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[SOLVED] help me with glib programming

I'm adapting the code of gnome cheese to my program, but I encountered some difficulties since I'm new to glib programming.

I find in the file cheese-webcam.c a statement:

Code:

g_signal_connect (G_OBJECT (priv->photo_sink), "handoff",

                  G_CALLBACK  (cheese_webcam_photo_data_cb), webcam);

in the function cheese_webcam_take_photo and the prototype of cheese_webcam_photo_data_cb is:

Code:

static void

cheese_webcam_photo_data_cb (GstElement *element, GstBuffer *buffer,

                            GstPad *pad, CheeseWebcam *webcam);

My problem is that I want to make use of this function as a regular function rather than a callback while I don't know where is this GstBuffer *buffer from. I see that the function uses this buffer extensively.

How should I pass an argument to this parameter?

Thanks in advance.

Problem solved.

According to James, there is no way to pass this argument as what we ordinarily do. But when I want to call the function I just need to emit a "handoff" signal, the argument is automatically (and implicitly of course) passed by the library. That's all.

I just haven't got used to glib.

Thanks to James.