All it does is provide an easyish way to read / write dxf files. You would still have to add all the autocad entities yourself e.g to add a line:

Qt Code: 
  1. dxf->writeLine(*dw,DL_LineData(p1x, p1y, p2x, p2y, lwidth),  DL_Attributes(layer, color, -1, "BYLAYER");
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Unfortunately it doesnt provide any magical conversions... But its definetly easier than creating a dxf from scratch.

RealDWG by Autodesk or DirectDWG by the Open Design Alliance are others. Also I think there are some other librarys which directly convert wmf's and SVG files to dxf files. I think Cadsoft make one.