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Printing

The VCL TPrinter object encapsulates details of Windows printers. To get a list of installed and available printers, use the Printers property. Both printer objects use a TCanvas (which is identical to the form's TCanvas) which means that anything that can be drawn on a form can be printed as well. To print an image, call the BeginDoc method followed by whatever canvas graphics you want to print (including text through the TextOut method) and send the job to the printer by calling the EndDoc method.

This example uses a button and a memo on a form. When the user clicks the button, the content of the memo is printed with a 200-pixel border around the page.

To run this example successfully, add Printers to your uses clause.

Copy Code

    procedure TForm1.Button1Click(Sender: TObject);
    var
    r: TRect;
    i: Integer;
    begin
    with Printer do
    begin
    r := Rect(200,200,(Pagewidth - 200),(PageHeight - 200));
    BeginDoc;
          Canvas.Brush.Style := bsClear;
    for i := 0 to Memo1.Lines.Count do
    Canvas.TextOut(200,200 + (i *
                       Canvas.TextHeight(Memo1.Lines.Strings[i])),
                       Memo1.Lines.Strings[i]);
    Canvas.Brush.Color := clBlack;
    Canvas.FrameRect(r);
    EndDoc;
    end;
    end;

Copy Code

    void __fastcall TForm1::Button1Click(TObject *Sender)
    {
    TPrinter *Prntr = Printer();
    TRect r = Rect(200,200,Prntr->PageWidth - 200,Prntr->PageHeight- 200);
    Prntr->BeginDoc();
    for( int i = 0; i < Memo1->Lines->Count; i++)
    Prntr->Canvas->TextOut(200,200 + (i *
      Prntr->Canvas->TextHeight(Memo1->Lines->Strings[i])),
      Memo1->Lines->Strings[i]);
    Prntr->Canvas->Brush->Color = clBlack;
    Prntr->Canvas->FrameRect(r);
    Prntr->EndDoc();
    }

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