Unable to decode toml file-CodePudding

I want to read configs from a toml file.

conf/conf.toml

db_host = "127.0.0.1"

db_port = 3306

db_user = "root"

db_password ="123456"

conf/conf.go file

package conf

import (
    "log"
    "github.com/BurntSushi/toml"
)

type appcfg struct {
    DbHost     string `toml:"db_host"`
    DbPort     string `toml:"db_port"`
    DbUser     string `toml:"db_user"`
    DbPassword string `toml:"db_password"`
}

var (
    App       *appcfg
    defConfig = "./conf/conf.toml"
)

func init() {

    var err error
    App, err = initCfg()
    log.Println(App.DbHost)

}

func initCfg() (*appcfg, error) {
    app := &appcfg{}
    _, err := toml.DecodeFile(defConfig, &app)
    if err != nil {
        return nil, err
    }
    return app, nil
}

When I run this program, I get an error that I don't know how to fix:

panic: runtime error: invalid memory address or nil pointer dereference

CodePudding user response：

(Reposting Comin2021's now deleted answer in English, since it was accepted by the OP)

You defined the type of your DbPort as string but it appears as an integer in your configuration file. Change it as below:

type appcfg struct {
    DbHost     string `toml:"db_host"`
    DbPort     int64  `toml:"db_port"`  // change this
    DbUser     string `toml:"db_user"`
    DbPassword string `toml:"db_password"`
}

Also check that initCfg second return value err is not empty and log it.