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0.通信步骤流程图
（左：服务器；右：客户端；）
1.服务器代码
1.1服务器类头文件(CServer_UDP.h)
#pragma once
#include
class CServer_UDP
{
public:
CServer_UDP();
void SendMsg(const char sendBuf[]);
void RecMsg();
~CServer_UDP();
private:
SOCKET m_sServer;
struct sockaddr_in m_SocAddrClient; //建立连接时，用于保存客户端信息
bool m_terminal;
};
1.2服务器类源文件(CServer_UDP.cpp)
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "CServer_UDP.h"
#include
#pragma comment(lib, "ws2_32.lib")
CServer_UDP::CServer_UDP():m_terminal(false)
{
//必须进行如下初始化， 否则socket()会返回10093错误
//初始化WSA
WORD sockVersion = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(sockVersion, &wsaData) != 0) //通过一个进程初始化ws2_32.dll
{
std::cout << "Initialize WSA failed" << std::endl;
return;
}
//初始化UDDP套接字
m_sServer = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in m_SocAddrserver;
m_SocAddrserver.sin_addr.S_un.S_addr = 0;//htonl(INADDR_ANY);
m_SocAddrserver.sin_family = AF_INET;
m_SocAddrserver.sin_port = htons(8090);
int ret = bind(m_sServer, (sockaddr*)&m_SocAddrserver, sizeof(m_SocAddrserver));
if (ret == -1)
{
std::cout << "bind failed!" << std::endl;
WSACleanup();
}
else
{
//此处必须赋初值，不然会导致服务器端无法正常发送
int len_Client = sizeof(sockaddr);
char recBuf[1025];
int len = recvfrom(m_sServer, recBuf, 1024, 0, (sockaddr*)&m_SocAddrClient, &len_Client);
if (len > 0)
{
recBuf[len] = '\0';
std::cout << "Client say:" << recBuf << std::endl;
}
}
}
void CServer_UDP::SendMsg(const char sendBuf[])
{
int ret = sendto(m_sServer, sendBuf, strlen(sendBuf), 0, (sockaddr*)&m_SocAddrClient, sizeof(m_SocAddrClient));
if (ret == -1)
{
std::cout << "send failed" << std::endl;
std::cout << GetLastError()<< std::endl;
}
}
void CServer_UDP::RecMsg()
{
char recBuf[1025];
while (!m_terminal)
{
//std::cout << "Begin rec...(server)" << std::endl;
int len = recvfrom(m_sServer, recBuf, 1024, 0, 0, 0);
if (len > 0)
{
recBuf[len] = '\0';
std::cout << "Client say:" << recBuf << std::endl;
}
}
}
CServer_UDP::~CServer_UDP()
{
closesocket(m_sServer);
WSACleanup();
}
1.3服务器主函数
#include
#include
#include
#include "CServer_UDP.h"
using namespace std;
int main()
{
CServer_UDP server_UDP;
thread recProc(&CServer_UDP::RecMsg, &server_UDP);
while (1)
{
//cout << "Pleaes input content:" << endl;
string content;
cin >> content;
server_UDP.SendMsg(content.c_str());
}
recProc.join();
cout << "I love china!" << endl;
system("pause");
return 0;
}
2.客户端代码
2.1客户端类头文件(CClient.h)
#pragma once
#include
class CClient
{
public:
CClient();
void RecMsg();
void SendMsg(const char sendBuf[]);
~CClient();
private:
SOCKET m_sockClient;
sockaddr_in m_TargetServer;
};
2.2客户端类源文件(CClient.cpp)
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "CClient.h"
#include
#pragma comment(lib, "ws2_32.lib")
CClient::CClient()
{
//必须进行如下初始化， 否则socket()会返回10093错误
//初始化WSA
WORD sockVersion = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(sockVersion, &wsaData) != 0) //通过一个进程初始化ws2_32.dll
{
std::cout << "Initialize WSA failed" << std::endl;
return;
}
m_sockClient = socket(AF_INET, SOCK_DGRAM, 0);
m_TargetServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
m_TargetServer.sin_family = AF_INET;
m_TargetServer.sin_port = htons(8090);
if (m_sockClient == -1)
{
std::cout << "Create socket failed!" << std::endl;
WSACleanup();
}
else
{
//发送信息与服务器建立连接(必须加)
sendto(m_sockClient, "hello server", strlen("hello server"), 0, (sockaddr*)&m_TargetServer, sizeof(m_TargetServer));
}
}
void CClient::SendMsg(const char sendBuf[])
{
sendto(m_sockClient, sendBuf, strlen(sendBuf), 0, (sockaddr*)&m_TargetServer, sizeof(m_TargetServer));
}
void CClient::RecMsg()
{
char recBuf[1025];
while (1)
{
//std::cout << "Begin rec...(client)" << std::endl;
int len = recvfrom(m_sockClient, recBuf, 1024, 0, 0, 0);
if (len > 0)
{
recBuf[len] = '\0';
std::cout << "Server say: " << recBuf << std::endl;
}
}
}
CClient::~CClient()
{
closesocket(m_sockClient);
WSACleanup();
}
2.3客户端主函数
#include
#include
#include
#include "CClient.h"
using namespace std;
int main()
{
CClient client_UDP;
thread RecProc(&CClient::RecMsg, &client_UDP);
while (1)
{
//cout << "Please input content:" << endl;
string content;
cin >> content;
client_UDP.SendMsg(content.c_str());
}
RecProc.join();
cout << "I love china!" << endl;
system("pause");
return 0;
}
3.效果图(win7+VS2017)
3.1服务端
3.2客户端
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本文名称：C++基于socketUDP网络编程怎么实现聊天室功能-创新互联
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