Visual C＋＋课后习题参考答案.pdf

4-5参考答案：#include#include#include#include#define Pi 3.1415926 long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam);消息处理函数声明.BOOL InitWindowsClass(HINSTANCE hlnstance);初始化窗 口类声明BOOL InitWindows(HINSTANCE hlnstance,int nCmdShow);/初始化窗 口 声明.HWND hWndMain;int WINAPI WinMain(HINSTANCE hlnstance,HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nCmdShow)主函数(MSG Message;if(!InitWindowsClass(hInstance)初始化窗 口 类.return FALSE;if(!InitWindows(hInstance,nCmdShow)return FALSE;while(GetMessage(&Message,0,0,0)(TranslateMessage(&Message);DispatchMessage(&Message);return Mess age.wParam;)一long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONGIParam)初始化窗口.消息循环.消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;/定义性备环境句柄.定义画刷句柄定义画笔句柄定义包含绘图信息的结构体变量double dfRadious0=100.0,dfRadious 1;定义外部和内部正五边形外接圆半径.POINT lpOuterPoints5,lpInnerPoints5;定义夕卜，内正五边形点结构数组.POINT lpTriangle3;定义三角形点结构数组.dfRadiousl二dfRadious0*sin(0.1*Pi)/sin(126.0/180*Pi);根据外圆半径计算内园半径.计算内外正五边形的点坐标.for(int i=0;i5;i+)lpOuterPointsi.x=(long)(dfRadious0*cos(i*72.0/180*Pi);lpOuterPointsi.y=(long)(dfRadious0*sin(i*72.0/180*Pi);lpInnerPointsi.x=(long)(dfRadiousl*cos(i*72.0/180*Pi+36.0/180*Pi);lpInnerPointsi.y=(long)(dfRadiousl*sini*72.0/180*Pi+36.0/180*Pi);switch(iMessage)(case WM_PAINT:处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);得到设备环境句柄SetMapMode(hDC,MM_ANISOTROPIC);设置映射模式.SetWindowOrgEx(hDC,-100,-100,NULL);设置坐标原点.hPen=CreatePen(PS_SOLID,l,RGB(255,0,0);创新红色画笔.SelectObject(hDC,hPen);将画笔选入.Polygon(hDC,lpOuterPoints,5);画正五边形.填充正五边形的不同区域.for(i=0;i5;i+)(IpTriangle 0=lpOuterPoints i%5;生成图形中的三角形区域的坐标.lpTriangle l=lpInnerPoints i%5;lpTriangle2=lpOuterPoints(i+1)%5;创航新画刷.hBrush=CreateSolidBrush(RGB(i*10,i*20,i*30);SelectObject(hDC,hBrush);选入新画刷.Polygon(hDC,IpTriangle,3)；画三角形区域.lpTriangle2=lpInnerPoints(i+4)%5;生成图形中的三角形区域的坐标.hBrush=CreateSolidBrush(RGB(i*40,i*30,i*20);创新画刷.SelectObject(hDC,hBrush);选入画刷.Polygon(hDC,lpT riangle,3)；/画三角形区域.)hBrush二CreateSolidBrush(RGB(255,255,255);创新白画刷.SelectObject(hDC,hBrush);选入画刷.Polygon(hDC,lpInnerPoints,5);画中心的五边形.用不同种颜色的画笔来绘制五角星.MoveToEx(hDC,lpOuterPoints 0.x,lpOuterPoints 0.y,NULL);for(i=l;i5;i+)(hPen=CreatePen(PS_SOLID,l,RGB(0,i*51,0);S electObj e ct(hDC,hPen);LineTo(hDC,lpOuterPoints(i+2)%5.x,lpOuterPoints(i+2)%5.y);)hPen=(HPEN)(GetStockObject(PS_NULL);DeleteObject(hPen);删除画笔.DeleteObject(hBrush);删除画刷.EndPaint(hWnd,&PtStr);结束绘图.return 0;case WM_DESTROY:处理关闭窗口信息.PostQuitMessage(O);向应用程序发送 WM_QUIT 消息.return 0;default:return(DefWindowProc(hWnd,iMessage,wParam,lParam);)BOOL InitWindows(HINSTANCE hlnstance,int nCmdShow)初始化(HWND hWnd;定义窗口句柄.hWnd=CreateWindow(HPolygonn,窗 口 类名.