VC++ UDP网络控制台程序

原文：http://blog.csdn.net/ccf19881030/article/details/16991215

我在server里面分别添加了发送，在clent添加了接收的部分附在最后面.

采用的是VC2008,控制台应用程序，使用UDP编写。

1、服务端代码

//UDPServer.cpp

[cpp] view plain copy

1. #include <WinSock2.h>  
2. #include <stdio.h>  
3.   
4. #define SERVERPORT 6000 //服务端口号  
5.   
6. #pragma comment(lib, "WS2_32.lib");  
7.   
8. int main(int argc, char *argv[])  
9. {  
10.     //加载套接字库  
11.     WORD wVersionRequested;  
12.     WSADATA wsaData;  
13.     int err;  
14.   
15.     wVersionRequested = MAKEWORD( 2, 2 );  
16.       
17.     err = WSAStartup( wVersionRequested, &wsaData );  
18.     if ( err != 0 ) {  
19.         /* Tell the user that we could not find a usable */  
20.         /* WinSock DLL.                                  */  
21.         return -1;  
22.     }  
23.   
24.     /* Confirm that the WinSock DLL supports 2.2.*/  
25.     /* Note that if the DLL supports versions greater    */  
26.     /* than 2.2 in addition to 2.2, it will still return */  
27.     /* 2.2 in wVersion since that is the version we      */  
28.     /* requested.                                        */  
29.   
30.     if ( LOBYTE( wsaData.wVersion ) != 2 ||  
31.         HIBYTE( wsaData.wVersion ) != 2 ) {  
32.             /* Tell the user that we could not find a usable */  
33.             /* WinSock DLL.                                  */  
34.             WSACleanup( );  
35.             return -1;   
36.     }  
37.   
38.     /* The WinSock DLL is acceptable. Proceed. */  
39.     //创建套接字  
40.     SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, 0);  
41.     if (INVALID_SOCKET == sockServer)  
42.     {  
43.         printf("socket() called failed! The error code is: %d\n", WSAGetLastError());  
44.         return -1;  
45.     }  
46.     else  
47.     {  
48.         printf("socket() called succesful!\n");  
49.     }  
50.       
51.     //服务器端  
52.     SOCKADDR_IN addrServer;  
53.     addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  
54.     addrServer.sin_family = AF_INET;  
55.     addrServer.sin_port = htons(SERVERPORT);  
56.   
57.     //绑定套接字  
58.     err = bind(sockServer, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));  
59.     if (SOCKET_ERROR == err)  
60.     {  
61.         printf("bind() called failed! The error code is: %d\n", WSAGetLastError());  
62.         return -1;  
63.     }  
64.     else  
65.     {  
66.         printf("bind() called successful!\n");  
67.     }  
68.   
69.     //等待并接收数据  
70.     SOCKADDR_IN addrClient;//用于接收发送端的地址信息  
71.     int len = sizeof(SOCKADDR);  
72.     char recvBuf[100];  
73.     recvfrom(sockServer, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);  
74.     //打印接收到的数据  
75.     printf("receive data:%s from client [%s,%d]", recvBuf, inet_ntoa(addrClient.sin_addr), addrClient.sin_port);  
76.       
77.     //关闭套接字  
78.     closesocket(sockServer);  
79.       
80.     //终止套接字库的使用  
81.     WSACleanup();  
82.       
83.     return 0;  
84. }  

2、客户端代码

//UDPClient.cpp

[cpp] view plain copy

1. #include <WinSock2.h>  
2. #include <stdio.h>  
3.   
4. #define SERVERPORT 6000 //服务端口号  
5.   
6. #pragma comment(lib, "WS2_32.lib");  
7.   
8. int main(int argc, char *argv[])  
9. {  
10.     //加载套接字库  
11.     WORD wVersionRequested;  
12.     WSADATA wsaData;  
13.     int err;  
14.   
15.     wVersionRequested = MAKEWORD( 2, 2 );  
16.   
17.     err = WSAStartup( wVersionRequested, &wsaData );  
18.     if ( err != 0 ) {  
19.         /* Tell the user that we could not find a usable */  
20.         /* WinSock DLL.                                  */  
21.         return -1;  
22.     }  
23.   
24.     /* Confirm that the WinSock DLL supports 2.2.*/  
25.     /* Note that if the DLL supports versions greater    */  
26.     /* than 2.2 in addition to 2.2, it will still return */  
27.     /* 2.2 in wVersion since that is the version we      */  
28.     /* requested.                                        */  
29.   
30.     if ( LOBYTE( wsaData.wVersion ) != 2 ||  
31.         HIBYTE( wsaData.wVersion ) != 2 ) {  
32.             /* Tell the user that we could not find a usable */  
33.             /* WinSock DLL.                                  */  
34.             WSACleanup( );  
35.             return -1;   
36.     }  
37.       
38.     //创建套接字  
39.     SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0);  
40.     if (INVALID_SOCKET == sockClient)  
41.     {  
42.         printf("socket() called failed! The error code is: %d\n", WSAGetLastError());  
43.         return -1;  
44.     }  
45.     else  
46.     {  
47.         printf("socket() called succesful!\n");  
48.     }  
49.   
50.     SOCKADDR_IN addrServer;  
51.     addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");  
52.     addrServer.sin_family = AF_INET;  
53.     addrServer.sin_port = htons(SERVERPORT);  
54.       
55.     //发送数据  
56.     err = sendto(sockClient, "Hello", strlen("Hello")+1, 0, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));  
57.     if (SOCKET_ERROR == err)  
58.     {  
59.         printf("sendto() called failed! The error code is: %s\n", WSAGetLastError());  
60.         return -1;  
61.     }  
62.     else  
63.     {  
64.         printf("sendto() called successful!\n");  
65.     }  
66.   
67.     //关闭套接字  
68.     closesocket(sockClient);  
69.   
70.     //终止套接字库的使用  
71.     WSACleanup();  
72.   
73.     return 0;  
74. }  

