winsock -WSAAsyncSelect函数的网络事件类型表

来源：互联网发布：linux graphics.h 编辑：程序博客网时间：2024/05/16 17:42

1. WSAAsyncSelect 基于win事件机制处理的异步消息。
在使用异步网络中WSAAsyncSelect，需要处理的步骤：
{
1.在WM_CREATE消息处理函数中，初始化Windows Socket library，创建监听套接字，绑定，监听，
并且调用WSAAsyncSelect函数表示我们关心在监听套接字上发生的FD_ACCEPT事件；
2.自定义一个消息WM_SOCKET，一旦在我们所关心的套接字（监听套接字和客户端套接字）上发生了某个事件，
系统就会调用WndProc并且message参数被设置为WM_SOCKET；
3.在WM_SOCKET的消息处理函数中，分别对FD_ACCEPT、FD_READ和FD_CLOSE事件进行处理；
4.在窗口销毁消息(WM_DESTROY)的处理函数中，我们关闭监听套接字，清除Windows Socket library
}
下面这张用于WSAAsyncSelect函数的网络事件类型表可以让你对各个网络事件有更清楚的认识：
{
FD_READ 应用程序想要接收有关是否可读的通知，以便读入数据
FD_WRITE 应用程序想要接收有关是否可写的通知，以便写入数据
FD_OOB 应用程序想接收是否有带外（OOB）数据抵达的通知
FD_ACCEPT 应用程序想接收与进入连接有关的通知
FD_CONNECT 应用程序想接收与一次连接或者多点join操作完成的通知
FD_CLOSE 应用程序想接收与套接字关闭有关的通知
FD_QOS 应用程序想接收套接字“服务质量”（QoS）发生更改的通知
FD_GROUP_QOS 应用程序想接收套接字组“服务质量”发生更改的通知（现在没什么用处，为未来套接字组的使用保留）
FD_ROUTING_INTERFACE_CHANGE 应用程序想接收在指定的方向上，与路由接口发生变化的通知
FD_ADDRESS_LIST_CHANGE 应用程序想接收针对套接字的协议家族，本地地址列表发生变化的通知
}

SourceCode:
[cpp] view plain copy

#include <winsock.h>
#include <tchar.h>
#pragma comment(lib, "ws2_32.lib")


#define PORT 5150
#define MSGSIZE 1024
#define WM_SOCKET WM_USER+0 //自定义消息
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//MFC中要重载


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = _T("AsyncSelect Model");//标题
HWND hwnd;
MSG msg;
WNDCLASS wndclass;


wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))//注册窗口类
{
MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName, // window class name
TEXT("AsyncSelect Model"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters

ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);

while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
WSADATA wsd;
static SOCKET sListen;
SOCKET sClient;
SOCKADDR_IN local, client;
int ret, iAddrSize = sizeof(client);
char szMessage[MSGSIZE];


switch (message)
{
case WM_CREATE:
// Initialize Windows Socket library
WSAStartup(0x0202, &wsd);

// Create listening socket
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

// Bind
local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
local.sin_family = AF_INET;
local.sin_port = htons(PORT);
bind(sListen, (struct sockaddr *)&local, sizeof(local));

// Listen
listen(sListen, 3);

// Associate listening socket with FD_ACCEPT event
WSAAsyncSelect(sListen, hwnd, WM_SOCKET, FD_ACCEPT);
return 0;
case WM_DESTROY:
closesocket(sListen);
WSACleanup();
PostQuitMessage(0);
return 0;

case WM_SOCKET:
if (WSAGETSELECTERROR(lParam))
{
closesocket(wParam);
break;
}

switch (WSAGETSELECTEVENT(lParam))
{
case FD_ACCEPT:
// Accept a connection from client
sClient = accept(wParam, (struct sockaddr *)&client, &iAddrSize);

// Associate client socket with FD_READ and FD_CLOSE event
WSAAsyncSelect(sClient, hwnd, WM_SOCKET, FD_READ | FD_CLOSE);
break;
case FD_READ:
ret = recv(wParam, szMessage, MSGSIZE, 0);
if (ret == 0 || ret == SOCKET_ERROR && WSAGetLastError() == WSAECONNRESET)
{
closesocket(wParam);
}
else
{
szMessage[ret] = '\0';
send(wParam, szMessage, strlen(szMessage), 0);
}
break;

case FD_CLOSE:
closesocket(wParam);
break;
}
return 0;
}

return DefWindowProc(hwnd, message, wParam, lParam);
}

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