Atom Lianja Reference Documentation

Atom

Deprecated To be removed in a future version, and should no longer be used.
Current Version: 10.1.2

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, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.

Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.

Possible causes of hangs include:

  • A timeout property set to 0, indicating an infinite timeout.
  • A hang occurring within an event callback in the application code.
  • An internal bug in the Chilkat code causing the hang.

More Information and Examples
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LastErrorHtml
LastErrorHtml As Character (read-only)

Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorText
LastErrorText As Character (read-only)

Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorXml
LastErrorXml As Character (read-only)

Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastMethodSuccess
LastMethodSuccess As Boolean

Indicates the success or failure of the most recent method call: .T. means success, .F. means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.

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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 "10.1.0"

More Information and Examples
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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.

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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LoadTaskCaller
LoadTaskCaller(task As CkTask) As Boolean
Introduced in version 9.5.0.80

Loads the caller of the task's async method.

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

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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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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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