C++ 创建基本Winsock应用程序时出错
我在MS的指导下构建了一个基本的winsock应用程序,问题是,服务器和客户端都可以编译,但我无法建立连接,因为客户端完全消失了。我在VS 2017 15.7.5中安装了Windows 10 SDK(10.0.17134.0)。有什么问题吗 客户端代码:C++ 创建基本Winsock应用程序时出错,c++,chat,winsock,C++,Chat,Winsock,我在MS的指导下构建了一个基本的winsock应用程序,问题是,服务器和客户端都可以编译,但我无法建立连接,因为客户端完全消失了。我在VS 2017 15.7.5中安装了Windows 10 SDK(10.0.17134.0)。有什么问题吗 客户端代码: #include "stdafx.h" #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <winsock2.h> #include <ws2t
#include "stdafx.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
using namespace std;
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
const char *sendbuf = "this is a test";
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if (iResult != 0) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Attempt to connect to an address until one succeeds
for (ptr = result; ptr != NULL; ptr = ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Connect to server.
iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
// Send an initial buffer
iResult = send(ConnectSocket, sendbuf, (int)strlen(sendbuf), 0);
if (iResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
printf("Bytes Sent: %ld\n", iResult);
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
// Receive until the peer closes the connection
do {
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
if (iResult > 0)
printf("Bytes received: %d\n", iResult);
else if (iResult == 0)
printf("Connection closed\n");
else
printf("recv failed with error: %d\n", WSAGetLastError());
} while (iResult > 0);
// cleanup
closesocket(ConnectSocket);
WSACleanup();
cin.get();
return 0;
}
#包括“stdafx.h”
#定义WIN32_精益_和_平均值
#包括
#包括
#包括
#包括
#包括
#包括
使用名称空间std;
//需要链接到Ws2_32.lib、Mswsock.lib和Advapi32.lib
#pragma注释(lib,“Ws2_32.lib”)
#pragma注释(lib,“Mswsock.lib”)
#pragma注释(lib,“AdvApi32.lib”)
#定义默认值\u BUFLEN 512
#定义默认_端口“27015”
内部cdecl主(内部argc,字符**argv)
{
WSADATA WSADATA;
SOCKET ConnectSocket=无效的_套接字;
struct addrinfo*result=NULL,
*ptr=NULL,
提示;
const char*sendbuf=“这是一个测试”;
char recvbuf[默认值];
国际结果;
int recvbuflen=默认值;
//验证参数
如果(argc!=2){
printf(“用法:%s服务器名称\n”,argv[0]);
返回1;
}
//初始化Winsock
iResult=WSAStartup(MAKEWORD(2,2)和wsaData);
如果(iResult!=0){
printf(“WSAStartup失败,错误:%d\n”,iResult);
返回1;
}
零内存(&提示,sizeof(提示));
hits.ai_family=AF_unsec;
hits.ai_socktype=SOCK_流;
hits.ai_protocol=IPPROTO_TCP;
//解析服务器地址和端口
iResult=getaddrinfo(argv[1],默认端口、提示和结果);
如果(iResult!=0){
printf(“getaddrinfo失败,错误:%d\n”,iResult);
WSACleanup();
返回1;
}
//尝试连接到某个地址,直到连接成功
for(ptr=result;ptr!=NULL;ptr=ptr->ai_next){
//创建用于连接到服务器的套接字
连接插座=插座(ptr->ai_系列,ptr->ai_插座类型,
ptr->ai_协议);
if(ConnectSocket==无效的_套接字){
printf(“套接字失败,错误:%ld\n”,WSAGetLastError());
WSACleanup();
返回1;
}
//连接到服务器。
iResult=connect(ConnectSocket,ptr->ai_addr,(int)ptr->ai_addrlen);
if(iResult==SOCKET\u错误){
闭合插座(连接插座);
ConnectSocket=无效的_套接字;
继续;
}
打破
}
freeaddrinfo(结果);
if(ConnectSocket==无效的_套接字){
printf(“无法连接到服务器!\n”);
WSACleanup();
返回1;
}
//发送初始缓冲区
iResult=send(ConnectSocket,sendbuf,(int)strlen(sendbuf),0);
if(iResult==SOCKET\u错误){
printf(“发送失败,错误:%d\n”,WSAGetLastError());
闭合插座(连接插座);
WSACleanup();
返回1;
}
printf(“发送的字节数:%ld\n”,iResult);
//由于不再发送数据,请关闭连接
iResult=关机(ConnectSocket,SD_发送);
if(iResult==SOCKET\u错误){
printf(“关闭失败,错误:%d\n”,WSAGetLastError());
闭合插座(连接插座);
WSACleanup();
返回1;
}
//接收,直到对等方关闭连接
做{
iResult=recv(ConnectSocket,recvbuf,recvbuflen,0);
如果(iResult>0)
printf(“收到的字节数:%d\n”,iResult);
else if(iResult==0)
printf(“连接关闭\n”);
其他的
printf(“recv失败,错误:%d\n”,WSAGetLastError());
}而(iResult>0);
//清理
闭合插座(连接插座);
WSACleanup();
cin.get();
返回0;
}
服务器代码:
#include "stdafx.h"
#undef UNICODE
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
// Need to link with Ws2_32.lib
#pragma comment (lib, "Ws2_32.lib")
