C 客户端服务器回显聊天(多路复用I/O+线程)
我刚开始学习C语言,我正在尝试处理Windows套接字 问题是服务器只能接受和发送一次消息。 我使用了调试模式,看到工作在服务器部分的select中停止。这在客户端看起来很好,但我不确定,也没有看到代码中的问题。但我有这样一个结果。怎么了 我注意到我的tv.tv_秒没有定义,我在选择之前就这样做了,没有任何更改 当然,因为我需要接收和发送消息,所以我不需要在accept中写入描述符,对吗 客户端使用CreateThread函数,我尝试在其中发送消息。Send在main的while1循环中 服务器部件:C 客户端服务器回显聊天(多路复用I/O+线程),c,multithreading,sockets,server,multiplexing,C,Multithreading,Sockets,Server,Multiplexing,我刚开始学习C语言,我正在尝试处理Windows套接字 问题是服务器只能接受和发送一次消息。 我使用了调试模式,看到工作在服务器部分的select中停止。这在客户端看起来很好,但我不确定,也没有看到代码中的问题。但我有这样一个结果。怎么了 我注意到我的tv.tv_秒没有定义,我在选择之前就这样做了,没有任何更改 当然,因为我需要接收和发送消息,所以我不需要在accept中写入描述符,对吗 客户端使用CreateThread函数,我尝试在其中发送消息。Send在main的while1循环中 服务器
int main(int argc, char* argv[])
{
/* definitions, WSAStartup(), socket(), bind(), listen()
Listening socket is a returned value of listen() function*/
FD_ZERO(&readSet);
FD_ZERO(&writeSet);
while (1)
{
// SELECT (LISTENING SOCKET)
FD_ZERO(&readSet);
FD_SET(listeningSocket, &readSet);
tv.tv_sec = 5;
printf("Listening: Read FD: %d; Write FD : %d;\n", FD_ISSET(listeningSocket, &readSet), FD_ISSET(listeningSocket, &writeSet));
if ((retVal = select(listeningSocket + 1, &readSet, NULL, NULL, 0)) == SOCKET_ERROR)
{
printf("Select error ");
break;
}
else if (retVal == 0)
{
printf(". . .\n");
continue;
}
else
{
// READ SD
if ((FD_ISSET(listeningSocket, &readSet)) != SOCKET_ERROR)
{
if ((newSocketDescriptor = accept(listeningSocket, (struct sockaddr *)&clientAddr, &clientAddrSize)) == SOCKET_ERROR)
{
printf("Accept error ");
break;
}
FD_ZERO(&readSet);
FD_SET(newSocketDescriptor, &readSet);
HOSTENT *hst = gethostbyaddr((const char *)&serverAddr.sin_addr.s_addr, 4, AF_INET);
printf("Welcome %s (%s:%d) new connected\n", hst->h_name, inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));
printf("Read FD: %d; Write FD : %d;\n", FD_ISSET(newSocketDescriptor, &readSet), FD_ISSET(newSocketDescriptor, &writeSet));
// READ
if (FD_ISSET(newSocketDescriptor, &readSet) != 0)
{
if ((numBytes = recv(newSocketDescriptor, &bufferData[0], sizeof(bufferData), 0)) == SOCKET_ERROR)
{
printf("Recv failed \n");
freeSocketInformation(newSocketDescriptor);
break;
}
bufferData[numBytes] = '\0';
printf("Client -> Server: %s\n", &bufferData[0]);
}
// WRITE
FD_ZERO(&writeSet);
FD_SET(newSocketDescriptor, &writeSet);
printf("Read FD: %d; Write FD : %d;\n", FD_ISSET(newSocketDescriptor, &readSet), FD_ISSET(newSocketDescriptor, &writeSet));
if (FD_ISSET(newSocketDescriptor, &writeSet) != 0)
{
//fgets(&bufferData[0], sizeof(bufferData), stdin);
if (send(newSocketDescriptor, &bufferData[0], strlen(&bufferData[0]), 0) == SOCKET_ERROR)
{
printf("Send error ");
freeSocketInformation(newSocketDescriptor);
break;
}
bufferData[numBytes] = '\0';
printf("Server -> Client: %s\n", &bufferData[0]);
}
printf("Read FD: %d; Write FD : %d;\n", FD_ISSET(newSocketDescriptor, &readSet), FD_ISSET(newSocketDescriptor, &writeSet));
FD_SET(newSocketDescriptor, &readSet);
}
}
}
//FD_CLR(listeningSocket, &readSet);
