windows下对socket的send和recv的超时设置，并附一个简洁明了的socket简单demo

 1 #include <stdio.h>  
 2 #include <winsock2.h>  
 3  
 4 #pragma comment(lib,"ws2_32.lib")  
 5  
 6 int main(int argc, char* argv[])
 7 {
 8     //初始化WSA  
 9     WORD sockVersion = MAKEWORD(2, 2);
10     WSADATA wsaData;
11     if (WSAStartup(sockVersion, &wsaData) != 0)
12     {
13         return 0;
14     }
15     //创建套接字  
16     SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
17     if (slisten == INVALID_SOCKET)
18     {
19         printf("socket error !");
20         return 0;
21     }
22     //绑定IP和端口  
23     sockaddr_in sin;
24     sin.sin_family = AF_INET;
25     sin.sin_port = htons(8888);
26     sin.sin_addr.S_un.S_addr = INADDR_ANY;
27     if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
28     {
29         printf("bind error !");
30     }
31     //开始监听  
32     if (listen(slisten, 5) == SOCKET_ERROR)
33     {
34         printf("listen error !");
35         return 0;
36     }
37     //循环接收数据  
38     SOCKET sClient;
39     sockaddr_in remoteAddr;
40     int nAddrlen = sizeof(remoteAddr);
41     char revData[1024];
42     while (true)
43     {
44         printf("等待连接...\n");
45         sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
46         if (sClient == INVALID_SOCKET)
47         {
48             printf("accept error !");
49             continue;
50         }
51         //接收数据  
52         int ret = recv(sClient, revData, 255, 0);
53         if (ret > 0)
54         {
55             revData[ret] = 0x00;
56             printf(revData);
57         }
58         //发送数据  
59         const char * sendData = "你好，TCP客户端！\n";
60         send(sClient, sendData, strlen(sendData), 0);
61     }
62     closesocket(sClient);
63     closesocket(slisten);
64     WSACleanup();
65     return 0;
66 }

#include <winsock2.h>  
#include <WS2tcpip.h>
#include<stdio.h>
#include<iostream>
#include<cstring>
 
using namespace std;
#pragma comment(lib, "ws2_32.lib")
 
int main()
{
    WORD sockVersion = MAKEWORD(2, 2);
    WSADATA data;
    if (WSAStartup(sockVersion, &data) != 0)
    {
        return 0;
    }
    sockaddr_in serAddr;
    serAddr.sin_family = AF_INET;
    serAddr.sin_port = htons(8888);
    inet_pton(AF_INET, "127.0.0.1", &serAddr.sin_addr);
 
    while (true) 
    {
        SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (sclient == INVALID_SOCKET)
        {
            printf("invalid socket!");
            return 0;
        }
        if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
        {  //连接失败 
            printf("connect error !");
            closesocket(sclient);
            return 0;
        }
        send(sclient, "asd", strlen("asd"), 0);
        char recData[255];
        int ret = recv(sclient, recData, 255, 0);
        if (ret > 0) {
            recData[ret] = 0x00;
            printf(recData);
        }
        closesocket(sclient);
    }
    WSACleanup();
    return 0;
}