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Printing bitmaps

Posted on 1997-03-11
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Last Modified: 2010-04-04
How can I draw a bitmaps to a printer and keep the same original bitmap-size on every printer, regardless of the points per pixel?
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Question by:royal031097
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Accepted Solution

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ed.eichman earned 200 total points
ID: 1334736
The following text is from the Delphi readme file MANUALS.TXT:

Using StretchDIBits instead of Draw for bitmap printing
-------------------------------------------------------
Bitmap printing - When printing a bitmap, make sure to use the
Windows API routine StretchDIBits. For example, here's a function
that prints an arbitrary TBitmap at the specified X,Y location:

  procedure PrintBitmap(Bitmap: TBitmap; X, Y: Integer);
  var
    Info: PBitmapInfo;
    InfoSize: Integer;
    Image: Pointer;
    ImageSize: Longint;
  begin
    with Bitmap do
    begin
      GetDIBSizes(Handle, InfoSize, ImageSize);
      Info := MemAlloc(InfoSize);
      try
        Image := MemAlloc(ImageSize);
        try
          GetDIB(Handle, Palette, Info^, Image^);
          with Info^.bmiHeader do
            StretchDIBits(Printer.Canvas.Handle, X, Y, Width,
              Height, 0, 0, biWidth, biHeight, Image, Info^,
              DIB_RGB_COLORS, SRCCOPY);
        finally
          FreeMem(Image, ImageSize);
        end;
      finally
        FreeMem(Info, InfoSize);
      end;
    end;
  end;

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