loading image

asal · #1 10-May-2005, 15:10

i have recently started using fltk. i like to load an image into my window.however i get this liker error.
[Linker error] undefined reference to `fl_register_images()'
[Linker error] undefined reference to `Fl_JPEG_Image::Fl_JPEG_Image(char const*)'

here is a short version of my program:

CPP / C++ / C Code:

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_Box.H>

int main() {
    fl_register_images();                       // initialize image lib
    Fl_Window     win(720,486);                 // make a window
    Fl_Box        box(10,10,720-20,486-20);     // widget that will contain image
    Fl_JPEG_Image jpg("/MyPictures/tango.jpg");      // load jpeg image into ram
    box.image(jpg);                             // attach jpg image to box
    win.show();
    return(Fl::run());
}

cable_guy_67 · #2 11-May-2005, 07:11

Quote:

Originally Posted by asal

i have recently started using fltk. i like to load an image into my window.however i get this liker error.
[Linker error] undefined reference to `fl_register_images()'
[Linker error] undefined reference to `Fl_JPEG_Image::Fl_JPEG_Image(char const*)'

Hello and welcome asal. You just need one more switch to compile this:

Code:

g++ -Wall simple_image.cpp `fltk-config --ldflags --cxxflags --use-images` -s -o TestMain

Mark

asal · #3 11-May-2005, 08:14

thanks for your help. is there any way to add these in dev c++ instead of using cygwin?

cable_guy_67 · #4 11-May-2005, 08:31

Quote:

Originally Posted by asal

thanks for your help. is there any way to add these in dev c++ instead of using cygwin?

Hmmm, do you run fltk-config from dev-c++ somewhere with the --ld and --cxx flags (perhaps in the makefile) ? That would be the place to add it. If not, you will have to manually add the image libs to your linker in dev to take care of the problem.

Look at the --help stuff for fltk-config. What I usually do is something like this to find what I need from fltk-config.

Code:

Me@mycpu~
$ fltk-config --ldflags --cxxflags
-I/usr/local/include -I/usr/local/include/FL/images -mwindows -DWIN32
-L/usr/local/lib -mwindows -lfltk -lpthread -lole32 -luuid -lcomctl32 -lwsock32 -lsupc++

Me@mycpu~
$ fltk-config --use-images --ldflags --cxxflags
-I/usr/local/include -I/usr/local/include/FL/images -mwindows -DWIN32
-L/usr/local/lib -mwindows -lfltk_images -lfltk_png -lfltk_z -lfltk_jpeg -lfltk -lpthread -lole32 -luuid -lcomctl32 -lwsock32 -lsupc++

As you can see it shows what should be linked and you can use that info to add the libs to dev-c++. As you see from my example the libs change when adding the --use-images flag.

Hope this helps,

Mark

asal · #5 11-May-2005, 08:51

i added the libs manually and my project works. thank you so much.

lolo83120 · #6 24-Feb-2006, 12:43

Hi, I just start to program in C++. I also use dev C++ and fltk, and I would like to know how did u add the the libs manually and which libs, cause i d'on't know how to do it and my project doesn't work.
Thanks for ur answer.

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loading image

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