How to convert a "text variable" to String with plugin

Hello,
I am currently developing a InDesign (CS5) plugin, where I need to manipulate text variable.
From the plugin I want to convert the "text variable" to string (in principle I should use the method "VariableToString (..)" of "ITextVariable")"
My problem is, how to find the text varial from its name (I think I should use the method "FindLocationsUsed(..)" of "ITextVariableSuite") and then convert it to String
I don't know how to use interfaces ITextVariable and ITextVariableSuite
Plugin implemented in C++ language
thank you

     InputStreamReader in=new InputStreamReader(fis);
      StringWriter out=new StringWriter();
      char[] buffer=new char[8192];
      int sizeRead;
      while ( ( sizeRead=in.read(buffer, 0, 8192) ) != -1 )
        out.write(buffer, 0, sizeRead);
     String content=out.toString();

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How to convert a "text variable" to String with plugin

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