Can I change the Paper size at runtime?

I want to change a Qreport from A3 to A4, How can I do that at runtime?

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ronvpConnect With a Mentor Commented:
To set the report paper size just do like this:
aReport.Page.PaperSize := A4
or back

aReport.Page.PaperSize := A3;

Note that when you change paper size that your controls may not always prinht correctly..

also here is a tip.. If you design reports in Landscape A4, and then change to Portrait A3, you will keep your report looking good and get more records on a page..

Switching from landscape to portrait is done like this:
aReport.Page.Orientation := poPortrait;

Before you switch from A4 to A3 from within your code, you may check if the printer actually supports A3 like this:

(function returns TRUE if the printer supports A3 or 11" x 17"

Function PrinterHasA3: Boolean;
var Device, Driver, Port: array[0..255] of char;
    ADevMode: THandle;
    Rslt: integer;
    i: integer;
    PN: Array of Word;
   Screen.Cursor := crHourGlass;
   Result := False;
   with Printer do
       GetPrinter(Device, Driver, Port, ADevMode);
   // Get the number of paper names
   Rslt := DeviceCapabilitiesA(Device, Port, DC_PAPERS, nil, nil);
   if Rslt > 0 then begin
     SetLength(PN, Rslt);
       // Retrieve the list of names into memory
       if DeviceCapabilitiesA(Device, Port, DC_PAPERS, Pointer(PN), nil) = - 1 then
          raise Exception.Create('Device capabilites error');
       // Check the paper names
       for i := 0 to Rslt - 1 do
          If (PN[i] = DMPAPER_11X17) or (PN[i] = DMPAPER_A3) then begin
             Result := True;
       PN := NIL;
  Screen.Cursor := crDefault;

kelvinyuAuthor Commented:

I have tried this method before, while complie the program ,it met a error message - "Undeclared Indentifier:'A4'"
Should I use some UNITs?

You must have QRPrntr in your uses clause..

kelvinyuAuthor Commented:
The Report Size can be changed now
Thanks you
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