C++ winsock2，如何判斷連接何時關閉

Question

我有一個使用winsock2的C++程序。我想知道如何判斷某人與我的程序的關係何時關閉。

Answer 1

使用select等待讀取套接字;當套接字關閉時，winsock應該報告它是可讀的。然後從套接字接收將給你0字節，告訴你套接字已關閉。

Answer 2

int received_bytes = recv(_socket, buffer, sizeof(buffer)-1,0); 
if(received_bytes > 0) 
{ 
    //data received 
} 
else if (received_bytes == 0) 
{ 
    //connection closed 
} 

else 
{ 
    //wait for more data 
}