winsock阻塞模型

#include<windows.h>
#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")

using namespace std;
int main() {
    
    
	//初始化一个winsock版本的结构体
	WSADATA wsaData;
	int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

	if (iResult != NO_ERROR)return 1;
	//声明一个socket
	SOCKET m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (m_socket == INVALID_SOCKET) {
    
    
		WSACleanup();
		return 1;
	}
	sockaddr_in addr;

	int addr_len = sizeof(sockaddr_in);
	int port = 9901;
	int errCode;
	//inet_addr(char *) ->ulong
	//inet_ntoa(in_addr in)->char
	//htons short
	//htonl long
	//ntohs short
	//
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = inet_addr("127.0.0.1");
	connect(m_socket, (SOCKADDR*)&addr, sizeof SOCKADDR);
	char buf[2048]="hello world\n";
	while(1)
	send(m_socket, buf, strlen(buf) + 1, 0);

	return 0;


}

#include<windows.h>
#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")

using namespace std;
int main() {
    
    
	WSADATA wsaData;
	int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

	SOCKET m_socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	struct sockaddr_in addr;
	int addr_len = sizeof(sockaddr_in);
	int port = 9901;
	int errCode;
	//inet_addr(char *) ->ulong
	//inet_ntoa(in_addr in)->char
	//htons short
	//htonl long
	//ntohs short
	//
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = htonl(INADDR_ANY);

	errCode = bind(m_socket, (SOCKADDR*)&addr, addr_len);

	errCode = listen(m_socket, 3);

	SOCKET sockAcpt;
	sockaddr_in from;
	int len = sizeof from;
	sockAcpt = accept(m_socket, (sockaddr*)&from,&len);
	char buf[2048];
	while (1) {
    
    
		recv(sockAcpt, buf, 2048, MSG_PEEK);
		cout << buf << endl;
	}
	return 0;


}

server

• 声明监听socket
• 给出地址和结构体
• bind
• listen
• 客户端连接上有一个socket
• recv 和send

client

• 声明socket
• 给出地址和端口
• connect
• recv 和send
  client端没有指明自身端口，但也可以指出，一般不
  建议，可能端口已经被占用，这个过程最好交给操作系统
  分配

#include<windows.h>
#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")

using namespace std;
int main() {
    
    
	WSADATA wsaData;
	int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
	if (iResult != NO_ERROR)return 1;
	SOCKET m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (m_socket == INVALID_SOCKET) {
    
    
		WSACleanup();
		return 1;
	}
	sockaddr_in addr;

	int addr_len = sizeof(sockaddr_in);
	int port = 9901;
	int errCode;
	//inet_addr(char *) ->ulong
	//inet_ntoa(in_addr in)->char
	//htons short
	//htonl long
	//ntohs short
	//
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = inet_addr("127.0.0.1");

	sockaddr_in sockaddr_self;
	sockaddr_self.sin_family = AF_INET;
	sockaddr_self.sin_port = htons(12345);
	sockaddr_self.sin_addr.s_addr = inet_addr("127.0.0.1");
	bind(m_socket, (SOCKADDR*)&sockaddr_self, addr_len);
	connect(m_socket, (SOCKADDR*)&addr, sizeof SOCKADDR);
	char buf[2048]="hello world\n";
	while(1)
	send(m_socket, buf, strlen(buf) + 1, 0);

	return 0;


}