“五边形”，窗口实例标题.WS_OVERLAPPEDWINDOW,窗口风格.带边框，标题栏,系统菜单和最大和最小按钮.CWJJSEDEFAULT,窗口左上角坐标.0,窗口左上角坐标.CW_USEDEFAULT,窗口宽度0,窗口高度NULL,无父窗口.NULL,无主菜单.hlnstance,创建此窗口的应用程序的当前句柄.NULL);指向一个传递给窗口的参数值从指针.不使用该值.if(!hWnd)如果窗口创建失败，返回false.return FALSE;hWndMain=hWnd;/将窗口句柄传递给全局变量.Sho wWindow(hWnd,nCmdShow);/显示窗 口.UpdateWindow(hWnd);更新并绘制用户 区.return TRUE;BOOL InitWindowsClass(HINSTANCE hlnstance)初始化窗 口类.WNDCLASS WndClass;WndClass.cbClsExtra=O;WndClass.cbWndExtra=O;定义窗口类.窗口类无扩展.窗口实例无扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);窗口背景为白色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);窗 口采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);窗口的最小化图标为缺省图标.WndClass.hInstance=hInstance;WndClass.lpfnWndProc=WndProc;WndClass.lpszClassName=HPolygonn;WndClass.lpszMenuName=NULL;WndClass.style=O;return RegisterClass(&WndClass);当前实例句柄.窗口处理函数.窗口类名.无菜单窗口类型为缺省类型 返回注册窗口的值.)4-6参考答案:#include#include#include#include#define Pi 3.1415926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam);消息处理函数声明.double dfTheta=0,dfRange=100.0;正弦曲线的角度变量.long i=0,j=0;long!CentreX=0,lCentreY=0,lRadious=(long)(0.2*dfRange);定义圆心坐标和圆坐标.POINT lpSin100;定义正弦曲线的点坐标.int WINAPI WinMain(HINSTANCE hlnstance,HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nCmdS how)主函数(MSG Message;定义消息变量.HWND hWnd;定义窗口句柄.WNDCLASS WndClass;WndClass.cbClsExtra=O;WndClass.cbWndExtra=O;定义窗口类.无窗口类扩展.无窗口实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);背景为白色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);窗 口 采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);采用缺省图标.WndClass.hInstance=hInstance;WndClass.lpfnWndProc=WndProc;WndClass.lpszClassName=nSIN;WndClass.lpszMenuName=NULL;WndClass.style=O;当前应用程序句柄.窗口处理函数.窗口类名称.无窗口菜单.窗口类型为缺省类型.if(!RegisterClass(&WndClass)|MessageBeep(O);return FALSE;)注册窗口.hWnd=CreateWindo w(HSINn,窗口类名.“4_6”，标题名.WS_OVERLAPPEDWINDOW,带标题栏，最大和最小按钮的窗口.CW_USEDEFAULT,窗口左上角坐标.0,一CW_USEDEFAULT,采用缺省的宽度和高度.0,NULL,无父窗口.NULL,无主菜单.hlnstance,当前实例句柄.NULL);不要此参数.ShowWindow(hWnd,nCmdShow);显示窗口.Update Window(hW nd);更新并绘制用户区.for(intj=0;j100;j+)生成正弦曲线的点坐标.(lpSinj.x=(long)(j*2*Pi/100*60);lpSinj.y=(long)(dfRange*sin(j*2*Pi/100);while(GetMessage(&Message,0,0,0)(TranslateMessage(&Message);DispatchMessage(&Message);)return Message.wParam)消息循环.long WIN API WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam)消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;定义芭备环境句柄.