closesocket(newSocketDescriptor);
} while (FALSE);
printf("- Error code: %d\n", WSAGetLastError());
closesocket(listeningSocket);
WSACleanup();
return 0;
}
客户端部分它使用代码末尾的CreateThread函数:
/* definitions, socket(), connect()*/
if (ioctlsocket(socketDescriptor, FIONBIO, (unsigned long *)&nb) != 0)
{
printf("ioctlsocket error ");
break;
}
FD_ZERO(&writeSet);
FD_SET(socketDescriptor, &writeSet);
if ((retVal = select(socketDescriptor + 1, NULL, &writeSet, NULL, &tv)) == SOCKET_ERROR)
{
printf("Send non-blocking error ");
break;
}
else if (retVal == 0)
{
printf("Non-blocking connect time limit is expired");
break;
}
}
printf("Connection with %s\n", SERVERADDR);
DWORD thID;
printf("Socket Desciptor: %d\n", socketDescriptor);
HANDLE hThread = CreateThread(NULL, NULL, HandleReadThread, (LPVOID)socketDescriptor, NULL, &thID);
printf("Thread ID: %d\n", thID);
while (1)
{
// WRITE
printf("Client -> Server: ");
fgets(&bufferData[0], sizeof(bufferData), stdin);
FD_ZERO(&writeSet);
FD_SET(socketDescriptor, &writeSet);
tv.tv_sec = 5;
if ((retVal = select(socketDescriptor + 1, NULL, &writeSet, NULL, &tv)) == SOCKET_ERROR)
{
printf("Send non-blocking error ");
break;
}
if (FD_ISSET(socketDescriptor, &writeSet) != 0)
{
if (send(socketDescriptor, bufferData, strlen(&bufferData[0]), 0) == SOCKET_ERROR)
{
printf("Send error ");
break;
}
}
}
} while (FALSE);
printf("- Error code: %d\n", WSAGetLastError());
closesocket(socketDescriptor);
WSACleanup();
return 0;
}
DWORD WINAPI HandleReadThread(LPVOID serverSocket)
{
SOCKET socketDescriptor;
socketDescriptor = (SOCKET)serverSocket;
char bufferData[MAXDATASIZE] = { 0 };
int retVal;
fd_set readSet;
timeval tv = { 0 };
tv.tv_sec = 5;
int numBytes;
int nclients = 0;
while (1)
{
FD_ZERO(&readSet);
FD_SET(socketDescriptor, &readSet);
if ((retVal = select(socketDescriptor + 1, &readSet, NULL, NULL, &tv)) == SOCKET_ERROR)
{
printf("Select error. Error code: %d", WSAGetLastError());
break;
}
else if (retVal == 0)
{
//printf(". . .\n");
continue;
}
else
{
//FD_ZERO(socketDescriptor, &readSet);
//FD_SET(socketDescriptor, &readSet);
// READ
if (FD_ISSET(socketDescriptor, &readSet) != 0)
{
if ((numBytes = recv(socketDescriptor, &bufferData[0], sizeof(bufferData), 0)) == SOCKET_ERROR)
{
printf("Recv error in Thread. Error code: %d\n", WSAGetLastError());
break;
}
printf("\nSocket Desciptor: %d\n", socketDescriptor);
bufferData[numBytes] = '\0';
printf("Server -> Client: %s\n", &bufferData[0]);
}
}
}
closesocket(socketDescriptor);
return 0;
}
我自己解决的。状况
if ((FD_ISSET(listeningSocket, &readSet)) != 0)
工作了一个周期,应该在接受功能后完成。
此外,我还在while1开头的readSet的FD_SET之后添加了以下几行:
if (newSocketDescriptor)
{
FD_SET(newSocketDescriptor, &readSet);
}
聊天开始工作,但是有很多东西需要处理:do{…}while FALSE;对于FALSE的偏心非零值,仅用作无限循环。使用TRUE而不是FALSE,或1,或…是的,它只是用于从错误消息中取出并查看错误代码,因为每次在每个错误消息中都不写入WSAGetLastError,它不涉及逻辑。哦,我明白了。对打扰这意味着有很多代码需要处理,而我的机器没有WSA*函数。你确定这是一个MCVE吗?有一个完整的代码,我希望我尽量减少它,以了解发生了什么:谢谢!