英文:
invalid receiver error when using Gin Gonic framework in Go
问题
我正在尝试在基于Gin的Web服务器的路由中使用一个外部（非匿名）函数，如下所示：
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
func main() {
router := gin.Default()
router.GET("/hi/", Hi)
router.Run(":8080")
}
func Hi(c *gin.Context) {
c.String(http.StatusOK, "Hello")
}
但是我遇到了两个错误：
./main.go:13:23: undefined: Hi
./main.go:18:6: cannot define new methods on non-local type gin.Context
我想知道如何在gin gonic中使用匿名函数作为我的端点处理程序？到目前为止，我找到的所有文档都使用了匿名函数。
谢谢！
英文:
I am trying to use an external (non anonymous) function in the routing of my Gin based web server as shown below:
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
func main() {
router := gin.Default()
router.GET("/hi/", Hi)
router.Run(":8080")
}
func (c *gin.Context) Hi() {
c.String(http.StatusOK, "Hello")
}
But I get 2 errors:
./main.go:13:23: undefined: Hi
./main.go:18:6: cannot define new methods on non-local type gin.Context
I am wondering how I can use anonymous functions in my endpoint handlers with gin gonic? All the documentation I've found so far uses anonymous functions.
Thanks!
答案1
得分: 1
你只能在声明该类型的同一包中为类型定义一个新的方法。也就是说，你不能向gin.Context添加一个新的方法。
你应该这样做：
func Hi(c *gin.Context) {
...
英文:
You can only define a new method for a type in the same package declaring that type. That is, you cannot add a new method to gin.Context.
You should do:
func Hi(c *gin.Context) {
...
答案2
得分: 1
package main
import "github.com/gin-gonic/gin"
func main() {
router := gin.Default()
router.GET("/hi", hi)
var n Node
router.GET("/hello", n.hello)
router.GET("/extra", func(ctx *gin.Context) {
n.extra(ctx, "惊喜~")
})
router.Run(":8080")
}
func hi(c *gin.Context) {
c.String(200, "你好")
}
type Node struct{}
func (n Node) hello(c *gin.Context) {
c.String(200, "世界")
}
func (n Node) extra(c *gin.Context, data interface{}) {
c.String(200, "%v", data)
}
英文:
package main
import "github.com/gin-gonic/gin"
func main() {
router := gin.Default()
router.GET("/hi", hi)
var n Node
router.GET("/hello", n.hello)
router.GET("/extra", func(ctx *gin.Context) {
n.extra(ctx, "surprise~")
})
router.Run(":8080")
}
func hi(c *gin.Context) {
c.String(200, "hi")
}
type Node struct{}
func (n Node) hello(c *gin.Context) {
c.String(200, "world")
}
func (n Node) extra(c *gin.Context, data interface{}) {
c.String(200, "%v", data)
}
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