定义画刷句柄定义画笔句柄定义包含绘图信息的结构体变量s wit ch(iMes sage)(case WM_PAINT:处理绘图消息、.hDC=BeginPaint(hWnd,&PtStr);获得设备环境指针.SetWindowOrgEx(hDC,-200,-200,NULL);设置原点坐标为(-200,-200)hPen=CreatePen(PS_DASH,1,RGB(255,0,0);创新画笔.SelectObject(hDC,hPen);选入画笔.Polyline(hDC,lpSin,100);绘制正弦曲线.if(iv=25)/第一个 1/4周期.(hPen=CreatePen(PS_DASH,1,RGB(255,0,0);/创新 红笔.hBrush=CreateHatchBrush(HS_BDIAGONAL,RGB(255,0,0);创新红画刷.lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);计算半径.)else if(iv=50)第二个 1/4周期.hPen二CreatePen(PS_DASH,l,RGB(0,255,0);创新绿笔.hBrush=CreateHatchBrush(HS_DIAGCROSS,RGB(0,255,0);创新绿刷.lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);计算半径.else if(iv=75)第三个周期.(hPen二CreatePen(PS_DASH,l,RGB(0,0,255);创新蓝笔hBrush=CreateHatchBrush(HS_CROSS,RGB(0,0,255);创新蓝刷.lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);计算半径.else/第四个周期.hPen=CreatePen(PS_DASH,1,RGB(255,255,0);创新黄笔hBrush=CreateHatchBrush(HS_VERTICAL,RGB(255,255,0);创新黄刷.lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);/计算半径.)SelectObject(hDC,hBrush);SelectObgect(hDC,hPen);!CentreX=lpSini.x;ICentreY=lpSini.y;选入画刷.选入画笔.圆心x坐标.圆心y坐标.Ellipse(hDC,lCentreX-lRadious,lCentreY-lRadious,ICentreX+lRadious,ICentreY+lRadious);画圆.i+;DeleteObject(hPen);删除画笔.DeleteObject(hBrush);删除画刷.EndPaint(hWnd,&PtS tr);删除设备环境指针.Sleep(lOO);停 0.1秒.if(i100)InvalidateRect(hWnd,NULL,1);刷新用户区.return 0;case WM_DESTROY:关闭窗口.PostQuitMessage(O);return 0;default:return(DefWindowProc(hWnd,iMessage,wPar am,IP aram);)4-7参考答案：#include#include#include#include#define Pi 3.1415926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam);int WINAPI WinMain(HINSTANCE hlnstance,消息处理函数声明.HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nCmdShow)主函数MSG Message;HWND hWnd;定义消息变量.定义窗口句柄.WNDCLASS WndClass;WndClass.cbClsExtra=0;WndClass.cbWndExtra=0;定义窗口类.无窗口类扩展.无窗口实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);/背景为白色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);窗 口 采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);采用缺省图标.WndClass.hlnstance=hlnstance;WndClass.lpfnWndProc=WndProc;WndClass.lpszClassName=H4_7;WndClass.lpszMenuName=NULL;WndClass.style=O;当前应用程序句柄.窗口处理函数.窗口类名称.无窗口菜单.窗口类型为缺省类型.if(!RegisterClass(&WndClass)注册窗口.MessageBeep(O);return FALSE;)hWnd=CreateWindo w(n4_7n,n4_7n,窗口类名.标题名.WS_OVERLAPPEDWINDOW,带标题栏，最大和最小按钮的窗口.CW_USEDEFAULT,窗口左上角坐标.0,600,450,NULL,NULL,hlnstance,NULL);ShowWindow(hWnd,nCmdShow);UpdateWindow(hW nd);采用宽度为450,高度为600.无父窗口.无主菜单.当前实例句柄.不要此参数./显示窗口.更新并绘制用户区.while(GetMessage(&Message,0,0,0)TranslateMessage(&Message);DispatchMessage(&Message);return Message.wParam;)消息循环.long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam)消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;/定义性备环境句柄.