golang1.7 关于CGO的一个小问题:C.free使用.
发布时间:2020-12-16 18:28:12 所属栏目:大数据 来源:网络整理
导读:package main// #include stdlib.h import "C" import ( "fmt" "syscall" "unsafe" )func main() { kernel := syscall .NewLazyDLL ( "Kernel32.dll" ) defer syscall .CloseHandler (syscall .Handle .(kernel .Handle ())) volume := kernel .NewProc ( "G
package main
// #include <stdlib.h>
import "C"
import (
"fmt"
"syscall"
"unsafe"
)
func main() {
kernel := syscall.NewLazyDLL("Kernel32.dll")
defer syscall.CloseHandler(syscall.Handle.(kernel.Handle()))
volume := kernel.NewProc("GetVolumePathNameA")
char := C.CString("D:")
defer C.free(unsafe.Pointer(char))
n := make([]byte,254)
_,_,err := volume.Call(uintptr(unsafe.Pointer(char)),uintptr(unsafe.Pointer(&n[0])),254)
fmt.Println(err)
fmt.Println(string(n))
}
当我想使用C.free()释放申请的变量的时候.提示没有此函数. // Go string to C string
// The C string is allocated in the C heap using malloc.
// It is the caller's responsibility to arrange for it to be
// freed,such as by calling C.free (be sure to include stdlib.h
// if C.free is needed).
func C.CString(string) *C.char
// C string to Go string
func C.GoString(*C.char) string
// C data with explicit length to Go string
func C.GoStringN(*C.char,C.int) string
// C data with explicit length to Go []byte
func C.GoBytes(unsafe.Pointer,C.int) []byte
所以使用C.free的时候必须要 include (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |