#include
        
         	LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR lpCmdLine,int nShowCmd){	static TCHAR szAPPName[] = TEXT("MyWindows");	HWND hwnd;	MSG msg;	WNDCLASS wndclass;	wndclass.style = CS_HREDRAW | CS_VREDRAW;	wndclass.hInstance = hInstance;	wndclass.lpfnWndProc = WndProc;	wndclass.cbClsExtra = 0;	wndclass.cbWndExtra = 0;	wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);	wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);	wndclass.lpszClassName = szAPPName;	wndclass.lpszMenuName = NULL;	if(!RegisterClass(&wndclass))	{		MessageBox(NULL,TEXT("这个程序需要在 windows NT 下菜能执行！"),TEXT("错误"),MB_OK | MB_ICONERROR);		return 0;	}	hwnd = CreateWindow(szAPPName,TEXT("简单的文本编辑器"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);	ShowWindow(hwnd,nShowCmd);	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){	HDC hdc;	PAINTSTRUCT ps;	static RECT rect;	static int wordWidth,wordHeight;	TEXTMETRIC tm;	static TCHAR *p = NULL;	static int curx = 0,cury = 0;	switch(message)	{	case WM_CREATE:		hdc = GetDC(hwnd);		SelectObject(hdc,CreateFont(0,0,0,0,0,0,0,0,0,0,0,0,FIXED_PITCH,NULL));		GetClientRect(hwnd,&rect);		GetTextMetrics(hdc,&tm);		wordWidth = tm.tmAveCharWidth;		wordHeight = tm.tmHeight;		rect.left = 10;		rect.top = 30;		rect.right = rect.left + 50 * wordWidth;		rect.bottom = rect.top + 10 * wordHeight;		if(p)			free(p);		else		{			p = (TCHAR *)malloc(50 * 10 * sizeof(CHAR));		}		ReleaseDC(hwnd,hdc);		return 0;	case WM_PAINT:		hdc = BeginPaint(hwnd,&ps);		SelectObject(hdc,CreateFont(0,0,0,0,0,0,0,0,0,0,0,0,FIXED_PITCH,NULL));		TextOut(hdc,10,10,TEXT("简单的文本编辑器"),lstrlen(TEXT("简单的文本编辑器")));		SelectObject(hdc,CreatePen(PS_SOLID,2,RGB(255,0,0)));		Rectangle(hdc,rect.left,rect.top,rect.right,rect.bottom);		EndPaint(hwnd,&ps);		return 0;	case WM_KEYDOWN:		if(wparam == VK_BACK)		{			if(curx == 0 && cury == 0)				return 0;			if(curx <= 0)			{				curx = 50 - 1;				if(cury > 0)					cury--;			}			else				curx--;		}		HideCaret(hwnd);		hdc = GetDC(hwnd);		p[cury * 50 + curx] = (TCHAR)' ';		SetCaretPos(rect.left + curx * wordWidth,rect.top + cury * wordHeight);			SelectObject(hdc,CreateFont(0,0,0,0,0,0,0,0,0,0,0,0,FIXED_PITCH,NULL));		TextOut(hdc,rect.left + curx * wordWidth,rect.top + cury * wordHeight,&p[cury * 50 + curx],1);		ShowCaret(hwnd);		ReleaseDC(hwnd,hdc);		return 0;	case WM_SETFOCUS:		CreateCaret(hwnd,NULL,wordWidth / 8,wordHeight);		SetCaretPos(rect.left,rect.top);		ShowCaret(hwnd);		return 0;	case WM_KILLFOCUS:		HideCaret(hwnd);		DestroyCaret();		return 0;	case WM_CHAR:		if(wparam == 8)			return 0;		if(cury >= 10)			return 0;		HideCaret(hwnd);		p[cury * 50 + curx] = (CHAR)wparam;		hdc = GetDC(hwnd);		SelectObject(hdc,CreateFont(0,0,0,0,0,0,0,0,0,0,0,0,FIXED_PITCH,NULL));		TextOut(hdc,rect.left + curx * wordWidth,rect.top + cury * wordHeight,&p[cury*50+curx],1);		curx++;		if(curx >= 50)		{			curx = 0;			cury++;		}		SetCaretPos(rect.left + curx * wordWidth,rect.top + cury * wordHeight);		ShowCaret(hwnd);		ReleaseDC(hwnd,hdc);		return 0;	case WM_DESTROY:		PostQuitMessage(0);		return 0;	default:		return DefWindowProc(hwnd,message,wparam,lparam);	}}