How to Choose A4 or Letter paper

My Delphi application will be used (hopefully) anywhere in the world. I would like reports to automatically default to either Letter or A4 paper depending on what would normally be the correct default for the user's location.

In Delphi, how can I determine if Letter or A4 is the more sensible default for any given user?
plumothyAsked:
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Geert GruwezConnect With a Mentor Oracle dbaCommented:
this is some ancient code i found from my good old days
it gets the page size and density and converts it...

maybe you can find in here what you are lookin for
procedure TfrmCamGrid.PrintNewLayout(OnPrinter: Boolean; AStartPage: Integer; APrintPreviewForm: TFrmPrintPreview);
var BorderOffset: Integer;
  frm: TfrmPrintPreview;
  PhysicalPaperSize, Printing_Offset: TPoint;
  PageRect: TRect;
begin
  BorderOffset := 5;
  if Escape(Printer.Handle, GETPHYSPAGESIZE, 0, nil, @PhysicalPaperSize) <= 0 then
    MessageDlg('Internal error - cannot get physical paper size', mtError, [mbOK], 0);
  if Escape(Printer.Handle, GETPRINTINGOFFSET, 0, nil, @Printing_Offset) <= 0 then
    MessageDlg('Internal error - cannot get printing offset', mtError, [mbOK], 0);
  { *********************************************************** }
  { pixels per mm }
  if Printer.Orientation = poPortrait then
    mm_Pixel_Scale := PhysicalPaperSize.x / 210  { A4 }
  else
    mm_Pixel_Scale := PhysicalPaperSize.x / 297;
  { Distance in mm should be multiplied by this scale to get the corresponding number of pixels }
 
  ;
  ;
  PageRect := Rect(0, 0, Printer.PageWidth, Printer.PageHeight);
  if OnPrinter then
    PrintPageNew(Printer.Canvas, PageRect, OnPrinter, AStartPage)
  else
  begin
    if APrintPreviewForm = Nil then
    begin
      frm := TfrmPrintPreview.Create(Self, AStartPage, 0, PrintNewLayout, ChangeLayout, DoPrintFromPreview);
      try
        frm.imPreview.Width := Round(Printer.PageWidth / GetDeviceCaps(Printer.Handle, LOGPIXELSX) * PixelsPerInch)+5;
        frm.imPreview.Height := Round(Printer.PageHeight / GetDeviceCaps(Printer.Handle, LOGPIXELSY) * PixelsPerInch)+5;
        frm.imPreview.Picture.Bitmap.Width := Round(Printer.PageWidth / GetDeviceCaps(Printer.Handle, LOGPIXELSX) * PixelsPerInch);
        frm.imPreview.Picture.Bitmap.Height := Round(Printer.PageHeight / GetDeviceCaps(Printer.Handle, LOGPIXELSY) * PixelsPerInch);
        frm.Show;
        frm.Update;
        Application.ProcessMessages;
        frm.MaxPages := PrintPageNew(
          frm.imPreview.Picture.Bitmap.Canvas,
          Rect(
            BorderOffset,
            BorderOffset,
            frm.imPreview.Picture.Bitmap.Width-BorderOffset,
            frm.imPreview.Picture.Bitmap.Height-BorderOffset),
            False, AStartPage);
        frm.Hide;
        frm.Update;
        frm.ShowModal;
      finally
        frm.Free;
      end;
    end else
    begin
      frm := APrintPreviewForm;
      PrintPageNew(
        frm.imPreview.Picture.Bitmap.Canvas,
        Rect(
          BorderOffset,
          BorderOffset,
          frm.imPreview.Picture.Bitmap.Width-BorderOffset,
          frm.imPreview.Picture.Bitmap.Height-BorderOffset),
        False, AStartPage);
    end;
  end;
end;

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Geert GruwezOracle dbaCommented:
this is a setting of the printer,
not of the application
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plumothyAuthor Commented:
Yes, I realise that.

I want my application to be able to determine what paper size to use for its reports (perhaps by interrogating the default paper size on the default printer?), but I don't know how to do this.

Some countries prefer Letter paper, others prefer A4. If my application can make a sensible guess which one is best for the user so much the better.  My application will then generate print previews using the correct size - the user won't have to change it before clicking on Print.

So, I am after some code that will tell me "this user normally uses A4" or "this user normally uses Letter"
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Geert GruwezOracle dbaCommented:
you could ask the printer what it's current paper size is with
Printer.PageWidth  
and
Printer.PageHeight

generally what happens here is:
certain applications must print with certain settings like an invoice:
original : A4 color, drawer 1
copy 1 : A4 black/white, drawer 2
copy 2: A5 black/white, drawer 3

how to solve this :
create a printer driver for each setting and give each a unique name
in your application specify what type of document you want to send to what printer
that way you can define a printer for A4
and one for Letter and ...

This is usually done by the printer/network adminstrator
and gives a lot more flexibility


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Geert GruwezOracle dbaCommented:
some printer drivers have scaling built in so they can print an A3 document on a Letter paper ...
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mikelittlewoodCommented:
Personally I would have thought that this wouldnt matter.
If the usual default of the persons PC is Letter then it will just print Letter size, if its A4 then it will print to their default A4.

Why would you have to make a decision on this when really the decision should have already been made for you?
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plumothyAuthor Commented:
In portrait, Letter paper is wider than A4 paper.  In landscape, A4 is wider than Letter.

If my application did not know in advance which paper size to use (or the user does not tell it) then it would draw some items outside the printable area of the paper. To put a realistic print preview on the screen you need to know what the paper size is.

Not all printers can do scaling.

Printer.PageHeight and Printer.PageWidth are nearly right, but they are in pixels. The number of pixels across the page will vary with the resolution of the printer.

If there was a property like Printer.PageSize (eg A4, Letter, etc) that would be great, but there isn't.

I have seen some applications which assume the shorter dimensions of both Letter and A4 to ensure never printing outside the printable area. The downside of that is there is then always some of the paper that doesn't get used whichever physical size is in the printer.
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Geert GruwezOracle dbaCommented:
I got this new printer about a month ago.
It's a KODAK MP220 printer.
It's got a checkbox to "USE COMPLETE PAGE TO PRINT"
This overrides the setting for the border a printer can not print on
Just a setting on my printer, but probably other printer may have this setting too

It lets me print photos on the complete page without a white border.
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plumothyAuthor Commented:
Thanks Geert_Gruwez, I have been able to use the relevant parts of your code.
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plumothyAuthor Commented:
Many thanks.
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