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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