How to see if str2Enum returns nothing

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Posted on by Community Member

If I call str2enum, e.g like this,

NoYes ny;
ny = str2enum(ny, 'badvalue');

what value will ny get? I can see in the debugger that it does not have Yes, not No. It is just blank. But I have not found a working way to identify this in a if clause.

(!ny) does not work

(ny==null) does not work

Any ideas?

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Community Member on at

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Hi Jonas,

Are your intentions to just see if an enum exists? If so use this global enum method instead of str2enum.

static void Job35(Args _args)
{

    NoYes ny;
    ;
    ny = enumName2Id("Baddy");

    if(ny > 0)
        info("Good enum");
    else
        info("Bad enum");

}

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somvir gahlawet 115 on at

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Try this:

static void Test(Args _args)
{
ABC abc;
str test;
    ;
   test = "A";
   if(str2Enum(abc,test) == ABC::A)
   {
     print "test";
     pause;

   }

}

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Denis Patrakov on at

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Usually all enum values have nonblank labels (if not then it's not good at all as you cannot use a blank enum label in a query range) so you can call enum2str(ny) and check if it returns a blank string. If it does then the enum variable definitely holds an invalid value. Internally in case of an incorrect conversion AX assigns a value of 255 to an enum variable (in MorphX a maximum enum value that you can use is 250) but this is kind of... undocumented so enum2str() is a preferable way to check if a preceding str2enum() call returned a valid enum value.

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Tommy Skaue Moderator on at

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So basically this works:

static void Adtest_enum(Args _args) { NoYesCombo n; ; if (!enum2str(str2Enum(n, 'bad'))) { info('bad enum'); } }

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