Rss DataFlex Reference Documentation

Rss

Represents an RSS document or sub-part of a document such as a channel, image, or item. The RSS API allows one to download, create and modify RSS documents.

Object Creation

Handle hoRss
Get Create(RefClass(cComChilkatRss)) to hoRss

Properties

Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

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.

Function ComLastBinaryResult Returns Variant

Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

Function ComLastErrorHtml Returns String

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.

Function ComLastErrorText Returns String

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.

Function ComLastErrorXml Returns String

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.

Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value

Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False 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 = True and failure = False.
  • 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 True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

Function ComLastStringResult Returns String

Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

Long Strings Returned by ActiveX Methods in SQL Server

Function ComLastStringResultLen Returns Integer

Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

Function ComNumChannels Returns Integer

The number of channels in the RSS document.

Function ComNumItems Returns Integer

The number of items in the channel.

Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

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

Function ComVersion Returns String

Version of the component/library, such as "9.4.1.42"

Methods

Function ComAddNewChannel Returns cComChilkatRss

Adds a new channel to the RSS document. Returns the Rss object representing the Channel which can then be edited.

Function ComAddNewImage Returns cComChilkatRss

Adds a new image to the RSS document. Returns the Rss object representing the image, which can then be edited.

Function ComAddNewItem Returns cComChilkatRss

Adds a new Item to an Rss channel. Returns the Rss object representing the item which can then be edited.

Function ComDownloadRss String url Returns Boolean

Downloads an RSS document from the Internet and populates the Rss object with the contents.

Returns True for success, False for failure.

Example: Read RSS Feed

Function ComDownloadRssAsync String url Returns cComChilkatTask

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

How to Run an Asynchronous Task

Function ComGetAttr String tag String attrName Returns String

Returns the value of a sub-element attribute. For example, to get the value of the "isPermaLink" attribute of the "guid" sub-element, call item.GetAttr("guid","isPermaLink").

Returns True for success, False for failure.

Function ComGetChannel Integer index Returns cComChilkatRss

Returns the Nth channel of an RSS document. Usually there is only 1 channel per document, so the index argument should be set to 0.

Function ComGetCount String tag Returns Integer

Return the number of sub-elements with a specific tag.

Function ComGetDate String tag Returns DateTime

This method is deprecated. It will be removed in a future version.

Return the value of a sub-element in date/time format.

Returns True for success, False for failure.

Function ComGetDateStr String tag Returns String

The same as GetDate, except the date/time is returned in RFC822 string format.

Returns True for success, False for failure.

Function ComGetImage Returns cComChilkatRss

Return the image associated with the channel.

Function ComGetInt String tag Returns Integer

Return the value of a numeric sub-element as an integer.

Function ComGetItem Integer index Returns cComChilkatRss

Return the Nth item of a channel as an RSS object.

Function ComGetString String tag Returns String

Return the value of an sub-element as a string.

Returns True for success, False for failure.

Function ComLoadRssFile String filePath Returns Boolean

Load an RSS document from a file.

Returns True for success, False for failure.

Function ComLoadRssString String rssString Returns Boolean

Loads an RSS feed document from an in-memory string.

Returns True for success, False for failure.

Function ComMGetAttr String tag Integer index String attrName Returns String

Get an attribute value for the Nth sub-element having a specific tag. As an example, an RSS item may have several "category" sub-elements. To get the value of the "domain" attribute for the 3rd category, call MGetAttr("category",2,"domain").

Returns True for success, False for failure.

Function ComMGetString String tag Integer index Returns String

Get the value of the Nth occurance of a sub-element. Indexing begins at 0.

Returns True for success, False for failure.

Function ComMSetAttr String tag Integer idx String attrName String value Returns Boolean

Set an attribute on the Nth occurance of a sub-element.

Returns True for success, False for failure.

Function ComMSetString String tag Integer idx String value Returns Boolean

Set the value of the Nth occurance of a sub-element. Indexing begins at 0.

Returns True for success, False for failure.

Procedure ComNewRss

Clears the RSS document.

Procedure ComRemove String tag

Removes a sub-element from the RSS document.

Procedure ComSetAttr String tag String attrName String value

Sets the value of a sub-element attribute.

Procedure ComSetDate String tag DateTime dateTime

This method is deprecated. It will be removed in a future version.

Sets the value of a date/time sub-element.

Procedure ComSetDateNow String tag

Sets the value of a date/time sub-element to the current system date/time.

Procedure ComSetDateStr String tag String dateTimeStr

The same as SetDate, except the date/time is passed as an RFC822 string.

Procedure ComSetInt String tag Integer value

Sets the value of an integer sub-element.

Procedure ComSetString String tag String value

Sets the value of a sub-element.

Function ComToXmlString Returns String

Returns the RSS document as an XML string.

Returns True for success, False for failure.