2014-06-10 wcdj

摘要:本文主要介绍在GoLang中如何实现调用C接口。由于Go的官网经常被墙,导致无法浏览官方的详细文档,偶然间在浏览GoLang的源码中找到了一些关于cgo的用法,具体路径在go/misc/cgo目录下。

例如,在go/misc/cgo/gmp/gmp.go文件中可以找到如何在GoLang中引用C Library的方法:

An example of wrapping a C library in Go. This is the GNU multiprecision library gmp's integer type mpz_t wrapped to look like the Go package big's integer type Int.

下面是一个简单的例子:hello.go

package main

/*

#include

#include

#include

#include "../inc/hello.h"

// intentionally write the same LDFLAGS differently

#cgo linux LDFLAGS: -L../lib -lhello

#cgo darwin LDFLAGS: -L../lib -lhello

#if 0

void hello(const char *name)

{

printf("%s\n", name);

return;

}

#endif

*/

import "C"

import (

"fmt"

"time"

)

func Hello(s string) {

cs := C.CString(s)

C.hello(cs)

}

func main() {

Seed(1000)

fmt.Println(int(C.random()))

time.Sleep(time.Duration(1) * time.Second)

fmt.Println(int(C.random()))

fmt.Println("getpid:", int(C.getpid()))

C.puts(C.CString("call C puts"))

Hello("call C's go wrapper func")

C.hello(C.CString("call C hello func"))

}

func Seed(i int) {

C.srandom(C.uint(i))

}

参考

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