How to access global variables

Question

How do I access a variable that was declared init in my main go in a different  go package file  Keeps telling me that the variable is undefined  I know that global variables are bad but this is just to be used as a timestamp   in main go  var StartTime   time Now   func main          trying to access StartTime in a different  go file but keep getting StartTime undefined

User · Answer

I create a file dif go that contains your code   package dif  import        time     var StartTime   time Now     Outside the folder I create my main go  it is ok   package main  import       dif    dif       fmt     func main         fmt Println dif StartTime      Outputs   2016-01-27 21 56 47 729019925  0800 CST   Files directory structure   folder   main go   dif     dif go   It works

User · Answer

I suggest use the common way of import    First I will explain the way it called  relative import  maybe this way cause of some error  Second I will explain the common way of import    FIRST    In go version    1 12 there is some new tips about import file and somethings changed   1- You should put your file in another folder for example I create a file in  model  folder and the file s name is  example go   2- You have to use uppercase when you want to import a file   3- Use Uppercase for variables  structures and functions that you want to import in another files  Notice  There is no way to import the main go in another file   file directory is   root       main go       model                 example go   this is a  example go   package model  import        time     var StartTime   time Now     and this is main go you should use uppercase when you want to import a file   Mod  started with uppercase  package main  import       Mod    model       fmt     func main         fmt Println Mod StartTime      NOTE     NOTE  I don t recommend this this type of import   SECOND     normal import   the better way import file is   your structure should be like this   root       github com                    Your-account-name-in-github                                      Your-project-name                                                    main go                                                    handlers                                                    models                                              gorilla                                     sessions    and this is a example   package main  import        github com gorilla sessions     func main           you can use sessions here     so you can import  github com gorilla sessions  in every where that you want   just import it

User · Answer

I would  inject  the starttime variable instead  otherwise you have a circular dependency between the packages   main go  var StartTime   time Now   func main        otherPackage StartTime   StartTime     otherpackage go  var StartTime time Time

[variables] How to access global variables

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