Pointer Arrays — arrays of pointers to any type of data, which grow automatically as new elements are added
struct GPtrArray {
gpointer *pdata;
guint len;
};
Contains the public fields of a pointer array.
屬性：
gpointer pdata points to the array of pointers, which may be moved when the
guint len number of pointers in array
typedef void* gpointer;
An untyped pointer. gpointer looks better and is easier to use than void*.
