API 中怎么用TextOut换行输出文本啊，
请编写一个程序，该程序能够将从键盘输入的普通字符以“宋体，红色，默认大小”的形式输出在窗口的客户区，窗口的客户区具有象稿纸一样的形式，即具有象下图一样的线条（颜色为纯蓝色），输入的字符都在线条之间显示，该程序每隔30秒钟自动将所有的输入清空，输入的字符个数最多为10000个，另外，该程序运行时，限制鼠标的运动情况，只要进入窗口的客户区，就只能停留在某个特定位置其他功能都差不多了，只是在输出时不能换行输出的，大家爱帮忙看看啊
源程序如下:
#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);
BOOL InitWindowsClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE hInstance,int nCmdShow);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int nCmdShow)
{
MSG Message;
if(!InitWindowsClass(hInstance))
return FALSE;
if(!InitInstance (hInstance,nCmdShow))
return FALSE;
while (GetMessage (&Message, NULL, 0, 0)) //消息循环
{
TranslateMessage (&Message) ;
DispatchMessage (&Message) ;
}
return Message.wParam ; //程序终止时将信息返回系统
}
long WINAPI WndProc(HWND hwnd,UINT iMessage,UINT wParam,LONG lParam)
{
const int BufSize = 10000; //设置存放字符的缓冲区大小
static char cCharBuf[BufSize]; // 设置静态字符数组，存放输入的字符
static int nNumChar = 0; //现有字符个数
static int nArrayPos = 0; //字符的位置
static int nLnHeight;
static int nCharWidth;
int i ,a;
POINT lt,rb;
RECT rect;
int x,y; // 鼠标位置
int X = 0,Y = 20;
HDC hdc;
HFONT h; //定义字体句柄
HPEN hP ,hPenOld; //定义画笔句柄
PAINTSTRUCT ps;
TEXTMETRIC tm; //定义一个TEXTMETRIC结构，用以记录字体信息
GetClientRect(hwnd,&rect);
switch(iMessage) // 处理消息
{
case WM_CHAR:
{
if(nNumChar >= BufSize)
{
MessageBox(hwnd,"以输入10000个字符，不能再输入字符了",NULL,MB_OK);
break;
}
for(x = nNumChar;x > nArrayPos;x = x -1)
cCharBuf[x] = cCharBuf[x-1];
cCharBuf[nArrayPos] = (unsigned char )wParam;
nArrayPos = nArrayPos + 1;
nNumChar = nNumChar + 1;
InvalidateRect(hwnd,NULL,TRUE);
}
break;
case WM_CREATE:
{
hdc = GetDC(hwnd);
h = CreateFont //创建字体
(
0,
0,
0,
0,
400,
0,
1,
0,
GB2312_CHARSET,
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
DEFAULT_QUALITY,
DEFAULT_PITCH|FF_DONTCARE,
"宋体"
);
SelectObject(hdc,h); //选入字体
GetTextMetrics(hdc,&tm); //得到包含字体信息的结构体
nLnHeight = tm.tmHeight + tm.tmExternalLeading;
nCharWidth = tm.tmAveCharWidth;
ReleaseDC(hwnd,hdc);
}
break;
case WM_KEYDOWN:
{
switch(wParam)
{
case VK_END:
nArrayPos = nNumChar;
break;
case VK_ESCAPE:
PostQuitMessage(0);
break;
}
break;
}
case WM_PAINT:
hP = CreatePen(PS_SOLID,1,RGB(0,250,0));
hPenOld = (HPEN)SelectObject(hdc,hP);
hdc = BeginPaint(hwnd,&ps);
SelectObject(hdc,hP);
SetTextColor(hdc,RGB(255,0,0)); //设置文本颜色为红色
TextOut(hdc,nCharWidth,Y,cCharBuf,nNumChar); //输出文本
// DrawText(hdc,cCharBuf,nNumChar,&rect,DT_CALCRECT);
Y = Y + tm.tmHeight+tm.tmExternalLeading; //计算换行时下一行文本的输出坐标
X++;
for( i = 0;i < 50;i++)
{
a =20;
a =(i+1)*a ;
MoveToEx(hdc,0,a,NULL);
LineTo(hdc,800,a);
}
EndPaint(hwnd,&ps);
DeleteObject(hP);
break;
case WM_MOUSEMOVE: //如果鼠标进入客户区，则固定在客户区最左上方
x = LOWORD(lParam);
y = HIWORD(lParam);
GetClientRect(hwnd,&rect);
lt.x = rect.left;
lt.y = rect.top;
rb.x = rect.right;
rb.y = rect.bottom;
ClientToScreen(hwnd,<);
ClientToScreen(hwnd,&rb);
rect.left = lt.x;
rect.top = lt.y;
rect.right = rb.x;
rect.bottom = rb.y;
if(x >= lt.x&&y >= lt.y&&x <= rb.x&&y <=rb.y)
{
SetCursorPos(lt.x,lt.y);
}
break;
case WM_TIMER:
case WM_DESTROY:
PostQuitMessage(0);
KillTimer(hwnd,1);
break;
default:
return DefWindowProc(hwnd,iMessage,wParam,lParam);
}
return 0;
}
BOOL InitInstance(HINSTANCE hInstance,int nCmdShow) //初始化窗口
{
HWND hwnd ;
hwnd = CreateWindow ( "TextOut", //窗口类名
"E06620334", //窗口实例的标题
WS_OVERLAPPEDWINDOW,
0, //窗口左上角图标
0,
600,
600, //窗口的宽和高
NULL, //窗口无父菜单
NULL, //窗口无主菜单
hInstance, //创建此窗口应用程序的当前句柄
NULL //不使用该值
) ;
if(!hwnd)
return FALSE;
ShowWindow (hwnd, nCmdShow) ; //显示窗口
UpdateWindow (hwnd) ;
SetTimer(hwnd,1,30000,NULL);
return TRUE;
}
BOOL InitWindowsClass(HINSTANCE hInstance) //定义窗口类
{
WNDCLASS wndclass;
wndclass.cbClsExtra = 0 ; //窗口类无扩展
wndclass.cbWndExtra = 0 ; //窗口实例无扩展
wndclass.hbrBackground= (HBRUSH) GetStockObject (WHITE_BRUSH) ; //窗口背景色为白色
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; //窗口采用箭头光标
wndclass.hIcon = LoadIcon (hInstance, IDI_APPLICATION) ; //窗口的最小化图标为默认图标
wndclass.hInstance = hInstance ; //当前实例句柄
wndclass.lpfnWndProc= WndProc ; //窗口处理函数为WndProc
wndclass.lpszClassName="TextOut";
wndclass.lpszMenuName = NULL ; //窗口中无菜单
wndclass.style = CS_HREDRAW | CS_VREDRAW ; //窗口类型为默认类型
return RegisterClass(&wndclass);
}
