WinSock学习(2):WSAAsyncSelect模型

学的比较匆忙，有错误请指出

//user define
#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")
#define BTN_1 0x01
#define WM_SOCKET WM_USER+1
#ifndef DEBUG_DISABLE
#define DEBUG_ENTERED(M)  MessageBox(NULL,\
	M,\
	"Tip",\
	MB_OK);
#else
#define DEBUG_ENTERED(M)  
#endif
 
// 全局变量:
HINSTANCE hInst;								// 当前实例
TCHAR szTitle[MAX_LOADSTRING];					// 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING];			// 主窗口类名
SOCKET sListen;
FD_SET fdset;
char writeBuf[100];
HWND hWin;
 
// 此代码模块中包含的函数的前向声明:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);
 
//初始化窗体
void CreateChildWindow(HWND hParent)
{
	RECT rect;
	GetWindowRect(hParent,&rect);
 
	HWND hBtn1=CreateWindow("BUTTON",
		"Listen",
		WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,
		(rect.right-rect.left)/2,
		(rect.bottom-rect.top)/2,
		70,25,
		hParent,
		(HMENU)BTN_1,
		hInst,
		0);
}
 
bool InitialSocket(SOCKET sock,u_short port,HWND hWnd)
{
	SOCKADDR_IN serverAddr;
	serverAddr.sin_family=AF_INET;
	serverAddr.sin_port=htons(port);
	serverAddr.sin_addr.s_addr=htonl(ADDR_ANY);
 
	char buf[200];
	if(bind(sock,PSOCKADDR(&serverAddr),sizeof(serverAddr)))
	{
		sprintf(buf,"bind error!error code:%d",WSAGetLastError());
		DEBUG_ENTERED(buf)
		WSACleanup();
		return false;
	}
 
	WSAAsyncSelect(sListen,hWnd,WM_SOCKET,FD_READ|FD_ACCEPT|FD_CLOSE);
 
	return true;
}
 
void OnLsBtnClicked()
{
	char buf[200];
	if(listen(sListen,5))
	{
		sprintf(buf,"listen error!error code:%d\n",WSAGetLastError());
		DEBUG_ENTERED(buf)
			WSACleanup();
	}
	else
	{
		sprintf(buf,"Now Listen");
		DEBUG_ENTERED(buf)
	}
}
 
void HandleSocket(WPARAM wParam,LPARAM lParam)
{
	if(WSAGETSELECTERROR(lParam))
	{
		//有错误
		closesocket((SOCKET)wParam);
		return;
	}
 
	switch(WSAGETSELECTEVENT(lParam))
	{
	case FD_ACCEPT:
		{
			SOCKET newSocket=accept((SOCKET)wParam,NULL,NULL);
			if(newSocket==INVALID_SOCKET)
			{
				DEBUG_ENTERED("INVALID SOCKET!");
				return;
			}
			FD_SET(newSocket,&fdset);
			sprintf(writeBuf,"New connection!");
			UpdateWindow(hWin);
		}
		break;
	case FD_READ:
		recv((SOCKET)wParam,writeBuf,sizeof(writeBuf),0);
		//UpdateWindow(hWin);
		SendMessage(hWin,WM_PAINT,0,0);
		break;
	case FD_CLOSE:
		sprintf(writeBuf,"Connection closed!");
		UpdateWindow(hWin);
		break;
	}
}
//程序入口
int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: 在此放置代码。
	MSG msg;
	HACCEL hAccelTable;
 
	// 初始化全局字符串
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_WSAASYNCSELECT, szWindowClass, MAX_LOADSTRING);
	FD_ZERO(&fdset);
	ZeroMemory(writeBuf,sizeof(writeBuf));
	MyRegisterClass(hInstance);
 
	// 执行应用程序初始化:
	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}
 
	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WSAASYNCSELECT);
 
	// 主消息循环:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
 
	return (int) msg.wParam;
}
 
 
 
//
//  函数: MyRegisterClass()
//
//  目的: 注册窗口类。
//
//  注释: 
//
//    仅当希望在已添加到 Windows 95 的
//    “RegisterClassEx”函数之前此代码与 Win32 系统兼容时，
//    才需要此函数及其用法。调用此函数
//    十分重要，这样应用程序就可以获得关联的
//   “格式正确的”小图标。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;
 
	wcex.cbSize = sizeof(WNDCLASSEX); 
 
	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_WSAASYNCSELECT);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= (LPCTSTR)IDC_WSAASYNCSELECT;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
 
	return RegisterClassEx(&wcex);
}
 
//
//   函数: InitInstance(HANDLE, int)
//
//   目的: 保存实例句柄并创建主窗口
//
//   注释: 
//
//        在此函数中，我们在全局变量中保存实例句柄并
//        创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;
 
   hInst = hInstance; // 将实例句柄存储在全局变量中
 
   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
 
   if (!hWnd)
   {
      return FALSE;
   }
 
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);
   hWin=hWnd;
 
   //Socket初始化
   WSADATA wsaData;
   WSAStartup(MAKEWORD(2,2),&wsaData);
   sListen=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 
   if(InitialSocket(sListen,25418,hWnd))
   {
	   MessageBox(NULL,
		   "Socket初始化成功",
		   "Tip",
		   MB_OK|MB_ICONINFORMATION);
	   FD_SET(sListen,&fdset);
   }
 
   return TRUE;
}
 
//
//  函数: WndProc(HWND, unsigned, WORD, LONG)
//
//  目的: 处理主窗口的消息。
//
//  WM_COMMAND	- 处理应用程序菜单
//  WM_PAINT	- 绘制主窗口
//  WM_DESTROY	- 发送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	RECT rect;
	GetWindowRect(hWnd,&rect);
 
	switch (message) 
	{
	case WM_CREATE:
		CreateChildWindow(hWnd);
		break;
	case WM_COMMAND:
		wmId    = LOWORD(wParam); 
		wmEvent = HIWORD(wParam); 
		// 分析菜单选择:
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		case BTN_1:
			switch(wmEvent)
			{
			case BN_CLICKED:
				OnLsBtnClicked();
				break;
			}
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		// TODO: 在此添加任意绘图代码...
		DrawText(hdc,writeBuf,-1,&rect,DT_CENTER);
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		WSACleanup();
		PostQuitMessage(0);
		break;
	case WM_SOCKET:
		HandleSocket(wParam,lParam);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}
 
// “关于”框的消息处理程序。
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
	case WM_INITDIALOG:
		return TRUE;
 
	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
		{
			EndDialog(hDlg, LOWORD(wParam));
			return TRUE;
		}
		break;
	}
	return FALSE;
}