[摘要]bytesRecv == WSAECONNRESET ) { printf( "Connection Closed.\n"); ... bytesRecv == WSAECONNRESET ) { printf( "Connection Closed.\n"); break; } if (bytesRecv < 0) return; printf( "Bytes Recv: %ld\n", bytesRecv ); } return; } 下面是服务器端代码: #include <stdio.h> #include <winsock2.h> #pragma comment(lib, "ws2_32.lib") void main() { // 初始化 WSADATA wsaData; int iResult = WSAStartup( MAKEWORD(2,2), &wsaData ); if ( iResult != NO_ERROR ) printf("Error at WSAStartup()\n"); // 建立socket SOCKET server; server = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ); if ( server == INVALID_SOCKET ) { printf( "Error at socket(): %ld\n", WSAGetLastError() ); WSACleanup(); return; } // 绑定socket sockaddr_in service; service.sin_family = AF_INET; service.sin_addr.s_addr = inet_addr( "127.0.0.1" ); service.sin_port = htons( 27015 ); if ( bind( server, (SOCKADDR*) &service, sizeof(service) ) == SOCKET_ERROR ) { printf( "bind() failed.\n" ); closesocket(server); return; } // 监听 socket if ( listen( server, 1 ) == SOCKET_ERROR ) printf( "Error listening on socket.\n"); // 接受连接 SOCKET AcceptSocket; printf( "Waiting for a client to connect...\n" ); while (1) { AcceptSocket = SOCKET_ERROR; while ( AcceptSocket == SOCKET_ERROR ) { AcceptSocket = accept( server, NULL, NULL ); } printf( "Client Connected.\n"); server = AcceptSocket; break; } // 发送接受数据 int bytesSent; int bytesRecv = SOCKET_ERROR; char sendbuf[32] = "Server: Sending Data."; char recvbuf[32] = ""; bytesRecv = recv( server, recvbuf, 32, 0 ); printf( "Bytes Recv: %ld\n", bytesRecv ); bytesSent = send( server, sendbuf, strlen(sendbuf), 0 ); printf( "Bytes Sent: %ld\n", bytesSent ); return; } 本程序仅仅描述了同步的情况! 第五节 多线程编程介绍 对于多线程的基本概念,我不在赘述,是个只要学习过一门编程语言就应该多进程和线程有个基本的了解.这里重点介绍一下如何实现多线程. 通常一个程序的主线程有操作系统创建,如果想让其创建额外的线程,可以调用CreateThread()函数来完成.函数原形如下: HANDLE CreateThread() { LPSECURITY_ATTRIBUTES LPThreadAttributes, //指向SECURITY_ATTRIBUTES的指针 SIZE_T dwStackSize, //表示线程为自己所用堆栈分配的地址空间的大小 系统缺省值为0 LPTHREAD_START-TOUTINE lpStartAddress, //表示新线程开始执行时代码所在函数的地址 即线程函数名 LPVOID lpParameter, //是传入线程函数的参数 DWORD dwCreationFlags, //指定控制线程创建的附加标志 取0线程立即执行 取CREATE_SUSPENDED线程挂起 LPDWORD lpThreadld //是个DWORD类型的地址,返回赋给该新线程的ID } 线程函数lpParameter必须有以下原形: DWORD WINAPI XXXThreadFun(LPVOID lpParameter) { return(0); } ________________________________________________________________________________________ 下面我们来创建一个线程: #include <windows.h> #include <stdio.h> DWORD WINAPI ThreadFunc( LPVOID lpParam ) //线程函数， 跟普通的函数没什么两样 { printf( "Parameter = %d.", *(DWORD*)lpParam ); return 0; } VOID main( VOID ) { DWORD dwThreadId, dwThrdParam = 1; HANDLE hThread; hThread = CreateThread( NULL,0,ThreadFunc,&dwThrdParam, 0,&dwThreadId); if (hThread == NULL) { printf( "CreateThread failed (%d)\n", GetLastError() ); } else { _getch(); CloseHandle( hThread ); } } 关于线程同步的问题,这里就不再讲解,请大家自己查阅资料,不查阅以后可能会有困难啊.培养一下各位的自己动手能力.
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