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107 lines
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<meta name="DC.Title" content="Use CL procedures" />
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<title>Use CL procedures</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Use CL procedures</h1>
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<div><p>This gives an overview of the types of operations performed using
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CL procedures</p>
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<div class="section"> <div class="p">In general, you can: <ul><li>Use variables, logic control commands, expressions, and built-in functions
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to manipulate and process data within a CL procedure: <pre>PGM
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DCL &C *LGL
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DCL &A *DEC VALUE(22)
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DCL &B *CHAR VALUE(ABCDE)
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•
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•
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•
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CHGVAR &A (&A + 30)
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•
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•
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•
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IF (&A < 50) THEN(CHGVAR &C '1')
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•
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DSPLIB ('Q' ∨∨ &B)
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•
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IF (%SST(&B 5 1)=E) THEN(CHGVAR &A 12)
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•
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•
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•
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ENDPGM</pre>
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</li>
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<li>Use a system value as a variable in a CL procedure. <br /><img src="rbafn551.gif" alt="Use a system value as a variable in a CL procedure." /><br /></li>
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<li>Use a job attribute as a variable in a CL procedure. <br /><img src="rbafn552.gif" alt="Use a job attribute as a variable in a CL procedure." /><br /></li>
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<li>Send and receive data to and from a display file with a CL procedure. <br /><img src="rbafn553.gif" alt="Send and receive data to and from a display file with a CL procedure." /><br /></li>
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<li>Create a CL procedure to monitor error messages for a job, and take corrective
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action if necessary. <pre> PGM
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MONMSG MSGID(CPF0001) EXEC(GOTO ERROR)
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CALL PROGA
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CALL PROGB
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RETURN
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ERROR: SNDPGMMSG MSG('A CALL command failed') MSGTYPE(*ESCAPE)
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ENDPGM</pre>
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</li>
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<li>Control processing among procedures and programs and pass parameters from
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a CL procedure to other procedures or programs to override files.</li>
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</ul>
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<br /><img src="rbafn554.gif" alt="Control processing among procedures and programs and pass parameters from a CL procedure to other procedures or programs to override files." /><br /></div>
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<p>Used as
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a controlling procedure, a CL procedure can call procedures written in other
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languages. The preceding illustration shows how control can be passed between
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a CL procedure and RPG IV* and ILE COBOL procedures in an application. To
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use the application, a workstation user would request program A, which controls
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the entire application. The illustration shows a single bound program (PGMA)
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that is called using the CALL command with PGMA. PGMA consists of: </p>
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<ul><li>A CL procedure (PGMA) calling an RPG IV procedure (PGMB)</li>
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<li>An RPG IV procedure (PGMB) calling another RPG IV procedure (PGMC)</li>
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<li>An RPG IV procedure (PGMB) calling a CL procedure (PGMD)</li>
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<li>A CL procedure (PGMA) calling an ILE COBOL procedure (PGME)</li>
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<li>An ILE COBOL procedure (PGME) calling a CL procedure (PGMF)</li>
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</ul>
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<br /><img src="rbafn502.gif" alt="The following illustration shows how control can be passed between a CL procedure and RPG IV* and ILE COBOL procedures in an application." /><br /><p>The procedures can be created
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as indicated in the following example. You can enter source for procedures
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in separate source members. </p>
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<pre> CRTCLMOD PGMA
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CRTRPGMOD PGMB
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CRTRPGMOD PGMC
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CRTCLMOD PGMD
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CRTCBLMOD PGME
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CRTCLMOD PGMF
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CRTPGM PGM(PGMA) +
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MODULE(PGMA PGMB PGMC PGMD PGME PGMF) +
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ENTMOD(*FIRST)</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="clpro.htm" title="This provides tasks and concepts specific to CL programming.">CL programming</a></div>
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</div>
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</div>
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