Windows程序运行过程

Windows应用程序:

WinMain函数(入口函数):

1。设计窗口类,注册窗口类;WNDCLASS

2。创建窗口,显示及更新窗口;

3。消息循环;

窗口过程函数(回调函数):WindowProc

PS:Dos程序入口函数为main,Windows程序入口为WinMain,都是由系统直接调用。

windows程序运行过程

#include<windows.h>
#include<stdio.h>

LRESULT CALLBACK WinSunProc(     //窗口过程函数(回调函数)声明							
	HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
);

int WINAPI WinMain(            //WinMain函数,windows应用程序的入口
	HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow
)
{
	WNDCLASS wndcls;          //实例化一个窗口类对象,并设置各个属性
	wndcls.cbClsExtra = 0;
	wndcls.cbWndExtra = 0;
	wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
	wndcls.hCursor = LoadCursor(NULL,IDC_CROSS);
	wndcls.hIcon = LoadIcon(NULL,IDI_ERROR);
	wndcls.hInstance = hInstance;
	wndcls.lpfnWndProc = WinSunProc;
	wndcls.lpszClassName = "hepengtao";
	wndcls.lpszMenuName = NULL;
	wndcls.style = CS_HREDRAW | CS_VREDRAW;

	RegisterClass(&wndcls);  //注册窗口类

	HWND hwnd;
	hwnd = CreateWindow("hepengtao","窗口标题",WS_OVERLAPPEDWINDOW,  //创建窗口
		0,0,600,400,NULL,NULL,hInstance,NULL);

	ShowWindow(hwnd,SW_SHOWNORMAL);  //显示窗口
	UpdateWindow(hwnd);             //更新窗口

	MSG msg;
	while(GetMessage(&msg,NULL,0,0)) //从消息队列中取出消息,当得到 WM_QUIT 消息时返回0
	{
		TranslateMessage(&msg);//按下键盘按键时,系统得到 WM_KEYDOWN 和 WM_KEYUP 消息,经过该函数转变为 WM_CHAR 消息
		DispatchMessage(&msg); //将得到的消息传递给回调函数
	}
	return 0;
}

LRESULT CALLBACK WinSunProc(		//定义窗口过程函数(回调函数)					
	HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
)
{
	switch(uMsg)
	{
	case WM_CHAR:  //键盘按下字母后,发送 WM_CHAR 消息
		char szChar[20];
		sprintf(szChar,"char is %d",wParam);
		MessageBox(hwnd,szChar,"弹窗标题",0);
		break;
	case WM_LBUTTONDOWN:  //鼠标左键按下后,发送 WM_LBUTTONDOWN 消息
		MessageBox(hwnd,"mouse clicked","弹窗标题",0);
		HDC hdc;
		hdc = GetDC(hwnd);
		TextOut(hdc,0,50,"I am hepengtao.",strlen("I am hepengtao."));
		ReleaseDC(hwnd,hdc);
		break;
	case WM_PAINT:   //窗口重绘时,发送 WM_PAINT 消息
		HDC hDC;
		PAINTSTRUCT ps;
		hDC = BeginPaint(hwnd,&ps);
		TextOut(hDC,0,0,"Hello,world!",strlen("Hello,world!"));
		EndPaint(hwnd,&ps);
		break;
	case WM_CLOSE:  //关闭按钮按下后,发送 WM_CLOSE 消息
		if(IDYES == MessageBox(hwnd,"确定要关闭窗口?" ,"弹窗标题",MB_YESNO))
		{
			DestroyWindow(hwnd); //销毁窗口,并发送 WM_DESTORY 消息
		}
		break;
	case WM_DESTROY: //执行DestoryWindow()函数时,发送 WM_DESTORY 消息
		PostQuitMessage(0); //程序请求退出,发送 WM_QUIT 消息
		break;
	default:
		return DefWindowProc(hwnd,uMsg,wParam,lParam); //用户不关心的消息,由操作系统缺省处理
	}
	return 0;
}


Windows程序运行过程

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