windows - 如何枚举所有连接的 USB 设备的设备路径？

Question

我正在尝试使用 SetupDi 函数枚举所有连接的 USB 设备的设备路径。设备路径是 CreateFile() 中使用的路径，因此我可以与设备通信。

然而，SetupDiGetDeviceInterface需要接口(interface) GUID，但我并不是专门寻找特定接口(interface)(除了所有连接的 USB)。这部分被注释为/* ??? */在下面的源代码中。

尝试的解决方案:

我尝试提供 GUID_DEVCLASS_UNKNOWN = {0x4d36e97e, 0xe325, 0x11ce, {0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}};但这引发了“没有更多接口(interface)”错误。

我也曾尝试将 deviceInfoData.ClassGuid 提供给 SetupDiGetDeviceInterface，但我遇到了与上述相同的错误，“没有更多接口(interface)”。

问题:

是否有一个涵盖所有 USB 设备的通用接口(interface)类？ (HID、通用等)

或者是否有替代函数可以为我提供设备路径？ (Instread 由 SetupDiGetDeviceInterfaceDetail 返回的 SP_DEVICE_INTERFACE_DETAIL_DATA 结构)。

来源:

HDEVINFO deviceInfoList
SP_DEVINFO_DATA deviceInfoData;
deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = NULL;
DWORD requiredLength = 0;
char *hardwareID = 0;

// Retrieve a list of all present devices
deviceInfoList = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE | DIGCF_ALLCLASSES);

if (deviceInfoList == INVALID_HANDLE_VALUE) {
    SetupDiDestroyDeviceInfoList(deviceInfoList);
    return false;
}

// Iterate over the list
for (DWORD i = 0; SetupDiEnumDeviceInfo(deviceInfoList, i, &deviceInfoData); i++) {
    if (deviceInterfaceDetailData) LocalFree(deviceInterfaceDetailData);

    requiredLength = 0;

    SetupDiGetDeviceRegistryProperty(deviceInfoList, &deviceInfoData, SPDRP_HARDWAREID, &DataT, NULL, 0, &requiredLength);

    if (requiredLength <= 0) {
        SetupDiDestroyDeviceInfoList(deviceInfoList);
        return false;
    }

    hardwareID = new char[requiredLength]();

    SetupDiGetDeviceRegistryProperty(deviceInfoList, &deviceInfoData, SPDRP_HARDWAREID, &DataT, (PBYTE)hardwareID, requiredLength, NULL);

    // Parse hardwareID for vendor ID and product ID

    delete hardwareID;
    hardwareID = 0;

    deviceInterfaceData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);

    // Requires an interface GUID, for which I have none to specify
    if (!SetupDiEnumDeviceInterfaces(deviceInfoList, &deviceInfoData, /* ??? */, 0, &deviceInterfaceData)) {
        SetupDiDestroyDeviceInfoList(deviceInfoList);
        return false;
    }

    if (!SetupDiGetDeviceInterfaceDetail(deviceInfoList, &deviceInterfaceData, NULL, 0, &requiredLength, NULL)) {
        if (GetLastError() == ERROR_INSUFFICIENT_BUFFER && requiredLength > 0) {
            deviceInterfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)LocalAlloc(LPTR, requiredLength);

            if (!deviceInterfaceDetailData) {
                SetupDiDestroyDeviceInfoList(deviceInfoList);
                return false;
            }
        } else {
            SetupDiDestroyDeviceInfoList(deviceInfoList);
            return false;
        }
    }

    deviceInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);

    if (!SetupDiGetDeviceInterfaceDetail(deviceInfoList, &deviceInterfaceData, deviceInterfaceDetailData, requiredLength, NULL, &deviceInfoData)) {
        SetupDiDestroyDeviceInfoList(deviceInfoList);
        return false;
    }

    SetupDiDestroyDeviceInfoList(deviceInfoList);

    // deviceInterfaceDetailData->DevicePath yields the device path
}

Answer 1

MSDN表示有一个名为 GUID_DEVINTERFACE_USB_DEVICE 的通用 USB 设备接口(interface)类，GUID {A5DCBF10-6530-11D2-901F-00C04FB951ED}:

The system-supplied USB hub driver registers instances of GUID_DEVINTERFACE_USB_DEVICE to notify the system and applications of the presence of USB devices that are attached to a USB hub.

Here's a code example使用 DEVINTERFACE_USB_DEVICE GUID，这似乎可以做您想做的事。