Type( <cMacroExpr> ) --> UI

[wanst...@gmail.com]

Hi, maybe it was already discussed here but I couldn't find it.

I am just trying to understand why these examples give different results:

? Type( 'str(1,5,2)' )       // C

? Type( 'strzero(1,5,2)' )   // UI

I just don't understand why...

[lai...@paysoft.com.br]

It look like strzero just check runtime. 

An alterinative is:

? ValType( &( 'strzero(1,5,2)' ) )

[Mario]

Hi Laiton,

Yes, it could be an alternative for certain situations but I was considering the use of Type() to determine the data type of a macro expression containing function calls by evaluating or executing it with the macro operator.

According to the documentation I found in my research, such functionality is restricted, however, to basic functions built into Harbour which operate on simple data types.
If the macro expression contains calls to complex functions or user-defined functions, Type() does not evaluate the macro expression and, thus, cannot determine the data type as in my example with StrZero().
My goal was to create a check for database related expressions to avoid any possible errors by the user input so Type() was a pretty good candidate and I will keep studying it and Valtype in combination with the & macro operator

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[lai...@paysoft.com.br]

Got it :D
Good lucky

[ivanil.m...@gmail.com]

?hb_isFunction("str")
?hb_isFunction("strzero")

Em quarta-feira, 14 de janeiro de 2026 às 00:55:11 UTC-3, Mario escreveu:

[José M. C. Quintas]

Not easy to make a valid test.

May be a workaround, not a solution, make your own tests:

FUNCTION TestMacro( cMacro )

   LOCAL xValue

   BEGIN SEQUENCE WITH __BreakBlock()

      xValue := &( cMacro )

   ENDSEQUENCE

   RETURN xValue

FUNCTION TestCompile( cMacro )

   LOCAL bCode, xValue

   bCode := hb_Compile( cMacro )

   IF bCode == Nil

      RETURN Nil

   ENDIF

   BEGIN SEQUENCE WITH __BreakBlock()

   xValue := Eval( bCode )

ENDSEQUENCE

RETURN xValue

José M. C. Quintas

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