doubt on usage of textview

["john" <johnson cyberbabies com>]

hi there,
     i displayed the hex dump of a file in the text view
using the following functions
buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (lblControl));
gtk_text_buffer_set_text (buffer, text,-1);


the display works perfectly

my doubt is
1.I want to highlight some of the characters in the textview using
different color or making it bold..all the characters with value FF have to
be highlighted..
2.I have to retrieve back the changed hex dump into the file...
  Please do guide me in this regard
thanks for help in advance
john




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