A call to BKCLOSE terminates file processing for the specified file.
CALL BKCLOSE (filenum,status)
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When processing is completed, a KSAM file should be closed with a call to BKCLOSE. No further processing is allowed on the file until a BKOPEN procedure call re-opens the file.
BKCLOSE can be executed only for a file that is open.
PARAMETERS |
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- filenum
A numeric variable containing the file number that identifies the file; this number was returned by the last call to BKOPEN. It should not be altered until the file is closed with a successfull call to BKCLOSE. (Required parameter)
- status
A four-character string variable to which is returned a code that indicates whether or not the file was successfully closed and if not, why not. The first character is set to "0" if the close is successful, to another value if not. (Refer to the Status Parameter discussion
earlier in this section.) (Required parameter)
USING BKCLOSE |
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After calling BKCLOSE, you should check the status parameter to determine if the file was closed successfully. A successfully closed file is no longer available for processing until it is re-opened. Note that a KSAM file can be closed and then re-opened in order to specify a different access mode or type of processing.
The BKCLOSE procedure does not remove the file from the system. To do this, you should use
the PURGE command of the KSAMUTIL program.
The example in Figure 6-1 “Closing a KSAM File with BKCLOSE”, closes a file identified by the filenumber in F. It then checks the status and prints a message if the status shows any code except the zero for successful completion.
Figure 6-1 Closing a KSAM File with BKCLOSE
3610 REM ********************************************************
3620 REM * CLOSE A KSAM FILE *
3630 REM ********************************************************
3640 REM
3650 REM F IS THE FILE NUMBER OF A KSAM FILE
3660 REM DEFINED BY A CALL TO BKOPEN
3670 REM
3680 CALL BKCLOSE(F,S$)
3690 REM
3700 REM NOW DETERMINE WHETHER THTS CALL SUCCEEDED
3710 REM
3720 IF S$[1,1]<>"0" THEN DO
3730 REM N$ CONTAINS THE NAME OF THE KSAM FILE
3740 REM S$ CONTAINS THE STATUS CODE SET BY THE PRECEDING CALL
3750 PRINT "UNABLE TO CLOSE ";N$;" ERROR ";S$[1;1];" DETAIL ";S$[2]
376O CALL BKERROR(S$,M$)
3770 PRINT M$
3780 DOEND
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