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/**
* TCP客户端通信基本流程
* zhangyl 2018.12.13
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <iostream>
#include <string.h>
#define SERVER_ADDRESS "127.0.0.1"
#define SERVER_PORT 3000
#define SEND_DATA "helloworld"
int main(int argc, char* argv[])
{
//1.创建一个socket
int clientfd = socket(AF_INET, SOCK_STREAM, 0);
if (clientfd == -1)
{
std::cout << "create client socket error." << std::endl;
return -1;
}
//2.连接服务器
struct sockaddr_in serveraddr;
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = inet_addr(SERVER_ADDRESS);
serveraddr.sin_port = htons(SERVER_PORT);
if (connect(clientfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) == -1)
{
std::cout << "connect socket error." << std::endl;
close(clientfd);
return -1;
}
//3. 向服务器发送数据
int ret = send(clientfd, SEND_DATA, strlen(SEND_DATA), 0);
if (ret != strlen(SEND_DATA))
{
std::cout << "send data error." << std::endl;
close(clientfd);
return -1;
}
std::cout << "send data successfully, data: " << SEND_DATA << std::endl;
//4. 从客户端收取数据
char recvBuf[32] = {0};
ret = recv(clientfd, recvBuf, 32, 0);
if (ret > 0)
{
std::cout << "recv data successfully, data: " << recvBuf << std::endl;
}
else
{
std::cout << "recv data error, data: " << recvBuf << std::endl;
}
//5. 关闭socket
//close(clientfd);
//这里仅仅是为了让客户端程序不退出
while (true)
{
sleep(3);
}
return 0;
}
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