我在使用Golang追加到切片时遇到问题。Golang切片附加
这里是我的代码:
func MatchBeaconWithXY(w http.ResponseWriter, r *http.Request) ([]types.BeaconDataXY, error) {
context := appengine.NewContext(r)
returnBeaconData := []types.BeaconDataXY{}
beacondata, err := GetBeaconData(w, r)
if err != nil {
log.Errorf(context, "error getting beacondata %v", err)
w.WriteHeader(http.StatusInternalServerError)
return nil, err
}
for index, element := range beacondata {
q := datastore.NewQuery("physicalbeacondata").Filter("NamespaceID =", element.NamespaceID).Filter("InstanceID =", element.InstanceID)
beacondatastatic := []types.BeaconDataStatic{}
_, err := q.GetAll(context, &beacondatastatic)
if err != nil {
log.Errorf(context, "cant get query %v", err)
w.WriteHeader(http.StatusInternalServerError)
return nil, err
}
var beacondataXY = new(types.BeaconDataXY)
beacondataXY.NamespaceID = element.NamespaceID
beacondataXY.InstanceID = element.InstanceID
beacondataXY.XCoord = beacondatastatic[0].XCoord
beacondataXY.YCoord = beacondatastatic[0].YCoord
beacondataXY.Distance = element.Distance
returnBeaconData = append(returnBeaconData, beacondataXY...)
log.Infof(context, "beaondataXY tot %v", beacondataXY)
}
的beacondataxy.go包含此:
package types
type BeaconDataXY struct {
InstanceID string
NamespaceID string
XCoord float64
YCoord float64
Distance float64
}
的错误信息是这样的:
utils.go:139: cannot use beacondataXY (type *types.BeaconDataXY) as type []types.BeaconDataXY in append
我真的不知道如何处理Golang中的切片,即使阅读了一些使p版本的教程错误的感觉。我不确定我做错了什么。
我想有一个数组/切片里面的类型,返回BeaconData是[]类型。 BeaconDataXY,它应该包含单一类型的BeaconDataXY。
感谢您的帮助。
编辑:
现在的代码如下所示:
func MatchBeaconWithXY(w http.ResponseWriter, r *http.Request) ([]types.BeaconDataXY, error) {
context := appengine.NewContext(r)
//returnBeaconData := []types.BeaconDataXY{}
returnBeaconData := make([]types.BeaconDataXY, 1)
beacondata, err := GetBeaconData(w, r)
if err != nil {
log.Errorf(context, "error getting beacondata %v", err)
w.WriteHeader(http.StatusInternalServerError)
return nil, err
}
for _, element := range beacondata {
q := datastore.NewQuery("physicalbeacondata").Filter("NamespaceID =", element.NamespaceID).Filter("InstanceID =", element.InstanceID)
beacondatastatic := []types.BeaconDataStatic{}
_, err := q.GetAll(context, &beacondatastatic)
if err != nil {
log.Errorf(context, "cant get query %v", err)
w.WriteHeader(http.StatusInternalServerError)
return nil, err
}
var beacondataXY = types.BeaconDataXY{}
beacondataXY.NamespaceID = element.NamespaceID
beacondataXY.InstanceID = element.InstanceID
beacondataXY.XCoord = beacondatastatic[0].XCoord
beacondataXY.YCoord = beacondatastatic[0].YCoord
beacondataXY.Distance = element.Distance
returnBeaconData = append(returnBeaconData, beacondataXY)
//log.Infof(context, "beaondataXY tot %v", beacondataXY)
}
根据那个更新,但仍然是相同的问题,因为我在另一个解决方案中回答。索引超出范围 –
请发布完整的堆栈跟踪。 – Makkes
如何查看堆栈跟踪?或者是堆栈跟踪整个错误输出? http://imgur.com/wMj90Fz –