Extract Text From Plain Text File Using Notebook

// This function shows how to extract each line of text from a plain text file using a notebook.
Function PrintTextFileContents()
    String nb = UniqueName("TempNB", 10, 0)
    OpenNotebook /N=$nb ""              // Display open file dialog
    DoWindow $nb                            // Check if notebook exists
    if (V_flag == 0)
        return -1                           // User canceled
    endif
    
    Notebook $nb, selection={startOfParagraph,endOfParagraph}
    do
        GetSelection Notebook, $nb, 2       // Sets S_selection to paragraph's text
        if (strlen(S_selection) == 0)
            break
        endif
        String text = S_selection
        text = ReplaceString("\r\n", text, "\r")        // Replace CRLF with CR
        text = ReplaceString("\n", text, "\r")          // Replace LF with CR
        Print strlen(text), text
        Notebook $nb, selection={startOfNextParagraph,endOfNextParagraph}
    while (1)
 
    DoWindow/K $nb
 
    return 0
End