为什么参数的类型可以自定义？能解释下吗 谢谢！！

Question

typedef struct{ OVERLAPPED Overlapped; WSABUF DataBuf; CHAR Buffer [DATA_BUFERSIZE]; DWORD BytesSEND; DWORD BytesTECB;}PER_IO_OPERATION_DATA,*LPPER_IO_OPERATION_DATA; typedef struct { SOCKET Socket; }PER_HANDLE_DATA,*LPPER_HANDLE_DATA; //服务器接收数据线程 DWORD WINAPI ServerWorkerThread(LPVOID CompletionPortID) { HANDLE CompletionPort=(HANDLE) CompletionPortID; DWORD BytesTransferred; LPPER_HANDLE_DATA PerHandleData; LPPER_IO_OPERATION_DATA PerIoData; DWORD SendBytes,RecbBytes; DWORD Flags; while(TRUE) { if (GetQueuedCompletionStatus(CompletionPort,&BytesTransferred,(LPDWORD)&PerHandleData,(LPOVERLAPPED *)&PerIoData,INFINITE)==0) ////////有三个问题：（1）函数GetQueuedCompletionStatus（）对实参PerHandleData、PerIoData如何处理？（2）这个过程函数是不是对变量PerHandleData、PerIoData赋值？（3）前面定义了两个结构体，结构体对象作PerHandleData、PerIoData为实参。{ reurn 0; } ......}

Answer 1

可以强制转换的。