822 formatted date/time string.

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UpdateElementDt
UpdateElementDt(tag As Character, index As Numeric, dateTime As CkDateTime)

Replaces the content of a date-formatted element.

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UpdateElementHtml
UpdateElementHtml(tag As Character, index As Numeric, htmlStr As Character)

Replaces the content of an HTML element.

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UpdateElementXHtml
UpdateElementXHtml(tag As Character, index As Numeric, xmlStr As Character)

Replaces the content of an XHTML element.

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UpdateElementXml
UpdateElementXml(tag As Character, index As Numeric, xmlStr As Character)

Replaces the content of an XML element.

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UpdatePerson
UpdatePerson(tag As Character, index As Numeric, name As Character, uri As Character, email As Character)

Replaces the content of a person. To update the 3rd author, call UpdatePerson("author",2,"new name","new URL","new email"). If a piece of information is not known, pass an empty string or a NULL.

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