Windows socket 代码例子

最新推荐文章于 2023-04-02 17:49:40 发布

原创最新推荐文章于 2023-04-02 17:49:40 发布 · 479 阅读

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CC 4.0 BY-SA版权

文章标签：

#socket #windows #server #stream #tcp

本文介绍了一个使用Winsock实现的简单客户端与服务端通信的示例代码。客户端连接到本地服务端口50000并接收数据；服务端监听该端口，并向客户端发送其IP地址。

十分简单的客户端

//coffeexp
#include "stdafx.h"
#include <winsock2.h>
using namespace std;

UINT startClient(LPVOID );
int _tmain()
{
   AfxBeginThread(startClient,0);
   getchar();
   return 0;
}

UINT startClient(LPVOID pParam)
{
   cout<<"client started!"<<endl;
   SOCKET fd;
   WSADATA wsaData;
   sockaddr_in server_addr;
   char recvbuff[1024];
   memset(recvbuff,0,1024);

   int wsaret=WSAStartup(0x101,&wsaData);
   if(wsaret!=0)
       return 0;
   server_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
   server_addr.sin_family=AF_INET;
   server_addr.sin_port=htons((u_short)50000);

   fd=socket(AF_INET,SOCK_STREAM,0);
   if(fd==INVALID_SOCKET)
       cout<<"socket create error"<<endl;
   if(connect(fd,(sockaddr*)&server_addr,sizeof(server_addr)))
   {
       cout<<"connect error"<<endl;
       closesocket(fd);
       return 0;
   }
   if(recv(fd,recvbuff,sizeof(recvbuff),0))
   {
   CString aa(recvbuff);
   wcout<<"Data is: "<<aa<<endl;
   }
   closesocket(fd);
   WSACleanup();

   return 0;
}

服务端程序：
#include "stdafx.h"
#include <winsock2.h>
using namespace std;

UINT ServerThread(LPVOID );

int _tmain()
{
    AfxBeginThread(ServerThread,0);
    getchar();
    return 0;
}
UINT ServerThread(LPVOID pParam)
{
    cout<<"Starting TCP server...."<<endl;
    SOCKET server;
    WSADATA wsaData;
    sockaddr_in local;
    int wsaret=WSAStartup(0x101,&wsaData);
    if(wsaret!=0)
        return 0;
    local.sin_family=AF_INET;
    local.sin_addr.s_addr=INADDR_ANY;
    local.sin_port=htons(50000);
    server=socket(AF_INET,SOCK_STREAM,0);
    if(server==INVALID_SOCKET)
        return 0;
    if(bind(server,(sockaddr*)&local,sizeof(local))!=0)
        return 0;
    if(listen(server,2)!=0)
        return 0;
    SOCKET client;
    sockaddr_in from;
    int length=sizeof(from);
    while(true)
    {
        CString s(L"you ip is :");
        client =accept(server,(sockaddr*)&from,&length);
        s+=inet_ntoa(from.sin_addr);
        wcout<<(LPCTSTR)s<<endl;
        send(client,(char*)(LPCTSTR)s,s.GetLength(),0);
        cout<<"message had send to "<<inet_ntoa(from.sin_addr)<<endl;
        closesocket(client);
    }
    closesocket(server);
    WSACleanup();

    return 0;
}

这里面有个有趣的问题，将S正确发到client，但client打印时只能显示第一个即"y",这就是著名的unicode ascii的转换。写在这里留个记念。