我正在基于c ++控制台制作服务器，客户端应用程序。
到目前为止我做了什么：
但是我无法弄清楚，在处理从客户端收到的消息时，我怎样才能让服务器充当客户端向客户端发送消息？
人们也可以用它作为例子：D
我还会发布代码的一些部分：
服务器：
#include "stdafx.h"
using namespace std;
//our main function
void main()
{
int numClients;
long antwoord;
char chatname[100];
char bericht[250]; //messages
char sbericht[250]; //smessages
//here we set the Winsock-DLL to start
WSAData wsaData;
WORD DLLVERSION;
DLLVERSION = MAKEWORD(2,1);
//here the Winsock-DLL will be started with WSAStartup
//version of the DLL
antwoord = WSAStartup(DLLVERSION, &wsaData);
if(antwoord != 0)
{
WSACleanup();
exit(1);
}
else
{
cout << "WSA started successfully" <<endl;
cout << "The status: \n" << wsaData.szSystemStatus <<endl;
}
//the DLL is started
//structure of our socket is being created
SOCKADDR_IN addr;
//addr is our struct
int addrlen = sizeof(addr);
//socket sListen - will listen to incoming connections
SOCKET sListen;
//socket sConnect - will be operating if a connection is found.
SOCKET sConnect;
//setup of our sockets
//opgezocht op internet - AF_INET bekend dat het lid is van de internet familie
//Sock_STREAM betekenend dat onze socket een verbinding georiënteerde socket is.
sConnect = socket(AF_INET,SOCK_STREAM,NULL);
//now we have setup our struct
//inet_addr is our IP adres of our socket(it will be the localhost ip
//that will be 127.0.0.1
addr.sin_addr.s_addr = inet_addr("192.168.1.103");
//retype of the family
addr.sin_family = AF_INET;
//now the server has the ip(127.0.0.1)
//and the port number (4444)
addr.sin_port = htons(4444);
//here we will define the setup for the sListen-socket
sListen = socket(AF_INET,SOCK_STREAM,NULL);
if (sConnect == INVALID_SOCKET)
{
cout << "Error at socket(): \n" << WSAGetLastError() <<endl;
WSACleanup();
}
else
{
cout << "Connect socket() is OK!" <<endl;
}
if(sListen == INVALID_SOCKET)
{
cout << "Error at socket(): \n" << WSAGetLastError() <<endl;
WSACleanup();
}
else
{
cout << "Listen socket() is OK!" <<endl;
}
//here the sListen-socket will be bind
//we say that the socket has the IP adress of (127.0.0.1) and is on port (4444)
//we let the socket become the struct "addr"
if(bind(sListen, (SOCKADDR*)&addr, sizeof(addr)) == SOCKET_ERROR)
{
cout << "bind() failed: \n" << WSAGetLastError() <<endl;
WSACleanup();
exit(1);
}
else{
cout << "bind() is OK!" <<endl;
}
//here we will tell what the server must do when a connection is found
//therefor we will create an endless loop
cout << "Waiting for a incoming connection..." <<endl;
for(;;)
{
//now we let the socket listen for incoming connections
//SOMAXCOMM heeft het nut dat het dan voordurend luisterd naar inkomende verbindingen zonder limiet
listen(sListen, SOMAXCONN);
while(numClients < SOMAXCONN)
{
//if a connection is found: show the message!
if(sConnect = accept(sListen, (SOCKADDR*)&addr, &addrlen))
{
cout << "A Connection was found!" <<endl;
antwoord = send(sConnect, "Welcome to our chat:", 21,NULL);
if(antwoord > 1)
{
antwoord = recv(sConnect, sbericht, sizeof(sbericht), NULL);
antwoord = recv(sConnect, chatname, sizeof(chatname), NULL);
while(antwoord = recv(sConnect, sbericht, sizeof(sbericht), NULL) && (antwoord = recv(sConnect, sbericht, sizeof(sbericht), NULL)) )
{
antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL);
antwoord = send(sConnect, chatname, sizeof(chatname), NULL);
}
}
else
{
cout << "The connection to the client has been lost... \n" << "please exit the server." <<endl;
break;
}
numClients++;
}
}
}
}
客户端：
// ChatServer.cpp : Defines the entry point for the console application.
