CkHtmlToXmlW Unicode C++ Reference Documentation

CkHtmlToXmlW

Current Version: 10.0.0

Requires Chilkat Bundle License

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

Object Creation

// Local variable on the stack
CkHtmlToXmlW obj;

// Dynamically allocate/delete
CkHtmlToXmlW *pObj = new CkHtmlToXmlW();
// ...
delete pObj;

Properties

DebugLogFilePath

void get_DebugLogFilePath(CkString &str);
const wchar_t *debugLogFilePath(void);
void put_DebugLogFilePath(const wchar_t *str);

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:

a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
there is an internal problem (bug) in the Chilkat code that causes the hang.

More Information and Examples

Example showing how to use DebugLogFilePath.

DropCustomTags

bool get_DropCustomTags(void);
void put_DropCustomTags(bool newVal);

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

Html

void get_Html(CkString &str);
const wchar_t *html(void);
void put_Html(const wchar_t *str);

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.

LastErrorHtml

void get_LastErrorHtml(CkString &str);
const wchar_t *lastErrorHtml(void);

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.

LastErrorText

void get_LastErrorText(CkString &str);
const wchar_t *lastErrorText(void);

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.

More Information and Examples

Concept of LastErrorText LastErrorText Standard Information

LastErrorXml

void get_LastErrorXml(CkString &str);
const wchar_t *lastErrorXml(void);

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.

LastMethodSuccess

bool get_LastMethodSuccess(void);
void put_LastMethodSuccess(bool newVal);

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.

Nbsp

int get_Nbsp(void);
void put_Nbsp(int newVal);

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.

VerboseLogging

bool get_VerboseLogging(void);
void put_VerboseLogging(bool newVal);

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

void get_Version(CkString &str);
const wchar_t *version(void);

Version of the component/library, such as "9.5.0.94"

More Information and Examples

How to get the Chilkat version at runtime.

XmlCharset

void get_XmlCharset(CkString &str);
const wchar_t *xmlCharset(void);
void put_XmlCharset(const wchar_t *str);

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

ConvertFile

bool ConvertFile(const wchar_t *inHtmlPath, const wchar_t *destXmlPath);

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.

DropTagType

void DropTagType(const wchar_t *tagName);

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.

DropTextFormattingTags

void DropTextFormattingTags(void);

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.

More Information and Examples

Drop/Undrop Text Formatting Tags

ReadFile

bool ReadFile(const wchar_t *path, CkByteData &outBytes);

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

Returns true for success, false for failure.

ReadFileToString

bool ReadFileToString(const wchar_t *filename, const wchar_t *srcCharset, CkString &outStr);
const wchar_t *readFileToString(const wchar_t *filename, const wchar_t *srcCharset);

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.

SetHtmlBd

bool SetHtmlBd(CkBinDataW &bd);

Introduced in version 9.5.0.77

Sets the Html property from the contents of bd.

Returns true for success, false for failure.

More Information and Examples

HTML Table to CSV

SetHtmlBytes

void SetHtmlBytes(CkByteData &inData);

Sets the Html property from a byte array.

SetHtmlFromFile

bool SetHtmlFromFile(const wchar_t *filename);

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

Returns true for success, false for failure.

SetHtmlSb

bool SetHtmlSb(CkStringBuilderW &sb);

Introduced in version 9.5.0.97

Sets the Html property from the contents of sb.

Returns true for success, false for failure.

ToXml

bool ToXml(CkString &outStr);
const wchar_t *toXml(void);

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

Returns true for success, false for failure.

More Information and Examples

Convert an HTML Table to Plain-Text

ToXmlSb

bool ToXmlSb(CkStringBuilderW &sb);

Introduced in version 9.5.0.77

Converts the HTML in the "Html" property to XML and appends the XML to sb.

Returns true for success, false for failure.

More Information and Examples

HTML Table to CSV

UndropTagType

void UndropTagType(const wchar_t *tagName);

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

UndropTextFormattingTags

void UndropTextFormattingTags(void);

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.

More Information and Examples

Drop/Undrop Text Formatting Tags

WriteFile

bool WriteFile(const wchar_t *path, CkByteData &fileData);

Convenience method for saving a byte array to a file.

Returns true for success, false for failure.

WriteStringToFile

bool WriteStringToFile(const wchar_t *stringToWrite, const wchar_t *filename, const wchar_t *charset);

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.

Xml

bool Xml(CkString &outStr);
const wchar_t *xml(void);

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.