$FunSkip: Difference between revisions
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{{DISPLAYTITLE:$FunSkip}} | {{DISPLAYTITLE:$FunSkip}} | ||
<span class="pageSubtitle">Skip to next output record for | <span class="pageSubtitle">Skip to next output record for $FunImg, $FunsStr</span> | ||
This skips the current | This skips the current <var class="product">[[Fast/Unload]]</var> output record for a request, so subsequent <var>[[$FunImg]]</var> and <var>[[$FunsStr]]</var> calls operate on the next record. | ||
The $FunSkip function accepts one argument and returns a numeric result. | The <var>$FunSkip</var> function accepts one argument and returns a numeric result. | ||
==Syntax== | ==Syntax== | ||
<p class="syntax">< | <p class="syntax"><span class="term">%result</span> = <span class="literal">$FunSkip</span>(<span class="term">req_num</span>)</p> | ||
< | |||
< | The only argument is the request identifier returned by <var>$FunLoad</var> for the request from which data is to be retrieved. This is a required argument. | ||
< | <p> | ||
< | <var class="term">%result</var> is set to either of these:</p> | ||
<p class="code"> | <ul> | ||
<li>1</li> | |||
<li>An error code, if there is no record to skip: | |||
<p class="code"> 1 — Record skipped | |||
0 — Fast/Unload completed with return code 0; no more data | |||
</p> | -1 — Request not found | ||
< | <-1 — Fast/Unload completed with non-zero return code, value | ||
</ | returned is negative of return code; no more data </p></li> | ||
</ul> | |||
If | ==Usage notes== | ||
<ul> | |||
<li>If <var class="product">Fast/Unload</var> has not unloaded any records yet, <var>$FunSkip</var> waits for the first record. If <var>$FunSkip</var> returns a value less than or equal to 0, the request has completed. </li> | |||
$FunSkips can be mixed with | <li><var>$FunSkips</var> can be mixed with <var>$FunsStr</var> and <var>$FunImg</var> calls for the same request. In addition, multiple unloads can be performed simultaneously with <var>$FunSkip</var> calls for the different requests mixed freely. </li> | ||
</ul> | |||
The following example compares the first two bytes of each unloaded record with | ==Example== | ||
<p class="code"> %REQ = $FunLoad('DATA', , , '*') | The following example compares the first two bytes of each unloaded record with <code>XX</code>. If they are equal, the record is copied into image <code>IMAGE</code> and then processed; otherwise the record is simply skipped. | ||
<p class="code">%REQ = $FunLoad('DATA', , , '*') | |||
IF %REQ LE 0 THEN | |||
STOP | |||
END IF | |||
%RC = 1 | |||
REPEAT WHILE %RC > 0 | |||
%TEST = $FunsStr( %REQ, 1, 2) | |||
IF %TEST EQ 'XX' THEN | |||
%RC = $FunImg( %REQ, %IMAGE:ITEM ) | |||
CALL PROCESS | |||
ELSE | |||
%RC = $FunSkip | |||
END IF | |||
END REPEAT | |||
</p> | </p> | ||
==Products authorizing {{PAGENAMEE}}== | |||
<ul class="smallAndTightList"> | <ul class="smallAndTightList"> | ||
<li>[[Fast/Unload | <li>[[Fast/Unload SOUL Interface]] | ||
</ul> | </ul> | ||
[[Category:$Functions|$FunSkip]] | [[Category:$Functions|$FunSkip]] | ||
[[Category:Fast/Unload | [[Category:Fast/Unload SOUL Interface]] | ||
Latest revision as of 20:17, 16 March 2015
Skip to next output record for $FunImg, $FunsStr
This skips the current Fast/Unload output record for a request, so subsequent $FunImg and $FunsStr calls operate on the next record.
The $FunSkip function accepts one argument and returns a numeric result.
Syntax
%result = $FunSkip(req_num)
The only argument is the request identifier returned by $FunLoad for the request from which data is to be retrieved. This is a required argument.
%result is set to either of these:
- 1
- An error code, if there is no record to skip:
1 — Record skipped 0 — Fast/Unload completed with return code 0; no more data -1 — Request not found <-1 — Fast/Unload completed with non-zero return code, value returned is negative of return code; no more data
Usage notes
- If Fast/Unload has not unloaded any records yet, $FunSkip waits for the first record. If $FunSkip returns a value less than or equal to 0, the request has completed.
- $FunSkips can be mixed with $FunsStr and $FunImg calls for the same request. In addition, multiple unloads can be performed simultaneously with $FunSkip calls for the different requests mixed freely.
Example
The following example compares the first two bytes of each unloaded record with XX. If they are equal, the record is copied into image IMAGE and then processed; otherwise the record is simply skipped.
%REQ = $FunLoad('DATA', , , '*') IF %REQ LE 0 THEN STOP END IF %RC = 1 REPEAT WHILE %RC > 0 %TEST = $FunsStr( %REQ, 1, 2) IF %TEST EQ 'XX' THEN %RC = $FunImg( %REQ, %IMAGE:ITEM ) CALL PROCESS ELSE %RC = $FunSkip END IF END REPEAT