LPOVERLAPPED pOverlapped=NULL;
SIo *pSIo=NULL;
。。。。。（省略部分代码）
pSIo=(SIo*)pOverlapped;
这里pOverlapped怎么能够强制转换成SIo呢，他们也没有继承关系呀
SIo的定义如下：
class SIo
{
public:
enum emIoType
{
IO_NULL,
IO_RECV,
IO_SEND,
IO_ACCEPTEX,
IO_CONNECTEX,
IO_DISCONNECTEX,
};
public:
SIo(SIo::emIoType type,SHandle *pHandle);
~SIo();
public:
OVERLAPPED m_overlapped;
WSABUF m_wsaBuf;
emIoType m_ioType;
SHandle *m_pHandle;
};
LPOVERLAPPED是完成端口里面的
typedef struct _OVERLAPPED {
ULONG_PTR Internal;
ULONG_PTR InternalHigh;
union {
struct {
DWORD Offset;
DWORD OffsetHigh;
} DUMMYSTRUCTNAME;
PVOID Pointer;
} DUMMYUNIONNAME;
HANDLE hEvent;
} OVERLAPPED, *LPOVERLAPPED;
多用小脑和手，少用大脑、眼睛和嘴，会更快地学会编程！
