m_strLog.Empty();

m_strLog = _T("正在查找系统中HID类的GUID标识...\r\n");
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\r\n");

CString strShow;
strShow.Format("%08x-%04x-%04x-%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x\r\n",
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...\r\n");
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\r\n",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...\r\n");
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\r\n");
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);