【发布时间】：2010-11-24 06:05:37
【问题描述】：
这是我的第二次尝试，我编写了一个服务器应用程序，如下所示，它输出客户端发送的任何内容。我有一个 server.exe 版本，它使用INADDR_ANY 监听任何内容，完成后，如果我指定客户端连接到本地主机，我可以使用我的客户端并连接到服务器（一切正常）。
但是如果我使用自己的 IP 地址而不是 localhost 作为客户端，我无法连接到服务器？我不应该能够以这种方式连接到服务器吗？。
我使用了另一个 server.exe，它被硬编码以使用我的 IP 地址而没有 INADDR_ANY，但它无法 bind() 或 listen() 传入连接。我对如何继续感到困惑。
（我在同一台机器上运行服务器和客户端，这是个问题吗？）
服务器
#include <iostream>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
using namespace std;
#define PORT 3490
#define IP "118.93.0.164"
#define BACKLOG 10
const int winsockversion = 2;
int main(void){
WSADATA wsadata;
if ( (WSAStartup(MAKEWORD(winsockversion,0),&wsadata)) == 0){
cout<<"-WSAStartup Initialized." << endl;
struct sockaddr_in serv;
memset(&serv,0,sizeof serv);
serv.sin_family = AF_INET;
serv.sin_port = htons(PORT);
serv.sin_addr.s_addr = inet_addr(IP);//INADDR_ANY;//inet_addr(IP);
//---------------------------------------
struct addrinfo serv_addrinfo;
serv_addrinfo.ai_family = AF_INET;
serv_addrinfo.ai_socktype = SOCK_STREAM;
serv_addrinfo.ai_protocol = IPPROTO_TCP;
serv_addrinfo.ai_addrlen = sizeof(serv);
serv_addrinfo.ai_addr = (sockaddr*)&serv;
//---------------------------------------
SOCKET serv_con;
serv_con = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if (serv_con != INVALID_SOCKET){
cout<<"-Server Socket created." << endl;
}
if (bind(serv_con,serv_addrinfo.ai_addr,serv_addrinfo.ai_addrlen) != -1){
cout<<"-Binding Successful." << endl;
}
if( listen(serv_con,BACKLOG) != -1){
cout<<"-Listening for incoming connections." << endl;
}
//--------------------------------------------------------------------
SOCKET recv_socket;
struct sockaddr_in client_info;
int client_info_size = sizeof(client_info);
char *con_addr = inet_ntoa(client_info.sin_addr);
recv_socket = accept(serv_con,(sockaddr*)&client_info,&client_info_size);
if( recv_socket != INVALID_SOCKET ){
cout<<"-Connection Established!. " << endl;
cout<<"-Connected to: [" << con_addr << "] " << endl;
//----------------------------------------------------------------------
char buffer[80];
int bytes_in;
while(true){
bytes_in = recv(recv_socket,buffer,sizeof(buffer),0);
if ( bytes_in > 0 ){
cout<<"[" << con_addr << "]" << buffer << endl;
}
if (bytes_in == 0 ){
cout<<"[" << con_addr << "] has disconnected." << endl;
break;
}
if (bytes_in == -1 ){
cout<<"-Possible Abrupt disconnecton from [" << con_addr << "]" << endl;
break;
}
}
closesocket(recv_socket);
closesocket(serv_con);
}
}else{
cout<<"-WSAStartup Initialization failed." << endl;
}
if( WSACleanup()!= -1){
cout<<"-WSACleanp Successful." << endl;
}
WSAGetLastError();
return 0;
}
客户
/*client*/
#define _WIN32_WINNT 0x501
#include <iostream>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
using namespace std;
#define PORT "3490"
#define SERVER "118.93.0.164" // and localhost
const int winsockVersion = 2;
int main(void){
WSADATA wsadata;
if ( (WSAStartup(MAKEWORD(2,0),&wsadata)) == 0){
cout<<"-WSAStartup Initialized." << endl;
struct addrinfo hints, *res;
int sockfd;
memset(&hints,0,sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(SERVER,PORT,&hints,&res) != 0){
cout<<"-getaddrinfo unsuccessful." << endl;
}
if ( (sockfd = socket(res->ai_family,res->ai_socktype,res->ai_protocol)) == -1 ){
cout<<"-Unable to create socket." << endl;
}
if ( (connect(sockfd,res->ai_addr,res->ai_addrlen)) != -1 ){
cout<<"-Connection Established." << endl;
}
cout<<"-Client connecting to: " << res->ai_addr << endl;
while(true){
string text_buff;
cout<<"Enter text: ";
getline(cin,text_buff);
if( (send(sockfd,text_buff.c_str(),text_buff.length()+1,0)) != -1 ){
cout<<"-text_buff sent!." << endl;
}
}
}else{
cout<<"-WSAStartup Initialization failed." << endl;
if(WSACleanup()!=0){
cout<<"-WSACleanup Successful." << endl;
}else{
cout<<"-WSACleanup Failed." << endl;
}
}
return 0;
}
【问题讨论】：
-
在同一台机器上运行服务器和客户端绝对不是问题。我怀疑您使用的 IP 地址并不是您机器拥有的地址。你的服务器有公共地址吗？还是私人地址？您确定您提供的是 ipconfig 命令报告的 IP 地址吗？
-
你是对的它不是我的机器IP地址它是我的ISP提供的IP地址。我通过 wifi 连接了多台计算机，我试图连接到我的外部 IP（如果这是我的 ISP 提供的 IP 地址的名称？）。
-
如何连接到给定 IP 地址的 ISP 并解析服务器运行的本地地址？ （抱歉，还不熟悉行话）。
标签： c++ gcc binding client-server winsock