大家好,我使用Win7以及Microsoft Visual Studio 2010 正在进行UDP相关的实验 我写了两个C++程式码 一个是Server,一个是Client 但我不确定可不可以这样做,所以想来问一下 我写好了两个程式码,并且在同一台电脑里面执行 是可以的,程式码当中也有显示连线的Client 我想问的是,我有办法在一台电脑开启Server的程式码,另一台电脑开启Client的程式码, 然後进行封包传输吗? 实验需要相隔两地,两地可能是台北跟台南或者甚至到美国 实验当中需要测试真实的网路延迟,我想使用封包传过去跟接收回来的时间 有人愿意提供我美国主机进行测试 但我自己在实验室中,利用两台电脑,一台开起Server另一台开起Client,却无法进行传输 所以想请问一下是本来就无法这样在两台电脑各开一个程式码然後分开进行吗? 在此附上程式码: UDP Server: ///server//// #include "stdafx.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include<winsock2.h> #include <iostream> #include <sys/types.h> using namespace std; #pragma comment(lib,"ws2_32.lib") //Winsock Library #define SERVER_PORT 8888 #define BUFLEN 512 int _tmain(int argc, _TCHAR* argv[]){ struct sockaddr_in addr; /* address of this service *///for one port SOCKET s; int length_addr; char buf[BUFLEN]; int sendbol; int receivebol; ///一些初始设定///// WSADATA wsa; printf("\nInitializing Winsock..."); if (WSAStartup(MAKEWORD(2,2),&wsa) != 0){ printf("Failed. Error Code : %d",WSAGetLastError()); exit(EXIT_FAILURE); } printf("Initialized.\n"); if ((s = socket(AF_INET, SOCK_DGRAM, 0)) <0){ perror ("socket failed"); exit(EXIT_FAILURE); } memset(&addr,'\0',sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.s_addr = htonl(INADDR_ANY); addr.sin_port = htons(SERVER_PORT); if (bind(s,(struct sockaddr*)&addr,sizeof(addr)) <0) { perror ("bind failed\n"); exit(1); } length_addr=sizeof(addr); printf("Server is ready to receive !!\n"); printf("Can strike Cntrl-c to stop Server >>\n"); memset(buf,'\0', BUFLEN); ////开始接收/////// while(1){ receivebol=recvfrom(s,buf,BUFLEN,0,(struct sockaddr*)&addr, &length_addr);(跟上一行是同一行) if (receivebol<0){ perror ("could not read datagram!!"); continue; } printf("Received data form %s:%d\n",inet_ntoa(addr.sin_addr), htons(addr.sin_port));(跟上一行是同一行) printf("%s\n",buf); sendbol=sendto(s,buf,BUFLEN,0, (struct sockaddr*)&addr,length_addr); if (sendbol<0){ perror("Could not send datagram!!\n"); continue; } printf("Can Strike Crtl-c to stop Server >>\n"); } closesocket(s); WSACleanup(); system("pause"); return 0; } UDP Client: ///client///// #include "stdafx.h" #include <stdio.h> #include <stdlib.h> #include <signal.h> #include<winsock2.h> #include <fcntl.h> #include <string.h> #include <iostream> #pragma comment(lib,"ws2_32.lib") using namespace std; #define SERV_PORT 8888 //send to server #define BUFLEN 512 #define SERVER "127.0.0.1" int main(int argc, char **argv){ struct sockaddr_in server;//one port struct hostent *hp; /* holds IP address of server */ SOCKET s; int size_server; char data; char buf[255]; int sendbol, receivebol; WSADATA wsa; //一些初始设定/// printf("\nInitializing Winsock..."); if (WSAStartup(MAKEWORD(2,2),&wsa) != 0){ printf("Failed. Error Code : %d",WSAGetLastError()); exit(EXIT_FAILURE); } printf("Initialized.\n"); //create socket if ( (s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR){ printf("socket() failed with error code : %d" , WSAGetLastError()); exit(EXIT_FAILURE); } server.sin_family = AF_INET; server.sin_addr.s_addr = htonl(INADDR_ANY); server.sin_addr.s_addr=inet_addr(SERVER); server.sin_port = htons(SERV_PORT); size_server=sizeof(server); ///////开始发送跟接收/////// while(1){ sprintf(buf,"%f",0.5678); cout <<buf<< endl; sendbol=sendto(s,buf,BUFLEN,0,(struct sockaddr*)&server,size_server); if(sendbol<0) { perror("sned to server error !"); exit(1); } else{ printf("bytes have been sended\n"); } receivebol=recvfrom(s,buf,BUFLEN,0,(struct sockaddr*)&server,&size_server); if (receivebol< 0) { printf("receive failed: %d\n" , WSAGetLastError()); exit (1); } else{ printf("bytes have been received\n"); printf("%s\n", buf); } } closesocket(s); WSACleanup(); system("pause"); return 0; } --

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