c_gdk_pixbuf_get_file_info_async

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(const(char)* filename, GCancellable* cancellable, GAsyncReadyCallback callback, void* userData) c_gdk_pixbuf_get_file_info_async;

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