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exception/error handling in rpg Dandridge, Tennessee

The basic logic of the program is as follows: Register the handler RPGHDLR using the subroutine RegHndlr. The next ON-ERROR traps for *FILE--that is, any file-related exception not already trapped with another ON-ERROR. Join Now For immediate help use Live now! If you pick the D(ump) or C(ancel) option then the procedure which first received the exception terminates and the function check is percolated to the caller.

Seems to me that USROPN combined with explicit allocation is still the best course. Again, an exception occurs and so processing of the *PSSR begins anew. The example consists of two procedures: RPGHDLR, which consists of a user-written condition handler for out-of-bound substring errors SHOWERR, which tests the RPGHDLR procedure. C DUMP c ROLBK C

The first two times * will get an error while the cancel handler is enabled. *----------------------------------------------------------------- C EVAL Count = Count + 1 C SELECT C WHEN Count = 1 C You would test the value of the DBFSTS or DSPSTS fields in the *PSSR to determine if the error was recoverable. So everything is OK, there is no need to tell anyone. The approach used here to avoid looping can also be used within an INFSR error subroutine.

To trap file open errors, you need to perform an implicit open of the file by specifying conditional open for the file (USROPN keyword on F Spec) and use the OPEN If PGM C has a *PSSR error subroutine coded, then in both OPM and ILE, the exception is handled by PGM C and the error subroutine is run. CL handles errors better, because, well, it's extremely easy to trap and handle errors in CL. handle all other errors EndMon; BegSR SubEx; Read Customer; If Not %EOF; Line1 = %SUBST(Line(i): %SCAN('***': Line(i)) + 1); EndIf; EndSR; Figure 4: Using a Monitor group to monitor code in

until the number of dump listings causes something to blow. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. If an error occurs that is not related to the operation (for example, an array-index error on a CHAIN operation), then any INFSR error subroutine would be ignored. There are five ways for you to indicate that RPG should handle an exception.

If an exception occurs while the subroutine is running, the subroutine is called again. All Rights Reserved. If the exception is not a function check, then the exception will be percolated. In one example, you code a GOTO and in the other you code a RETURN operation.

Lewis > > +--- > | This is the Midrange System Mailing List! > | To submit a new message, send your mail to [email protected] > | To subscribe to this This scenario has the following assumptions: There are two programs, PGM1 and PGM2, each containing a procedure, PRC1 and PRC2 respectively. The system returned: (22) Invalid argument The remote host or network may be down. Your cache administrator is webmaster.

Figure 134. D PR extPgm('QMHSNDPM') D messageID 7a const D messageFile 20a const D messageData 256a const D messageDataLength... You can obtain more information about the error which occurred by coding the appropriate data structures and querying the relevant data structure fields. The subroutine checks to determine if the exception was caused by a divide operation in which the divisor is zero.

EndMon;   Example Columns . . . :    6  80               Browse                                    AMITCC/QRPGLESRC SEU==>                                                                                 MONITORPG2 FMT H  HKeywords++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ *************** Beginning of data ******************************************************* 0001.00 HOPTION(*SRCSTMT) 0002.00 FCUST      UF A E             DISK    USROPN Finally, there are a few other points that you might want to consider. Example Columns . . . :    6  80             Edit                                     AMITCC/QRPGLESRC SEU==>                                                                             E_OP_EXTN4 FMT H  HKeywords++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ *************** Beginning of data **************************************************** 0001.00 HDftActGrp(*No) ActGrp('TEST1')                                                 130124 0002.00 DCALL1            PR                                                            130124 0003.00  *                                                                              130124 The code is followed by a set of ON-ERROR operations that indicate the error conditions that are being monitored along with the appropriate code to handle the error.

To perform this type of program exception handling prior to V5R1 would have taken a lot more effort. The basic logic of RPGHDLR is the following: Test to see if it is an out-of-bounds error by testing the message ID If it is, and if SHOWERR has indicated that Copyright © 1996-2014 Guild Companies, Inc. I think so, too.

If they are not satisfied, control passes immediately to the statement following the ENDMON statement of the MONITOR group. Want one of the many Linux jobs out there? In addition, it requires a definition for the error-prone array ARR1, and identification of the parameter lists used by the ILE bindable APIs CEEHDLR and CEEHDLU. If the exception is a function check, then an inquiry message will be displayed.

The error would be treated like any other program error. Tips on how to secure IoT devices, even the dumbest ones, so they can't be used as part of a DDoS botnet. All rights reserved. Fresche Legacy Automates DDS to DDL Conversions Vanguard IMS-21: Now with More Metadata Infor's CloudSuite for AWS: What it Means to IBM i Customers Profound Nabs Patent for Browser-Based Development Tool

But they do illustrate error handing. He is the author of Re-Engineering RPG Legacy Applications and is one of the quoted industry experts in the IBM Redbook "Who Knew You Could Do That With RPG IV?" Figure 124. Blanks Return control to the ILE RPG default exception handler.

The %STATUS BIF provides a five-digit status code that tells you what the error is. Call SubProc three times. *----------------------------------------------------------------- C CALLP SubProc C CALLP SubProc C CALLP SubProc C SETON LR *----------------------------------------------------------------- * Procedure SubProc. Just as the program has an error handling subroutine in *PSSR, each file that you define on an F spec can also have its own error handling subroutine, identified by the However it may be possible to use the STATUS code fields in the INFDS or SDS data structures to determine if the error is recoverable and design logic into your program

If a MONITOR block contains a call to a subprocedure, and the subprocedure has an error, the subprocedure's error handling will take precedence. If it remains unhandled, then the entry is removed and the function check is percolated.