CGO-How to access C struct pointer correctly

[陈一剑]

package main


import (
    "fmt"
    /*
       struct Test{
        int ID;
       };


       struct Test * test(){
        struct Test test;
        test.ID=333;
        return &test;
       };
    */
    "C"
)


type c struct {
    ID int
}
type Test struct {
    a string
    b string
}


func main() {
    var b *C.struct_Test=C.test()
    fmt.Println(b.ID)
}

---------------------------------------------
I want to print 333,but the result is strange.

Thanks

Chen

[Jan Mercl]

On Tue, Aug 7, 2018 at 2:42 PM 陈一剑 <cyj...@gmail.com> wrote:


> I want to print 333,but the result is strange.

The answer is provided by the compiler itself:

jnml@r550:~/src/tmp> cat main.go 

package main

import (

"fmt"

/*

   struct Test{

    int ID;

   };

   struct Test * test(){

    struct Test test;

    test.ID=333;

    return &test;

   };

*/

"C"

)

func main() {

b := C.test()

fmt.Println(b.ID)

}

jnml@r550:~/src/tmp> go run main.go 

# command-line-arguments

./main.go: In function ‘test’:

./main.go:14:6: warning: function returns address of local variable [-Wreturn-local-addr]

      return &test;

      ^

1

jnml@r550:~/src/tmp>

--

-j