Gst Parse Launch Properties

[iesx]

This is example i got from Internet 
......................................................................................................................................................
#!/usr/bin/python
import gobject; gobject.threads_init()
import pygst; pygst.require("0.10")
import gst

p = gst.parse_launch ("""videomixer name=mix ! ffmpegcolorspace !
xvimagesink
videotestsrc pattern="snow" ! video/x-raw-yuv, framerate=10/1, width=200,
height=150 ! mix.sink_0
videotestsrc ! video/x-raw-yuv, framerate=10/1, width=640, height=360 !
mix.sink_1
""")

m = p.get_by_name ("mix")
s0 = m.get_pad ("sink_0")
s0.set_property ("xpos", 100)

control = gst.Controller(s0, "ypos", "alpha")
control.set_interpolation_mode("ypos", gst.INTERPOLATE_LINEAR)
control.set_interpolation_mode("alpha", gst.INTERPOLATE_LINEAR)
control.set("ypos", 0, 0); control.set("ypos", 5 * gst.SECOND, 200)
control.set("alpha", 0, 0); control.set("alpha", 5 * gst.SECOND, 1.0)

p.set_state (gst.STATE_PLAYING)

gobject.MainLoop().run()
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i want to do almost same with the above example but i going to use C. 
Is there any method/way to do like that especially on " m = p.get_by_name
("mix") "?
what is the command line in C that same as get_by_name in python?
Thank You



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