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About LinkBacks
I'm using the code below to send messages between the through the two programs.
It works, but I'm getting a lot of excess characters and I have no idea where they came from...
http://i56.tinypic.com/5by613.png
Server:
Code:#pragma comment(lib, "ws2_32") #include <winsock2.h> #include <iostream> using namespace std; int StartServerListening(unsigned short port); void EndServer(int socket); HANDLE Hthread; // Used to handle our threads HANDLE Hmutex; // A mutex is bascially a memory spot we can lock so nothing writes to it as we read form it.. That could cause issues FD_SET masterSet; // This basically is our list of sockets that we will lock and unlock with out mutexHandle // A FD_SET has a few data members: // - fd_count - the number of file descriptors in the set // - fd_array - the array of file descriptors // We can use these little macros to help edit the FD_SET // - FD_SET(a socket, FD_SET to manipulate) - add a scoket to the set // - FD_ZERO(FD_SET to manipulate) - zero a set // - FD_CLR(a socket, FD_SET to manipulate) - remove a socket from the set // - FD_ISSET(a socket, FD_SET to manipulate) - checks if the socket is already in the set bool gQuitFlag = false;// A flag ill use to terminate the program if it goes terribly wrong // AcceptThread() - a This function will accept ALL incomming connections Then add to the FD_SET list void AcceptThread(int* serverSocket) { SetConsoleTitle(L"Server"); int mySocket = *serverSocket; // Copy my socket over to a local variable for (;;) { unsigned int clientSocket = accept(mySocket, 0, 0); // Do a normal accept if (clientSocket == SOCKET_ERROR) { gQuitFlag = true; // Quit this thread return; } else { WaitForSingleObject(Hmutex, INFINITE);// Lock the mutex and wait for it FD_SET(clientSocket, &masterSet);// Add this socket to the master set using FD_SET() ReleaseMutex(Hmutex);// Unlock the mutex cout << "client on " << clientSocket <<" connected.\n" << endl;// Let everyone know someone just joined } } } int main() { int serverSocket; serverSocket = StartServerListening(7700); if (serverSocket == -1) { return 1; } Hmutex = CreateMutex(NULL, false, NULL);// Create the mutex if (Hmutex == NULL) { EndServer(serverSocket); return 1; } int thread;// Create the thread Hthread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)AcceptThread, &serverSocket, 0, (LPDWORD)&thread); if (Hthread == NULL) { EndServer(serverSocket); return 1; } Sleep(100);// Let the AcceptThread start up, cheap method, but oh well -.-; FD_ZERO(&masterSet); // Always zero your sets before you use them, you know.. just incase... for (;;) { if (gQuitFlag) { break; } WaitForSingleObject(Hmutex, INFINITE); // Lock the mutex FD_SET TempSet = masterSet; // Make a temp location so we can unlock our mutex and let our accept thread run ASAP ReleaseMutex(Hmutex); // Unlock the mutex if (TempSet.fd_count == 0) // If a set is empty and we call form it, it returns a error, thats too much coding for me { // So we will simply check if there is anything in it, if so we will do something, else screw it -.-; continue; } // select() has 5 member datas of use to us they are // - the number of file descriptors // - a FD_SET checks readability // - a FD_SET checks for writeability // - a FD_SET checks for errors // - a wait time timeval waitTime; // Set up our interval waitTime.tv_sec = 0; // Set it to 0 waitTime.tv_usec = 0; // Set it to 0 int result = select(TempSet.fd_count, &TempSet, NULL, NULL, &waitTime); // Select a socket in out TempSet if (result == 0) // Check for 0's agian { continue; // = Empty } if (result == SOCKET_ERROR) { continue; } for (unsigned int i = 0; i < TempSet.fd_count; i++) { unsigned int clientSocket = TempSet.fd_array[i]; int nBytes; #define MAX_MESSAGE_SIZE 4096 char buffer[MAX_MESSAGE_SIZE]; unsigned long messageSize; nBytes = recv(clientSocket, (char*)&messageSize, sizeof(messageSize), 0); if (nBytes == SOCKET_ERROR) { int error = WSAGetLastError();// Main error you will get here is if the other client suddenly disconnects or loses power or something similar if (error == WSAECONNRESET) { WaitForSingleObject(Hmutex, INFINITE); // Lock our mutex