File I/O: How to read a file with a feature

[Mr. Carsten Fuetterer 9]

Hi,

 

if you want to read data from text or csv files it's fairly simple to do it in a feature definition.

 

We use a simple file like this:

 

 

To start we create a new feature definition:

 

 

In the "create function" tab, we can use the code templates to create a basic control structure:

 

 

The variable "FilePath" is not defined and has to be supplied with an argument. In this case I want the object "file" as an argument. So I comment the first line from the feature and create an new argument:

 

 

The feature code looks like this:

 

 

You can see that a string is  create for each line of the file. So now we have to split this string in order to access the double values. Therefor I use the split command, which has the output of an objectlist. Then I create a point, which accesses each value of that object list:

 

Now we have to store the points for each line inside an extra objectlist.Therefor we create a new list and add the point:

 

 

Finally we create fore example an bsplinecurve, with the new list of points. Additionally encapsulated the while loop into a persistent section in order to visualize the points for each loop. Otherwise we would just see the last point.

 

 

Now we create the feature from the feature definition:

 

 

 

We set the path to the reference file:

 

 

This nice dialog only appeared, because we didn't allow expressions for the argument inside the feature definition:

 

The final curve:

 

I hope this helps you to create you own custom file reader.

 

best regards

 

Carsten

 

 

 

 

 

readTextFile.fdb

data.zip