Creates a new GMemoryInputStream with data in memory of a given size.
input data. [array length=len][element-type guint8][transfer full]
length of the data, may be -1 if data is a nul-terminated string
function that is called to free data, or NULL. [allow-none]
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new GMemoryInputStream with data in memory of a given size.