去未定义的导入函数

Question

我在使用不应该有任何问题的函数时遇到了问题。 在 Go 中，以大写字母开头的函数在包外具有可见性。

---

node.go

package grid  

type Node struct {  
    id uint  
    name string  
    pos_i uint  
    pos_j uint  
    node_type string  
}

grid.go

package grid

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    the Grid Structure
____________________________________________________________________________
*/
type Grid struct {
    // The numbers of divisions in the Grid
    number_lines uint
    number_columns uint 

    // The Sizes of the Grid
    width uint
    height uint

    // An Array of the Nodes
    nodes []Node
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Initialize the Grid
____________________________________________________________________________
*/
func InitGrid() *Grid {
    g := new(Grid)

    g.number_lines = 4
    g.number_columns = 4

    g.width = 400
    g.height = 400

    return g
}

main.go

package main

import (
    "fmt"
    "grid"
)

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Entry Point of the Application
____________________________________________________________________________
*/
func main() {
    grid_ := grid.InitGrid()
    fmt.Println(grid_)    
}

---

src/grid/Makefile

include $(GOROOT)/src/Make.inc

TARG=grid

GOFILES=\
    node.go\
    grid.go\

include $(GOROOT)/src/Make.pkg

src/main/Makefile

include $(GOROOT)/src/Make.inc

TARG=main

GOFILES=\
    main.go\

include $(GOROOT)/src/Make.cmd

---

当我编译 grid 包时，一切顺利，但是当我尝试编译 le main 包时，它给了我这个错误消息：

manbear@manbearpig:~/Bureau/go_code/main$ gomake  
6g  -o _go_.6 main.go  
main.go:15: undefined: grid.InitGrid  
make: *** [_go_.6] Erreur 1  

我不明白为什么它会给我这个错误，我已经花了一些时间阅读 Go 文档，但我找不到它不起作用的原因。

感谢您的帮助。

Answer 1

您仅使用 node.go 源文件编译并安装了 grid 软件包。使用node.go 和grid.go 源文件编译并安装grid 包。例如，

include $(GOROOT)/src/Make.inc

TARG=grid
GOFILES=\
    grid.go\
    node.go\

include $(GOROOT)/src/Make.pkg