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Implement in Delphi 2010 (or compatible) a non-visual class called TTextFileConverter that can convert one or all of the following file formats to plain text:
* Microsoft Office .doc
* OpenOffice .odt
* .RTF file
* HTML files
By converting a file 'to plain text' I mean that the output of the process is a Delphi String that contains the text content without any formatting (except whitespace).
For example, if I would open up Microsoft Word, write a text document with a text 'Foobar 123' with the '123' in red font and 'Foobar' as a headline, save it as 'c:\foo.doc', calling TTextFileConverter's Function ReadFile('c:\foo.doc') would return a string 'Foobar 123'. You can modify the parameter list of the ReadFile function in order to return an error code in case the was an error in the analysis of the file.
Note: With your bid, please state whether your solution supports all the four file formats (.doc, .odt, .rtf and .html) or just some. If you can only provide a solution that supports e.g. .doc and .html, you may still place a bid but you must state this with your bid. I may not find a coder who can do all these four formats, so in that case I will consider other bids. Do not offer any solution that relies in other programming languages or the use of any DLL files or any proprietary code or libraries.