OpenEuphoria

1. Trouble wrapping a dll

• Posted by ChrisB (moderator) Aug 21, 2010
• 1275 views

Hi

I'm trying to wrap the ezwidgets library

All the C examples work as compiled,

My initial experiment to get the library wrapped is

include dll.e 
include get.e 
include misc.e 
include machine.e 
 
--open the library 
global atom EZ 
EZ = open_dll("libEZ.so") 
? EZ 
if EZ < 1 then  
        puts(1, "Library open failed!\n") 
        ? 1/0 
end if 
 
------------------------------------------------------------------------------ 
--EZ_Widget functions and procedures 
------------------------------------------------------------------------------ 
constant 
xEZ_Initialize = define_c_proc(EZ, "EZ_Initialize", {C_INT, C_POINTER, C_INT}), 
xEZ_Shutdown = define_c_proc(EZ, "EZ_Shutdown", {}) 
 
 
------------------------------------------------------------------------------ 
puts(1, "EZ_Initialize Handle value ") ? xEZ_Initialize 
global procedure EZ_Initialize(atom argc, sequence arguments, atom opengl) 
------------------------------------------------------------------------------ 
atom argv, VOID, pargv 
pargv = allocate_string(arguments) 
c_proc(xEZ_Initialize, {argc, pargv, opengl}) 
--c_proc(xEZ_Initialize, {argc, argv, opengl}) 
end procedure 
 
------------------------------------------------------------------------------ 
puts(1, "Shutdown handle ") ? xEZ_Shutdown 
global procedure EZ_Shutdown() 
------------------------------------------------------------------------------ 
c_proc(xEZ_Shutdown, {}) 
 
end procedure 
 
--initialize ezwidgets - checks wrapping 
EZ_Initialize(0, {}, 0) 
 
--create widgets 
 
--EZ_EventMainLoop() 
 
--EZ_Shutdown() 
 
-- this, run, produces 
-- 168318704 
-- EZ_Initialize Handle value 8 
-- Shutdown handle 9 
-- eui: symbol lookup error: /usr/lib/libEZ.so: undefined symbol: XrmInitialize 
-- Press any key to continue... 
 

As you can see, linking the lib and the functions produces some valid handles, but why is eui producing a symbol lookup error?

I have checked with ldd, and libEZ.so has no missing dependencies. XrmInitialize seems to be an X library function, called from within libEZ.

Any ideas anyone?

Chris

3. Re: Trouble wrapping a dll

• Posted by ChrisB (moderator) Aug 21, 2010
• 1265 views

Hi

nm on libEZ.so says that XrmInitialize is undefined ( 'U' in the type column)

adding an underscore to EZ_initialize produces a -1 Handle number

Chris

5. Re: Trouble wrapping a dll

• Posted by ChrisB (moderator) Aug 22, 2010
• 1212 views

Hi

Neither ld or ldd have a output-def command line option.

eui: symbol lookup error: /usr/lib/libEZ.so: undefined symbol: XrmInitialize

Can anyone tell me why eui is giving the symbol lookup error, when the program is not calling XrmInitialize, it is in libEZ.so that is calling it? Does eui have to link all the functions within the .so? If so, I have checked for the presence of XrmInitialise within libX11.so, and it is definitely there.

Chris

7. Re: Trouble wrapping a dll

• Posted by ChrisB (moderator) Aug 23, 2010
• 1149 views

Hi Matt got the library from here

http://www.ma.utexas.edu/users/mzou/EZWGL/

Built it myself, using stock xubuntu 8.(something), and the demos and examples, and installed as a shared library.

All the c examples and demos work.

Yes it is strange - and frustrating!

Of course, it could be the library, and the build setup, one idea would be for someone else to build it, email it to me, and see if it works (or doesn't) still. The other thing that I have thought of is that in some way the paths aren't correct for eui - I have put symlinks in the paths to see if that helps, but to no avail.

Chris

9. Re: Trouble wrapping a dll

• Posted by ChrisB (moderator) Aug 23, 2010
• 1098 views

Hi

Thanks for looking Matt.

Chris