FD_CLR(clientSocket, &masterSet); // Remove the socket from our master set ReleaseMutex(Hmutex); // Unlock our mutex closesocket(clientSocket); // Close the socket on our side so our computer cleans up properly cout << "Server: Client on "<< clientSocket << " has Disconnected." << endl; // Tell everyone the person left continue; } else { gQuitFlag = true; break; } } if (nBytes == 0) // Called if the user exits and calls closesocket() on THEIR side. They stops ending data, thus 0 bytes, ets jsut remove them from the set { WaitForSingleObject(Hmutex, INFINITE); // Lock our mutex FD_CLR(clientSocket, &masterSet); // Remove the socket from our master set ReleaseMutex(Hmutex); // Unlock our mutex closesocket(clientSocket); // Close the socket on our side, so our computer cleans up properly cout << "Server: Client on " << clientSocket << " has disconnected" << "\n";// Quick Message to the rest in the room continue;// On to the next one! } messageSize = ntohl(messageSize); nBytes = recv(clientSocket, buffer, messageSize, 0); if (nBytes == SOCKET_ERROR) { cout << "Server: I failed the message sir!\n"; gQuitFlag = true; break; } buffer[messageSize] = ' '; cout << "Server: Client [" << clientSocket << "]: " << buffer << "\n"; } } EndServer(serverSocket); cout << "Server: Press any key to shut me down....\n"; cin.get(); return 0; } int StartServerListening(unsigned short port) { int error; WSAData wsaData; if ((error = WSAStartup(MAKEWORD(2, 2), &wsaData)) == SOCKET_ERROR) { cout << "Server: Winsock is being a .......... Sir!\n"; return -1; } int mySocket = socket(AF_INET, SOCK_STREAM, 0); if (mySocket == SOCKET_ERROR) { cout << "Server: ****ing Socket is stuck closed!\n"; return -1; } struct sockaddr_in server; server.sin_family = AF_INET; server.sin_port = htons(port); server.sin_addr.s_addr = INADDR_ANY; if (bind(mySocket, (sockaddr*)&server, sizeof(server)) == SOCKET_ERROR) { cout << "Server: Sorry Sir! My Bind Failed!\n"; closesocket(mySocket); return -1; } if (listen(mySocket, 5) == SOCKET_ERROR) { cout << "Server: I failed to listen -.-;\n"; closesocket(mySocket); return -1; } cout << "Server: Starting Up.. READY!\n"; return mySocket; } void EndServer(int socket) { WaitForSingleObject(Hthread, INFINITE);// Kill thread and handle CloseHandle(Hthread); CloseHandle(Hmutex); closesocket(socket); WSACleanup(); cout << "Server: Shuting down master.\n"; }
Client:
Code:#pragma comment(lib, "ws2_32") int StartClient(unsigned short port, const char* serverName); void EndClient(int clientSocket); #include <winsock2.h> #include <iostream> using namespace std; int main() { SetConsoleTitle(L"Client"); int mySocket; mySocket = StartClient(7700, "localhost"); if (mySocket == -1) { EndClient(mySocket); return 1; } int nBytes; #define MAX_MESSAGE_SIZE 4096 char buffer[MAX_MESSAGE_SIZE]; cout << "Message to send (exit to exit) > "; for (;;) { gets(buffer); if (strcmp(buffer, "exit") == 0) { break; } unsigned long messageSize = strlen(buffer); messageSize = htonl(messageSize); if ((nBytes = send(mySocket, (char*)&messageSize, sizeof(messageSize), 0)) == SOCKET_ERROR) { cout << "Client: Error Sending.\n"; } messageSize = ntohl(messageSize); if ((nBytes = send(mySocket, buffer, messageSize, 0)) == SOCKET_ERROR) { cout << "Client: Error Sending.\n"; } cout << "\n>"; } EndClient(mySocket); return 0; } int StartClient(unsigned short port, const char* serverName) { int error; WSAData wsaData; if ((error = WSAStartup(MAKEWORD(2, 2), &wsaData)) == SOCKET_ERROR) { cout << "Client: Error Connecting.\n"; return -1; } int mySocket = socket(AF_INET, SOCK_STREAM, 0); if (mySocket == SOCKET_ERROR) { cout << "Client: Error Connecting.\n"; return -1; } struct hostent *host_entry; if ((host_entry = gethostbyname(serverName)) == NULL) { cout << "Client: Eror Resolving Host.\n"; } struct sockaddr_in server; server.sin_family = AF_INET; server.sin_port = htons(port); server.sin_addr.s_addr = *(unsigned long*) host_entry->h_addr; if (connect(mySocket, (sockaddr*)&server, sizeof(server)) == SOCKET_ERROR) { cout << "Client: Error Connecting.\n"; } cout << "Client: Connection Successful.\n"; return mySocket; } void EndClient(int clientSocket) { closesocket(clientSocket); WSACleanup(); }
Originally Posted by bernt 
