HtmlToText Delphi DLL Reference Documentation

HtmlToText

HTML to plain-text conversion component. The internal conversion process is much more sophisticated than can be accomplished with the simple regular-expression freeware codes found in the Internet. This is more than simply removing HTML tags from an HTML document.

Create/Dispose

function CkHtmlToText_Create: HCkHtmlToText; stdcall;

Creates an instance of the HCkHtmlToText 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 CkHtmlToText_Dispose(handle: HCkHtmlToText); stdcall;

Objects created by calling CkHtmlToText_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function.

Properties

procedure CkHtmlToText_getDebugLogFilePath(objHandle: HCkHtmlToText; outPropVal: HCkString); stdcall;
procedure CkHtmlToText_putDebugLogFilePath(objHandle: HCkHtmlToText; newPropVal: PWideChar); stdcall;

function CkHtmlToText__debugLogFilePath(objHandle: HCkHtmlToText): 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 CkHtmlToText_getDecodeHtmlEntities(objHandle: HCkHtmlToText): wordbool; stdcall;
procedure CkHtmlToText_putDecodeHtmlEntities(objHandle: HCkHtmlToText; newPropVal: wordbool); stdcall;

If True, then HTML entities are automatically decoded. For example & is automatically decoded to &. If this property is set to False, then HTML entities are not decoded. The default value is True.

procedure CkHtmlToText_getLastErrorHtml(objHandle: HCkHtmlToText; outPropVal: HCkString); stdcall;

function CkHtmlToText__lastErrorHtml(objHandle: HCkHtmlToText): 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 CkHtmlToText_getLastErrorText(objHandle: HCkHtmlToText; outPropVal: HCkString); stdcall;

function CkHtmlToText__lastErrorText(objHandle: HCkHtmlToText): 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 CkHtmlToText_getLastErrorXml(objHandle: HCkHtmlToText; outPropVal: HCkString); stdcall;

function CkHtmlToText__lastErrorXml(objHandle: HCkHtmlToText): 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 CkHtmlToText_getLastMethodSuccess(objHandle: HCkHtmlToText): wordbool; stdcall;
procedure CkHtmlToText_putLastMethodSuccess(objHandle: HCkHtmlToText; 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 CkHtmlToText_getRightMargin(objHandle: HCkHtmlToText): Integer; stdcall;
procedure CkHtmlToText_putRightMargin(objHandle: HCkHtmlToText; newPropVal: Integer); stdcall;

Used to control wrapping of text. The default value is 80. When the text gets close to this margin, the converter will try to break the line at a SPACE character.

function CkHtmlToText_getSuppressLinks(objHandle: HCkHtmlToText): wordbool; stdcall;
procedure CkHtmlToText_putSuppressLinks(objHandle: HCkHtmlToText; newPropVal: wordbool); stdcall;

If True, then link URL's are preserved inline. For example, the following HTML fragment:

<p>Test <a href="http://www.chilkatsoft.com/">chilkat</a></p>

converts to:
Test chilkat <http://www.chilkatsoft.com/>
If this property is False, the above HTML would convert to:
Test chilkat
The default value of this property is True.

function CkHtmlToText_getVerboseLogging(objHandle: HCkHtmlToText): wordbool; stdcall;
procedure CkHtmlToText_putVerboseLogging(objHandle: HCkHtmlToText; 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 CkHtmlToText_getVersion(objHandle: HCkHtmlToText; outPropVal: HCkString); stdcall;

function CkHtmlToText__version(objHandle: HCkHtmlToText): PWideChar; stdcall;

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

Methods

function CkHtmlToText_IsUnlocked(objHandle: HCkHtmlToText): wordbool; stdcall;

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

function CkHtmlToText_ReadFileToString(objHandle: HCkHtmlToText;
    filename: PWideChar;
    srcCharset: PWideChar;
    outStr: HCkString): wordbool; stdcall;

function CkHtmlToText__readFileToString(objHandle: HCkHtmlToText;
    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 CkHtmlToText_SaveLastError(objHandle: HCkHtmlToText;
    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.

function CkHtmlToText_ToText(objHandle: HCkHtmlToText;
    html: PWideChar;
    outStr: HCkString): wordbool; stdcall;

function CkHtmlToText__toText(objHandle: HCkHtmlToText;
    html: PWideChar): PWideChar; stdcall;

Converts HTML to plain-text.

Returns True for success, False for failure.

function CkHtmlToText_UnlockComponent(objHandle: HCkHtmlToText;
    code: PWideChar): wordbool; stdcall;

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

This class is included with the Chilkat HTML-to-XML conversion component license.

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 CkHtmlToText_WriteStringToFile(objHandle: HCkHtmlToText;
    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.