def write_string(row, col, str, format)
record = 0x0204
length = 0x0008 + str.length
xf_index = XF(row, col, format)
strlen = str.length
raise MaxSizeError if row >= RowMax
raise MaxSizeError if col >= ColMax
@dim_rowmin = row if row < @dim_rowmin
@dim_rowmax = row if row > @dim_rowmax
@dim_colmin = col if col < @dim_colmin
@dim_colmax = col if col > @dim_colmax
if strlen > StrMax
str = str[0..StrMax-1]
length = 0x0008 + StrMax
strlen = StrMax
end
header = [record, length].pack("vv")
data = [row, col, xf_index, strlen].pack("vvvv")
append(header, data, str)
end