Rss ActiveX Reference Documentation

Rss

Current Version: 9.5.0.75

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

(Visual Basic 6.0)
Dim obj As New ChilkatRss

(ASP)
set obj = Server.CreateObject("Chilkat_9_5_0.Rss")

(VBScript)
set obj = CreateObject("Chilkat_9_5_0.Rss")

(Delphi)
obj := TChilkatRss.Create(Self);

(FoxPro)
loObject = CreateObject('Chilkat_9_5_0.Rss')

(PowerBuilder)
lole_object = create oleobject
li_rc = lole_object.ConnectToNewObject("Chilkat_9_5_0.Rss")

(SQL Server)
EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Rss', @obj OUT

(Javascript)
var obj = new ActiveXObject("Chilkat_9_5_0.Rss");

Properties

DebugLogFilePath
DebugLogFilePath As String

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.

top
LastBinaryResult
LastBinaryResult As Variant (read-only)
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 1. 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).

top
LastErrorHtml
LastErrorHtml As String (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.

top
LastErrorText
LastErrorText As String (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.

top
LastErrorXml
LastErrorXml As String (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.

top
LastMethodSuccess
LastMethodSuccess As Long
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of 1 indicates success, a value of 0 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 = 1 and failure = 0.
  • 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 1. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

top
LastStringResult
LastStringResult As String (read-only)
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 1. 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).

top
LastStringResultLen
LastStringResultLen As Long (read-only)
Introduced in version 9.5.0.53

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

top
NumChannels
NumChannels As Long (read-only)

The number of channels in the RSS document.

top
NumItems
NumItems As Long (read-only)

The number of items in the channel.

top
VerboseLogging
VerboseLogging As Long

If set to 1, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is 0. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

top
Version
Version As String (read-only)

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

top

Methods

AddNewChannel
AddNewChannel() As ChilkatRss

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

Returns Nothing on failure

top
AddNewImage
AddNewImage() As ChilkatRss

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

Returns Nothing on failure

top
AddNewItem
AddNewItem() As ChilkatRss

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

Returns Nothing on failure

top
DownloadRss
DownloadRss(url As String) As Long

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

Returns 1 for success, 0 for failure.

top
DownloadRssAsync (1) (2) (Classic ASP) (Visual FoxPro) (PowerBuilder) (SQL Server) (Visual Basic 6.0) (VBScript)
DownloadRssAsync(url As String) As ChilkatTask

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

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

top
GetAttr
GetAttr(tag As String, attrName As String) As 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 Nothing on failure

top
GetChannel
GetChannel(ByVal index As Long) As ChilkatRss

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.

Returns Nothing on failure

top
GetCount
GetCount(tag As String) As Long

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

top
GetDateStr
GetDateStr(tag As String) As String

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

Returns Nothing on failure

top
GetImage
GetImage() As ChilkatRss

Return the image associated with the channel.

Returns Nothing on failure

top
GetInt
GetInt(tag As String) As Long

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

top
GetItem
GetItem(ByVal index As Long) As ChilkatRss

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

Returns Nothing on failure

top
GetString
GetString(tag As String) As String

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

Returns Nothing on failure

top
LoadRssFile
LoadRssFile(filePath As String) As Long

Load an RSS document from a file.

Returns 1 for success, 0 for failure.

top
LoadRssString
LoadRssString(rssString As String) As Long

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

Returns 1 for success, 0 for failure.

top
MGetAttr
MGetAttr(tag As String, ByVal index As Long, attrName As String) As 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 Nothing on failure

top
MGetString
MGetString(tag As String, ByVal index As Long) As String

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

Returns Nothing on failure

top
MSetAttr
MSetAttr(tag As String, ByVal idx As Long, attrName As String, value As String) As Long

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

Returns 1 for success, 0 for failure.

top
MSetString
MSetString(tag As String, ByVal idx As Long, value As String) As Long

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

Returns 1 for success, 0 for failure.

top
NewRss
NewRss()

Clears the RSS document.

top
Remove
Remove(tag As String)

Removes a sub-element from the RSS document.

top
SetAttr
SetAttr(tag As String, attrName As String, value As String)

Sets the value of a sub-element attribute.

top
SetDateNow
SetDateNow(tag As String)

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

top
SetDateStr
SetDateStr(tag As String, dateTimeStr As String)

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

top
SetInt
SetInt(tag As String, ByVal value As Long)

Sets the value of an integer sub-element.

top
SetString
SetString(tag As String, value As String)

Sets the value of a sub-element.

top
ToXmlString
ToXmlString() As String

Returns the RSS document as an XML string.

Returns Nothing on failure

top

Events

AbortCheck
AbortCheck(abort As Long)

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

VB6 Event callback implementation:

Important: Event callbacks from asynchronous method calls are generally not possible from the ActiveX. See VB6 Async Callbacks

Dim WithEvents myRss As ChilkatRss

Private Sub myRss_AbortCheck(abort As Long)

	'Insert application code here.

End Sub
top
PercentDone
PercentDone(ByVal pctDone As Long, abort As Long)

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to 1 will cause the method to abort and return a failed status (or whatever return value indicates failure).

VB6 Event callback implementation:

Important: Event callbacks from asynchronous method calls are generally not possible from the ActiveX. See VB6 Async Callbacks

Dim WithEvents myRss As ChilkatRss

Private Sub myRss_PercentDone(ByVal pctDone As Long, abort As Long)

	'Insert application code here.

End Sub
top
ProgressInfo
ProgressInfo(ByVal name As String, ByVal value As String)

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

VB6 Event callback implementation:

Important: Event callbacks from asynchronous method calls are generally not possible from the ActiveX. See VB6 Async Callbacks

Dim WithEvents myRss As ChilkatRss

Private Sub myRss_ProgressInfo(ByVal name As String, ByVal value As String)

	'Insert application code here.

End Sub
top