toKeyFile  
  This function adds the page setup from @setup to @key_file.
Parameters
keyFile 
the GKeyFile to save the page setup to
groupName 
the group to add the settings to in @key_file, or null to use the default name “Page Setup”
This function adds the page setup from @setup to @key_file.
the GKeyFile to save the page setup to
the group to add the settings to in @key_file, or null to use the default name “Page Setup”