そこで、以下のようなDLLImport宣言を行い、以下のようにAPIコールをした場合に、WlanScanのreturn値がERROR_INVALID_PARAMETERとなってしまいます。
namespace NativeWiFi
{
class Wlanapi
{
/// <summary>
/// DWORD WINAPI WlanOpenHandle(
/// __in DWORD dwClientVersion,
/// __reserved PVOID pReserved,
/// __out PDWORD pdwNegotiatedVersion,
/// __out PHANDLE phClientHandle
/// );
/// </summary>
[DllImport("Wlanapi.dll", EntryPoint = "WlanOpenHandle")]
public static extern uint WlanOpenHandle(uint dwClientVersion, IntPtr pReserved, [Out] out uint pdwNegotiatedVersion, ref IntPtr ClientHandle);
public const uint client_version_xp = 1;
public const uint client_version_vista = 2;
/// <summary>
/// DWORD WINAPI WlanEnumInterfaces(
/// __in HANDLE hClientHandle,
/// __reserved PVOID pReserved,
/// __out PWLAN_INTERFACE_INFO_LIST *ppInterfaceList
/// );
/// </summary>
[DllImport("Wlanapi.dll", EntryPoint = "WlanEnumInterfaces")]
public static extern uint WlanEnumInterfaces([In] IntPtr hClientHandle, IntPtr pReserved, ref IntPtr ppInterfaceList);
[StructLayout(LayoutKind.Sequential)]
public struct WLAN_INTERFACE_INFO_LIST
{
public Int32 dwNumberOfItems;
public Int32 dwIndex;
public WLAN_INTERFACE_INFO[] InterfaceInfo;
/// <summary>
/// Constructor for WLAN_INTERFACE_INFO_LIST.
/// Constructor is needed because the InterfaceInfo member varies based on how many adapters are in the system.
/// </summary>
/// <param name="pList">the unmanaged pointer containing the list.</param>
public WLAN_INTERFACE_INFO_LIST(IntPtr pList)
{
// The first 4 bytes are the number of WLAN_INTERFACE_INFO structures.
dwNumberOfItems = Marshal.ReadInt32(pList, 0);
// The next 4 bytes are the index of the current item in the unmanaged API.
dwIndex = Marshal.ReadInt32(pList, 4);
// Construct the array of WLAN_INTERFACE_INFO structures.
InterfaceInfo = new WLAN_INTERFACE_INFO[dwNumberOfItems];
for (int i = 0; i < dwNumberOfItems; i++)
{
// The offset of the array of structures is 8 bytes past the beginning. Then, take the index and multiply it by the number of bytes in the structure.
// the length of the WLAN_INTERFACE_INFO structure is 532 bytes - this was determined by doing a sizeof(WLAN_INTERFACE_INFO) in an unmanaged C++ app.
IntPtr pItemList = new IntPtr(pList.ToInt32() + (i * 532) + 8);
// Construct the WLAN_INTERFACE_INFO structure, marshal the unmanaged structure into it, then copy it to the array of structures.
WLAN_INTERFACE_INFO wii = new WLAN_INTERFACE_INFO();
wii = (WLAN_INTERFACE_INFO)Marshal.PtrToStructure(pItemList, typeof(WLAN_INTERFACE_INFO));
InterfaceInfo[i] = wii;
}
}
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WLAN_INTERFACE_INFO
{
/// GUID->_GUID
public Guid InterfaceGuid;
/// WCHAR[256]
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string strInterfaceDescription;
/// WLAN_INTERFACE_STATE->_WLAN_INTERFACE_STATE
public WLAN_INTERFACE_STATE isState;
}
public enum WLAN_INTERFACE_STATE
{
/// wlan_interface_state_not_ready -> 0
wlan_interface_state_not_ready = 0,
/// wlan_interface_state_connected -> 1
wlan_interface_state_connected = 1,
/// wlan_interface_state_ad_hoc_network_formed -> 2
wlan_interface_state_ad_hoc_network_formed = 2,
/// wlan_interface_state_disconnecting -> 3
wlan_interface_state_disconnecting = 3,
/// wlan_interface_state_disconnected -> 4
wlan_interface_state_disconnected = 4,
/// wlan_interface_state_associating -> 5
wlan_interface_state_associating = 5,
/// wlan_interface_state_discovering -> 6
wlan_interface_state_discovering = 6,
/// wlan_interface_state_authenticating -> 7
wlan_interface_state_authenticating = 7,
}
/// <summary>
/// DWORD WINAPI WlanScan(
/// __in HANDLE hClientHandle,
/// __in const GUID *pInterfaceGuid,
/// __in_opt const PDOT11_SSID pDot11Ssid,
/// __in_opt const PWLAN_RAW_DATA pIeData,
/// __reserved PVOID pReserved
/// );
/// </summary>
[DllImport("Wlanapi.dll", EntryPoint = "WlanEnumInterfaces")]
public static extern uint WlanScan(IntPtr hClientHandle, ref Guid InterfaceGuid, IntPtr pDot11Ssid, IntPtr pIeData, IntPtr pReserved);
public partial class Form1 : Form
{
IntPtr ClientHandle;
uint NegotiatedVersion;
Guid InterFaceGUID;
Wlanapi.WLAN_AVAILABLE_NETWORK_LIST AvailableNetworkList;
public Form1()
{
InitializeComponent();
this.ClientHandle = new IntPtr();
this.InterFaceGUID = new Guid();
}
private void btnScan_Click(object sender, EventArgs e)
{
uint result;
result = Wlanapi.WlanOpenHandle(Wlanapi.client_version_xp, IntPtr.Zero, out this.NegotiatedVersion, ref this.ClientHandle);
if (result != Wlanapi.Win32Err.ERROR_SUCCESS)
{
MessageBox.Show("WlanOpenHandleError:" + result.ToString());
return;
}
IntPtr InterfaceList = new IntPtr();
result = Wlanapi.WlanEnumInterfaces(this.ClientHandle, IntPtr.Zero, ref InterfaceList);
if (result != Wlanapi.Win32Err.ERROR_SUCCESS)
{
MessageBox.Show("WlanEnumInterfacesError:" + result.ToString());
return;
}
Wlanapi.WLAN_INTERFACE_INFO_LIST interfaces = new Wlanapi.WLAN_INTERFACE_INFO_LIST(InterfaceList);
this.InterFaceGUID = interfaces.InterfaceInfo[0].InterfaceGuid;
result = Wlanapi.WlanScan(this.ClientHandle, ref InterFaceGUID, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
if (result != Wlanapi.Win32Err.ERROR_SUCCESS)
{
MessageBox.Show("WlanScanError:" + result.ToString());
return;
}
