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Printing in Delphi..

Posted on 2002-07-08
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Last Modified: 2010-04-04
Does anybody know or has an example on how to print something graphical in delphi? Please help me! TNX
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Question by:ssdjgru1
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2 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7137274
you've a canvas on the printer-object,
there you can draw your graphic as you need

meikl ;-)
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Cynna earned 200 total points
ID: 7137299
ssdjgru1,

If you have something drawn on a TPicture or TBitmap you can print it using following code (based on code posted on http://www.efg2.com/Lab/Library/Delphi/Printing/index.html):

COPY/PASTE:
----------------

procedure PrintBitmap(Bitmap:  TBitmap;
                      TopOfPagePercent, LeftMarginPercent, PrintedImageWidthPercent: Integer);
var
    BitmapHeader      :  pBitmapInfo;
    BitmapImage       :  POINTER;
    HeaderSize        :  DWORD;
    ImageSize         :  DWORD;
    FromLeftMargin    :  INTEGER;
    PrintedImageWidth :  INTEGER;
    FromTopOfPage     :  INTEGER;
    PrintedImageHeight:  INTEGER;

begin
 try
    Printer.BeginDoc; // Uses printers
    FromTopOfPage      := MulDiv(Printer.PageHeight, TopOfPagePercent  ,100);
    FromLeftMargin     := MulDiv(Printer.PageWidth , LeftMarginPercent ,100);
    PrintedImageWidth  := MulDiv(Printer.PageWidth , PrintedImageWidthPercent ,100);
    // Maintain aspect ratio
    PrintedImageHeight := Bitmap.Height*PrintedImageWidth div Bitmap.Width;
    GetDIBSizes(Bitmap.Handle, HeaderSize, ImageSize);
    GetMem(BitmapHeader, HeaderSize);
    GetMem(BitmapImage,  ImageSize);
    GetDIB(Bitmap.Handle, Bitmap.Palette, BitmapHeader^, BitmapImage^);
    StretchDIBits(Printer.Canvas.Handle,
                  FromLeftMargin, FromTopOfPage,          // Destination Origin
                  PrintedImageWidth, PrintedImageHeight,  // Destination Width & Height
                  0, 0,                                   // Source Origin
                  Bitmap.Width, Bitmap.Height,            // Source Width & Height
                  BitmapImage,
                  TBitmapInfo(BitmapHeader^),
                  DIB_RGB_COLORS,
                  SRCCOPY)
 finally
    FreeMem(BitmapHeader);
    FreeMem(BitmapImage);
    Printer.EndDoc;
 end;
end;




DEMO:
--------

(place Image1, Button1 on the form)

procedure TForm1.Button1Click(Sender: TObject);
begin
  Image1.Picture.LoadFromFile('C:\Program Files\Common Files\Borland Shared\Images\Splash\256Color\handshak.bmp');
  PrintBitmap(Image1.Picture.Bitmap, 1, 1, 80);
end;
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