This function is also included in the poppler lib used on the iLiad. It looks like the function searches for a string within a specific page of an opened PDF file. At least I found the following in the poppler sources (glib/test-poppler-lib.c):
Code:
list = poppler_page_find_text (page, "Bitwise");
printf ("\n");
printf ("\tFound text \"Bitwise\" at positions:\n");
So to search for a string globally we would have traverse all directories, open all PDF files, go through all pages and let the function do the rest...