The function clearRecord() removes all data from internal memory and fills it with zeroes (0x00) or spaces (0x20).
You can call this function before calling setField(), setMemoBuf().
{
// your code
dbf.clearRecord()
dbf.setField(0, asString:"some value", asDouble:0)
dbf.setField(1, asString:nil, asString:123.45)
dbf.appendRecord(false)
// your code
}