使用 C++ 从 WMI 获取 Windows USB 标题字段

Question

我想遍历 Win32_USBControllerDevice 输出 USB 设备字幕。

我找到的示例使用 C#、Powershell 或 Python。

这是我的代码片段：

bool can_continue = true;
HRESULT result;
//...
        IEnumWbemClassObject* pEnumerator = NULL;
        if (can_continue)
        {
            result = pSvc->ExecQuery(L"WQL", 
                                     L"Select * From Win32_USBControllerDevice",
                                     WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
                                     NULL,
                                     &pEnumerator);
            if (result != S_OK)
            {
                status = TF_DEVICE_COM_USB_QUERY_FAILED;
                error_text = "Query for Win32_USBControllerDevice failed";
                can_continue = false;
            }
        }
        if (can_continue)
        {
            //  Iterate through the USB devices, looking for the LeCroy o'scope.
            IWbemClassObject *pclsObj = NULL;
            ULONG uReturn = 0;

            std::ostringstream name_stream;
            while (pEnumerator)
            {
                result = pEnumerator->Next(WBEM_INFINITE, 1, 
                                           &pclsObj, &uReturn);

                if(0 == uReturn)
                {
                    break;
                }

                VARIANT vtProp;
                result = pclsObj->Get(L"Dependent", 0, &vtProp, 0, 0);
                const _bstr_t device_name = vtProp.bstrVal;
                OutputDebugStringA("USB Device found: ");
                OutputDebugStringA(device_name);
                OutputDebugStringA("\r\n");
                VariantClear(&vtProp);

                pclsObj->Release();
            }

        }

Win32_USBControllerDevice class 具有以下字段：

class Win32_USBControllerDevice : CIM_ControlledBy
{
  uint32                NegotiatedDataWidth;
  uint64                NegotiatedSpeed;
  uint16                AccessState;
  uint32                NumberOfHardResets;
  uint32                NumberOfSoftResets;
  CIM_USBController REF Antecedent;
  CIM_LogicalDevice REF Dependent;
};

CIM_LogicalDevice 具有以下字段：

class CIM_LogicalDevice : CIM_LogicalElement
{
  string   Caption;
  string   Description;
  datetime InstallDate;
  string   Name;
  string   Status;
  uint16   Availability;
  uint32   ConfigManagerErrorCode;
  boolean  ConfigManagerUserConfig;
  string   CreationClassName;
  string   DeviceID;
  uint16   PowerManagementCapabilities[];
  boolean  ErrorCleared;
  string   ErrorDescription;
  uint32   LastErrorCode;
  string   PNPDeviceID;
  boolean  PowerManagementSupported;
  uint16   StatusInfo;
  string   SystemCreationClassName;
  string   SystemName;
};

上述片段输出中的设备（已删除计算机名称）：

USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&370B413&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB20\4&31D14255&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_058F&PID_6364\058F63646476"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_058F&PID_6364&MI_00\6&82F8931&0&0000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USBSTOR\DISK&VEN_GENERIC-&PROD_SD/MMC&REV_1.00\7&1C4905A4&0&058F63646476&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USBSTOR\DISK&VEN_GENERIC-&PROD_COMPACT_FLASH&REV_1.01\7&1C4905A4&0&058F63646476&1"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USBSTOR\DISK&VEN_GENERIC-&PROD_SM/XD-PICTURE&REV_1.02\7&1C4905A4&0&058F63646476&2"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USBSTOR\DISK&VEN_GENERIC-&PROD_MS/MS-PRO&REV_1.03\7&1C4905A4&0&058F63646476&3"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_058F&PID_6364&MI_01\6&82F8931&0&0001"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="HID\VID_058F&PID_6364&MI_01\7&918E966&0&0000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_272C&PID_7D13\5&2080E735&0&6"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_04B4&PID_00F1\01.00.001__USB:2.0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB20\4&2AB741E&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&270802C8&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&10B856B0&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&7274EB2&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&276DDCD3&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_046D&PID_C063\5&3A297DC0&0&1"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="HID\VID_046D&PID_C063\6&179AEF98&0&0000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_413C&PID_2105\5&3A297DC0&0&2"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="HID\VID_413C&PID_2105\6&F6A3C73&0&0000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\ROOT_HUB\4&299C35A7&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="USB\VID_0A5C&PID_21E8\00190E19540F"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTH\MS_RFCOMM\6&36F407EC&1&0"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTH\MS_BTHBRB\6&36F407EC&1&1"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001105-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001108-0000-1000-8000-00805F9B34FB}_LOCALMFG&000F\7&1DE6EB2&0&D08A55436A2B_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000110A-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000110B-0000-1000-8000-00805F9B34FB}_LOCALMFG&000F\7&1DE6EB2&0&D08A55436A2B_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000110C-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000110C-0000-1000-8000-00805F9B34FB}_LOCALMFG&000F\7&1DE6EB2&0&D08A55436A2B_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000110E-0000-1000-8000-00805F9B34FB}_LOCALMFG&000F\7&1DE6EB2&0&D08A55436A2B_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001112-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001115-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000111E-0000-1000-8000-00805F9B34FB}_LOCALMFG&000F\7&1DE6EB2&0&D08A55436A2B_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{0000111F-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001132-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001800-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{00001801-0000-1000-8000-00805F9B34FB}_VID&00010075_PID&0100\7&1DE6EB2&0&9C2A83FAE93F_C00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{24DF01A9-3E4F-4C9F-9F66-5AA8AB14F8F4}_LOCALMFG&0000\7&1DE6EB2&0&000000000000_00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{6E0C8F4C-D928-4852-B6B2-F0F0E0D126FA}_LOCALMFG&0000\7&1DE6EB2&0&000000000000_00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTHENUM\{84A1E9B8-12BA-4A9C-8AB0-A43784E0D149}_LOCALMFG&0000\7&1DE6EB2&0&000000000000_00000000"
USB Device found: \root\cimv2:Win32_PnPEntity.DeviceID="BTH\MS_BTHPAN\6&36F407EC&1&2"

