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Article #17921: Changing the printer port in code.

 Question and Answer Database

FAQ2921D.txt   Changing the printer port in code.
Category   :Windows API
Platform    :All
Product    :All 32 bit  

Question:
How can I change the port a given printer will use in code?


Answer:
You can use the SetPrinter method of TPrinter to change the 
port. The following example demonstrates changing the port 
to print to a file.

Example:

uses Printers;

{$IFNDEF WIN32}
 const MAX_PATH = 144;
{$ENDIF}

procedure TForm1.Button1Click(Sender: TObject);
var
  pDevice : pChar;
  pDriver : pChar;
  pPort   : pChar;
  hDMode : THandle;
  PDMode : PDEVMODE;
begin
  if PrintDialog1.Execute then begin
    GetMem(pDevice, cchDeviceName);
    GetMem(pDriver, MAX_PATH);
    GetMem(pPort, MAX_PATH);
    Printer.GetPrinter(pDevice, pDriver, pPort, hDMode);
    Printer.SetPrinter(pDevice, PDriver, 'FILE:', hDMode);
    FreeMem(pDevice, cchDeviceName);
    FreeMem(pDriver, MAX_PATH);
    FreeMem(pPort, MAX_PATH);
    Printer.BeginDoc;
    Printer.Canvas.TextOut(100, 100, 'Delphi Is RAD!');
    Printer.EndDoc;
  end;
end;

7/16/98 4:31:28 PM
 

Last Modified: 01-SEP-99