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unit unitmain;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, StdCtrls,
Buttons, Printers;
type
{ TForm1 }
TForm1 = class(TForm)
Button1: TButton;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
ListBox1: TListBox;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ private declarations }
procedure PrintString(S:String);
procedure PrintStream(St:TStream);
procedure PrintSample;
public
{ public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
{ TForm1 }
procedure TForm1.FormCreate(Sender: TObject);
begin
// fill in the printer list
Listbox1.Items.Assign(Printer.Printers);
end;
procedure TForm1.PrintString(S: String);
var
Written: Integer;
begin
Printer.Write(S[1], Length(S), Written);
end;
const
MaxBufSize = 256;
procedure TForm1.PrintStream(St: TStream);
var
Written: Integer;
Buffer: array[0..MaxBufSize-1] of byte;
begin
while St.Position<St.Size do begin
Written := St.Read(Buffer, MaxBufSize);
Printer.Write(Buffer, Written, Written);
end;
end;
procedure TForm1.PrintSample;
var
S: TStringStream;
begin
// print a plain string
PrintString('=== FIRST A STRING ==='+LineEnding);
PrintString(Memo1.Text);
PrintString('=== NOW USING A STREAM ==='+LineEnding);
// print using a stream
S := TStringStream.Create(Memo1.Text);
PrintStream(S);
S.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if Listbox1.ItemIndex<0 then begin
ShowMessage('Select a printer from the list');
exit;
end;
// on a freshly retrieved printer list, either method could
// be used to select a printer: SetPrinter or PrinterIndex
//Printer.PrinterIndex := Listbox1.ItemIndex;
Printer.SetPrinter(ListBox1.Items[Listbox1.ItemIndex]);
Printer.Title := Caption;
Printer.RawMode := True;
Printer.BeginDoc;
PrintSample;
Printer.EndDoc;
end;
end.
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