// #pragma comment (lib, "Mswsock.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(void)
{
WSADATA wsaData;
int iResult;
SOCKET ListenSocket = INVALID_SOCKET;
SOCKET ClientSocket = INVALID_SOCKET;
struct addrinfo *result = NULL;
struct addrinfo hints;
int iSendResult;
char recvbuf[DEFAULT_BUFLEN];
int recvbuflen = DEFAULT_BUFLEN;
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), & wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory(& hints, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
// Resolve the server address and port
iResult = getaddrinfo(NULL, DEFAULT_PORT, & hints, & result);
if (iResult != 0) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Create a SOCKET for connecting to server
ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
if (ListenSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
freeaddrinfo(result);
WSACleanup();
return 1;
}
// Setup the TCP listening socket
iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);
if (iResult == SOCKET_ERROR) {
printf("bind failed with error: %d\n", WSAGetLastError());
freeaddrinfo(result);
closesocket(ListenSocket);
WSACleanup();
return 1;
}
freeaddrinfo(result);
iResult = listen(ListenSocket, SOMAXCONN);
if (iResult == SOCKET_ERROR) {
printf("listen failed with error: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
// Accept a client socket
ClientSocket = accept(ListenSocket, NULL, NULL);
if (ClientSocket == INVALID_SOCKET) {
printf("accept failed with error: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
// No longer need server socket
closesocket(ListenSocket);
// Receive until the peer shuts down the connection
do {
iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);
if (iResult > 0) {
printf("Bytes received: %d\n", iResult);
// Echo the buffer back to the sender
iSendResult = send(ClientSocket, recvbuf, iResult, 0);
if (iSendResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}
printf("Bytes sent: %d\n", iSendResult);
}
else if (iResult == 0)
printf("Connection closing...\n");
else {
printf("recv failed with error: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}
} while (iResult > 0);
// shutdown the connection since we're done
iResult = shutdown(ClientSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}
// cleanup
closesocket(ClientSocket);
WSACleanup();
return 0;
}
#包括“stdafx.h”
#未定义UNICODE
#定义WIN32_精益_和_平均值
#包括
#包括
#包括
#包括
#包括
//需要链接到Ws2_32.lib
#pragma注释(lib,“Ws2_32.lib”)
//#pragma注释(lib,“Mswsock.lib”)
#定义默认值\u BUFLEN 512
#定义默认_端口“27015”
内部cdecl干管(无效)
{
WSADATA WSADATA;
国际结果;
套接字ListenSocket=无效的\u套接字;
套接字ClientSocket=无效的\u套接字;
struct addrinfo*result=NULL;
结构addrinfo提示;
int iSendResult;
char recvbuf[默认值];
int recvbuflen=默认值;
//初始化Winsock
iResult=WSAStartup(MAKEWORD(2,2)和wsaData);
如果(iResult!=0){
printf(“WSAStartup失败,错误:%d\n”,iResult);
返回1;
}
零内存(&提示,sizeof(提示));
hits.ai_family=AF_INET;
hits.ai_socktype=SOCK_流;
hits.ai_protocol=IPPROTO_TCP;
hits.ai_flags=ai_被动;
//解析服务器地址和端口
iResult=getaddrinfo(NULL、默认端口、提示和结果);
如果(iResult!=0){
printf(“getaddrinfo失败,错误:%d\n”,iResult);
WSACleanup();
返回1;
}
//创建用于连接到服务器的套接字
ListenSocket=socket(结果->ai_族,结果->ai_socktype,结果->ai_协议);
if(ListenSocket==无效的_套接字){
printf(“套接字失败,错误:%ld\n”,WSAGetLastError());
freeaddrinfo(结果);
WSACleanup();
返回1;
}
//设置TCP侦听套接字
iResult=bind(ListenSocket,result->ai_addr,(int)result->ai_addrlen);
if(iResult==SOCKET\u错误){
printf(“绑定失败,错误:%d\n”,WSAGetLastError());
freeaddrinfo(结果);
闭合插座(ListenSocket);
WSACleanup();
返回1;
}
freeaddrinfo(结果);
iResult=侦听(ListenSocket,SOMAXCONN);
if(iResult==SOCKET\u错误){
printf(“侦听失败,错误为:%d\n”,WSAGetLastError());
闭合插座(ListenSocket);
WSACleanup();
返回1;
}
//接受客户端套接字
ClientSocket=accept(ListenSocket,NULL,NULL);
if(ClientSocket==无效的_SOCKET){