Check IFS object existence
This program uses the CHKIN and CHKOUT commands to determine the existence of an object.
The need of objects that exist on the IFS increases daily, and along with those needs comes uncertain programmer...
Continue Reading This Article
Enjoy this article as well as all of our content, including E-Guides, news, tips and more.
headaches. Using CHKOBJ to determine the existence of an object is limited to HFS objects, and the ability to use that command on the IFS is non-existant. I happened to have read a similar tip where another programmer used an API to accomplish the task of determining whether an object existed on the IFS.
The excerpt below is a nice little program, which is limited to a 30 alpha string in this example, that uses the CHKIN and CHKOUT commands to determine the existence of an object. If the CHKOUT command is successful, then the object must be checked back in via the CHKIN to prevent object locks.
PGM PARM(&STMF &CODE) DCL VAR(&STMF) TYPE(*CHAR) LEN(30) DCL VAR(&CODE) TYPE(*CHAR) LEN(1) CHKOUT OBJ(&STMF) MONMSG MSGID(CPFA0A9) EXEC(CHGVAR VAR(&CODE) + VALUE('0')) /* NOT FOUND */ MONMSG MSGID(CPF0000) EXEC(DO) /* ANY OTHER ERROR + (IN USE) */ CHGVAR VAR(&CODE) VALUE('1') /* IT ALREADY EXISTS */ CHKIN OBJ(&STMF) /* RELEASE USE */ MONMSG MSGID(CPF0000) ENDDO ENDPGM
The Best Web Links: tips, tutorials and more.
Ask your programming questions--or help out your peers by answering them--in our live discussion forums.
Ask the Experts yourself: Our application development gurus are waiting to answer your programming questions.