Author: Jonas Bilinkevicius

How do I set the left margin when printing the contents of a TRichEdit?

Answer:

You can set TRichEdit.PageRect for the margins. Get the printer information with 
GetDeviceCaps.

1   procedure TForm1.Button1Click(Sender: TObject);
2   var
3     PixelsX, PixelsY: integer;
4     LeftSpace, TopSpace: integer;
5     R: TRect;
6   begin
7     if PrintDialog1.Execute then
8     begin
9       {get pixels per inch}
10      PixelsX := GetDeviceCaps(Printer.Handle, LOGPIXELSX);
11      PixelsY := GetDeviceCaps(Printer.Handle, LOGPIXELSY);
12      {get non-printable margins}
13      LeftSpace := GetDeviceCaps(Printer.Handle, PHYSICALOFFSETX);
14      TopSpace := GetDeviceCaps(Printer.Handle, PHYSICALOFFSETY);
15      {1' margin all around}
16      R.Left := Round(PixelsX * 1) - LeftSpace;
17      R.Right := Round(PixelsX * 7.5) - LeftSpace;
18      R.Top := Round(PixelsY * 1) - TopSpace;
19      R.Bottom := Round(PixelsY * 10) - TopSpace;
20      RichEdit1.PageRect := R;
21      RichEdit1.Print('Test');
22    end;
23  end;