第六章 Windows应用程序对键盘与鼠标的响应 P121 6-8

基于键盘与鼠标应用的程序设计

一、实验目的

1．掌握键盘与鼠标在应用程序中的消息响应机制。

 

二、实验内容及步骤

实验任务

1.熟悉键盘的消息响应；

2.熟悉鼠标的消息响应；

实验内容

设计一个窗口，再该窗口中练习键盘的响应，要求如下：

(1)单机键盘上的向上箭头时，窗口中显示“You had hitted the up key”;

(2)单击Shift键时，窗口中显示“You had hitted the Shift key”；

(3)单击Ctrl键时，窗口中显示“You had hitted the Ctrl key”；

(4)单击Ctrl+A键时，窗口中显示“You had hitted the Ctrl A key”；

(5)单击Shift+B键时，窗口中显示“You had hitted the Shift B key”；

程序代码：

#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 InitWindows(HINSTANCE hInstance,int nCmdShow);

HWND hWndMain;

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,

int nCmdShow)

{

MSG Message;

if(!InitWindowsClass(hInstance))

return FALSE;

if(!InitWindows(hInstance,nCmdShow))

return FALSE;

while(GetMessage(&Message,0,0,0))//消息循环

{

TranslateMessage(&Message);

DispatchMessage(&Message);

}

return Message.wParam;

}

long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)

{

HDC hDC;   //定义指向设备上下文的句柄

PAINTSTRUCT ps; //定义指向包含绘图信息的结构体变量

HPEN hPen;                             //定义画笔句柄

HBRUSH hBrush;                          //定义画刷句柄

//以下定义输出的字符串

static char cUp[]="You had hitted the UP key";

static char cCtrl[]="You had hitted the Ctrl key";

static char cShift[]="You had hitted the SHIFT key";

static char cCtrl_A[]="You had hitted the CTRL A key";

static char cShift_B[]="You had hitted the SHIFT B key";

//下面定义并初始化按键标志变量

static BOOL nUpKeyDown=FALSE,

nShiftKeyDown=FALSE,

nCtrlKeyDown=FALSE,

nCtrlAKeyDown=FALSE,

nShiftBKeyDown=FALSE;

switch(iMessage)

{

case WM_KEYDOWN:

{

switch(wParam)

{

case VK_UP:               //当按上箭头键时，变量置为真

nUpKeyDown = TRUE;

break;

case VK_SHIFT:                   //当按Shift键时，变量置为真

nShiftKeyDown = TRUE;

break;

case VK_CONTROL:                    //当按Control键时，变量置为真

nCtrlKeyDown = TRUE;

break;

default:

break;

}

}

break;

case WM_KEYUP:

InvalidateRect(hWnd,NULL,FALSE);      //人为    方框覆盖       // InvalidateRect(hWnd,NULL,1);刷新用户区

// InvalidateRect(hWnd,NULL,0);不擦除背景

break;

case WM_CHAR:

if(wParam==(65&VK_CONTROL))

{

if(nCtrlKeyDown == TRUE)

{

nCtrlAKeyDown = TRUE;

nCtrlKeyDown = FALSE;

}

}

else if(wParam==98||wParam==66)        //当按下b键时

{

if(nShiftKeyDown == TRUE)                 //检查Shift键是否处于按下状态。

{

nShiftBKeyDown = TRUE;  //当Shift键按下时，变量置为真

nShiftKeyDown = FALSE;

}

}

break;

case WM_PAINT:                                                      //处理绘图消息.

hDC=BeginPaint(hWnd,&ps);

hBrush = (HBRUSH)GetStockObject(WHITE_BRUSH); //创建 白画刷。

hPen = (HPEN)GetStockObject(WHITE_PEN);                 //创建白画笔。

SelectObject(hDC,hPen);                                   //选入白画刷

SelectObject(hDC,hBrush);                      //选入白画笔

SetTextColor(hDC,RGB(255,0,0));                   //设置字体颜色为红色。

//输出信息。

if(nUpKeyDown == TRUE)

{

Rectangle(hDC,0,0,300,200);

TextOut(hDC,0,0,cUp,strlen(cUp));

nUpKeyDown = FALSE;

}

else if(nCtrlAKeyDown == TRUE)

{

Rectangle(hDC,0,0,300,200);

TextOut(hDC,0,100,cCtrl_A,strlen(cCtrl_A));

nCtrlAKeyDown = FALSE;

nCtrlKeyDown = FALSE;

}

else if(nCtrlKeyDown == TRUE&&nCtrlAKeyDown == FALSE)

{

Rectangle(hDC,0,0,300,200);

TextOut(hDC,0,60,cCtrl,strlen(cCtrl));

nCtrlKeyDown = FALSE;

}

else if(nShiftBKeyDown == TRUE)

{

Rectangle(hDC,0,0,300,200);

TextOut(hDC,0,0,cShift_B,strlen(cShift_B));

nShiftBKeyDown = FALSE;

nShiftKeyDown = FALSE;   }

else if(nShiftBKeyDown == FALSE&&nShiftKeyDown == TRUE)

{

Rectangle(hDC,0,0,300,200);

TextOut(hDC,0,0,cShift,strlen(cShift));

nShiftKeyDown = FALSE;

}

else        //删除画笔和画刷

{

printf("Input Error !\n");

break;

}

DeleteObject(hPen);

DeleteObject(hBrush);

EndPaint(hWnd,&ps);

break;

case WM_DESTROY:

PostQuitMessage(0);

return 0;

default:

return(DefWindowProc(hWnd,iMessage,wParam,lParam));

}

return 0;

}

BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)

{

HWND hWnd;

hWnd=CreateWindow("6_3",

"键盘实例程序",

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT,

0,

CW_USEDEFAULT,

0,

NULL,

NULL,

hInstance,

NULL);

if(!hWnd)

return FALSE;

hWndMain=hWnd;

ShowWindow(hWnd,nCmdShow);

UpdateWindow(hWnd);

return TRUE;

}

BOOL InitWindowsClass(HINSTANCE hInstance)

{

WNDCLASS WndClass;

WndClass.cbClsExtra=0;

WndClass.cbWndExtra=0;

WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH)); WndClass.hCursor=LoadCursor(NULL,IDC_ARROW); WndClass.hIcon=LoadIcon(NULL,"END");

WndClass.hInstance=hInstance;

WndClass.lpfnWndProc=WndProc;

WndClass.lpszClassName="6_3";

WndClass.lpszMenuName=NULL;

WndClass.style=CS_HREDRAW|CS_VREDRAW;

return RegisterClass(&WndClass);

WndClass.style=0;

}

程序运行结果：

三、实验结果

通过本次试验我了解了基于键盘与鼠标应用的程序设计，熟悉了键盘的消息响应以及鼠标的消息响应，了解了关于窗口的相关操作。