将memo转化为JPG输出，使用Memo1.PaintTo(Bitmap.Canvas)

unit unit1;

interface

uses
  Windows, Messages, SysUtils, Graphics, Controls, Forms, StdCtrls,
  Classes;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;

procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
uses jpeg;
{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  vBitmap: TBitmap;
  vJpegImage: TJpegImage;
  vOldHeight: Integer;
begin
  Canvas.Font.Assign(Memo1.Font);
  vOldHeight := Memo1.Height;
  Memo1.ClientHeight := Canvas.TextHeight('|') * Memo1.Lines.Count + 2;
  vBitmap := TBitmap.Create;
  vJpegImage := TJpegImage.Create;
  try
    vBitmap.Height := Memo1.ClientHeight;
    vBitmap.Width := Memo1.ClientWidth;
    Memo1.PaintTo(vBitmap.Canvas, -2, -2);
    vJpegImage.Assign(vBitmap);
    vJpegImage.CompressionQuality := 75;
    vJpegImage.Compress;
    vJpegImage.SaveToFile('输出.jpg');
      //    Image1.Picture.Graphic   :=   vJpegImage;
  finally
    vBitmap.Free;
    Memo1.Height := vOldHeight;
  end;

end;

http://www.cnblogs.com/wxy8/archive/2011/01/13/1934477.html