用VC50实现对游戏杆的编程.docx

1、用VC50实现对游戏杆的编程用VC5.0实现对游戏杆的编程 在WINDOWS95/98中有一个JoystickProperties(游戏杆属性)控制面板。只要你拥有一个支持Joystick连接口的声卡和一个游戏杆，你就能享受它提供的强大功能。在此介绍给大家如何用Visual C+来实现对游戏杆的编程，希望能对大家有所帮助。一 捕获与释放游戏杆那么如何用Visual C+5.0来实现对游戏杆的编程呢?首先必须能捕获游戏杆。在这里我们使用joySetCapture函数来实现这一点。下面是joySetCapture函数的定义及其每个参数的描述。int joySetCapture（HWND hwnd，

2、UNIT uJoyID，UNIT uPeriod，Bool fChanged）；1 Hwnd -父窗口句柄。2 uJoyID-指定游戏杆，它可以是JOYSTICKID1或JOYSTICKID2。3 uPeriod-每隔给定的轮询间隔就给应用程序发送有关游戏杆的信息。这个参数 是以微妙为单位的轮询频率。以下为捕获游戏杆消息的程序代码int CJaystickDlg:OnCreate(LPCREATESTRUCT lpCreateStruct) int result;if (CDialog:OnCreate(lpCreateStruct) = -1)return -1;result=joySetC

3、apture(CDialog:m_hWnd, JOYSTICKID1, 0, FALSE);if(result=JOYERR_NOCANDO)MessageBeep(MB_ICONEXCLAMATION);MessageBox(不能捕获游戏杆, NULL, MB_OK | MB_ICONEXCLAMATION);return -1;if(result=JOYERR_UNPLUGGED)MessageBeep(MB_ICONEXCLAMATION);MessageBox(游戏杆未与系统连接, NULL, MB_OK | MB_ICONEXCLAMATION);return -1;return 0

4、;一旦开始捕获游戏杆消息,就可以检查从设备返回的消息。为了捕获游戏杆消息我们编写了一个WindowProc过程，程序清单如下：LRESULT CJaystickDlg:WindowProc(UINT message, WPARAM wParam, LPARAM lParam) switch(message)case MM_JOY1BUTTONDOWN :if (wParam & JOY_BUTTON1)MessageBeep(MB_ICONQUESTION);SetDlgItemText(IDC_BUTTON1,Button 1: );if (wParam & JOY_BUTTON2)Mess

5、ageBeep(MB_ICONEXCLAMATION);SetDlgItemText(IDC_BUTTON2,Button 2: );break;case MM_JOY1BUTTONUP :if (wParam & JOY_BUTTON1)SetDlgItemText(IDC_BUTTON1,Button 1: );SetDlgItemText(IDC_BUTTON2,Button 2:);else if (wParam & JOY_BUTTON2)SetDlgItemText(IDC_BUTTON2,Button 2: );SetDlgItemText(IDC_BUTTON1,Button

6、1:);elseSetDlgItemText(IDC_BUTTON1,Button 1:);SetDlgItemText(IDC_BUTTON2,Button 2:);break;case MM_JOY1MOVE :WORD x, y;POINT pt;UpdateData(TRUE);/获取当前屏幕光标位置GetCursorPos(&pt);/游戏杆在当前系统中的位置坐标范围从0 65535。位置表示范围从0-31if (!m_Absolute)x = LOWORD(lParam)/2048;y = HIWORD(lParam)/2048;/如果游戏杆在中心位置的左边,移动光标到左边。反之亦

7、然if(x = 20)pt.x = pt.x + x - 15;/如果游戏杆在中心位置的下边,移动光标到下边。反之亦然if(y = 20)pt.y = pt.y + y - 15;elseCDC* pDC = GetDC();x=LOWORD(lParam);y=HIWORD(lParam);pt.x=(pDC-GetDeviceCaps(HORZRES)*x)/65536;pt.y=(pDC-GetDeviceCaps(VERTRES)*y)/65536;ReleaseDC(pDC);/* Set the new cursor position.*/SetCursorPos(pt.x, pt

8、.y);break;return CDialog:WindowProc(message, wParam, lParam);在WindowProc过程中用MM_JOY1BUTTONDOWN, MM_JOY1BUTTONUP , MM_JOY1MOVE传递游戏杆设备消息。WindoweProc的参数wParam保存游戏杆按钮状态信息，参数iParam 的高十六位保存y坐标（0 65 535），低十六位保存x坐标（0 65 535）。位置（0，0）表示游戏杆位置的左上角，位置（65 535，65 535）表示游戏杆位置的右下角。用完游戏杆后要求确保释放。用joyReleaseCapture函数来实现

9、。下面为该函数的定义：MMRESULT joyReleaseCapture（UNIT uJoyID）；其中uJoyID是JOYSTICKID1与JOYSTICKID2中的一个。以下程序清单展示了在应用程序的DestroyWindow事件里游戏杆是如何释放的。void CJaystickDlg:OnDestroy() CDialog:OnDestroy();joyReleaseCapture(JOYSTICKID1); 三 应用程序实例 结合本文介绍的方法，编写了一个简单的应用程序。此应用程序创建了一个简单的对话窗口。启动该应用程序后，无论何时在游戏杆上按动一个按钮，按钮按下就会出现在按钮文本的

