Hi all,
I am trying to access members of a C struct from go. Compiler is showing
structure's members are undefined. I have attached my code and the error
message below.
Please have a look and help if you can.
*$CGO_ENABLED=1 go run main.go cfuncs.go*
*# command-line-arguments./main.go:18:44: baz_ptr.b undefined (type *GoBaz
has no field or method b)./main.go:19:44: baz_ptr.f undefined (type *GoBaz
has no field or method f)*
//c_header.h
typedef void (*cb)(void* qux, int status, void *command_data, void
*cb_data);
typedef struct{
int a;
int b;
} Foo;
typedef struct{
char* ch;
cb callback;
} Bar;
typedef struct{
Foo* f;
Bar* b;
} Baz;
//--------------------------------
//cfuncs.go
package main
/*
#include<c_header.h>
#include <stdlib.h>
Baz* allocateBaz(){
Baz* baz = malloc(sizeof(Baz));
Bar* bar = malloc(sizeof(Bar));
Foo* foo = malloc(sizeof(Foo));
baz->f = foo;
baz->b = bar;
return baz;
}
*/
import "C"
//-------------------------------------------------
//main.go
package main/*
#include<c_header.h>
extern Baz* allocateBaz();
*/
import "C"
import "unsafe"
type GoBaz C.struct_Baz
type GoBar C.struct_Bar
type GoFoo C.struct_Foo
func main() {
baz_ptr := (*GoBaz)(unsafe.Pointer(C.allocateBaz()))
bar_ptr := (*GoBar)(unsafe.Pointer(baz_ptr.b))
foo_ptr := (*GoFoo)(unsafe.Pointer(foo_ptr.f))
}
//--------------------------------
Thanks in advance!
Regards
Ami
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