Use golang to call the win API

[流沙]

API Address:https://msdn.microsoft.com/en-us/library/ms706716(VS.85).aspx

Code:

package main

// #define WIN32_LEAN_AND_MEAN
// #include <windows.h>

import (
   "fmt"
   "syscall"
   "unsafe"
   "C"
)
var (
   wlankernal,_ = syscall.LoadLibrary("Wlanapi.dll")
   wlanhandle,_ = syscall.GetProcAddress(wlankernal,"WlanOpenHandle")
   wlanclosehandle,_ = syscall.GetProcAddress(wlankernal,"WlanCloseHandle")
   wlanenumInterfaces,_ = syscall.GetProcAddress(wlankernal,"WlanEnumInterfaces")
   wlangetprofile,_ = syscall.GetProcAddress(wlankernal,"WlanGetProfileList")
)
type ulong int32

type WLAN_INTERFACE_INFO  struct{
   InterfaceGuid syscall.GUID
   strInterfaceDescription string
   isState uint
}

type WLAN_INTERFACE_INFO_LIST struct {
   NumberOfItems uint32
   Index uint32
   InterfaceInfo WLAN_INTERFACE_INFO
}

type WLAN_PROFILE_INFO struct{
   ProfileName C.char
   Flags ulong
}

type WLAN_PROFILE_INFO_LIST struct{
   NumberOfItems ulong
   Index ulong
   ProfileInfo WLAN_PROFILE_INFO
}

func abort(funcname string, err error) {
   panic(fmt.Sprintf("%s failed: %v", funcname, err))
}

//打开一个WLAN句柄
func WlanOpenHandle() (result uint32)  {
   negotiated_version := uint32(0)
   client_handle := uint32(0)
   dwClientVersion := uint32(2)
   var nargs uintptr = 4
   ret,_,callErr := syscall.Syscall6(uintptr(wlanhandle),
      nargs,
      uintptr(dwClientVersion),
      0,
      uintptr(unsafe.Pointer(&negotiated_version)),
      uintptr(unsafe.Pointer(&client_handle)),
      0,
      0,
   )
   if ret != 0{
      abort("StartWLANHandleError", callErr)
      return
   }
   result = uint32(client_handle)
   return
}

//关闭WLAN句柄
func WlanCloseHandle()  {
   var nargs uintptr = 2
   handle :=WlanOpenHandle()
   ret,_,callErr := syscall.Syscall(uintptr(wlanclosehandle),
      nargs,
      uintptr(handle),
      0,
      0,
   )
   if ret !=0{
      abort("CloseHandleError",callErr)
      return
   }
   fmt.Println("WlanCloseHandle Successful")
}


func main()  {
   defer syscall.FreeLibrary(wlankernal)
   var nargs uintptr = 3
   handle :=WlanOpenHandle();
   var wlan_interface_info WLAN_INTERFACE_INFO_LIST;
   ret,_,callErr := syscall.Syscall(uintptr(wlanenumInterfaces),
      nargs,
      uintptr(handle),
      0,
      uintptr(unsafe.Pointer(&wlan_interface_info)),
   )
   if ret !=0{
      abort("WlanEnumInterfacesError",callErr)
      return
   }
   WlanCloseHandle()
   fmt.Println(ret)
   fmt.Println(wlan_interface_info)
}

wlan_interface_info returns a value of {7306176 0 {{0 0 0 [0 0 0 0 0 0 0 0]}  0}}

This value seems to be wrong！

May I ask how to solve this problem？

[jake...@gmail.com]

I have not called a Windows API from go before, so there may be other problems with your code. But looking at WlanEnumInterfaces documentation the last parameter is not a pointer to a pointer to a WLAN_INTERFACE_INFO_LIST, it is a pointer to a PWLAN_INTERFACE_INFO_LIST. So, in C terms. it is a WLAN_INTERFACE_INFO_LIST**. In other words, you should be passing it a pointer to a uintptr, then dereferencing it twice to get the actual list.

(Also, don't forget to call WlanFreeMemory when you are done.)

Good Luck
 - Jake

[流沙]

Thanks

在 2017年12月16日星期六 UTC+8上午1:47:33，Jake Montgomery写道：