wwUtils::SafeEval
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Evaluates a FoxPro expression without blowing up by wrapping the EVALUATE() operation into an internal TRY/CATCH block.

o.SafeEval(lcEvalString,lvErrorResult)

Parameters

lcEvalString
String to evaluate - same value you would pass to EVALUATE()

lvErrorDisplay
The value to return when an error occurs Pass the special value** ERRORMESSAGE** to return the error message

Remarks

You cannot pass expressions that contain local variables or the THIS pointer since they will not be in scope in the executing wrapper function.

Example

text
<<code lang="VFP">>*** Execute 2 + 2 on Error -1 would be returned lnResult = SafeEval("2+2",-1) *** return the error message in lnResult lnResult = SafeEval("2+2+A","ERRORMESSAGE") IF VARTYPE(lnResult) = "C" ? lnResult && Error Message ENDIF <</code>>

See also:

Class wwUtils

© West Wind Technologies, 2023 • Updated: 01/08/16
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