（转）用完成端口写的echo server

#include <winsock2.h>#include <mswsock.h>#include <windows.h>#include <iostream>using namespace std;int g_ThreadCount;HANDLE g_hIOCP = INVALID_HANDLE_VALUE;SOCKET g_ServerSocket = INVALID_SOCKET;// Maximum Buffer Size#define MAX_BUFF_SIZE 8192enum IO_OPERATION{IO_READ,IO_WRITE};struct IO_DATA{ WSAOVERLAPPED Overlapped; char Buffer[MAX_BUFF_SIZE]; WSABUF wsabuf; int nTotalBytes; int nSentBytes; IO_OPERATION opCode; SOCKET activeSocket;};DWORD WINAPI WorkerThread (LPVOID WorkThreadContext) { LPWSAOVERLAPPED lpOverlapped = NULL; IO_DATA *lpIOContext = NULL; WSABUF buffSend; DWORD dwRecvNumBytes = 0; DWORD dwSendNumBytes = 0; DWORD dwFlags = 0; DWORD dwIoSize = 0; BOOL bSuccess = FALSE; int nRet = 0; while( 1 ) { void * lpCompletionKey = NULL; bSuccess = GetQueuedCompletionStatus(g_hIOCP, &dwIoSize, (LPDWORD)&lpCompletionKey, (LPOVERLAPPED *)&lpOverlapped, INFINITE); if( !bSuccess ) { cout << "GetQueuedCompletionStatus() failed:"<<GetLastError()<<endl; break; } lpIOContext = (IO_DATA *)lpOverlapped; if(dwIoSize == 0) //socket closed? { cout << "Client disconnect" << endl; closesocket(lpIOContext->activeSocket); delete lpIOContext; continue; } if(lpIOContext->opCode == IO_READ) // a read operation complete { lpIOContext->nTotalBytes = lpIOContext->wsabuf.len; lpIOContext->nSentBytes = 0; lpIOContext->opCode = IO_WRITE; dwFlags = 0; nRet = WSASend( lpIOContext->activeSocket, &lpIOContext->wsabuf, 1, &dwSendNumBytes, dwFlags, &(lpIOContext->Overlapped), NULL); if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError()) ) { cout << "WASSend Failed::Reason Code::"<< WSAGetLastError() << endl; closesocket(lpIOContext->activeSocket); delete lpIOContext; continue; } } else if(lpIOContext->opCode == IO_WRITE) //a write operation complete { lpIOContext->nSentBytes += dwIoSize; dwFlags = 0; if( lpIOContext->nSentBytes < lpIOContext->nTotalBytes ) { lpIOContext->opCode = IO_WRITE; // A Write operation has not completed yet, so post another // Write operation to post remaining data. buffSend.buf = lpIOContext->Buffer + lpIOContext->nSentBytes; buffSend.len = lpIOContext->nTotalBytes - lpIOContext->nSentBytes; nRet = WSASend ( lpIOContext->activeSocket, &buffSend, 1, &dwSendNumBytes, dwFlags, &(lpIOContext->Overlapped), NULL); if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError()) ) { cout << "WASSend Failed::Reason Code::"<< WSAGetLastError() << endl; closesocket(lpIOContext->activeSocket); delete lpIOContext; continue; } } else { // Write operation completed, so post Read operation. lpIOContext->opCode = IO_READ; dwRecvNumBytes = 0; dwFlags = 0; lpIOContext->wsabuf.buf = lpIOContext->Buffer, ZeroMemory(lpIOContext->wsabuf.buf,MAX_BUFF_SIZE); lpIOContext->Overlapped.Internal = 0; lpIOContext->Overlapped.InternalHigh = 0; lpIOContext->Overlapped.Offset = 0; lpIOContext->Overlapped.OffsetHigh = 0; lpIOContext->Overlapped.hEvent = NULL; lpIOContext->wsabuf.len = MAX_BUFF_SIZE; nRet = WSARecv( lpIOContext->activeSocket, &lpIOContext->wsabuf, 1, &dwRecvNumBytes, &dwFlags, &lpIOContext->Overlapped, NULL); if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError()) ) { cout << "WASRecv Failed::Reason Code::"<< WSAGetLastError() << endl; closesocket(lpIOContext->activeSocket); delete lpIOContext; continue; } } } } return 0;}void main (int argc, char * argv[]){ { // Init winsock2 WSADATA wsaData; ZeroMemory(&wsaData,sizeof(WSADATA)); int retVal = -1; if( (retVal = WSAStartup(MAKEWORD(2,2), &wsaData)) != 0 ) { cout << "WSAStartup Failed::Reason Code::"<< retVal << endl; return; } } { //Create socket g_ServerSocket = WSASocket(AF_INET,SOCK_STREAM, IPPROTO_TCP, NULL,0,WSA_FLAG_OVERLAPPED); if( g_ServerSocket == INVALID_SOCKET ) { cout << "Server Socket Creation Failed::Reason Code::" << WSAGetLastError() << endl; return; } } { //bind sockaddr_in service; service.sin_family = AF_INET; service.sin_addr.s_addr = htonl(INADDR_ANY); service.sin_port = htons(5000); int retVal = bind(g_ServerSocket,(SOCKADDR *)&service,sizeof(service)); if( retVal == SOCKET_ERROR ) { cout << "Server Soket Bind Failed::Reason Code::"<< WSAGetLastError() << endl; return; } } { //listen int retVal = listen(g_ServerSocket, 8); if( retVal == SOCKET_ERROR ) { cout << "Server Socket Listen Failed::Reason Code::"<< WSAGetLastError() << endl; return; } } { // Create IOCP SYSTEM_INFO sysInfo; ZeroMemory(&sysInfo,sizeof(SYSTEM_INFO)); GetSystemInfo(&sysInfo); g_ThreadCount = sysInfo.dwNumberOfProcessors * 1; g_hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,0,g_ThreadCount); if (g_hIOCP == NULL) { cout << "CreateIoCompletionPort() Failed::Reason::"<< GetLastError() << endl; return; } if (CreateIoCompletionPort((HANDLE)g_ServerSocket,g_hIOCP,0,0) == NULL){ cout << "Binding Server Socket to IO Completion Port Failed::Reason Code::"<< GetLastError() << endl; return ; } } { //Create worker threads for( DWORD dwThread=0; dwThread < g_ThreadCount; dwThread++ ) { HANDLE hThread; DWORD dwThreadId; hThread = CreateThread(NULL, 0, WorkerThread, 0, 0, &dwThreadId); CloseHandle(hThread); } } { //accept new connection while(1) { SOCKET ls = accept( g_ServerSocket, NULL, NULL ); if(ls == SOCKET_ERROR) break; cout << "Client connected." << endl; { //diable buffer to improve performance int nZero = 0; setsockopt(ls, SOL_SOCKET, SO_SNDBUF, (char *)&nZero, sizeof(nZero)); } if (CreateIoCompletionPort((HANDLE)ls,g_hIOCP,0,0) == NULL){ cout << "Binding Client Socket to IO Completion Port Failed::Reason Code::"<< GetLastError() << endl; closesocket(ls); } else { //post a recv request IO_DATA * data = new IO_DATA; ZeroMemory(&data->Overlapped,sizeof(data->Overlapped)); ZeroMemory(data->Buffer,sizeof(data->Buffer)); data->opCode = IO_READ; data->nTotalBytes = 0; data->nSentBytes = 0; data->wsabuf.buf = data->Buffer; data->wsabuf.len = sizeof(data->Buffer); data->activeSocket = ls; DWORD dwRecvNumBytes=0,dwFlags=0; int nRet = WSARecv(ls,&data->wsabuf, 1, &dwRecvNumBytes, &dwFlags, &data->Overlapped, NULL); if(nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError())){ cout << "WASRecv Failed::Reason Code::"<< WSAGetLastError() << endl; closesocket(ls); delete data; } } } } closesocket(g_ServerSocket); WSACleanup();}

 

转自：http://www.cppblog.com/sandy/archive/2007/06/06/25670.html