Question

how can I read consecutive structures from a file, when they have different fields, and create for each of them the appropriate fields (title: value)? I am a beginner. I think it is about dynamic adding new fields while reading i-th structure and dynamic removing the fields from the i-1 structure, which remained empty after reading a structure i. But how am I able to do it not knowing the names of all the fields before? For this I couldn’t find example in documentation nor in the forum.

Thanks!

Answer 1

If some fields appear in every object, have them in a common structure that your array has instances of. For the variables fields, make a field “variable” or something in the main structure, and then dynamically assign field names and values within that structure. So for example, your structure might be:

a.name = 'Name1';
a.value = 'Value1';
a.variable.price = 50;


b.name = 'Name2';
b.value = 'Value2';
b.variable.year = 1996;

data(1) = a; data(2) = b;

where every object has fields “name” and “price” and object a has a price field but not a year field, and object b has a year field and no price field.

This will work for the kind of data you want to read in.