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.
后来百度无果,Google链接到官方文档看到下面这段解释
// 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
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