先启动服务端UDPServer程序，再启动客户端UDPClient程序，运行结果如下：

服务端UDPServer

客户端UDPClient

此时服务端UDPServer的结果会发生变化，会受到客户端发送过来的数据，如下图所示：

参考资料：

1、《VC++深入详解》 第14章网络编程 ，孙鑫主编

2、MSDN帮助文档

#include <WinSock2.h>#include <stdio.h>#define SERVERPORT 6000//服务端口号#pragma comment(lib, "WS2_32.lib");int main(int argc, char *argv[]){//加载套接字库WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 2, 2 );err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 ) {/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */return -1;}/* Confirm that the WinSock DLL supports 2.2.*//* Note that if the DLL supports versions greater    *//* than 2.2 in addition to 2.2, it will still return *//* 2.2 in wVersion since that is the version we      *//* requested.                                        */if ( LOBYTE( wsaData.wVersion ) != 2 ||HIBYTE( wsaData.wVersion ) != 2 ) {/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */WSACleanup( );return -1; }/* The WinSock DLL is acceptable. Proceed. *///创建套接字SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, 0);if (INVALID_SOCKET == sockServer){printf("socket() called failed! The error code is: %d\n", WSAGetLastError());return -1;}else{printf("socket() called succesful!\n");}//服务器端SOCKADDR_IN addrServer;addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);addrServer.sin_family = AF_INET;addrServer.sin_port = htons(SERVERPORT);//绑定套接字err = bind(sockServer, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));if (SOCKET_ERROR == err){printf("bind() called failed! The error code is: %d\n", WSAGetLastError());return -1;}else{printf("bind() called successful!\n");}//等待并接收数据SOCKADDR_IN addrClient;//用于接收发送端的地址信息int len = sizeof(SOCKADDR);char recvBuf[100];recvfrom(sockServer, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);//打印接收到的数据printf("receive data:%s from client [%s,%d]", recvBuf, inet_ntoa(addrClient.sin_addr), addrClient.sin_port);//发送数据err = sendto(sockServer, "Hello Client", strlen("Hello Client")+1, 0, (SOCKADDR*)&addrClient, sizeof(SOCKADDR));if (SOCKET_ERROR == err){printf("sendto() called failed! The error code is: %s\n", WSAGetLastError());return -1;}else{printf("sendto() called successful!\n");}//关闭套接字closesocket(sockServer);//终止套接字库的使用WSACleanup();return 0;}

clent端：

#include <WinSock2.h>#include <stdio.h>#define SERVERPORT 6000//服务端口号#pragma comment(lib, "WS2_32.lib");int main(int argc, char *argv[]){//加载套接字库WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 2, 2 );err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 ) {/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */return -1;}/* Confirm that the WinSock DLL supports 2.2.*//* Note that if the DLL supports versions greater    *//* than 2.2 in addition to 2.2, it will still return *//* 2.2 in wVersion since that is the version we      *//* requested.                                        */if ( LOBYTE( wsaData.wVersion ) != 2 ||HIBYTE( wsaData.wVersion ) != 2 ) {/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */WSACleanup( );return -1; }//创建套接字SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0);if (INVALID_SOCKET == sockClient){printf("socket() called failed! The error code is: %d\n", WSAGetLastError());return -1;}else{printf("socket() called succesful!\n");}SOCKADDR_IN addrServer;addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");addrServer.sin_family = AF_INET;addrServer.sin_port = htons(SERVERPORT);//发送数据err = sendto(sockClient, "Hello server", strlen("Hello server")+1, 0, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));if (SOCKET_ERROR == err){printf("sendto() called failed! The error code is: %s\n", WSAGetLastError());return -1;}else{printf("sendto() called successful!\n");}int len = sizeof(SOCKADDR);char recvBuf[100];recvfrom(sockClient, recvBuf, 100, 0, (SOCKADDR*)&addrServer, &len);//打印接收到的数据printf("receive data:%s from client [%s,%d]", recvBuf, inet_ntoa(addrServer.sin_addr), addrServer.sin_port);//关闭套接字closesocket(sockClient);//终止套接字库的使用WSACleanup();return 0;}