Problem with Interfaces Unit

[cpalx]

Hi, use this units to create a PDF with. ¿Why it needs interfaces?

Code: Pascal  [Select][+][-]

1.   PdfDoc,
2.   PdfTypes,
3.   FPReadGif,
4.   PdfImages,
5.   FPimage,
6.   FPWriteJPEG,
7.   PdfJpegImage,
8.   PRJpegImage,
9.   PdfFonts,
10.   pack_powerpdf,

i need to use it in a cgi, but interfaces need GUI

Lazarus (1.84, FPC 3.04 ) both Windows (7, 19) and Linux (Ubuntu 18.04)

[lucamar]

My guess, and it's just that: a guess, is that some/any of those units depends on some widgetset-related unit for something, or contain a class descended from a widgetset class, like TControl, TCanvas, etc

interfaces seems to do nothing more than initialize/finalize the widgetset; if it's indeed needed it's more a symptom than the problem per se.

[cpalx]

the problem is

PRJpegImage



it use

Graphics, Controls, Forms, Dialogs,

[lucamar]

You can check if it really uses them or if they are a left-over--or were automagically added--and if so, comment them out. Although I suspect that if they are there, there must be a reason why. Bad luck.

[Thaddy]

You are mixing up interfaces as in language feature with interfaces as in co-operations.
This is not unusual, but they mean different things.
The English language is not expressive enough to solve this easily.

In this case it simply means you need it to talk to the OS and the widget set. Nothing to do with interface.

[PascalDragon]

He is talking about the Lazarus unit Interfaces.

[JuhaManninen]

the problem is
PRJpegImage

Where is PRJpegImage? It is not in Lazarus sources.
There are other choices for JPEG images. Maybe you should switch to another unit.

[Thaddy]

He is talking about the Lazarus unit Interfaces.

Which is what I tried to explain.

[cpalx]

Yes, there are others. Thanks, i solved the problem