定义画刷句柄定义画笔句柄定义包含绘图信息的结构体变量s wit ch(iMes sage)case WM_PAINT:处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);获得设备环境指针.SetMapMode(hDC,MM_ANISOTROPIC);设置映射模式.SetWindowExtEx(hDC,300,300,NULL);设置窗口 区域.逻辑单位.SetViewportExtEx(hDC,600,600,NULL);设置视 口 区域.物理单位.SetViewportOrgEx(hDC,0,0,NULL);设置视 口原点坐标为(0,0).物理单位.绘制四个圆形.(笔的样式不同)hBrush=(HBRUSH)GetStockObject(NULL_BRUSH);选择空画刷.SelectObject(hDC,hBrush);hPen=CreatePen(PS_DASH,0,RGB(255,0,0);建立虚线样式的红色笔SelectObject(hDC,hPen);选入设备环境.Ellipse(hDC,0,0,70,70);画圆.hPen=CreatePen(PS_D ASHDOT,0,RGB0,255,0);建立点划线样式的绿色笔SelectObject(hDC,hPen);Ellipse(hDC,25,0,95,70);画圆.hPen=CreatePen(PS_D ASHDOTDOT,0,RGB(0,0,255);/建立双点划线样式的蓝色笔S electObj e ct(hDC,hPen);Ellipse(hDC,0,25,70,95);hPen=CreatePen(PS_DOT,0,RGB(0,255,255);建立点线样式的天蓝色笔SelectObject(hDC,hPen);Ellipse(hDC,25,25,95,95);画6个圆角矩形.(实画刷样式不同.)hPen=HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);hBrush=(HBRUSH)GetStockObject(BLACK_BRUSH);选择黑画刷.SelectObject(hDC,hBrush);选入设备环境.RoundRect(hDC,120,0,165,45,10,10);画圆角矩形.hBrush=(HBRUSH)GetStockObject(DKGRAY_BRUSH);选择深灰画刷.SelectObject(hDC,hBrush);RoundRect(hDC,165,0,210,45,10,10);hBrush=(HBRUSH)GetStockObject(GRAY_BRUSH);选择灰画刷.SelectObject(hDC,hBrush);RoundRect(hDC,210,0,255,45,10,10);hBrush=(HBRUSH)GetStockObject(HOLLOW_BRUSH);选择虚画刷.SelectObgect(hDC,hBrush);RoundRect(hDC,120,45,165,90,10,10);hBrush=(HBRUSH)GetStockObject(LTGRAY_BRUSH);选择亮灰画刷.SelectObject(hDC,hBrush);RoundRect(hDC,165,45,210,90,10,10);hBrush=(HBRUSH)GetStockObject(WHITE_BRUSH);选择白画刷.SelectObject(hDC,hBrush);RoundRect(hDC,210,45,255,90,10,10);画6个矩形.(画刷阴影样式不同.)hPen=(HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);hBrush 二 CreateHatchBnish(HS_BDIAGONAL,RGB(200,200,200);创建45度左上右下 阴影线SelectObject(hDC,hBrush);选入设备环境Rectangle(hDC,120,90,165,135);画矩形.hBrush 二 CreateHatchBrush(HS_DIAGCROSS,RGB(200,200,200);创建45度交叉线 SelectObject(hDC,hBrush);Rectangle(hDC,165,90,210,135);hBrush=CreateHatchBrush(HS_FDIAGONAL,RGB(200,200,200);创建 45 度左下右上 阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,210,90,255,135);hBrush 二 CreateHatchBrush(HS_CROSS,RGB(200,200,200);创建垂直相交阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,120,135,165,175);hBrush=CreateHatchBrush(HS_HORIZONTAL,RGB(200,200,200);创建水平阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,165,135,210,175);hBrush=CreateHatchBrush(HS_VERTICAL,RGB(200,200,200);创建垂直阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,210,135,255,175);画饼图。