CkRss Perl Reference Documentation

CkRss

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

$obj = chilkat::CkRss()->new();

Properties

# $strVal is a string
# $ckStr is a CkString
$rss->get_DebugLogFilePath($ckStr);
$strVal = $rss->debugLogFilePath();
$rss->put_DebugLogFilePath($strVal);

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.

# $strVal is a string
# $ckStr is a CkString
$rss->get_LastErrorHtml($ckStr);
$strVal = $rss->lastErrorHtml();

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.

# $strVal is a string
# $ckStr is a CkString
$rss->get_LastErrorText($ckStr);
$strVal = $rss->lastErrorText();

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.

Concept of LastErrorText

LastErrorText Standard Information

# $strVal is a string
# $ckStr is a CkString
$rss->get_LastErrorXml($ckStr);
$strVal = $rss->lastErrorXml();

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.

# $boolVal is a boolean
$boolVal = $rss->get_LastMethodSuccess();
$rss->put_LastMethodSuccess($boolVal);

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.

# $intVal is an integer
$intVal = $rss->get_NumChannels();

The number of channels in the RSS document.

# $intVal is an integer
$intVal = $rss->get_NumItems();

The number of items in the channel.

# $boolVal is a boolean
$boolVal = $rss->get_Utf8();
$rss->put_Utf8($boolVal);

When set to 1, all "const char *" arguments are interpreted as utf-8 strings. If set to 0 (the default), then "const char *" arguments are interpreted as ANSI strings. Also, when set to 1, and Chilkat method returning a "const char *" is returning the utf-8 representation. If set to 0, all "const char *" return values are ANSI strings.

# $boolVal is a boolean
$boolVal = $rss->get_VerboseLogging();
$rss->put_VerboseLogging($boolVal);

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.

# $strVal is a string
# $ckStr is a CkString
$rss->get_Version($ckStr);
$strVal = $rss->version();

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

Methods

# returns a CkRss
$ret_rss = $rss->AddNewChannel();

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

Returns null on failure

# returns a CkRss
$ret_rss = $rss->AddNewImage();

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

Returns null on failure

# returns a CkRss
$ret_rss = $rss->AddNewItem();

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

Returns null on failure

# $url is a string
$status = $rss->DownloadRss($url);

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

Returns 1 for success, 0 for failure.

Example: Read RSS Feed

# returns a CkTask
# $url is a string
$ret_task = $rss->DownloadRssAsync($url);

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

Returns null on failure

How to Run an Asynchronous Task

# $tag is a string
# $attrName is a string
# $outStr is a CkString (output)
$status = $rss->GetAttr($tag, $attrName, $outStr);
$retStr = $rss->getAttr($tag, $attrName);

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 1 for success, 0 for failure.

# returns a CkRss
# $index is an integer
$ret_rss = $rss->GetChannel($index);

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 null on failure

# $tag is a string
$retInt = $rss->GetCount($tag);

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

# $tag is a string
# $outStr is a CkString (output)
$status = $rss->GetDateStr($tag, $outStr);
$retStr = $rss->getDateStr($tag);

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

Returns 1 for success, 0 for failure.

# returns a CkRss
$ret_rss = $rss->GetImage();

Return the image associated with the channel.

Returns null on failure

# $tag is a string
$retInt = $rss->GetInt($tag);

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

# returns a CkRss
# $index is an integer
$ret_rss = $rss->GetItem($index);

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

Returns null on failure

# $tag is a string
# $outStr is a CkString (output)
$status = $rss->GetString($tag, $outStr);
$retStr = $rss->getString($tag);

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

Returns 1 for success, 0 for failure.

# $filePath is a string
$status = $rss->LoadRssFile($filePath);

Load an RSS document from a file.

Returns 1 for success, 0 for failure.

# $rssString is a string
$status = $rss->LoadRssString($rssString);

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

Returns 1 for success, 0 for failure.

# $tag is a string
# $index is an integer
# $attrName is a string
# $outStr is a CkString (output)
$status = $rss->MGetAttr($tag, $index, $attrName, $outStr);
$retStr = $rss->mGetAttr($tag, $index, $attrName);

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 1 for success, 0 for failure.

# $tag is a string
# $index is an integer
# $outStr is a CkString (output)
$status = $rss->MGetString($tag, $index, $outStr);
$retStr = $rss->mGetString($tag, $index);

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

Returns 1 for success, 0 for failure.

# $tag is a string
# $idx is an integer
# $attrName is a string
# $value is a string
$status = $rss->MSetAttr($tag, $idx, $attrName, $value);

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

Returns 1 for success, 0 for failure.

# $tag is a string
# $idx is an integer
# $value is a string
$status = $rss->MSetString($tag, $idx, $value);

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

Returns 1 for success, 0 for failure.

$rss->NewRss();

Clears the RSS document.

# $tag is a string
$rss->Remove($tag);

Removes a sub-element from the RSS document.

# $path is a string
$status = $rss->SaveLastError($path);

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

Returns 1 for success, 0 for failure.

# $tag is a string
# $attrName is a string
# $value is a string
$rss->SetAttr($tag, $attrName, $value);

Sets the value of a sub-element attribute.

# $tag is a string
$rss->SetDateNow($tag);

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

# $tag is a string
# $dateTimeStr is a string
$rss->SetDateStr($tag, $dateTimeStr);

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

# $tag is a string
# $value is an integer
$rss->SetInt($tag, $value);

Sets the value of an integer sub-element.

# $tag is a string
# $value is a string
$rss->SetString($tag, $value);

Sets the value of a sub-element.

# $outStr is a CkString (output)
$status = $rss->ToXmlString($outStr);
$retStr = $rss->toXmlString();

Returns the RSS document as an XML string.

Returns 1 for success, 0 for failure.