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GetOverlappedResults()根本不返回。
我运行了下面的简单示例,当网络接口中的 IP 地址发生更改时,手动重置事件被设置,我可以看到“IP 地址表已更改..”输出,但即使 bWait 为 false,GetOverlappedResults() 也不会返回. 即使使用 bWait = true 它也应该返回,因为事件已设置,因此 I/O 操作已完成。

到底是怎么回事?

#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <windows.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

void main()
{
    OVERLAPPED overlap;
    DWORD ret, nr;
    HANDLE hand = NULL;
    overlap.hEvent = CreateEvent(NULL, true, false, NULL);

    ret = NotifyAddrChange(&hand, &overlap);

    for (;;)
    {
        if ( WaitForSingleObject(overlap.hEvent, INFINITE) == WAIT_OBJECT_0 )
        {
            printf("IP Address table changed..\n");
            ret = GetOverlappedResult(hand, &overlap, &nr, false);
            scanf_s("%d %d\n", ret, nr);
            printf("done\n");
            NotifyAddrChange(&hand, &overlap);
            ResetEvent(overlap.hEvent);
        }
    }
}
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1 回答 1

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等待是由scanf_s(). 我猜你的意思printf是返回值不读它。

于 2014-10-12T16:53:12.100 回答