hPen=(HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);hBrush=CreateSolidBrush(RGB(255,0,0);创建红色画刷。SelectObject(hDC,hBrush);选入设备环境。Pie(hDC,10,100,画饼图。100,190,(int)(55+45*cos(2*Pi/3),(int)(145+45*sin(2*Pi/3),(int)(55+45*cos(0),(int)(145+45*sin(0);hBrush=CreateSolidBrush(RGB(0,255,255);创建天蓝色画刷。SelectObject(hDC,hBrush);选入设备环境。Pie(hDC,10,100,100,190,(int)(55+45*cos(4*Pi/3),(int)(145+45*sin(4*Pi/3),(int)(55+45*cos(2*Pi/3),(int)(145+45*sin(2*Pi/3);hBrush=CreateSolidBrush(RGB(255,255,0);创建黄色画刷。SelectObject(hDC,hBrush);选入设备环境。Pie(hDC,10,100,100,190,(int)(55+45*cos(2*Pi),(int)(145+45*sin(2*Pi),(int)(55+45*cos(4*Pi/3),(int)(145+45*sin(4*Pi/3);EndPaint(hWnd,&PtStr);释放环境指针。return 0;case WM_DESTROY:关闭窗口.PostQuitMessage(O);return 0;default:return(DefWindowProc(hWnd,iMessage,wParam,lParam);)4-8参考答案：#include#include#include#include#define Pi 3.1415926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam);消息处理函数声明.int nNum=0,nMaxNum=20;nMaxNum记录了叶片循环一周中绘图的次数./nNum记录了当前的序数.int WINAPI WinMain(HINSTANCE hlnstance,HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nCmdShow)主函数(MSG Message;定义消息变量.HWND hWnd;定义窗口句柄.WNDCLASS WndClass;WndClass.cbClsExtra=O;WndClass.cbWndExtra=O;定义窗口类.无窗口类扩展.无窗口实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);背景为白色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);窗 口 采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);采用缺省图标.WndClass.hlnstance=hlnstance;WndClass.lpfnWndProc=WndProc;WndClass.lpszClassName=n4_8n;WndClass.lpszMenuName=NULL;WndClass.style=O;当前应用程序句柄.窗口处理函数.窗口类名称.无窗口菜单.窗口类型为缺省类型.if(!RegisterClass(&WndClass)(MessageBeep(O);return FALSE;)注册窗口.hWnd=CreateWindo w(n4_8n,“4_8”，窗口类名.标题名.WS_OVERLAPPEDWINDOW,带标题栏,最大和最小按钮的窗口.CW USEDEFAULT,窗口左上角坐标0,600,450,NULL,NULL,hlnstance,NULL);ShowWindow(hWnd,nCmdShow);UpdateWindow(hW nd);采用宽度为450,高度为600.无父窗口.无主菜单.当前实例句柄.不要此参数.显示窗口.更新并绘制用户区.while(GetMessage(&Message,0,0,0)(TranslateMessage(&Message);DispatchMessage(&Message);)return Message.wParam;).long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam)消息循环.消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;定义备环境句柄.定义画刷句柄/定义画笔句柄定义包含绘图信息的结构体变量int nCentreX,nCentreY;/定义3个叶片的圆心的坐标.double fAngle;s wit ch(iMes sage)(case WM_PAINT:处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);获得设备环境指针.SetMapMode(hDC,MM_ANISOTROPIC);设置映射模式.SetWindowExtEx(hDC,400,300,NULL);设置窗 口 区域.逻辑单位.SetViewportExtEx(hDC,600,450,NULL);设置视 口 区域.物理单位.SetViewportOrgEx(hDC,300,200,NULL);设置视 口原点坐标为(300,200).物理单位.绘制外圆。