WSAAyncSelect 学习的经典例子（tcp实现）

/*WSAAyncSelect server 代码*/#include "stdafx.h"#define WM_SOCKET WM_USER+101 #include <WINSOCK2.H> #include "stdafx.h"#include <winsock.h>#include <iostream>using namespace std;#pragma comment(lib,"WS2_32") //----------------窗口过程函数的声明------------- LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);//----------------WinMain()函数------------------ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){WNDCLASS wc;wc.style = CS_HREDRAW | CS_VREDRAW;wc.lpfnWndProc = WindowProc;wc.cbClsExtra = 0;wc.cbWndExtra = 0;wc.hInstance = hInstance;wc.hIcon = LoadIcon(NULL, IDI_EXCLAMATION);wc.hCursor = LoadCursor(NULL, IDC_ARROW);wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);wc.lpszMenuName = NULL;wc.lpszClassName = TEXT("Test");//---注册窗口类---- RegisterClass(&wc);//---创建窗口---- HWND hwnd = CreateWindow(TEXT("Test"), TEXT("窗口标题"), WS_SYSMENU, 300, 0, 600, 400, NULL, NULL, hInstance, NULL);if (hwnd == NULL){MessageBox(hwnd, TEXT("创建窗口出错"), TEXT("标题栏提升"), MB_OK);return 1;}//---显示窗口---- ShowWindow(hwnd, SW_SHOWNORMAL);UpdateWindow(hwnd);//---socket----- WSADATA wsaData;WORD wVersionRequested = MAKEWORD(2, 2);if (WSAStartup(wVersionRequested, &wsaData) != 0){MessageBox(NULL, TEXT("WSAStartup() Failed"), TEXT("调用失败"), 0);return 1;}SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (s == INVALID_SOCKET){MessageBox(NULL, TEXT("socket() Failed"), TEXT("调用失败"), 0);return 1;}sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(1111);sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");if (bind(s, (sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR){MessageBox(NULL, TEXT("bind() Failed"), TEXT("调用失败"), 0);return 1;}if (listen(s, 3) == SOCKET_ERROR){MessageBox(NULL, TEXT("listen() Failed"), TEXT("调用失败"), 0);return 1;}elseMessageBox(NULL, TEXT("waiting meg4"), TEXT("调用失败"), 0);//cout << "waiting meg4" << endl;MessageBox(hwnd, TEXT("进入监听状态！"), TEXT("标题栏提示"), MB_OK);  /*    int WSAAsyncSelect(    SOCKET s,  //标识一个需要事件通知的套接口描述符    HWND hWnd,  //标识一个在网络事件发生时要想收到消息的窗口或对话框的句柄    u_int wMsg,  //在网络事件发生时要接收的消息，该消息会投递到由hWnd句柄指定的窗口或对话框    long lEvent  //位屏蔽码，用于指明应用程序感兴趣的网络事件集合    );    */    //---消息循环----     MSG msg;     while (GetMessage(&msg,0,0,0))     {         TranslateMessage(&msg); //将键盘上的虚拟消息进行映射成系统消息，放到消息队列中        DispatchMessage(&msg);         /*        它的意思就是说要把这条消息发送到窗口里的消息处理函数WindowProc        */    } closesocket(s);WSACleanup();return msg.wParam;}//-------------------窗口过程---------------------- LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){switch (uMsg){cout << "waiting meg5" << endl;case WM_SOCKET:{  SOCKET ss = wParam;   //wParam参数标志了网络事件发生的套接口   if (WSAGETSELECTERROR(lParam))  {  closesocket(ss);  return 0;  }  switch (WSAGETSELECTEVENT(lParam))  {  case FD_ACCEPT:   //-----①连接请求到来   {sockaddr_in Cadd;int Cadd_len = sizeof(Cadd);SOCKET sNew = accept(ss, (sockaddr*)&Cadd, &Cadd_len);if (ss == INVALID_SOCKET)MessageBox(hwnd, TEXT("调用accept()失败！"), TEXT("标题栏提示"), MB_OK);WSAAsyncSelect(sNew, hwnd, WM_SOCKET, FD_READ | FD_CLOSE);  }break;  case FD_READ:   //-----②数据发送来   {  char cbuf[256];  memset(cbuf, 0, 256);  int cRecv = recv(ss, cbuf, 256, 0);  if ((cRecv == SOCKET_ERROR&& WSAGetLastError() == WSAECONNRESET) || cRecv == 0)  {  MessageBox(hwnd, TEXT("调用recv()失败！"), TEXT("标题栏提示"), MB_OK);  closesocket(ss);  }  else if (cRecv>0)  {  MessageBox(hwnd, (LPCWSTR)cbuf, TEXT("收到的信息"), MB_OK);  char Sbuf[] = "Hello client!I am server";  int isend = send(ss, Sbuf, sizeof(Sbuf), 0);  if (isend == SOCKET_ERROR || isend <= 0)  {  MessageBox(hwnd, TEXT("发送消息失败！"), TEXT("标题栏提示"), MB_OK);  }  else  MessageBox(hwnd, TEXT("已经发信息到客户端！"), TEXT("标题栏提示"), MB_OK);  }  }break;  case FD_CLOSE:    //----③关闭连接   {closesocket(ss);  }  break;  }}break;case WM_CLOSE:if (IDYES == MessageBox(hwnd, TEXT("是否确定退出？"), TEXT("message"), MB_YESNO))DestroyWindow(hwnd);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd, uMsg, wParam, lParam);}return 0;}

/*WSAAyncSelect client 代码*/#include "stdafx.h"#include <iostream>using namespace std;//#include <WINSOCK2.H>#include < WinSock2.h> #pragma comment( lib, "ws2_32" ) #include < stdio.h> int main(){system("chcp 936>NUL");printf("1号客户端程序\n");//-----------①加载----------------WSADATA wsaData;WORD wVersionRequested = MAKEWORD(2, 2);if (WSAStartup(wVersionRequested, &wsaData) != 0){printf("WSAStartup Failed,Error=【%d】\n", WSAGetLastError());return 1;}elseprintf("①加载成功\n");//-------------②创建流式套接字-----------------SOCKET c1 = socket(AF_INET, SOCK_STREAM, 0);if (c1 == INVALID_SOCKET){printf("socket() Failed,Error=【%d】\n", WSAGetLastError());return 1;}elseprintf("②已创建连接套接字:【%d】\n", c1);//------------③连接请求---------------struct sockaddr_in Sadd;Sadd.sin_family = AF_INET;Sadd.sin_port = htons(1111);Sadd.sin_addr.s_addr = inet_addr("127.0.0.1");     if (connect(c1, (sockaddr*)& Sadd, sizeof (Sadd)) == -1){printf("Failed connect(),Error=【%d】\n", WSAGetLastError());return 1;}else //*********连接成功，可以开始发送、接收************{printf("③连接成功，服务器IP地址:【%s】,端口号：【%d】\n", inet_ntoa(Sadd.sin_addr), ntohs(Sadd.sin_port));int a;printf("希望发送数据吗？(键入“1”发送，键入其他值则退出)");scanf("%d", &a);while (a == 1){//---发送-----char S_buf[] = "Hello!I am a client 1";int isend = send(c1, S_buf, strlen(S_buf), 0);if (isend == SOCKET_ERROR){printf("Failed send(),Error=【%d】,或者服务器意外关闭\n", WSAGetLastError());return 1;}else if (isend != 0)printf("信息【%s】已发送\n", S_buf);elseprintf("信息无法发送给客户端\n");//---接收----char R_buf[256];int RRecv;memset(R_buf, 0, sizeof (R_buf));RRecv = recv(c1, R_buf, 256, 0);if (RRecv == SOCKET_ERROR){printf("Failed recv(),Error=【%d】\n", WSAGetLastError());return 1;}else if (RRecv == 0)printf("无法收到来自服务器的任何数据，或者服务器意外关闭\n");else{printf("接收到来自服务器的数据：【%s】\n", R_buf);printf("希望继续发送数据吗？（键入”1“继续发送，键入其他值则退出)");scanf("%d", &a);if (a != 1)break;}} //-------end 结束printf("已选择退出连接\n");} //------end 结束//-------------------④关闭、释放------------closesocket(c1);WSACleanup();printf("④与服务器连接完毕\n");return 0;}