10、旁边。当移动游戏杆时，鼠标的光标就会在屏幕上移动，当你释放游戏杆时，鼠标的光标在当前位置保持不变。图1在Visual C+5.0环境下,用AppWizard生成对话框程序框架。对话框如图1所示。我们只需编辑JoystDlg.cpp，就可以实现该程序。下面给出JoystDlg.cpp的全部源代码。/ jaystdlg.cpp : implementation file#include stdafx.h#include joystick.h#include joystdlg.h#include mmsystem.h #ifdef _DEBUG#undef THIS_FILEstatic char

11、BASED_CODE THIS_FILE = _FILE_;#endif/ CAboutDlg dialog used for App About? ? ? / CJaystickDlg dialogCJaystickDlg:CJaystickDlg(CWnd* pParent /*=NULL*/): CDialog(CJaystickDlg:IDD, pParent)/AFX_DATA_INIT(CJaystickDlg)m_Absolute = FALSE;/AFX_DATA_INIT/ Note that LoadIcon does not require a subsequent De

12、stroyIcon in Win32m_hIcon = AfxGetApp()-LoadIcon(IDR_MAINFRAME);void CJaystickDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);/AFX_DATA_MAP(CJaystickDlg)DDX_Check(pDX, IDC_ABSOLUTE, m_Absolute);/AFX_DATA_MAPBEGIN_MESSAGE_MAP(CJaystickDlg, CDialog)/AFX_MSG_MAP(CJaystickDlg)ON_WM_SYS

13、COMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_WM_CREATE()ON_WM_DESTROY()/AFX_MSG_MAPEND_MESSAGE_MAP()/ CJaystickDlg message handlersBOOL CJaystickDlg:OnInitDialog()CDialog:OnInitDialog();CenterWindow();/ TODO: Add extra initialization herereturn TRUE; / return TRUE unless you set the focus to a cont

14、rolvoid CJaystickDlg:OnPaint() if (IsIconic()CPaintDC dc(this); / device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);/ Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);

15、int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;/ Draw the icondc.DrawIcon(x, y, m_hIcon);elseCDialog:OnPaint();/ The system calls this to obtain the cursor to display while the user drags/ the minimized window.HCURSOR CJaystickDlg:OnQueryDragIcon()return (HCURSOR) m

16、_hIcon;LRESULT CJaystickDlg:WindowProc(UINT message, WPARAM wParam, LPARAM lParam) switch(message)case MM_JOY1BUTTONDOWN :if (wParam & JOY_BUTTON1)MessageBeep(MB_ICONQUESTION);SetDlgItemText(IDC_BUTTON1,Button 1: );if (wParam & JOY_BUTTON2)MessageBeep(MB_ICONEXCLAMATION);SetDlgItemText(IDC_BUTTON2,B

17、utton 2: );break;case MM_JOY1BUTTONUP :if (wParam & JOY_BUTTON1)SetDlgItemText(IDC_BUTTON1,Button 1: );SetDlgItemText(IDC_BUTTON2,Button 2:);else if (wParam & JOY_BUTTON2)SetDlgItemText(IDC_BUTTON2,Button 2: );SetDlgItemText(IDC_BUTTON1,Button 1:);elseSetDlgItemText(IDC_BUTTON1,Button 1:);SetDlgItem

18、Text(IDC_BUTTON2,Button 2:);break;case MM_JOY1MOVE :WORD x, y;POINT pt;UpdateData(TRUE);/获取当前屏幕光标位置GetCursorPos(&pt);/游戏杆在当前系统中的位置坐标范围从0 65535。位置表示范围从0-31if (!m_Absolute)x = LOWORD(lParam)/2048;y = HIWORD(lParam)/2048;/如果游戏杆在中心位置的左边,移动光标到左边。反之亦然if(x = 20)pt.x = pt.x + x - 15;/如果游戏杆在中心位置的下边,移动光标到下边。反

19、之亦然if(y = 20)pt.y = pt.y + y - 15;elseCDC* pDC = GetDC();x=LOWORD(lParam);y=HIWORD(lParam);pt.x=(pDC-GetDeviceCaps(HORZRES)*x)/65536;pt.y=(pDC-GetDeviceCaps(VERTRES)*y)/65536;ReleaseDC(pDC);/* Set the new cursor position.*/SetCursorPos(pt.x, pt.y);break;return CDialog:WindowProc(message, wParam, lPa

20、ram);return CDialog:WindowProc(message, wParam, lParam);/ Capture the Joystick - JKint CJaystickDlg:OnCreate(LPCREATESTRUCT lpCreateStruct) int result;if (CDialog:OnCreate(lpCreateStruct) = -1)return -1;result=joySetCapture(CDialog:m_hWnd, JOYSTICKID1, 0, FALSE);if(result=JOYERR_NOCANDO)MessageBeep(

21、MB_ICONEXCLAMATION);MessageBox(不能捕获游戏杆, NULL, MB_OK | MB_ICONEXCLAMATION);return -1;if(result=JOYERR_UNPLUGGED)MessageBeep(MB_ICONEXCLAMATION);MessageBox(游戏杆未与系统连接, NULL, MB_OK | MB_ICONEXCLAMATION);return -1;return 0;void CJaystickDlg:OnDestroy() CDialog:OnDestroy();joyReleaseCapture(JOYSTICKID1);