OVERLAPPED over;
ZerMemory(&over,sizeof(OVERLAPPED));
WSASend(s, &DataBuf, 1, &SendBytes, 0,&over, NULL);
這樣能成功.
如果不執(zhí)行ZerMemory(&over,sizeof(OVERLAPPED));
WSASend就會失敗,錯誤是"句柄無效",請問高手這是為什么?
還有,如果同時執(zhí)行兩次WSASend,OVERLAPPED只有一個,能成功嗎?系統(tǒng)是怎樣分別出哪次WSASend?
謝謝!
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typedef struct _OVERLAPPED {
ULONG_PTR Internal;
ULONG_PTR InternalHigh;
DWORD Offset;
DWORD OffsetHigh;
HANDLE hEvent;
} OVERLAPPED;
注意結構里有HANDLE hEvent
當沒使用ZeroMemory時，hEvent被填充為0xCCCCCCCC，或其他的，就會出現(xiàn)"句柄無效"的錯誤
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但使用了ZeroMemory時,hEvent被填充為0x00000000,也不是一個有效的句柄呀,繼續(xù).
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sdk的代碼中hEvent = NULL。這就是原因！因為你可以不使用事件的，看msdn吧！