g_variant_new G_TP_L G_TP_R

我觉得，首先你需要解构元组：

GVariant *inner; 
g_variant_get (ret, "(v)", &inner); 
然后分解一个元组：

guint32 num; 
gboolean b; 

g_variant_get (inner, "(ub)", &num, &b);