引言: 有Form,Image,Buttom Image已載入圖像並顯示出 如何按Buttom將圖像在印表機印出? 敬請指導 廣華敬上 khw

{1.}     uses 
  Printers;     procedure TForm1.Button1Click(Sender: TObject); 
var 
  ScaleX, ScaleY: Integer; 
  RR: TRect; 
begin 
  with Printer do 
  begin 
    BeginDoc; 
    // Mit BeginDoc wird ein Druckauftrag initiiert. 
    // The StartDoc function starts a print job. 
    try 
      ScaleX := GetDeviceCaps(Handle, logPixelsX) div PixelsPerInch; 
      ScaleY := GetDeviceCaps(Handle, logPixelsY) div PixelsPerInch; 
      // Informationen über die Auflösung 
      // Retrieves information about the Pixels per Inch of the Printer. 
      RR := Rect(0, 0, Image1.picture.Width * scaleX, Image1.Picture.Height * ScaleY); 
      Canvas.StretchDraw(RR, Image1.Picture.Graphic); 
      // An die Auflösung anpassen 
      // Stretch to fit         finally 
      EndDoc;   //Methode EndDoc beendet den aktuellen Druckauftrag und schließt die 
      // Textdatei-Variable. 
      // Steht in finally - um auch bei Abbruch des Druckauftrages Papierausgabe 
      // sicherzustellen 
    end; 
  end; 
end;     {2.} 
{************************************************************************}     // Based on posting to borland.public.delphi.winapi by Rodney E Geraghty, 8/8/97.     procedure PrintBitmap(Canvas: TCanvas; DestRect: TRect; Bitmap: TBitmap); 
var 
  BitmapHeader: pBitmapInfo; 
  BitmapImage: Pointer; 
  HeaderSize: DWORD; 
  ImageSize: DWORD; 
begin 
  GetDIBSizes(Bitmap.Handle, HeaderSize, ImageSize); 
  GetMem(BitmapHeader, HeaderSize); 
  GetMem(BitmapImage, ImageSize); 
  try 
    GetDIB(Bitmap.Handle, Bitmap.Palette, BitmapHeader^, BitmapImage^); 
    StretchDIBits(Canvas.Handle, 
      DestRect.Left, DestRect.Top,    // Destination Origin 
      DestRect.Right - DestRect.Left, // Destination Width 
      DestRect.Bottom - DestRect.Top, // Destination Height 
      0, 0,                           // Source Origin 
      Bitmap.Width, Bitmap.Height,    // Source Width & Height 
      BitmapImage, 
      TBitmapInfo(BitmapHeader^), 
      DIB_RGB_COLORS, 
      SRCCOPY) 
  finally 
    FreeMem(BitmapHeader); 
    FreeMem(BitmapImage) 
  end 
end {PrintBitmap};     {3.} 
{************************************************************************} 
// from www.experts-exchange.com     uses 
  printers;     procedure DrawImage(Canvas: TCanvas; DestRect: TRect; ABitmap: TBitmap); 
var 
  Header, Bits: Pointer; 
  HeaderSize: DWORD; 
  BitsSize: DWORD; 
begin 
  GetDIBSizes(ABitmap.Handle, HeaderSize, BitsSize); 
  Header := AllocMem(HeaderSize); 
  Bits := AllocMem(BitsSize); 
  try 
    GetDIB(ABitmap.Handle, ABitmap.Palette, Header^, Bits^); 
    StretchDIBits(Canvas.Handle, DestRect.Left, DestRect.Top, 
      DestRect.Right, DestRect.Bottom, 
      0, 0, ABitmap.Width, ABitmap.Height, Bits, TBitmapInfo(Header^), 
      DIB_RGB_COLORS, SRCCOPY); 
  finally 
    FreeMem(Header, HeaderSize); 
    FreeMem(Bits, BitsSize); 
  end; 
end;     procedure PrintImage(Image: TImage; ZoomPercent: Integer); 
  // if ZoomPercent=100, Image will be printed across the whole page 
var  
  relHeight, relWidth: integer; 
begin 
  Screen.Cursor := crHourglass; 
  Printer.BeginDoc; 
  with Image.Picture.Bitmap do  
  begin 
    if ((Width / Height) > (Printer.PageWidth / Printer.PageHeight)) then 
    begin 
      // Stretch Bitmap to width of PrinterPage 
      relWidth := Printer.PageWidth; 
      relHeight := MulDiv(Height, Printer.PageWidth, Width); 
    end  
    else 
    begin 
      // Stretch Bitmap to height of PrinterPage 
      relWidth  := MulDiv(Width, Printer.PageHeight, Height); 
      relHeight := Printer.PageHeight; 
    end; 
    relWidth := Round(relWidth * ZoomPercent / 100); 
    relHeight := Round(relHeight * ZoomPercent / 100); 
    DrawImage(Printer.Canvas, Rect(0, 0, relWidth, relHeight), Image.Picture.Bitmap); 
  end; 
  Printer.EndDoc; 
  Screen.cursor := crDefault; 
end;     // Example Call:     procedure TForm1.Button1Click(Sender: TObject); 
begin 
  // Print image at 40% zoom: 
  PrintImage(Image1, 40); 
end;