使用WLAN api中WlanGetAvailableNetworkList遇到的问题

Yokishiro 2014-04-27 10:21:56

api中的定义如下：



DWORD WINAPI WlanGetAvailableNetworkList(

  _In_        HANDLE hClientHandle,

  _In_        const GUID *pInterfaceGuid,

  _In_        DWORD dwFlags,

  _Reserved_  PVOID pReserved,

  _Out_       PWLAN_AVAILABLE_NETWORK_LIST *ppAvailableNetworkList

);



typedef struct _WLAN_AVAILABLE_NETWORK_LIST {

  DWORD                  dwNumberOfItems;

  DWORD                  dwIndex;

  WLAN_AVAILABLE_NETWORK Network[1];

} WLAN_AVAILABLE_NETWORK_LIST, *PWLAN_AVAILABLE_NETWORK_LIST;



typedef struct _WLAN_AVAILABLE_NETWORK {

  WCHAR                  strProfileName[256];

  DOT11_SSID             dot11Ssid;

  DOT11_BSS_TYPE         dot11BssType;

  ULONG                  uNumberOfBssids;

  BOOL                   bNetworkConnectable;

  WLAN_REASON_CODE       wlanNotConnectableReason;

  ULONG                  uNumberOfPhyTypes;

  DOT11_PHY_TYPE         dot11PhyTypes[WLAN_MAX_PHY_TYPE_NUMBER];

  BOOL                   bMorePhyTypes;

  WLAN_SIGNAL_QUALITY    wlanSignalQuality;

  BOOL                   bSecurityEnabled;

  DOT11_AUTH_ALGORITHM   dot11DefaultAuthAlgorithm;

  DOT11_CIPHER_ALGORITHM dot11DefaultCipherAlgorithm;

  DWORD                  dwFlags;

  DWORD                  dwReserved;

} WLAN_AVAILABLE_NETWORK, *PWLAN_AVAILABLE_NETWORK;

问题出在c#代码中我对struct _WLAN_AVAILABLE_NETWORK中，使用下面的定义方式，编译可以通过，在运行时会抛出异常：TypeLoadException 无法封送处理类型为“_WLAN_AVAILABLE_NETWORK”的字段“dot11PhyTypes1”: 无效的托管/非托管类型组合(Int32/UInt32 必须与 I4、U4 或 Error 成对出现)。



        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct _WLAN_AVAILABLE_NETWORK

        {

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]

            public string strProfileName;

            public _DOT11_SSID dot11Ssid;

            public _DOT11_BSS_TYPE dot11BssType;

            public UInt64 uNumberOfBssids;

            public int bNetworkConnectable;

            public UInt32 wlanNotConnectableReason;

            public UInt64 uNumberOfPhyTypes;

            [MarshalAs(UnmanagedType.SysUInt, SizeConst = 8)]

            public _DOT11_PHY_TYPE dot11PhyTypes1;

            public int bMorePhyTypes;

            public UInt64 wlanSignalQuality;

            public int bSecurityEnabled;

            public _DOT11_AUTH_ALGORITHM dot11DefaultAuthAlgorithm;

            public _DOT11_CIPHER_ALGORITHM dot11DefaultCipherAlgorithm;

            public UInt32 dwFlags;

            public UInt32 dwReserved;

        }



        [StructLayout(LayoutKind.Sequential)]

        public struct WLAN_AVAILABLE_NETWORK_LIST

        {

            public Int32 dwNumberOfItems;

            public Int32 dwIndex;

            public _WLAN_AVAILABLE_NETWORK[] Network;



            public WLAN_AVAILABLE_NETWORK_LIST(IntPtr pList)

            {

                // The first 4 bytes are the number of _WLAN_AVAILABLE_NETWORK 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_AVAILABLE_NETWORK structures.

                Network = new _WLAN_AVAILABLE_NETWORK[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_AVAILABLE_NETWORK structure is 608 bytes - this

                    // was determined by doing a sizeof(_WLAN_AVAILABLE_NETWORK) in an

                    // unmanaged C++ app.

                    IntPtr pItemList = new IntPtr(pList.ToInt32() + (i * 608) + 8);



                    // Construct the WLAN_INTERFACE_INFO structure, marshal the unmanaged

                    // structure into it, then copy it to the array of structures.

                    _WLAN_AVAILABLE_NETWORK wii = new _WLAN_AVAILABLE_NETWORK();

                    wii = (_WLAN_AVAILABLE_NETWORK)Marshal.PtrToStructure(pItemList,

                        typeof(_WLAN_AVAILABLE_NETWORK)); //执行该语句的时候，抛出异常

                    Network[i] = wii;

                }

            }

        }

如果将代码改为如下形式，则运行正常



        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct _WLAN_AVAILABLE_NETWORK

        {

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]

            public string strProfileName;

            public _DOT11_SSID dot11Ssid;

            public _DOT11_BSS_TYPE dot11BssType;

            public UInt64 uNumberOfBssids;

            public int bNetworkConnectable;

            public UInt32 wlanNotConnectableReason;

            public UInt64 uNumberOfPhyTypes;

            //[MarshalAs(UnmanagedType.SysUInt, SizeConst = 8)]

            public _DOT11_PHY_TYPE dot11PhyTypes1;

            public _DOT11_PHY_TYPE dot11PhyTypes2;

            public _DOT11_PHY_TYPE dot11PhyTypes3;

            public _DOT11_PHY_TYPE dot11PhyTypes4;

            public _DOT11_PHY_TYPE dot11PhyTypes5;

            public _DOT11_PHY_TYPE dot11PhyTypes6;

            public _DOT11_PHY_TYPE dot11PhyTypes7;

            public _DOT11_PHY_TYPE dot11PhyTypes8;

            public int bMorePhyTypes;

            public UInt64 wlanSignalQuality;

            public int bSecurityEnabled;

            public _DOT11_AUTH_ALGORITHM dot11DefaultAuthAlgorithm;

            public _DOT11_CIPHER_ALGORITHM dot11DefaultCipherAlgorithm;

            public UInt32 dwFlags;

            public UInt32 dwReserved;

        }