HtmlToXml Delphi DLL Reference Documentation
HtmlToXml
Current Version: 11.5.0
Chilkat.HtmlToXml
Convert real-world HTML into well-formed XML that can be loaded into
Supply HTML from strings, files, byte arrays,
Remove specific tag types from the output when the application wants a
cleaner XML result focused on relevant content.
Drop common formatting tags when the structure matters more than visual
presentation.
Control how non-breaking spaces are represented, converted, removed, or
preserved in the XML output.
Choose the XML charset and write the converted XML directly to a file
when a persisted result is needed.
For an extended overview, see
HtmlToXml Class Overview.
Convert HTML into well-formed XML for structured parsing and searching.
Chilkat.HtmlToXml converts HTML into well-formed XML so the
content can be parsed, searched, transformed, or processed programmatically
with XML tools. It can accept HTML from strings, files, byte arrays,
BinData, or StringBuilder, and provides options for
dropping selected tags, removing common text-formatting tags, controlling
non-breaking spaces, choosing the XML charset, and saving the converted XML
to a file.
HTML to XML conversion
Chilkat.Xml or other XML processing tools.
Flexible input sources
BinData, or
StringBuilder depending on how the content is received or
built.
Drop selected tags
Text-formatting cleanup
NBSP handling
Charset and file output
Nbsp behavior, and
XmlCharset, then call the conversion method and parse the result
as XML. Use HtmlToXml when structured extraction is needed; use
HtmlToText when the goal is readable plain text.
Create/Dispose
var myObject: HCkHtmlToXml; begin myObject := CkHtmlToXml_Create(); // ... CkHtmlToXml_Dispose(myObject); end;
Creates an instance of the HCkHtmlToXml object and returns a handle (i.e. a Pointer). The handle is passed in the 1st argument for the functions listed on this page.
Objects created by calling CkHtmlToXml_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function.
Properties
DebugLogFilePath
procedure CkHtmlToXml_putDebugLogFilePath(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;
function CkHtmlToXml__debugLogFilePath(objHandle: HCkHtmlToXml): PWideChar; stdcall;
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.
See the notes about PWideChar memory ownership and validity.
DropCustomTags
procedure CkHtmlToXml_putDropCustomTags(objHandle: HCkHtmlToXml; newPropVal: wordbool); stdcall;
Controls whether tags that Chilkat does not recognize as standard HTML elements are omitted from the generated XML.
True when custom or application-specific tags would add noise to the XML structure. Leave it False when those tags are meaningful to the application and should remain represented in the converted output.Html
procedure CkHtmlToXml_putHtml(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;
function CkHtmlToXml__html(objHandle: HCkHtmlToXml): PWideChar; stdcall;
The HTML source to be converted. Set this property to an HTML string, configure any conversion options, and then call ToXml, Xml, or ToXmlSb.
Assigning this property replaces the current in-memory HTML source. For file-to-file conversion, use ConvertFile. To load HTML from a file, BinData, or StringBuilder, use the corresponding SetHtml* method.
<text> elements to simplify programmatic extraction.See the notes about PWideChar memory ownership and validity.
topLastErrorHtml
function CkHtmlToXml__lastErrorHtml(objHandle: HCkHtmlToXml): PWideChar; stdcall;
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.
See the notes about PWideChar memory ownership and validity.
topLastErrorText
function CkHtmlToXml__lastErrorText(objHandle: HCkHtmlToXml): PWideChar; stdcall;
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.
See the notes about PWideChar memory ownership and validity.
LastErrorXml
function CkHtmlToXml__lastErrorXml(objHandle: HCkHtmlToXml): PWideChar; stdcall;
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.
See the notes about PWideChar memory ownership and validity.
topLastMethodSuccess
procedure CkHtmlToXml_putLastMethodSuccess(objHandle: HCkHtmlToXml; newPropVal: wordbool); stdcall;
Indicates the success or failure of the most recent method call: True means success, False 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. Note: This property does not apply to methods that return integer values or to boolean-returning methods where the boolean does not indicate success or failure.
Nbsp
procedure CkHtmlToXml_putNbsp(objHandle: HCkHtmlToXml; newPropVal: Integer); stdcall;
Controls how HTML non-breaking-space entities are handled during conversion. The default value is 0.
| Value | Behavior for |
|---|---|
0 | Convert to a normal space character (U+0020). |
1 | Convert to the numeric character reference   (U+00A0). |
2 | Drop the non-breaking-space entity. |
3 | Leave the entity unconverted by this option. |
This setting applies specifically to the HTML entity ; it does not define general whitespace normalization.
VerboseLogging
procedure CkHtmlToXml_putVerboseLogging(objHandle: HCkHtmlToXml; newPropVal: wordbool); stdcall;
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.
Version
function CkHtmlToXml__version(objHandle: HCkHtmlToXml): PWideChar; stdcall;
Version of the component/library, such as "10.1.0"
See the notes about PWideChar memory ownership and validity.
XmlCharset
procedure CkHtmlToXml_putXmlCharset(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;
function CkHtmlToXml__xmlCharset(objHandle: HCkHtmlToXml): PWideChar; stdcall;
Specifies the character encoding to identify for the generated XML, such as utf-8 or iso-8859-1. If this property is empty, Chilkat uses the character encoding of the HTML input. Otherwise, the converted XML uses the specified charset.
