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Mr. Carsten Fuetterer

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

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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:

 

post-85-0-15039300-1503303904_thumb.png

 

To start we create a new feature definition:

 

post-85-0-77015200-1503304079_thumb.png

 

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

 

post-85-0-46379700-1503304316_thumb.png

 

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:

 

post-85-0-20593800-1503306529_thumb.png

 

The feature code looks like this:

 

post-85-0-48507700-1503306458_thumb.png

 

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:

post-85-0-07589800-1503306464_thumb.png

 

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

 

post-85-0-22296100-1503306470_thumb.png

 

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.

 

post-85-0-28079900-1503306477_thumb.png

 

Now we create the feature from the feature definition:

 

post-85-0-95433300-1503306124_thumb.png

 

 

We set the path to the reference file:

post-85-0-26076600-1503306842_thumb.png

 

 

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

post-85-0-24005500-1503306853_thumb.png

 

The final curve:

post-85-0-65761700-1503306617_thumb.png

 

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

 

best regards

 

Carsten

 

 

 

 

 

readTextFile.fdb

data.zip

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