go memcpy

来源：https://github.com/jsgilmore/shm

  

   

    

     

    
    

     

      callback := syscall.NewCallback(func(r uintptr, size int) (ret uintptr) {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       // 定义一个[]byte切片，用来存储C返回的字符串
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       t1 := time.Now() // get current time
     
    
   

    

     

    
    

     

       data := make([]byte,size)
     
    
   

    

     

    
    

     

       C.memcpy(unsafe.Pointer(&data[0]), unsafe.Pointer(r), C.size_t(size))
     
    
  
 

  

   

    

     

    
    

     

      package shm
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      //#include <string.h>
     
    
   

    

     

    
    

     

      import "C"
     
    
   

    

     

    
    

     

      import "unsafe"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      func memcpy(dest, src []byte) int {
     
    
   

    

     

    
    

     

      	n := len(src)
     
    
   

    

     

    
    

     
	if len(dest) < len(src) {
     
    
   

    

     

    
    

     

      		n = len(dest)
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
	if n == 0 {
     
    
   

    

     

    
    

     
		return 0
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      	C.memcpy(unsafe.Pointer(&dest[0]), unsafe.Pointer(&src[0]), C.size_t(n))
     
    
   

    

     

    
    

     
	return n
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      func memmove(dest, src []byte) int {
     
    
   

    

     

    
    

     

      	n := len(src)
     
    
   

    

     

    
    

     
	if len(dest) < len(src) {
     
    
   

    

     

    
    

     

      		n = len(dest)
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
	if n == 0 {
     
    
   

    

     

    
    

     
		return 0
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      	C.memmove(unsafe.Pointer(&dest[0]), unsafe.Pointer(&src[0]), C.size_t(n))
     
    
   

    

     

    
    

     
	return n
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/88416455