To read an Excel file

static void ExcelIoTest(Args _args)
{
    ExcelIo io;
    #Excel
    dialogField dialogFilename;
    Dialog dialog = new Dialog("Excel Upload");
    container con;
    ;
    dialogFilename = dialog.addField(typeId(FilenameOpen));
    dialog.filenameLookupTitle("Upload from Excel");
    dialog.filenameLookupFilter(["@SYS28576",#XLSX, "@SYS28576",#XLS]);
    if (!dialog.run())
        return;
    io = new ExcelIo(dialogFilename.value(), 'r');
    setprefix("Excel Import");
    while (io.status() == IO_Status::Ok)
    {
        con = io.read();
        info(con2str(con));
    }
    io.close(); //To quit Excel
}