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
完整的代码可以浏览这里:https://github.com/gerryyang/goinaction/blob/master/src/cgo/src/hello.go
package main /* #include <stdio.h> #include <stdlib.h> #include <unistd.h> #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
[1] http://www.cnblogs.com/yjf512/archive/2012/07/19/2599304.html
[2] http://tonybai.com/tag/cgo/
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