You can use command line tool ogr2ogr, e.g.:

$ ogr2ogr -where "OGR_GEOMETRY='POINT'" -f "ESRI Shapefile" my_out_file_points.shp my_in_file.dxf

OGR_GEOMETRY could be POINT, MULTIPOINT, LINESTRING, MULTILINESTRING, POLYGON, MULTIPOLYGON.

Reference:
http://www.gdal.org/ogr/ogr_sql.html


Best regards,
Karlis

Andreas Neumann wrote:
..
Unfortunately there is not proper DXF support currently for reading DXF
files. QGIS only allows one geometry type per data source. The OGR dxf
driver delivers multiple geometry types. QGIS just picks the first one
that OGR delivers (could be point, lines and polygons). There needs to
be some work done regarding the geometry types and the styling.
..
On Tue, Jun 19, 2012 at 6:01 AM, Philippe de FRANCLIEU wrote:

..
The geometry of a DXF file (french PCI-DXF) is defined as Polygon
in the metadata.
There are points and lines though. Which do not display...
Any hint? Should points and lines be extracted  to new files?
..
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