How to articles & tutorials: Gstreamer-1.0 error with GstElementFactory

When I tried the Basic tutorial 6: Media formats and Pad Capabilities of GStreamer, I found this error: Error invalid use of incomplete type 'GstElementFactory {aka struct _GstElementFactory}'.

I used GStreamer-1.0. I think it will be useful for someone with the same error.

// factory-> numpadtemplates: error invalid use of incomplete type 'GstElementFactory {aka struct _GstElementFactory}

/* Raise error
if (!factory->numpadtemplates) {
g_print (" none\n");
return;
}
*/

replace with this one:
gst_element_factory_get_num_pad_templates(factory)

pads = factory->staticpadtemplates // error

replace with this one:
pads = gst_element_factory_get_static_pad_templates (factory);

factory variable is in the method:
static void print_pad_templates_information (GstElementFactory * factory) {
...
}

Hope it help!