Hi, On Thu, 14 Sep 2006 14:34:57 -0700 Ian King <king@xxxxxxxxxx> wrote: >Our application is linked against gtk 2.4, however we would like to be >able to call functions from gtk 2.6 if they are available on the system >(for things such as text ellipsis rendering from pango). Can gmodule be >used for loading these functions and has anyone done this successfully? If the functions to be checked is in yet-not-loaded pluggable modules (e.g. pango-arabic-fc.so), g_module_symbol() will be useful. But, ellipsis issue is slightly different, because it is in libpango, and it is linked at once when the program is started. It's out of gmodule framework, so we don't have module object for libpango, as a result, g_module_symbol() cannot scan the symbols in libpango - I suppose. In the case of mozilla, to check the optional functions in FreeType, very complexed trick is used. See mozilla/gfx/src/freetype/nsFreeType.cpp. Yet I've not read their implementation, I guess the procedure is following. 1. get the full pathname of libfreetype.so (or .sl, .dll, .dylib etc) from preference. 2. execute dlopen() (or anything compatible) against the library and bind it to current process. the handle of (new) libfreetype.so is obtained. 3. execute dlsym() against the handle to lookup optional functions. I think similar technique is usable, but I'm really suspicious against its portability. Regards, mpsuzuki _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
