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Printing JPGs

Posted on 1998-07-31
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Last Modified: 2013-11-19
Hello...
I have to print a document which includes a picture. To save physical space I decided to use .JPG - Files everywhere instead of BitMaps. But when I'm trying to print a such JPG, i get exception with 'Graphic Format is not valid', but I made sure, that the JPEG-Unit (Delphi 3, prof) is loaded. It would be good if I could use JPGs, because the BMP File Size is about 240KB while the JPG is only 32KB. Please note, I'm only a young student, so I hope there is a way to get around this without the need of an expensive component.

Another Question is, is there a command like <Center> in HTML to Center Text/Images or do I have to mess with the Pixels ?

here the used code (in short version)

procedure TForm43.BitBtn3Click(Sender: TObject);

var
  BitMap : TBitMap;

begin
  if Printer.Printing then
    Application.MessageBox('Printer is actually busy', 'CompQuiz Print Error', 0)
  else
    begin
      Printer.Title := 'CompQuiz Statistics';
      Printer.BeginDoc;
      with Printer.Canvas do
        begin
          Font.Name := 'Arial';
          Font.Pitch := fpDefault;
          Font.Style := [fsItalic, fsBold];
          Font.Size := 30;
          Font.Color := clBlue; //my printer ran out of black cartridge
          TextOut(100, 100, 'Omsec CompQuiz32 v1.0 ALPHA');
          BitMap := TBitMap.Create;
          BitMap.LoadFromFile('c:\quiz\gb.jpg');
          Draw(100, 300, BitMap);
          BitMap.Free;
        end;
      Printer.EndDoc;
    end;
end;

Thanx for Help :)
0
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Question by:omsec
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4 Comments
 
LVL 2

Author Comment

by:omsec
ID: 1359302
btw, when I used "c:\quiz\gb2.bmp", same as the JPG instead it worked fine.
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LVL 4

Accepted Solution

by:
BoRiS earned 70 total points
ID: 1359303
omsec

replace this

var
      BitMap : TBitMap;

with this

var
    JPG: TJpgImage;

and this

          BitMap := TBitMap.Create;
              BitMap.LoadFromFile('c:\quiz\gb.jpg');

with this...

          JPG := TJpgImage.Create;
              JPG.LoadFromFile('c:\quiz\gb.jpg');

and finally this...

          Draw(100, 300, BitMap);
              BitMap.Free;

with this...

          Draw(100, 300, JPG);
              JPG.Free;

this should do it...

Later
BoRiS  
0
 
LVL 4

Expert Comment

by:BoRiS
ID: 1359304
omsec

sorry it should be

var
 JPG : TJpegImage;

not TJpgImage;

and

JPG := TJpegImage.Create;

not JPG := TJpgImage.Create;

Later
BoRiS
0
 
LVL 2

Expert Comment

by:kjteng
ID: 1359305
For your infomation, there are some FREEware for reading JPG file in the web. eg.

NViewlib.dll at http://einstein.ae.eng.ua.edu/nishita/index.htm 
is a dll that enable you to manupulate JPG, JIF, GIF, BMP, DIB, RLE, TGA, PCX.

Jpegimage at  WWW: http://www.westend.de/~hoerstemeier

checkout delphi super page for more.

Sound like advertisement? I have no dealing with the authors of these software or webpage :-))
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