//
//include of the stdafx.h file where importent files are being included
#include "stdafx.h"
using namespace std;
void smessage()
{
}
//our main function
int main()
{
//here we set the Winsock-DLL to start
string bevestiging;
char chatname[100];
char bericht[250];
char sbericht[250];
string strbericht;
string strsbericht;
long antwoord;
//here the Winsock-DLL will be started with WSAStartup
//version of the DLL
WSAData wsaData;
WORD DLLVERSION;
DLLVERSION = MAKEWORD(2,1);
antwoord = WSAStartup(DLLVERSION, &wsaData);
if(antwoord != 0)
{
exit(1);
}
else
{
cout << "WSA started successfully" <<endl;
cout << "The status: \n" << wsaData.szSystemStatus <<endl;
}
SOCKADDR_IN addr;
int addrlen = sizeof(addr);
SOCKET sConnect;
sConnect = socket(AF_INET, SOCK_STREAM, NULL);
if (sConnect == INVALID_SOCKET)
{
cout << "Error at socket(): \n" << WSAGetLastError() <<endl;
}
else
{
cout << "socket() is OK!\n" <<endl;
}
addr.sin_addr.s_addr = inet_addr("192.168.1.103");
addr.sin_family = AF_INET;
addr.sin_port = htons(4444);
cout << "What is your chat name?" <<endl;
cin.getline(chatname, 100);
cout << "Do you want to connect to the server? [Y/N]" <<endl;
cin >> bevestiging;
if (bevestiging == "N")
{
exit(1);
}
else
{
if(bevestiging == "Y")
{
connect(sConnect, (SOCKADDR*)&addr, sizeof(addr));
antwoord = recv(sConnect, bericht, sizeof(bericht), NULL);
strbericht = bericht;
cout << strbericht << chatname <<endl;
while(true)
{
if(antwoord > 1)
{
cin.clear();
cin.sync();
cout << chatname << " :" <<endl;
cin.getline(sbericht, 250);
antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL);
antwoord = send(sConnect, chatname, sizeof(chatname), NULL);
while(antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL) && (antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL)))
{
antwoord = recv(sConnect, sbericht, sizeof(sbericht), NULL);
antwoord = recv(sConnect, chatname, sizeof(chatname), NULL);
cout << chatname << ":" <<endl;
cout << sbericht <<endl;
cin.getline(sbericht, 250);
}
}
else
{
cout << "The connection to the server has been lost... \n" << "please exit the client." <<endl;
}
}
}
}
}
答案 0 :(得分：0)
您可能需要打开另一个套接字。客户端也必须充当服务器。
答案 1 :(得分：0)
首先：将一个20mb的zip文件放入网上，获取大约4个有趣的源文件，这不是一个好选择。您的目标文件和调试输出对我们不感兴趣，因为我们希望帮助您的源代码。尝试下次上传仅包含源文件的zip文件。
其次：如果其他人想要了解您的源代码并且不熟悉您的母语，他们必须猜测。尝试使用英语作为源代码语言，以及其他各种原因。
现在回答你的问题：
答案已在您的代码中。目前，服务器正在循环，直到最大连接数，接收输入并发回答案。实际上你已经实现了它。我想如果你想以两种方式发送启动的消息，你必须稍微改变你的软件架构。
答案 2 :(得分：0)
您的代码存在一些基本问题：
服务器一次只能处理一个客户端。如果您的服务器上只有一个用户（就像聊天服务器一样），您需要能够同时监听多个连接。 select或WSAEventSelect和WaitForMultipleObjects会对此有所帮助。
您假设一次会显示整个固定大小的消息。 TCP无法保证（因为“流”概念将数据视为可能无限的单个字节序列），半数发送的消息可能会在等待其余时间时冻结服务器。如果这一切都在你的局域网上，那就没什么大不了了，但是如果你将这项服务暴露在互联网上，你就会要求随机锁定。为了防止这种情况，请获取数据并将其放在缓冲区中，只有当您有完整的消息时才对其进行处理。
对话以锁定步骤完成。也就是说，客户端发送消息，并等待响应，然后（并且仅然后）期望控制台输入。通过这种设计，每个发送的消息总会收到一条消息。为了解决这个问题，我经常会有一个线程来处理每个方向的数据 - 一个获取控制台输入并将其发送到服务器，另一个监听服务器并打印收到的消息。 （注意，这意味着你可以在输入时收到消息。这就是重点。但它会使控制台输入有点烦人。）线程是一个半高级主题 - 一旦你开始创建新线程，你经常需要担心同步等问题。但在这种情况下，它通常比替代品更清洁。
示例线程代码（非常粗略，因为我没有方便的C ++编译器）：
const int MessageLength = 250;
const int NameLength = 250;
char myname[NameLength];
bool sendFully(SOCKET s, char* buffer, size_t buffer_len, int flags)
{
char *end = buffer + buffer_len;
while (buffer != buffer_len)
{
int sent = send(s, buffer, end - buffer, flags);
if (sent == 0) return false;
buffer += sent;
}
return true;
}
DWORD WINAPI watchConsoleInput(void*)
{
char input[MessageLength];
while (true)
{
std::cin.getline(input, MessageLength);
if (!sendFully(sConnect, input, sizeof(input), 0))
break;
if (!sendFully(sConnect, myname, sizeof(myname), 0))
break;
}
return 0;
}
int main()
{
char chatname[NameLength];
char sbericht[MessageLength];
... get our name in myname ...
... do the connect stuff ...
HANDLE watcher = CreateThread(NULL, 0, watchConsoleInput, NULL, 0, NULL);
while (true)
{
// Added MSG_WAITALL to work around the whole-message-at-a-time thing
if (recv(sConnect, sbericht, sizeof(sbericht), MSG_WAITALL) != sizeof(sbericht))
break;
if (recv(sConnect, chatname, sizeof(chatname), MSG_WAITALL) != sizeof(sbericht))
break;
}
// Don't care about errors; we're just being polite
shutdown(sConnect, SD_BOTH);
closesocket(sConnect);
cout << "Connection lost\n";
// ExitProcess rather than just 'return', so we know the watcher thread dies
ExitProcess(0);
}