04
Mon, Nov
1 New Articles

TechTip: Create CL Commands from CL Program Source Code

CL
Typography
  • Smaller Small Medium Big Bigger
  • Default Helvetica Segoe Georgia Times
It is common for a CL program to submit a CALL command to a job queue for batch processing. That is, the programmer places a CALL command in the CMD parameter of the Submit Job (SBMJOB) command. Submitting a CALL command is risky because the command interpreter makes certain assumptions about parameter formats when loading and executing the called program. Numeric values are assumed to be 15-digit numbers with five decimal positions. Character values of 32 bytes or less in length are padded with trailing blanks to a length of 32. Trailing blanks are removed from character values longer than 32 bytes, potentially causing the submitted program to receive garbage in the rightmost part of a long character parameter.

Several methods exist to work around this problem, but my favorite by far is to write a CL command to run the program. I reference this command, rather than a CALL, in the CMD parameter of SBMJOB. While I occasionally see this method recommended in an online forum, I have found that many iSeries professionals have worked with the iSeries and/or AS/400 for years, yet have never written a command!

It is very easy to create command source code from CL program source code. Let me illustrate. Assume you have a CL program, CALLEDPGM, that is to be submitted to batch from another program, CALLER.

The first step is to provide a place to store command source code. You can use any source physical file you wish. For this illustration, I use a file called QCMDSRC, which is IBM's default name for command source. If necessary, create a source physical file.

CRTSRCPF MYLIB/QCMDSRC

Replace MYLIB with the name of one of your libraries.

Next, create a source physical file member to contain the command source. In this example, I use PDM and SEU because everybody has them and knows how to use them. From the Work with Members Using PDM panel, press F6 to create a new member. Name it CALLEDCMD and select CMD as the source member type. SEU creates an empty work member.

On the first line of the empty member, type CMD. Press F15 and enter CALLEDPGM and the name of the CL program's source file and library in the Browse/copy member entry fields. This permits you to view the CL program source as you build the command source code. At this point, you have a split display, with CALLEDCMD at the top and CALLEDPGM at the bottom.

Notice the PGM command that begins program CALLEDPGM. For this illustration, assume it looks like this:

PGM PARM(&COMPANY &WAREHOUSE &SHIPDATE &COMMENT)

There are four parameters, therefore your command will have four parameters. Copy the DCL statements for these four variables into the command source work member in the order in which they are listed on the PGM command. It is unlikely that any variable declaration has a VALUE parameter, since parameters receive their values from the caller, but if the VALUE parameter exists, remove it. The command source will look like this:

CMD
DCL VAR(&COMPANY) TYPE(*DEC) LEN(3) 
DCL VAR(&WAREHOUSE) TYPE(*CHAR) LEN(1) 
DCL VAR(&SHIPDATE) TYPE(*DEC) LEN(6) 
DCL VAR(&COMMENT) TYPE(*CHAR) LEN(40) 

You are finished with the CL program source code and can close the window in which it is displayed. SEU shows the DCL commands in reverse image because DCL is not valid in CL command source code. SEU also sends the error message "Command DCL not allowed in this setting." Use global search and replace operations to change DCL to PARM and VAR(& to an empty string. You can use SEU's CHANGE command for this purpose.

C DCL PARM A
C VAR(& '' A

Even after you make these changes, SEU is still not satisfied. Remove the closing parenthesis following each variable name and the reverse image should disappear from the PARM commands. The command source looks like this:

CMD 
PARM COMPANY TYPE(*DEC) LEN(3) 
PARM WAREHOUSE TYPE(*CHAR) LEN(1) 
PARM SHIPDATE TYPE(*DEC) LEN(6) 
PARM COMMENT TYPE(*CHAR) LEN(40)

This is barebones command source, inadequate as a user interface but sufficient for your purpose. Close and save the source member.

Use the Create Command (Create Command) command to build the command object.

CRTCMD CMD(MYLIB/CALLEDCMD)  +
       PGM(MYLIB/CALLEDPGM) +
       SRCFILE(MYLIB/QCMDSRC) +
       SRCMBR(CALLEDCMD)

Once the command has been created, you can use it in program CALLER.

SBMJOB     CMD(CALLEDCMD COMPANY(&COMP) WAREHOUSE(&WHS) + 
             SHIPDATE(&SDATE) COMMENT('URGENT')) +    
             JOB(MYJOB)

By submitting the command instead of CALL, OS/400 will format the parameters as they are defined in program CALLEDPGM.

For more information about creating your own CL commands, see Power CL, published by MC Press.

Paul Amsden has worked with AS/400 and iSeries systems for more than 10 years.