与我的 Python 脚本输出不匹配：

USB Root Hub
USB Root Hub
USB Composite Device
USB Mass Storage Device
Generic- SD/MMC USB Device
Generic- Compact Flash USB Device
Generic- SM/xD-Picture USB Device
Generic- MS/MS-Pro USB Device
USB Input Device
HID-compliant device
IAR Systems I-jet Probe
Cypress USB StreamerExample
USB Root Hub
USB Root Hub
USB Root Hub
USB Root Hub
USB Root Hub
USB Input Device
HID-compliant mouse
USB Input Device
HID Keyboard Device
USB Root Hub
Broadcom BCM20702 Bluetooth 4.0 USB Device
Bluetooth Device (RFCOMM Protocol TDI) #3
Microsoft Bluetooth Enumerator
Bluetooth OPP
Bluetooth Headset
Bluetooth AV Source
Bluetooth AV
Bluetooth AV Remote Control Target
Bluetooth AV Remote Control Target
Bluetooth Remote Control
Bluetooth Headset AG
Bluetooth Personal Area Network User (PANU)
Bluetooth Hands-free
Bluetooth Hands-free AG
Bluetooth Message Access
GAP Protocol
GATT Protocol
Bluetooth Hands-free Audio
Bluetooth L2CAP Interface
Bluetooth Remote Control
Bluetooth Device (Personal Area Network) #3

问题：
1) 如何使用 C++ 获取 "Caption" 字段？
（Python 脚本正在打印 "caption" 字段。）

2) 哪些 MSDN 参考用于确定如何访问 "caption" 字段？

环境：
Windows7
Visual Studio 2010
使用 MFC 的 C++ GUI 项目

Answer 1

"Win32_USBControllerDevice" 的 Dependent 字段是参考。
解决方案是从查询中提取设备 ID，并使用它来查询 Win32_PnPEntity table。

此外，请注意从 _bstr_t 类型到 std::string 的转换可能会在 std::string 的末尾附加 '[=14=]'（std::string 不会需要终止 nul 字符）。

这是附加代码：

    IWbemClassObject *pclsObj = NULL;
    ULONG uReturn = 0;

    std::ostringstream name_stream;
    while (pEnumerator)
    {
        result = pEnumerator->Next(WBEM_INFINITE, 1, 
                                   &pclsObj, &uReturn);

        if(0 == uReturn)
        {
            break;
        }

        VARIANT vtProp;
        CIMTYPE pType;
        result = pclsObj->Get(L"Dependent", 0, &vtProp, &pType, 0);
        _bstr_t device_name_bstr = vtProp.bstrVal;
        std::string device_id = Convert_Bstr_to_string(device_name_bstr);

        // Create the Device ID string for the PnPEntity search.
        std::string::size_type  str_iter = device_id.find('"');
        while (str_iter != std::string::npos)
        {
            device_id.erase(str_iter, 1);
            str_iter = device_id.find('"');
        }
        str_iter = device_id.find('=');
        device_id.erase(0, str_iter + 1);

        //  Query the Win32_PnPEntity database for the device ID.
        std::string query = "Select * From Win32_PnPEntity Where DeviceID=\'";
        query += device_id;
        query += "\'";
        IEnumWbemClassObject* p_device_enumerator = NULL;
        _bstr_t     query_bstr(query.c_str());
        result = pSvc->ExecQuery(L"WQL", 
                                 query_bstr,
                                 WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
                                 NULL,
                                 &p_device_enumerator);
        IWbemClassObject *p_device_obj = NULL;
        uReturn = 0;
        while (p_device_enumerator)
        {
            result = p_device_enumerator->Next(WBEM_INFINITE, 1, 
                                               &p_device_obj, &uReturn);

            if(0 == uReturn)
            {
                break;
            }

            VARIANT vtProp;
            CIMTYPE pType;
            result = p_device_obj->Get(L"Caption", 0, &vtProp, &pType, 0);
            _bstr_t usb_device_name_bstr = vtProp.bstrVal;
            const std::string   usb_device_name = Convert_Bstr_to_string(usb_device_name_bstr);
            OutputDebugStringA("USB Device found: ");
            OutputDebugStringA(usb_device_name.c_str());
            OutputDebugStringA("\r\n");
            VariantClear(&vtProp);
            p_device_obj->Release();
        }

        VariantClear(&vtProp);

        pclsObj->Release();
    }

使用 C++ 从 WMI 获取 Windows USB 标题字段

Getting Windows USB caption field from WMI, using C++

c++

usb

wmi

visual-studio-2010

windows-7