Client IOCP.zip

/* ========================================================================== Purpose: This is a sample code that demonstrates for the following: * Use of the I/O Completion ports with WinSock. The idea is to create a simple application that will use IOCP, highlight how to use IOCP. Notes: * The client will make simple socket calls. Let server use IOCP to manage them. Author: * Swarajya Pendharkar Date: * 10th March 2006 Updates: * Minor tweaks - 24th March 2006 * Removed a comment - 9th June 2006 * Updates for stress testing, client will keep running till we want it to - 19th August 2006 * Client is now multi-threaded - 22th August 2006 * New improved WriteToConsole() - 24th September 2006 * Visual C++ 2005 migration updates - 3rd Feb 2007 ========================================================================== */ #include "stdafx.h" #include <stdio.h> #include <stdlib.h> #include <conio.h> #include <string.h> #include <winsock2.h> #include "ClientIOCP.h" int main(int argc, char* argv[]) { //Validate the input if (argc < 3) { printf("\nUsage: %s hostname port.", argv[0]); return 1; //error } //Initialize Winsock WSADATA wsaData; int nResult = WSAStartup(MAKEWORD(2,2), &wsaData); if (NO_ERROR != nResult) { printf("\nError occurred while executing WSAStartup()."); return 1; //error } //Initialize the Console Critical Section InitializeCriticalSection(&g_csConsole); int nPortNo = atoi(argv[2]); char szBuffer[MAX_BUFFER_LEN]; int nNoOfThreads = 0; int nNoOfSends = 0; printf("\nPlease enter message to be sent to the server: "); //Read the message from server gets(szBuffer); printf("\nPlease enter number of threads to be created: "); //No. of times we will send the message to the server scanf("%d", &nNoOfThreads); printf("\nPlease enter number of times the messages needs to be sent: "); //No. of times we will send the message to the server scanf("%d", &nNoOfSends); HANDLE *p_hThreads = new HANDLE[nNoOfThreads]; ThreadInfo *pThreadInfo = new ThreadInfo[nNoOfThreads]; bool bConnectedSocketCreated = false; DWORD nThreadID; for (int ii = 0; ii < nNoOfThreads; ii++) { bConnectedSocketCreated = CreateConnectedSocket(&(pThreadInfo[ii].m_Socket), argv[1], nPortNo); if (!bConnectedSocketCreated) { //Clean up memory delete[] p_hThreads; delete[] pThreadInfo; //failed in creating of connected socket, error out. return 1; } //Populate ThreadInfo pThreadInfo[ii].m_nNoOfSends = nNoOfSends; pThreadInfo[ii].m_nThreadNo = ii+1; sprintf(pThreadInfo[ii].m_szBuffer, "Thread %d - %s", ii+1, szBuffer); //Create thread and start banging the server p_hThreads[ii] = CreateThread(0, 0, WorkerThread, (void *)(&pThreadInfo[ii]), 0, &nThreadID); } //Let Worker Threads shutdown WaitForMultipleObjects(nNoOfThreads, p_hThreads, TRUE, INFINITE); //Close the sockets here for (int ii = 0; ii < nNoOfThreads; ii++) { closesocket(pThreadInfo[ii].m_Socket); } //Clean up memory delete[] p_hThreads; delete[] pThreadInfo; //Delete the Console Critical Section. DeleteCriticalSection(&g_csConsole); //Cleanup Winsock WSACleanup(); return 0; } //vprintf() is not thread safe void WriteToConsole(char *szFormat, ...) { EnterCriticalSection(&g_csConsole); va_list args; va_start(args, szFormat); vprintf(szFormat, args ); va_end(args); LeaveCriticalSection(&g_csConsole); } bool CreateConnectedSocket(SOCKET *pSocket, char *szHost, int nPortNo) { struct sockaddr_in ServerAddress; struct hostent *Server; //Create a socket *pSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == *pSocket) { WriteToConsole("\nError occurred while opening socket: %d.", WSAGetLastError()); return false; //error } //Server name will be supplied as a commandline argument //Get the server details Server = gethostbyname(szHost); if (Server == NULL) { closesocket(*pSocket); WriteToConsole("\nError occurred no such host."); return false; //error } //Cleanup and Init with 0 the ServerAddress ZeroMemory((char *) &ServerAddress, sizeof(ServerAddress)); ServerAddress.sin_family = AF_INET; //Assign the information received from gethostbyname() CopyMemory((char *)&ServerAddress.sin_addr.s_addr, (char *)Server->h_addr, Server->h_length); ServerAddress.sin_port = htons(nPortNo); //Establish connection with the server if (SOCKET_ERROR == connect(*pSocket, reinterpret_cast<const struct sockaddr *>(&ServerAddress),sizeof(ServerAddress))) { closesocket(*pSocket); WriteToConsole("\nError occurred while connecting."); return false; //error } return true; } DWORD WINAPI WorkerThread(LPVOID lpParam) { ThreadInfo *pThreadInfo = (ThreadInfo*)lpParam; char szTemp[MAX_BUFFER_LEN]; int nBytesSent = 0; int nBytesRecv = 0; for (int ii = 0; ii < pThreadInfo->m_nNoOfSends; ii++) { sprintf(szTemp, "%d. %s", ii+1, pThreadInfo->m_szBuffer); //Send the message to the server, include the NULL as well nBytesSent = send(pThreadInfo->m_Socket, szTemp, strlen(szTemp), 0); if (SOCKET_ERROR == nBytesSent) { WriteToConsole("\nError occurred while writing to socket %ld.", WSAGetLastError()); return 1; //error } //Get the message from the server nBytesRecv = recv(pThreadInfo->m_Socket, szTemp, 255, 0); if (SOCKET_ERROR == nBytesRecv) { WriteToConsole("\nError occurred while reading from socket %ld.", WSAGetLastError()); return 1; //error } //Display the server message WriteToConsole("\nServer sent the following message: %s", szTemp); } return 0; //success }