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Databases and tables

Remove CDX reference from table by rob444
Posted: 25 Oct 03

Sometimes it is easy to remove cdx references from tables by program.


*  nocdxref()
*  this function deletes the cdxref from any dbf.
*  usage:  lresult = nocdxref('C:\TABLES\MYTABLE.DBF')
*
function nocdxref
parameters rdfile
private filehandle, cdxbyte
rdfile = alltrim(rdfile)

if len(rdfile)=0
  return .f.
endif
filehandle=FOPEN(rdfile,12)     && Open the file

if filehandle < 0
  wait(rdfile+' NOT FOUND or IN USE')
  return .f.
endif  

=FSEEK(filehandle, 28,0)                   && Move pointer before 29th byte
cdxbyte =  asc(fgets(filehandle,1))        && read byte 29
if cdxbyte % 2 = 1                         && test if it has a cdx
     cdxbyte = cdxbyte - 1                 && if so change it
     =FSEEK(filehandle, -1,1)              && Move pointer before 29th byte again
     =FWRITE(filehandle, chr(cdxbyte), 1)  && write changed byte to dbfheader
endif
=FCLOSE(filehandle)
return .t.

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