HtmlToXml Delphi DLL Reference Documentation

HtmlToXml

Class for converting HTML to well-formed XML for the purpose of programmatically extracting (scraping) information from any HTML page.

Create/Dispose

function CkHtmlToXml_Create: HCkHtmlToXml; stdcall;

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.

procedure CkHtmlToXml_Dispose(handle: HCkHtmlToXml); stdcall;

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

procedure CkHtmlToXml_getDebugLogFilePath(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;
procedure CkHtmlToXml_putDebugLogFilePath(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;

function CkHtmlToXml__debugLogFilePath(objHandle: HCkHtmlToXml): PWideChar; stdcall;

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 CkHtmlToXml_getDropCustomTags(objHandle: HCkHtmlToXml): wordbool; stdcall;
procedure CkHtmlToXml_putDropCustomTags(objHandle: HCkHtmlToXml; newPropVal: wordbool); stdcall;

If set to true, then any non-standard HTML tags will be dropped when converting to XML.

procedure CkHtmlToXml_getHtml(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;
procedure CkHtmlToXml_putHtml(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;

function CkHtmlToXml__html(objHandle: HCkHtmlToXml): PWideChar; stdcall;

The HTML to be converted by the ToXml method. To convert HTML to XML, first set this property to the HTML string and then call ToXml. The ConvertFile method can do file-to-file conversions.

procedure CkHtmlToXml_getLastErrorHtml(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;

function CkHtmlToXml__lastErrorHtml(objHandle: HCkHtmlToXml): PWideChar; stdcall;

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.

procedure CkHtmlToXml_getLastErrorText(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;

function CkHtmlToXml__lastErrorText(objHandle: HCkHtmlToXml): PWideChar; stdcall;

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

procedure CkHtmlToXml_getLastErrorXml(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;

function CkHtmlToXml__lastErrorXml(objHandle: HCkHtmlToXml): PWideChar; stdcall;

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 CkHtmlToXml_getLastMethodSuccess(objHandle: HCkHtmlToXml): wordbool; stdcall;
procedure CkHtmlToXml_putLastMethodSuccess(objHandle: HCkHtmlToXml; newPropVal: wordbool); stdcall;

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 CkHtmlToXml_getNbsp(objHandle: HCkHtmlToXml): Integer; stdcall;
procedure CkHtmlToXml_putNbsp(objHandle: HCkHtmlToXml; newPropVal: Integer); stdcall;

Determines how to handle   HTML entities. The default value, 0 will cause   entites to be convert to normal space characters (ASCII value 32). If this property is set to 1, then  's will be converted to &#160. If set to 2, then &nbps;'s are dropped. If set to 3, then &nbsp's are left unmodified.

function CkHtmlToXml_getVerboseLogging(objHandle: HCkHtmlToXml): wordbool; stdcall;
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.

procedure CkHtmlToXml_getVersion(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;

function CkHtmlToXml__version(objHandle: HCkHtmlToXml): PWideChar; stdcall;

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

procedure CkHtmlToXml_getXmlCharset(objHandle: HCkHtmlToXml; outPropVal: HCkString); stdcall;
procedure CkHtmlToXml_putXmlCharset(objHandle: HCkHtmlToXml; newPropVal: PWideChar); stdcall;

function CkHtmlToXml__xmlCharset(objHandle: HCkHtmlToXml): PWideChar; stdcall;

The charset, such as "utf-8" or "iso-8859-1" of the XML to be created. If XmlCharset is empty, the XML is created in the same character encoding as the HTML. Otherwise the HTML is converted XML and converted to this charset.

Methods

function CkHtmlToXml_ConvertFile(objHandle: HCkHtmlToXml;
    inHtmlPath: PWideChar;
    destXmlPath: PWideChar): wordbool; stdcall;

Converts an HTML file to a well-formed XML file that can be parsed for the purpose of programmatically extracting information.

