thanks for your answer. It was helpful in point 2 of my questions. Because the drawings are in a database, i solved the problem by storing needed drawings on harddisk.
On point 1 i am a little confused: Yes i work with dxf-files an i know that DXF is unitless format. In older version (6.0.., before the printdialog in cadimport.net) i
realized the printpreview and printout with a printform and a procedure pd_PrintPage wich handled the printpage-event of the printdocument (with the resize for inches
and mm) like described on other place in this forum (by Sergey). By receiving version 6.3 with the printpreview-dialog i thought the calculation for interpreting
measurements are done by this form.
For example: If i select fit to page, the drawing fits on page (calculation is done automaticly). As i see, my way to think was to simple.
Do you have a idea what i have misinterpreted (misunderstud) and what additional information do i have to set for using printpreview-dialog to make 1:1 printout of a dxf-file.