ToXml or Xml is a string in the programming language's native string representation, while the XML declaration reflects XmlCharset. When writing that string to a file, use the same charset so the file bytes agree with the XML declaration. ConvertFile performs the file conversion directly.See the notes about PWideChar memory ownership and validity.
topMethods
ConvertFile
inHtmlPath: PWideChar;
destXmlPath: PWideChar): wordbool; stdcall;
Converts the HTML file at inHtmlPath to a well-formed XML file at destXmlPath. The output encoding is controlled by XmlCharset; if XmlCharset is empty, Chilkat uses the HTML source encoding.
Returns True on success and False on failure.
Returns True for success, False for failure.
topDropTagType
tagName: PWideChar) stdcall;
Marks the specified HTML tag type to be dropped from the generated XML. To drop multiple tag types, call this method once for each tag name.
The setting remains in effect for subsequent conversions performed by this HtmlToXml object. Use UndropTagType to reverse the setting for a particular tag type.
DropTextFormattingTags
Configures the converter to drop common text-formatting tags from the generated XML. The affected tag names are:
b, font, i, u, br, center, em, strong, big, tt, s, small, strike, sub, and sup.
This is useful when the formatting markup is not relevant to later XML parsing and the application wants a simpler structural representation. Call UndropTextFormattingTags to keep these tags instead.
SetHtmlBd
Replaces the current HTML source with the complete contents of bd.
The data is copied from the supplied BinData object and becomes the input for a later call to ToXml, Xml, or ToXmlSb. Returns True on success and False on failure.
Returns True for success, False for failure.
SetHtmlFromFile
filename: PWideChar): wordbool; stdcall;
Loads HTML from filename and replaces the current Html input with the file contents.
Returns True on success and False if the file cannot be read or the HTML input cannot be loaded. Call ToXml, Xml, or ToXmlSb afterward to perform the conversion.
Returns True for success, False for failure.
topSetHtmlSb
Replaces the current HTML source with the complete contents of sb.
The text is copied from the supplied StringBuilder and becomes the input for a later call to ToXml, Xml, or ToXmlSb. Returns True on success and False on failure.
Returns True for success, False for failure.
topToXml
outStr: HCkString): wordbool; stdcall;
function CkHtmlToXml__toXml(objHandle: HCkHtmlToXml): PWideChar; stdcall;
Converts the current Html input to well-formed XML and returns the XML string. The generated XML uses the conversion settings currently configured on this object, including DropCustomTags, dropped tag types, Nbsp, and XmlCharset.
<text> elements to make extraction with XML tools straightforward.Returns True for success, False for failure.
See the notes about PWideChar memory ownership and validity.
ToXmlSb
Converts the current Html input to well-formed XML and appends the generated XML to sb.
Returns True on success and False on failure. Because the result is appended, clear the destination StringBuilder first when replacement rather than concatenation is desired.
Returns True for success, False for failure.
UndropTagType
tagName: PWideChar) stdcall;
Reverses a previous DropTagType setting for the specified tag name so that tag type is no longer intentionally dropped from subsequent XML output.
This affects only the named tag type. Other tag types previously configured to be dropped remain unchanged.
topUndropTextFormattingTags
Configures the converter to retain the common text-formatting tags that are otherwise dropped by default:
b, font, i, u, br, center, em, strong, big, tt, s, small, strike, sub, and sup.
Call DropTextFormattingTags to return to dropping these formatting tags.
Xml
outStr: HCkString): wordbool; stdcall;
function CkHtmlToXml__xml(objHandle: HCkHtmlToXml): PWideChar; stdcall;
Equivalent to ToXml. Converts the current Html input to well-formed XML and returns the XML string using the object's current conversion settings.
This method is provided as an alternate name for ToXml; it does not perform a different conversion.
Returns True for success, False for failure.
See the notes about PWideChar memory ownership and validity.
topDeprecated
ReadFile Deprecated
path: PWideChar;
outBytes: HCkByteData): wordbool; stdcall;
Reads the complete contents of path and returns the file data as bytes.
Returns True for success, False for failure.
topReadFileToString
filename: PWideChar;
srcCharset: PWideChar;
outStr: HCkString): wordbool; stdcall;
function CkHtmlToXml__readFileToString(objHandle: HCkHtmlToXml;
filename: PWideChar;
srcCharset: PWideChar): PWideChar; stdcall;
Reads the complete text file at filename and decodes its bytes using srcCharset, such as utf-8 or iso-8859-1. Returns the decoded text string.
Html property or perform a conversion.Returns True for success, False for failure.
See the notes about PWideChar memory ownership and validity.
topSetHtmlBytes Deprecated
Replaces the current HTML source with the contents of inData.
This method sets the input to be used by a later call to ToXml, Xml, or ToXmlSb; it does not perform the conversion itself.
WriteFile Deprecated
path: PWideChar;
fileData: HCkByteData): wordbool; stdcall;
Writes the bytes in fileData to path. Returns True on success and False on failure.
Returns True for success, False for failure.
topWriteStringToFile
stringToWrite: PWideChar;
filename: PWideChar;
charset: PWideChar): wordbool; stdcall;
Encodes stringToWrite using charset and writes the resulting text to filename. Typical charset names include utf-8 and iso-8859-1.
Returns True on success and False on failure.
ToXml, use a charset that agrees with the XML declaration, normally the same value configured in XmlCharset.Returns True for success, False for failure.
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