Builds the GtkBuilder UI definition
in the file filename.
If there is an error opening the file or parsing the description then
the program will be aborted. You should only ever attempt to parse
user interface descriptions that are shipped as part of your program.
Builds the GtkBuilder UI definition in the file filename. If there is an error opening the file or parsing the description then the program will be aborted. You should only ever attempt to parse user interface descriptions that are shipped as part of your program.