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我想在beego下使用验证码生成验证码。但它有错误无效的内存地址或零指针取消引用。有谁知道如何解决这个问题？谢谢。

request method: get
request url:    /accounts/forgotpassword
remoteaddr: 127.0.0.1
stack
c:/go/src/runtime/asm_amd64.s:573
c:/go/src/runtime/panic.go:505
c:/go/src/text/template/exec.go:137
c:/go/src/runtime/asm_amd64.s:573
c:/go/src/runtime/panic.go:505
c:/go/src/runtime/panic.go:63
c:/go/src/runtime/signal_windows.go:167
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/utils/captcha/captcha.go:186
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/utils/captcha/captcha.go:164
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/utils/captcha/captcha.go:267
c:/go/src/runtime/asm_amd64.s:573
c:/go/src/reflect/value.go:447
c:/go/src/reflect/value.go:308
c:/go/src/text/template/exec.go:667
c:/go/src/text/template/exec.go:535
c:/go/src/text/template/exec.go:432
c:/go/src/text/template/exec.go:405
c:/go/src/text/template/exec.go:231
c:/go/src/text/template/exec.go:239
c:/go/src/text/template/exec.go:194
c:/go/src/text/template/exec.go:177
c:/go/src/html/template/template.go:137
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/template.go:66
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/controller.go:283
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/controller.go:234
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/controller.go:214
d:/google drive/work/goworkspace/src/github.com/astaxie/beego/router.go:863
c:/go/src/net/http/server.go:2694
c:/go/src/net/http/server.go:1830
c:/go/src/runtime/asm_amd64.s:2361

我的代码： conf\app.conf

# cache provider
cacheprovider = redis
cacheconnection = {"conn":"127.0.0.1:6379"}

控制器\main.go

package controllers

import (
"github.com/astaxie/beego"
"github.com/astaxie/beego/cache"
  "github.com/astaxie/beego/utils/captcha"
)


var(
    cpt *captcha.captcha
    cacheprovider string = beego.appconfig.string("cacheprovider")
    cacheconnection string = beego.appconfig.string("cacheconnection")
)


func init() {
  store, _ := cache.newcache(cacheprovider, cacheconnection)
  cpt = captcha.newwithfilter("/accounts/captca/", store)
}

views\forgotpasswordcontroller\get.tpl

      

        

            

                
reset password
            

            {{create_captcha}}
                
            

            {{if .errors.captcha}}
                {{.errors.captcha}}{{else}}‌{{end}}
                
            
        
      
  

控制器\forgotpassword.go

package controllers

import (
  "github.com/astaxie/beego"
)


type ForgotPasswordController struct {
  beego.Controller
}


func (c *ForgotPasswordController) Get() {
  beego.Debug("In ForgotPasswordController:Get - Start")
  c.Layout = "shared/layout.tpl"
}//end ForgotPasswordController:Get()


func (this *ForgotPasswordController) Post() {

  beego.Debug("In ForgotPasswordController:Post - Start")

  captchaVerification := cpt.VerifyReq(this.Ctx.Request)

  if !captchaVerification {
    errormap := make(map[string]string)
    beego.Debug("In ForgotPasswordController:Post - captchaVerification Got wrong captcha")
    errormap["Captcha"] = "Sorry but the characters you endered didn't match. Please try again"
    this.Data["Errors"] = errormap
    return
  }

} //end ForgotPassword() func

环境

• go 版本 go1.10 windows/amd64
• beego：1.10.1

解决方案

刚刚在我的本地测试了您的代码。该错误来自缓存创建部分。

store, err := cache.newcache(cacheprovider, cacheconnection)
if err != nil {
    log.fatal(err.error())
    os.exit(0)
}

要获取详细的错误，请检查从 cache.newcache() 返回的 err 变量。此外，最佳实践是始终记录来自错误对象的任何可能的错误，不要忽略它。

这是错误日志：

2018/11/14 11:13:24 缓存：未知适配器名称“redis”（忘记导入？）

出现上述错误是因为缓存包无法找到 redis 适配器。这是因为你还没有导入这个包。那么我们尝试导入它，那么您的问题就解决了。

import (
    "fmt"
    "log"
    "os"
    "github.com/astaxie/beego"
    "github.com/astaxie/beego/cache"
    "github.com/astaxie/beego/utils/captcha"

    _ "github.com/astaxie/beego/cache/redis" // <----- this one
)

由于我们不直接与缓存 redis 包交互，因此使用 _ 导入它。

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