USB编程

开发平台：
Visual C++

USBPortDlg.cpp：源码内容
							// USBPortDlg.cpp : implementation file
//
#include "stdafx.h"
#include "USBPort.h"
#include "USBPortDlg.h"
#include "setupapi.h"
#include "hidsdi.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
	CAboutDlg();
// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL
// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CUSBPortDlg dialog
CUSBPortDlg::CUSBPortDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUSBPortDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUSBPortDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CUSBPortDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUSBPortDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CUSBPortDlg, CDialog)
	//{{AFX_MSG_MAP(CUSBPortDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_FIND, OnSearch)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CUSBPortDlg message handlers
BOOL CUSBPortDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	// Add "About..." menu item to system menu.
	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);
	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}
	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	GetDlgItem(IDC_FIND)->SetFocus();
	return FALSE;  // return TRUE  unless you set the focus to a control
}
void CUSBPortDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}
// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.
void CUSBPortDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;
		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}
// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CUSBPortDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
void CUSBPortDlg::OnSearch() 
{
	// TODO: Add your control notification handler code here
	m_strLog.Empty();
	m_strLog = _T("正在查找系统中HID类的GUID标识...rn");
	SetDlgItemText(IDC_EDIT_REPORT,m_strLog);
	// 查找本系统中HID类的GUID标识
	GUID guidHID;
	HidD_GetHidGuid(&guidHID);
	m_strLog += _T("HID类的GUID标识为rn");
	CString strShow;
	strShow.Format("%08x-%04x-%04x-%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02xrn",
		guidHID.Data1,guidHID.Data2,guidHID.Data3,guidHID.Data4[0],
		guidHID.Data4[1],guidHID.Data4[2],guidHID.Data4[3],guidHID.Data4[4],
		guidHID.Data4[5],guidHID.Data4[6],guidHID.Data4[7]);
	m_strLog += strShow;
	SetDlgItemText(IDC_EDIT_REPORT,m_strLog);
	// 准备查找符合HID规范的USB设备
	HDEVINFO hDevInfo = SetupDiGetClassDevs(&guidHID,NULL,0,
		DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
	
	UINT nIndex = 0;
	m_strLog += _T("正在查找可用的USB设备...rn");
	SetDlgItemText(IDC_EDIT_REPORT,m_strLog);
	// 查找USB设备接口
	SP_DEVICE_INTERFACE_DATA strtInterfaceData;
	BOOL bSuccess = SetupDiEnumDeviceInterfaces(hDevInfo,NULL,&guidHID,0,
		&strtInterfaceData);
	if (!bSuccess)
	{
		m_strLog += _T("抱歉，未找到可用的USB设备");
		SetupDiDestroyDeviceInfoList(hDevInfo);
		return;
	}
	// 若找到了设备，则读取设备路径名
	SP_DEVICE_INTERFACE_DETAIL_DATA strtDetailData;
	if (!SetupDiGetDeviceInterfaceDetail(hDevInfo,&strtInterfaceData,
		&strtDetailData,sizeof(strtDetailData),NULL,NULL))
	{
		AfxMessageBox(_T("查找设备路径时出错!"));
		SetupDiDestroyDeviceInfoList(hDevInfo);
		return;
	}
	// 找到了设备路径
	m_strPath = strtDetailData.DevicePath;
	strShow.Format("可以通过路径%s访问设备rn",m_strPath);
	m_strLog += strShow;
	SetDlgItemText(IDC_EDIT_REPORT,m_strLog);
	// 开放与设备的通信
	HANDLE hCom = CreateFile(m_strPath,GENERIC_READ | GENERIC_WRITE,
		0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	if (hCom = INVALID_HANDLE_VALUE)
	{
		AfxMessageBox(_T("无法打开通信端口"));
		SetupDiDestroyDeviceInfoList(hDevInfo);
		return;
	}
	// 查询设备标识
	HIDD_ATTRIBUTES strtAttrib;
	m_strPath += _T("正在读取设备的标识...rn");
	SetDlgItemText(IDC_EDIT_REPORT,m_strPath);
	if (!HidD_GetAttributes(hCom,&strtAttrib))
	{
		AfxMessageBox(_T("查询设备状态时出错!"));
		CloseHandle(hCom);
		SetupDiDestroyDeviceInfoList(hDevInfo);
	}
	// 将有关该设备的标识显示出来
	m_strPath += _T("已读取，见右边所示rn");
	SetDlgItemText(IDC_EDIT_REPORT,m_strPath);
	// 显示供应商标识
	strShow.Format("0x%x",strtAttrib.VendorID);
	SetDlgItemText(IDC_ID_VENDOR,strShow);
	// 显示产品标识
	strShow.Format("0x%x",strtAttrib.ProductID);
	SetDlgItemText(IDC_ID_PRODUCT,strShow);
	// 显示产品版本号
	strShow.Format("%d",strtAttrib.VersionNumber);
	SetDlgItemText(IDC_ID_VERSION,strShow);
	// 释放资源
	CloseHandle(hCom);
	SetupDiDestroyDeviceInfoList(hDevInfo);
}

						