void clearField(int fieldno);

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The function clearField() removes all data from a certain field and fills it with zeroes (0x00) or spaces (0x20).
You can call this function before calling setField(), setMemoBuf(). 


{
    // your code
    dbf.clearField(0);
    dbf.setField(0, "some value");
    dbf.writeField(row, 0);
    // your code
}
CDBFAPI, powerful library for working with dbf files