windows消息机制

#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);					//窗口函数说明
//---------------以下初始化窗口类----------------------
int WINAPI WinMain(HINSTANCE hInstance,           //窗口函数说明
				   HINSTANCE hPrevInst,
				   LPSTR	 lpszCmdLine,
				   int		 nCmdShow)
{
		HWND	hwnd;
		MSG		msg;
		WNDCLASS wndclass;
		char	lpszClassName[]="窗口";			//窗口类名
		char	lpszTitle[]="My_Windows";		//窗口标题
		//窗口类的定义
		wndclass.style = 0;									//窗口类型为默认类型
		wndclass.lpfnWndProc = WndProc;						//窗口处理函数为WndProc
		wndclass.cbClsExtra = 0;							//窗口类无扩展
		wndclass.cbWndExtra = 0;							//窗口实例无扩展
		wndclass.hInstance = hInstance;						//当前实例句柄 
		wndclass.hIcon = LoadCursor(NULL,IDI_APPLICATION);	//窗口的最小化图标为默认图标
		wndclass.hCursor = loadCursor(NULL,IDC_ARROW);		//窗口采用箭头光标
		wndclass.hbrBackground = GetStockobject(WHITE_BRUSH);//	窗口背景为白色
		wndclass.lpsMenuName = NULL;						//窗口中无菜单
		wndclass.lpszClassName = lpszClassName;				//窗口类名为"窗口示例"
//-------------------------------------以下进行窗口类的注册------------------------------------
		if (! registerClass(&wndclass))						//如果注册失败则发出警告
		{
			MessageBeep(0);
			return FALSE;
		}


		//创建窗口
		hwnd = CreateWindow(lpszClassName,					//窗口类名
							lpszTitle,						//窗口实例的标题名
							WS_OVERLAPPEDWINDOW				//窗口的风格
							CW_USEDEFAULT,
							CW_USEDEFAULT,					//窗口左上角坐标为默认值
							CW_USEDEFAULT,
							CW_USEDEFAULT,					//窗口的高和宽为默认值
							NULL,
							NULL,
							hInstance,						//创建此窗口的应用程序的当前句柄
							NULL);
		//显示窗口
		ShowWindow(hwnd,nCmdShow);
		//绘制用户区
		UpdateWindow(hwnd);
		//消息循环
		while(GetMessage(&Msg,NULL,0,0))
		{
			TranslateMessage(&Msg);
			DispatchMessage(&Msg);

		}
		return Msg.wParam;

}



//
LRESULT CALLBACK WndProc(HWND hwnd,
						 UINT message,
						 WPARAM wParam,
						 LPARAM lParam)
{
	switch (message)
	{
	case WM_D	ESTROY:
		PostQuitMessage(0);
	default:
		return	DefWindowProc(hwnd,message,wParam,lParam);


	}	
	return 0;




#include <windows.h>

LRESULT CALLBACK  WndProc(HWND hwnd , UINT message ,WPARAM wParam,LPARAM lParam){
	switch (message){
	case WM_PAINT: {
			HDC hdc;
		    PAINTSTRUCT    ps;
            hdc = BeginPaint(hwnd,&ps);
			TextOut(hdc,10,20,"haha" ,28);
			EndPaint(hwnd,&ps);
			return 0;
				   }
	case WM_DESTROY:{
			PostQuitMessage(0);
			return 0;
					}
		}
	return DefWindowProc(hwnd ,message ,wParam ,lParam);
//	return 0;
		};
					
BOOL RegisterClassB(CONST WNDCLASS *lpWndClass);
int WINAPI WinMain(HINSTANCE hThisInst ,HINSTANCE hPrevInst  ,LPSTR lpszCmdLine ,int nShowCmd);
HWND CreateWindowB 
	(
		LPCTSTR lpszClassName ,
		LPCTSTR lpszTitle ,
		DWORD dwStyle ,
		int x ,  int y ,
		int nWidth ,  int  nHeight ,
		HWND hwndParent ,
		HMENU hMenu ,		
		HINSTANCE hInstance ,
		LPVOID lpParame
		);

int APIENTRY WinMain(
					 HINSTANCE hInstance,HINSTANCE hPrevInstance ,LPSTR lpCmdLine , int nCmdShow)
{

 WNDCLASS wndclass;
 HWND hwnd;
 MSG msg;

/*
 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(1);
*/
		wndclass.style = 0;									//窗口类型为默认类型
		wndclass.lpfnWndProc = WndProc;						//窗口处理函数为WndProc
		wndclass.cbClsExtra = 0;							//窗口类无扩展
		wndclass.cbWndExtra = 0;							//窗口实例无扩展
		wndclass.hInstance = hInstance;						//当前实例句柄 
		wndclass.hIcon = LoadCursor(NULL,IDI_APPLICATION);	//窗口的最小化图标为默认图标
		wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);		//窗口采用箭头光标
		wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);//	窗口背景为白色
		wndclass.lpszMenuName = NULL;						//窗口中无菜单
		wndclass.lpszClassName = "windwos";				//窗口类名为"窗口示例"


	if (! RegisterClass(&wndclass))						//如果注册失败则发出警告
	{
		MessageBeep(0);
		return FALSE;
	}
/*
		hwnd = CreateWindow("lpszClassName",					//窗口类名
							"lpszTitle",						//窗口实例的标题名
							WS_OVERLAPPEDWINDOW,			//窗口的风格
							CW_USEDEFAULT,
							CW_USEDEFAULT,					//窗口左上角坐标为默认值
							CW_USEDEFAULT,
							CW_USEDEFAULT,					//窗口的高和宽为默认值
							NULL,
							NULL,
							hInstance,						//创建此窗口的应用程序的当前句柄
							NULL
							);
*/

		hwnd = CreateWindow(
			"windwos" , 
			"窗口创建" ,
         WS_OVERLAPPEDWINDOW ,
		 CW_USEDEFAULT , CW_USEDEFAULT,
		 CW_USEDEFAULT , CW_USEDEFAULT,
		 NULL ,
		 NULL ,
		 hInstance ,
		 NULL			);

		ShowWindow(hwnd,nCmdShow);

		UpdateWindow(hwnd);

while(GetMessage (&msg ,NULL ,0,0))
{

	TranslateMessage(&msg);
	DispatchMessage(&msg);

}
return msg.wParam;
}