BLOG COMMENTS POWERED BY DISQUS

LATEST COMMENTS

Support MC Press Online

$

Book Reviews

Resource Center

  • SB Profound WC 5536 Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. You can find Part 1 here. In Part 2 of our free Node.js Webinar Series, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Brian will briefly discuss the different tools available, and demonstrate his preferred setup for Node development on IBM i or any platform. Attend this webinar to learn:

  • SB Profound WP 5539More than ever, there is a demand for IT to deliver innovation. Your IBM i has been an essential part of your business operations for years. However, your organization may struggle to maintain the current system and implement new projects. The thousands of customers we've worked with and surveyed state that expectations regarding the digital footprint and vision of the company are not aligned with the current IT environment.

  • SB HelpSystems ROBOT Generic IBM announced the E1080 servers using the latest Power10 processor in September 2021. The most powerful processor from IBM to date, Power10 is designed to handle the demands of doing business in today’s high-tech atmosphere, including running cloud applications, supporting big data, and managing AI workloads. But what does Power10 mean for your data center? In this recorded webinar, IBMers Dan Sundt and Dylan Boday join IBM Power Champion Tom Huntington for a discussion on why Power10 technology is the right strategic investment if you run IBM i, AIX, or Linux. In this action-packed hour, Tom will share trends from the IBM i and AIX user communities while Dan and Dylan dive into the tech specs for key hardware, including:

  • Magic MarkTRY the one package that solves all your document design and printing challenges on all your platforms. Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product. Make sure your data survives when catastrophe hits. Request your trial now!  Request Now.

  • SB HelpSystems ROBOT GenericForms of ransomware has been around for over 30 years, and with more and more organizations suffering attacks each year, it continues to endure. What has made ransomware such a durable threat and what is the best way to combat it? In order to prevent ransomware, organizations must first understand how it works.

  • SB HelpSystems ROBOT GenericIT security is a top priority for businesses around the world, but most IBM i pros don’t know where to begin—and most cybersecurity experts don’t know IBM i. In this session, Robin Tatam explores the business impact of lax IBM i security, the top vulnerabilities putting IBM i at risk, and the steps you can take to protect your organization. If you’re looking to avoid unexpected downtime or corrupted data, you don’t want to miss this session.

  • SB HelpSystems ROBOT GenericCan you trust all of your users all of the time? A typical end user receives 16 malicious emails each month, but only 17 percent of these phishing campaigns are reported to IT. Once an attack is underway, most organizations won’t discover the breach until six months later. A staggering amount of damage can occur in that time. Despite these risks, 93 percent of organizations are leaving their IBM i systems vulnerable to cybercrime. In this on-demand webinar, IBM i security experts Robin Tatam and Sandi Moore will reveal:

  • FORTRA Disaster protection is vital to every business. Yet, it often consists of patched together procedures that are prone to error. From automatic backups to data encryption to media management, Robot automates the routine (yet often complex) tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:

  • FORTRAManaging messages on your IBM i can be more than a full-time job if you have to do it manually. Messages need a response and resources must be monitored—often over multiple systems and across platforms. How can you be sure you won’t miss important system events? Automate your message center with the Robot Message Management Solution. Key features include:

  • FORTRAThe thought of printing, distributing, and storing iSeries reports manually may reduce you to tears. Paper and labor costs associated with report generation can spiral out of control. Mountains of paper threaten to swamp your files. Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing. Manage your reports with the Robot Report Management Solution. Key features include:

  • FORTRAFor over 30 years, Robot has been a leader in systems management for IBM i. With batch job creation and scheduling at its core, the Robot Job Scheduling Solution reduces the opportunity for human error and helps you maintain service levels, automating even the biggest, most complex runbooks. Manage your job schedule with the Robot Job Scheduling Solution. Key features include:

  • LANSA Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.

  • LANSAWhen it comes to creating your business applications, there are hundreds of coding platforms and programming languages to choose from. These options range from very complex traditional programming languages to Low-Code platforms where sometimes no traditional coding experience is needed. Download our whitepaper, The Power of Writing Code in a Low-Code Solution, and:

  • LANSASupply Chain is becoming increasingly complex and unpredictable. From raw materials for manufacturing to food supply chains, the journey from source to production to delivery to consumers is marred with inefficiencies, manual processes, shortages, recalls, counterfeits, and scandals. In this webinar, we discuss how:

  • The MC Resource Centers bring you the widest selection of white papers, trial software, and on-demand webcasts for you to choose from. >> Review the list of White Papers, Trial Software or On-Demand Webcast at the MC Press Resource Center. >> Add the items to yru Cart and complet he checkout process and submit

  • Profound Logic Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.

  • SB Profound WC 5536Join us for this hour-long webcast that will explore:

  • Fortra IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn: