？哪位高手能解释一下，下面的语句是啥意思

？谁能解释一下，下面的语句是啥意思
typedef L2_NOTIFICATION_DATA WLAN_NOTIFICATION_DATA, *PWLAN_NOTIFICATION_DATA;

// the callback function for notifications
typedef VOID (WINAPI *WLAN_NOTIFICATION_CALLBACK) (PWLAN_NOTIFICATION_DATA, PVOID);

// public APIs
DWORD WINAPI
WlanOpenHandle(
    __in DWORD dwClientVersion,
    __reserved PVOID pReserved,
    __out PDWORD pdwNegotiatedVersion,
    __out PHANDLE phClientHandle
);
winapi typedef callback wlan
[解决办法]
http://blog.csdn.net/perry_peng/article/details/6067590
[解决办法]

  WLAN_NOTIFICATION_DATA = L2_NOTIFICATION_DATA;
  PWLAN_NOTIFICATION_DATA = ^L2_NOTIFICATION_DATA;
  WLAN_NOTIFICATION_CALLBACK = procedure (data : PWLAN_NOTIFICATION_DATA;  some: Pointer); stdcall;

function WlanOpenHandle( dwClientVersion: DWord; pReserved: Pointer;
    var pdwNegotiatedVersion:DWord; var phClientHandle:THandle ): DWord; stdcall; external 'xxxxxx.dll';