用cgo制作C字符串 | 用cgo制作C字符串

本文介绍了用cgo制作C字符串的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图从C中去掉一个字符串。我有指针和长度，所以如果我是这样做的话，我可以调用C.GoStringN

cgo 生成 GoString struct，所以我是想知道是否可以直接使用它：

  // cgo生成的结构
 typedef struct {const char * p; GoInt n; } GoString; 
 
 //我有其他地方的s和n，我可以这样做吗？ 
 const char * s = ...; //我拥有这个并且不想去释放它
 int n = ...; 
 
 GoString st = {s，n};

我在将一个字符串从 char * 我的生命周期由我控制。 GoString 然后被用作go函数的参数：

  //输出Nbytes 
 func Nbytes（s string）int {
 ... 
}

会去垃圾收集器试图回收内存吗？

解决方案

Go的垃圾回收器不会尝试回收使用C内存分配器分配的内存。你所描述的应该是安全的。当然，你可能无法释放C内存，因为你不知道Go何时会完成它。

 
I'm trying to make a go string from C. I have the pointer and the length, so if I was doing it from go, I could call the C.GoStringN function. 
cgo generates the GoString struct, so I was wondering if I could use it directly: 
// struct generated by cgo
typedef struct { const char *p; GoInt n; } GoString;

// I have s and n from somewhere else, can I do this ?
const char* s = ... ; // I own this and dont want go to free it
int n = ... ;

GoString st = {s, n } ;
I'm using this in here to make a go string out of a char* whose lifetime I control. The GoString is then used as an argument to a go function: 
//export Nbytes
func Nbytes(s string) int {
  ...
}
Will go's garbage collector attempt to reclaim the memory ?
 解决方案 
Go's garbage collector will not try to reclaim memory allocated using the C memory allocator.  What you are describing should be safe.  Of course, you may not be able to free the C memory, because you don't know when Go will be done with it.
                        这篇关于用cgo制作C字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！