You need to learn how to output the coordinates of points from the .dxf file into a text file.

You need to output the coordinates of the points from the .dxf file to the text file in the following form:
flinttab
Nglass= 1.506
Xsize=50
Ysize=50
Zsize=50
1: 7968 -21312 0
1: 7964 -21310 1
1: 7961 -21309 0
1: 7966 -21311 0
1: 7986 -21315 3
1: 7983 -21315 6
1: 7980 -21314 9
1: 7978 -21314 12
1: 7975 -21314 14
1: 7972 -21313 17
1: 7968 -21312 19
1: 7964 -21310 20
1: 7960 -21308 18
1: 7959 -21307 15
1: 7958 -21305 12
1: 7957 -21304 9
1: 7957 -21303 6
1: 7956 -21302 2
1: 7957 -21301 0
1: 7962 -21303 0

It's a fragment of a file.
.dxf files for example at the link:
Tekst ukryty