结构体要的成员变量可以用ZeroMemory函数来清零吗？

Question

本帖最后由 VisualEleven 于 2014-02-28 14:32:38 编辑

Answer 1

你写的是对的，不知道你哪里有问题：
typedef struct {
    OVERLAPPED OVerlapped;
    WSABUF DATABuf;
    char Buffer[DATA_BUFSIZE];
    DWORD BytesSend;
    DWORD BytesRecv;
} IO_DATA;IO_DATA PerIOData;
ZeroMemory(&PerIOData.OVerlapped), sizeof(OVERLAPPED));IO_DATA *pPerIOData = new IO_DATA;
ZeroMemory(&pPerIOData->OVerlapped), sizeof(OVERLAPPED));
delete pPerIOData;
你也可以定义宏：#define _sizeof(s, m) sizeof(((s *)0)->m)
把 sizeof(OVERLAPPED) 改写为：_sizeof(IO_DATA, OVerlapped)