在vscode中调用golang自定义包及调试配置

写自定义包的源文件

注意路径！注意路径！注意路径！重要的事情说三遍！
这个文件夹及其源代码一定要放在GOPATH/GOROOT路径下，在调包时才能import到该文件！
在正确的路径下新建pack1文件夹，在文件夹中新建pack1.go，代码如下：

package pack1

type StructX struct {
    A int
    B float64
    C string
}

调用自定义包

在main.go中代码如下：

package main
import (
    "fmt"
    "./pack1"
)

func main() {
    struct1 := new(pack1.StructX)
    struct1.A = 10
    struct1.B = 16.0
    struct1.C = "Mr_zwX"

    fmt.Printf("A = %d\n", struct1.A)
    fmt.Printf("B = %f\n", struct1.B)
    fmt.Printf("C = %s\n", struct1.C)
}

/*  A = 10
	B = 16.000000
	C = Mr_zwX  */

可见性

由于可见性规则，在struct的body中不能用小写字母开头，如果我们把ABC换成abc，变量未定义！

# command-line-arguments
.\main.go:9:12: struct1.a undefined (cannot refer to unexported field or method a)
.\main.go:10:12: struct1.b undefined (cannot refer to unexported field or method b)
.\main.go:11:12: struct1.c undefined (cannot refer to unexported field or method c)
.\main.go:13:35: struct1.a undefined (cannot refer to unexported field or method a)
.\main.go:14:35: struct1.b undefined (cannot refer to unexported field or method b)
.\main.go:15:35: struct1.c undefined (cannot refer to unexported field or method c)

用vscode中dlv工具调试golang代码

安装dlv工具

可在cmd中命令行安装，把dlv调试器放在GOPATH的bin目录下，输入代码：

go install github.com/derekparker/delve/cmd/dlv

在调试窗口修改launch.json中的参数

    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch",
            "type": "go",
            "request": "launch",
            "mode": "auto",//auto->debug
            "program": "${fileDirname}",//${fileDirname}->代码所在文件夹路径
            "env": {},
            "args": []
        }
    ]

然后就可以开始快乐地 debug了，变量值在左栏显示