如何向ReadFile里传递自己的参数

Question

我再一个文件服务器里实现了完成端口的模型，它就有多个SOCKET的线程同时访问一个文件句柄的情况，每次读写的时候都要传递一些特定的参数进去，使用全局的话不安全 等待效率又低。我本来想象APC那样在OVERLAPPED的EVENT里放个指针，但是这个模型下又不可以，如何传呢？

Answer 1

typedef struct _tagMyOverlapped
{
    OVERLAPPED overlapped;
    LPVOID     pMyParam;
} _MyOverlapped;
...
_MyOverlapped oFile;
...
oFile.pMyParam = ...;
ReadFile( ..., &oFile, ...);
...
LPOVERLAPPED lpOverlapped;
GetQueuedCompletionStatus(...,lpOverlapped,...)
_MyOverlapped *pMyOverlapped = (_MyOverlapped*)lpOverlapped;
...这个方法试试看吧

Answer 2

写错了
ReadFile( ..., &oFile, ...);
-->
ReadFile( ..., &oFile.overlapped, ...);