win32.cpp

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// win32.cpp : Defines the entry point for the application.
//

#include "stdafx.h"//包含有windows.h头文件
#include "resource.h"//资源头文件，包含有各个资源的ID号。

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;						// current instance
TCHAR szTitle[MAX_LOADSTRING];			// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];	// The title bar text

// Foward declarations of functions included in this code module:

BOOL				MyRegisterClass(HINSTANCE hInstance);//注册窗口类
BOOL				InitInstance(HINSTANCE, int);		 //初始化程序
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM); //主窗口函数
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);	 //两个都是CALLBACK(回调)函数

//----------------------------------------------------------------------
//程序的入口点WinMain函数
//----------------------------------------------------------------------
int CALLBACK WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	MSG msg;				//Windows的消息结构
	HACCEL hAccelTable;		//加速键表句柄（handle);

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_WIN32, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);//注册窗口类

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow)) //实例的初始化
	{
		return FALSE;
	}

	//装入加速键表。
	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WIN32);

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) //从消息队列中获取消息
	{
//		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) //解释快捷键
		{
			TranslateMessage(&msg);//解释消息
			DispatchMessage(&msg);//分派消息（到窗口函数中）；
		}
	}

	return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//

//----------------------------------------------------------------------
//注册窗口类，在产生窗口之前必须注册窗口类。
//如同开一个公司之前，先要登记注册一样。
//----------------------------------------------------------------------
BOOL MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style			= CS_HREDRAW | CS_VREDRAW;  //注册窗口的风格。
	wcex.lpfnWndProc	= (WNDPROC)WndProc;			//注册窗口函数
	wcex.cbClsExtra		= 0;						//为窗口类额外分配的字节（一般为0）
	wcex.cbWndExtra		= 0;						//为窗口实例额外分配的字节（一般为0）
	wcex.hInstance		= hInstance;				//实例句柄
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_WIN32);//大图标
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);//光标
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);//窗口背景颜色
	wcex.lpszMenuName	= (LPCSTR)IDC_WIN32;//窗口的菜单名称（与类名一致）
	wcex.lpszClassName	= szWindowClass;//窗口类名称。
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);//小图标

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
//----------------------------------------------------------------------------
//此函数用来产生窗口。
//----------------------------------------------------------------------
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(	szWindowClass, //窗口类名称
						szTitle, //窗口标题
						WS_OVERLAPPEDWINDOW,//窗口风格
						CW_USEDEFAULT, //窗口位置x，用此参数会??
						0,//窗口位置y。为什么为0？？
						CW_USEDEFAULT,//窗口宽度
						0, //窗口高度。为什么为0？？
						NULL,//窗口的父窗口指针
						NULL,//菜单指针
						hInstance,//实例指针
						NULL);//窗口创建参数

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);//显示窗口
   UpdateWindow(hWnd);//更新窗口，即通过发送WM_PAINT消息实现。

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
//----------------------------------------------------------------------
//主窗口函数（用来处理消息）
//----------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR szHello[MAX_LOADSTRING];
	LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam); 
			// Parse the menu selections:
			switch (wmId)
			{
				case IDM_ABOUT:
				   DialogBox(hInst,//所属实例
							(LPCTSTR)IDD_ABOUTBOX, //对话框资源名称。
							hWnd,//父窗口
							(DLGPROC)About);//对话框的窗口函数名称。
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);//销毁窗口。
				   break;
				default:
					//注意：不论什么消息，都必须被处理。
					//未被处理的消息由Windows系统缺省的窗口函数调用。
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_PAINT://重画
			hdc = BeginPaint(hWnd, &ps);
			// TODO: Add any drawing code here...
			RECT rt;
			GetClientRect(hWnd, &rt);
			DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY://窗口已经被销毁，程序即将结束。
			PostQuitMessage(0);
			break;
		default:
			//未被处理的消息由Windows系统缺省的窗口函数调用。
			return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
//----------------------------------------------------------------------
//处理对话框消息的窗口函数。
//----------------------------------------------------------------------
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;//FALSE表示没有处理这个消息。
}