hPen=(HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);Ellipse(hDC,-100,-100,100,100);绘制风车的叶片。hBrush=CreateSolidBrush(RGB(255,0,0);画红色的叶片.SelectObject(hDC,hBrush);fAngle=2*Pi/nMaxNum*nNum;nCentreX=(int)(50*cos(fAngle);nCentreY=(int)(50*sin(fAngle);Pie(hDC,nCentreX-50,nCentreY-50,nCentreX+50,nCentreY+50,(int)(nCentreX4-50*cos(fAngle),(int)(nCentreY+50*sin(fAngle),(int)(nCentreX+50*cos(fAngle+Pi),(int)(nCentreY+50*sin(fAngle4-Pi);hBrush=CreateSolidBrush(RGB(255,255,0);画天蓝色的叶片.SelectObject(hDC,hBrush);nCentreXint)(50*cos(fAngle+2*Pi/3);nCentreY=(int)(50*sin(fAngle+2*Pi/3);Pie(hDC,nCentreX-50,nCentreY-50,nCentreX+50,nCentreY+50,(int)(nCentreX+50*cos(fAngle+2*Pi/3),(int)(nCentreY+50*sin(fAngle+2*Pi/3)?(int)(nCentreX+50*cos(fAngle+Pi4-2*Pi/3),(int)(nCentreY+50*sin(fAngle+Pi4-2*Pi/3);hBrush=CreateSolidBrush(RGB(0,255,255);画黄色的叶片.SelectObject(hDC,hBrush);nCentreX=(int)(50*cos(fAngle+4*Pi/3);nCentreY=(int)(50*sin(fAngle+4*Pi/3);Pie(hDC,nCentreX-50,nCentreY-50,nCentreX+50,nCentreY+50,(int)(nCentreX4-50*cos(fAngle+4*Pi/3),(int)(nCentreY+50*sin(fAngle4-4*Pi/3),(int)(nCentreX+50*cos(fAngle+Pi+4*Pi/3),(int)nCentreY+50*sin(fAngle+Pi+4*Pi/3);nNum+;当前序数加1.Sleep(lOO);等待 0.1秒.InvalidateRect(hWnd,NULL,1);/重绘窗 口 区域.EndPaint(hWnd,&PtStr);释放环境指针。return 0;case WM_DESTROY:关闭窗口.PostQuitMessage(O);return 0;default:return(DefWindo wProc(h Wnd,iMe ss age,wParam,IParam);4-9参考答案：#include#define ID_TIMER 1LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE hlnstance,HINSTANCE hPrevInstance,LPSTR IpszCmdParam,int nCmdShow)static char szAppName=HTimerl;HWND hwnd;MSG msg;WNDCLASS wndclass;if(JhPrevInstance)wndclass.style wndclass.lpfnWndProc wndclass.cbClsExtra wndclass.cbW ndExtra wndclass.hlnstance wndclass.hlcon wndclass.hCursor=CS_HREDRAW I CS_VREDRAW;=WndProc;=0;=0;=hlnstance;=Loadicon(NULL,IDI_APPLICATION);=LoadCursor(NULL,IDC_ARROW);wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.lpszMenuName=NULL;wndclass.lpszClassName=szAppName;RegisterClass(&wndclass);)hwnd=CreateWindow(szAppName,nTimerl Demo Program,WS_OVERLAPPED WINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hlnstance,NULL);while(JSetTimer(hwnd,ID_TIMER,1000,NULL)产生一个特殊的时间值/if(IDCANCEL=MessageBox(hwnd,nToo many clocks or timers!n,szAppName,MBJCONEXCLAMATION I MB_RETRYCANCEL)本题中，MBJCONEXCLAMATION表示对话框图标为惊叹号，MB_RETRYCANCEL表示对话框包含RETRY和CANCEL两个按钮return FALSE;ShowWindow(hwnd,nCmdShow);Update Window(hwnd);while(GetMessage(&msg,NULL,0,0)TranslateMessage(&msg);DispatchMessage(&msg);)return msg.wParam;)-LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM