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[Arthur Clemens]

>>
>>
>> does crash the 2nd iteration. In both cases the fieldName is
>> @"slo_text" and @"nl_text". No other names.
>
> I do not understand.
>
> In above lines where it works only difference that you have wrap by 
> IF()
> that simply compare name ???
>
> May be that operation something change inside of fieldName  ?

Solved!

Silly me.

Converting:
display_fields = "slo_text, nl_text";
to an array of strings by using:
[self setDisplayFields:[displayFieldsString 
componentsSeparatedByString:@","]];
thereby creating "slo_text" and " nl_text" (note the space in the 
second string).
If you want to get the field value with
fblStr = cursor->GetString(" nl_text");
you get an error.

Still wondering about the curious error message though.

Arthur