HTMLToRTF (Function)

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Managing the character set

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HTMLToRTF (Function)

In french: HTMLVersRTF

Converts an HTML string or an HTML buffer into a string in RTF format. The following operations are performed during the conversion:

The HTML tags are deleted,
The special HTML characters are converted,
The CR characters (Carriage Return) are converted into space characters,
The multiple spaces are converted into unique spaces.

The formatting is kept "as best as possible".

Example

MyHTMLText is string = "'''''&quote;Hello!&quote;''"
Text is string = HTMLToRTF(MyHTMLText)
// Text is set to: "Hello"!

// If the HTML document is set to:
//<HTML>
// <HEAD>
// <TITLE>This is a test for a Web page</TITLE>
// <META http-equiv="content-type" content="text/html; charset=UTF-8">
// </HEAD>
//<BODY>
// <H2>This is an HTML page in English</H2>
// <A href="http://www.windev.com">This is a link</A>
// </BODY>
//</HTML>

Text = HTMLToRTF(MyHTMLText)
// Text will contain the RTF code corresponding to the following text:
// This is an HTML page in English.
//
// This is a link

Syntax

<Result> = HTMLToRTF(<Text in HTML format> [, <Charset used>])

<Result>: Character string

RTF text corresponding to the result of the HTML conversion. The encoding used is the one of the current character set of WINDEV or WEBDEV.

<Text in HTML format>: Character string or buffer (with quotes)

Text to convert.

<Charset used>: Optional Integer constant

Constant identifying the character set used to write the <Text in HTML Format>. The current character set of WINDEV or WEBDEV is used by default (charsetCurrent constant). If information about the character set used is found in the <Text in HTML Format>, this information has priority over this parameter.
See Correspondence between languages, sub-languages, character sets and nations for more details.

Remarks

Conversion rules

The HTML tags are analyzed in order to keep the best possible formatting in the output text (CR characters, space characters, tabulations). The formatting is kept as best as possible: bold, italic, colors, ...
Do not appear in the RTF output:
- the HTML tags
- the content of the "header" (information found in the <HEAD> tag)
- the comments
- the control texts
- the scripts
- the SSL definitions
- the CSS styles (except the "color" attributes)
Management of CR characters
- 2 CR characters are inserted to replace the following tags: <P>, <H1> to <H6>, <TABLE>, <UL> or <OL>
- 1 CR character is inserted to replace the following tags: <BR>, <TR>, <LI>, <DD> or <DIV>
- 1 single CR character is inserted if several identical tags (<TR>, <LI>, <DD> or <DIV>) are found one after another (except for <BR> tags)
Management of arrays
- A CR character is inserted for each array row (<TR> tag).
- A tabulation is inserted for each array column (<TD> tag).
Management of special characters
A special character is a character defined in the HTML standard. For example, a space character can be written as " ". This standard is automatically used.

Supported tags

The unsupported tags are ignored: their content is taken into account as text.

The supported tags are as follows:

<PRE>
<UL>: Line break + tabulation
<OL>: Line break + tabulation
<LI>: Tabulation
<H1>: Line break before and line break after, bold and size of the font applied
<H2>: Line break before and line break after, bold and size of the font applied
<H3>: Line break before and line break after, bold and size of the font applied
<H4>: Line break before and line break after, bold and size of the font applied
<H5>: Line break before and line break after, bold and size of the font applied
<H6>: Line break before and line break after, bold and size of the font applied
<P>: Line break before and line break after
<BR>: Line break
<B>: Bold
<STRONG>: Bold
<I>: Italics
<EM>: Italics
<FONT>: Size and color
<A HREF>: Hypertext link
<SPAN>: Style: Color
<DL>: Line break
<DT>: Line break
<DD>: Tabulation and line break
<TABLE>: Line break
<TR>: Line break
<TD>: Elements separated by a tabulation
<HEAD>: Content ignored, except for the parameters of the character set
<STYLE>: Content ignored
<SCRIPT&gt: Content ignored
: Comments ignored

Managing the character set

To find out the character set used in the HTML text, HTMLToRTF is using the information found in the CONTENT attribute of a <META> tag.

If this tag is not found, the character set used to write the HTML text must be specified in <Charset Used>.

Indeed, if the HTML content uses an Arabic character set while WINDEV/WEBDEV use a French character set by default, invalid characters will be found in the output text.

Remarks:

If the output text contains several "?" characters, it means that the character of the character set used in the HTML document cannot be expressed with a character of the current language.
The UTF8 character set is commonly used to encode the Web pages.

Related Examples:

Unit examples (WEBDEV): The HTMLTo functions

[ + ] This example explains how to use the HTMLToRTF and HTMLToText functions of WLanguage.

Component : wd250rtf.dll