Returns True for success, False for failure.

procedure CkHtmlToXml_DropTagType(objHandle: HCkHtmlToXml;
    tagName: PWideChar) stdcall;

Allows for any specified tag to be dropped from the output XML. To drop more than one tag, call this method once for each tag type to be dropped.

procedure CkHtmlToXml_DropTextFormattingTags(objHandle: HCkHtmlToXml) stdcall;

Causes text formatting tags to be dropped from the XML output. Text formatting tags are: b, font, i, u, br, center, em, strong, big, tt, s, small, strike, sub, and sup.

function CkHtmlToXml_IsUnlocked(objHandle: HCkHtmlToXml): wordbool; stdcall;

Returns True if the component is already unlocked. Otherwise returns False.

function CkHtmlToXml_ReadFile(objHandle: HCkHtmlToXml;
    path: PWideChar;
    outBytes: HCkByteData): wordbool; stdcall;

Convenience method for reading a complete file into a byte array.

Returns True for success, False for failure.

function CkHtmlToXml_ReadFileToString(objHandle: HCkHtmlToXml;
    filename: PWideChar;
    srcCharset: PWideChar;
    outStr: HCkString): wordbool; stdcall;

function CkHtmlToXml__readFileToString(objHandle: HCkHtmlToXml;
    filename: PWideChar;
    srcCharset: PWideChar): PWideChar; stdcall;

Convenience method for reading a text file into a string. The character encoding of the text file is specified by srcCharset. Valid values, such as "iso-8895-1" or "utf-8" are listed at: List of Charsets.

Returns True for success, False for failure.

function CkHtmlToXml_SaveLastError(objHandle: HCkHtmlToXml;
    path: PWideChar): wordbool; stdcall;

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

Returns True for success, False for failure.

procedure CkHtmlToXml_SetHtmlBytes(objHandle: HCkHtmlToXml;
    inData: HCkByteData) stdcall;

Sets the Html property from a byte array.

function CkHtmlToXml_SetHtmlFromFile(objHandle: HCkHtmlToXml;
    filename: PWideChar): wordbool; stdcall;

Sets the Html property by loading the HTML from a file.

Returns True for success, False for failure.

function CkHtmlToXml_ToXml(objHandle: HCkHtmlToXml;
    outStr: HCkString): wordbool; stdcall;

function CkHtmlToXml__toXml(objHandle: HCkHtmlToXml): PWideChar; stdcall;

Converts the HTML in the "Html" property to XML and returns the XML string.

Returns True for success, False for failure.

Convert an HTML Table to Plain-Text

procedure CkHtmlToXml_UndropTagType(objHandle: HCkHtmlToXml;
    tagName: PWideChar) stdcall;

Causes a specified type of tag to NOT be dropped in the output XML.

procedure CkHtmlToXml_UndropTextFormattingTags(objHandle: HCkHtmlToXml) stdcall;

Causes text formatting tags to NOT be dropped from the XML output. Text formatting tags are: b, font, i, u, br, center, em, strong, big, tt, s, small, strike, sub, and sup.

Important: Text formatting tags are dropped by default. Call this method to prevent text formatting tags from being dropped.

function CkHtmlToXml_UnlockComponent(objHandle: HCkHtmlToXml;
    unlockCode: PWideChar): wordbool; stdcall;

Unlocks the component. An arbitrary unlock code may be passed to automatically begin a 30-day trial.

Returns True for success, False for failure.

Diagnosing UnlockComponent Problems

UnlockComponent LastErrorText shows exact string passed to it.

Verify UnlockComponent Success w/ Purchased Unlock Code

LastErrorText Standard Information

function CkHtmlToXml_WriteFile(objHandle: HCkHtmlToXml;
    path: PWideChar;
    fileData: HCkByteData): wordbool; stdcall;

Convenience method for saving a byte array to a file.

Returns True for success, False for failure.

function CkHtmlToXml_WriteStringToFile(objHandle: HCkHtmlToXml;
    stringToWrite: PWideChar;
    filename: PWideChar;
    charset: PWideChar): wordbool; stdcall;

Convenience method for saving a string to a file. The character encoding of the output text file is specified by charset (the string is converted to this charset when writing). Valid values, such as "iso-8895-1" or "utf-8" are listed at: List of Charsets.

Returns True for success, False for failure.

function CkHtmlToXml_Xml(objHandle: HCkHtmlToXml;
    outStr: HCkString): wordbool; stdcall;

function CkHtmlToXml__xml(objHandle: HCkHtmlToXml): PWideChar; stdcall;

This is the same as the "ToXml" method. It converts the HTML in the "Html" property to XML and returns the XML string.

Returns True for success, False for failure.