Go 戈朗片

我在使用Golang添加到切片时遇到问题

这是我的密码：

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)
}

beacondataxy.go包含以下内容：

package types

type BeaconDataXY struct {
    InstanceID  string
    NamespaceID string
    XCoord      float64
    YCoord      float64
    Distance    float64
}

错误消息如下：

utils.go:139:无法将beacondataXY（type*types.beacondataXY）用作 追加中的type[]types.BeaconDataXY

我真的不知道如何在Golang中处理切片，即使在阅读了一些非常有意义的教程之后。我不确定我做错了什么

我想有一个数组/切片，里面有类型，return BeaconData是[]类型。BeaconDataXY，它应该包含单一类型的BeaconDataXY

谢谢你的帮助

编辑：

代码现在如下所示：

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)
    }

var beacondataXY = types.BeaconDataXY{}

returnBeaconData = append(returnBeaconData, beacondataXY)

---

尝试

returnBeaconData=append（returnBeaconData，*beacondataXY）

new（）内置函数返回指针，您也可以编写：

---

var beacondataXY=types.beacondataXY{}

Try

returnBeaconData=append（returnBeaconData，*beacondataXY）

new（）内置函数返回指针，您也可以编写：

var beacondataXY=types.beacondataXY{}

使用此赋值：

var beacondataXY = new(types.BeaconDataXY)

您正在创建*types.BeaconDataXY类型的变量。只需创建一个新的BeaconDataXY，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)
    }

var beacondataXY = types.BeaconDataXY{}

returnBeaconData = append(returnBeaconData, beacondataXY)

附加到阵列时，请执行以下操作：

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)
    }

var beacondataXY = types.BeaconDataXY{}

returnBeaconData = append(returnBeaconData, beacondataXY)

“…”将假定beacondataXY是一个数组，但它不是，您只想将beacondataXY附加到returnBeaconData。有关此上下文中“…”含义的解释，请参见。

本作业：

var beacondataXY = new(types.BeaconDataXY)

您正在创建*types.BeaconDataXY类型的变量。只需创建一个新的BeaconDataXY，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)
    }

var beacondataXY = types.BeaconDataXY{}

returnBeaconData = append(returnBeaconData, beacondataXY)

附加到阵列时，请执行以下操作：

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)
    }

var beacondataXY = types.BeaconDataXY{}

returnBeaconData = append(returnBeaconData, beacondataXY)

---

---

“…”将假定beacondataXY是一个数组，但它不是，您只想将beacondataXY附加到returnBeaconData。有关“…”在本文中的含义的解释，请参阅。

http:panic serving 127.0.0.1:56095:运行时错误：索引超出范围goroutine 7[正在运行]：

returnBeaconData

是一个片段。索引超出范围发生在数组上。我遇到了这个问题，我想我做了我所做的，以消除索引超出范围的错误。虽然它不起作用，但后来发生了什么？更改您所说的内容时，我发现错误索引超出范围？@simonnilsonguldstrand 1389是行号http:panic serving 127.0.0.1:56095：运行时错误：索引超出范围goroutine 7[运行]：

returnBeaconData

是一个片段。索引超出范围发生在数组上。我遇到了这个问题，我想我做了我所做的，以消除索引超出范围的错误。虽然它不起作用，但后来发生了什么？更改您所说的内容时，我得到的错误索引超出范围？@Simonnilsonguldstrand 1389是根据此更新的行号，但问题与我在另一个解决方案中回答的问题相同。索引超出范围请发布完整的堆栈跟踪。如何查看堆栈跟踪？或者堆栈跟踪是整个错误输出？请参阅前面的评论，发布了一个带有整个堆栈跟踪的imgur链接handlers/utils.go？的第136行中有什么内容？已根据该内容进行了更新，但仍然存在与我在其他解决方案中回答的问题相同的问题。索引超出范围请发布完整的堆栈跟踪。如何查看堆栈跟踪？或者堆栈跟踪是整个错误输出？请参阅前面的评论，发布了一个带有整个堆栈跟踪的imgur链接handlers/utils.go的第136行中有什么？