GetOverlappedResults()完全不返回。
我运行了一个简单的示例,当网络接口中的IP地址发生更改时,将设置手动重置事件,并且我可以看到“ IP地址表已更改。”输出,但是即使bWait为false,GetOverlappedResults()也不会返回。即使使用bWait = true,它也应返回,因为已设置了事件,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);
}
}
}
最佳答案
等待是由scanf_s()
引起的。我想你是要printf
返回值不读它。
关于c++ - 具有bWait = false的GetOverlappedResults块,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26327037/