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EOF and BOF with Local Views
Message
De
16/02/2015 08:32:50
Lutz Scheffler
Lutz Scheffler Software Ingenieurbüro
Dresden, Allemagne
 
 
À
16/02/2015 08:29:34
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Versions des environnements
Visual FoxPro:
VFP 7 SP1
OS:
Windows 7
Network:
Windows 2008 Server
Database:
Visual FoxPro
Application:
Desktop
Divers
Thread ID:
01615325
Message ID:
01615381
Vues:
26
>>>>Can you use EOF and BOF commands with views. My code reads:
>>>>
>>>>sele v_vendors
>>>>
>>>>do case
>>>> case bof()
>>>> **do something with navigation button
>>>>
>>>> endcase
>>>>
>>>>But nother happens. I'm sure I'm sitting on the first record in the table so therefor shouldn't BOF = .T.?
>>>
>>>The use of BOF and EOF in Visual FoxPro is not entirely consistent (with one another). If you have 10 records in total, and go to the last record, EOF() will be .F., RECNO() will be 10; if you then SKIP, EOF() will be .T., and RECNO() will be 11. On the other hand, if you got to the first record, initially BOF() will be .F. and RECNO() will be 1 (fine with me, so far...). But if you then SKIP -1, BOF() will be .T., and RECNO() will still be 1.
>>>In any case, you can use EOF() and BOF() in combination with commands such as SKIP, LOCATE, SEEK(), ... to check whether you are still on a valid record. I believe the only command that will can set BOF() = .T., is a backwards SKIP.
>>
>>Kick in SET ORDER or the like and the BOF() might be on record 10 as well.
>>
>>Update:
>>FILTER
>>INDEX
>>ORDER
>>
>>That's what I remember out of the hip
>
>Yes, of course you are right. My example was for a table without order, without filter, and without deleted records (+ SET DELETED ON).

It was only to make clear to the OP that he will start an adventure.

I've never used SET KEY so I've learned something on this subject today.

Update:
SET DELETED is argh. There is an other way????
Words are given to man to enable him to conceal his true feelings.
Charles Maurice de Talleyrand-Périgord

Weeks of programming can save you hours of planning.

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