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type PluginLoader struct {
	...
}

///Call return type must be: (res,error)
func (p *PluginLoader) Call(funcName string, p0 ...interface{}) (interface{}, error)

//CallValue Allow any number of return values,return type: []reflect.Value,error
func (p *PluginLoader) CallValue(funcName string, p0 ...interface{}) ([]reflect.Value, error)

//MakeFunc point a func ptr to plugin
func (s *PluginLoader) MakeFunc(fptr interface{}, name string) error 


//20190419 new
//UnknownObject field 'V' MUST be valueof object type *struct{...}
//成员'V' 必须是结构体指针的 Value: *struct{...}
type UnknownObject struct {
	V reflect.Value
}
//NewUnknownObject parameter 'v' MUST be valueof object type *struct{...}
//参数'v' 必须是结构体指针的 Value: *struct{...}
func NewUnknownObject(v reflect.Value) *UnknownObject 

//Get 得到结构体成员的 Value
//get the value of a field
func (s *UnknownObject) Get(name string) reflect.Value

//Call 运行结构体的 method
//call the method of the struct
func (s *UnknownObject) Call(fn string, args ...interface{}) []reflect.Value

//Json 把结构体编码为 JSON。 convert the struct to JSON. if error,retur nil.
func (s *UnknownObject) Json() []byte

//CopyToStruct 利用 gob 编码技术把结构体的值复制到 v 中，v 必须是相似结构体的指针。 copy the value of the struct to v through gob encoding.
func (s *UnknownObject) CopyToStruct(v interface{}) error

import "github.com/rocket049/pluginloader"

p, err := pluginloader.NewPluginLoader( "path_to_plugin" )
if err != nil {
	panic(err)
}

res, err := p.Call("NameOfFunc", p0,p1,p3,...)
//...

ret := p.CallValue("NameOfFunc", p0,p1,p3,...)
//...

var Foo func(arg string)(string,error)
p.MakeFunc(&Foo,"Foo")
//call Foo(something)

// Use UnknownObject. NewFoo return 'foo *Foo'
v, err := p.CallValue("NewFoo")
if err != nil {
	t.Fatal(err)
}
obj := NewUnknownObject(v[0])

id: = obj.Get("Id").Int()

err = obj.Call("Set", nil)