Golang 通过 cgo 调用 C/C++ 静态库（一）

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hello.h

#ifndef HELLO_H_
#define HELLO_H_

#ifdef __cplusplus
extern "C" {
#endif

extern int hello(char *name, int age);

#ifdef __cplusplus
}
#endif

#endif // HELLO_H_

hello.c

#include <stdio.h>
#include "hello.h"

int hello(char *name, int age) {
    printf("Hello %s, your age is %d.\n", name, age);
    return age;
}

test.go

package main

/*
#cgo CFLAGS: -I.
#cgo LDFLAGS: -L. -lhello
#include <stdio.h>
#include <stdlib.h>
#include "hello.h"
*/
import "C"
import (
    "fmt"
    "unsafe"
)

func main() {
    name := C.CString("Jack")
    defer C.free(unsafe.Pointer(name))
    age := C.int(18)

    result := C.hello(name, age)
    fmt.Println(result)
}

编译 C 代码：

gcc -Wall -c hello.c
ar -rv libhello.a hello.o

遇到的报错

could not determine kind of name for C.free

• /* ... */ cgo 注释部分和 import "C" 之间存在空行
• 没有导入 #include <stdlib.h>

参考

https://golang.org/cmd/cgo/