windows - 如何枚举所有连接的 USB 设备的设备路径?

问题描述

我正在尝试使用 SetupDi 函数来枚举所有连接的 USB 设备的设备路径.设备路径是在 CreateFile() 中使用的路径，因此我可以与设备进行通信.

I'm trying to use the SetupDi functions to enumerate all connected USB devices' device path. The device path is the path used in CreateFile() so I can communicate with the device.

但是，SetupDiGetDeviceInterface 需要一个接口 GUID，但我并没有专门寻找特定的接口(除了所有连接的 USB).这部分已被注释为/* ???*/在下面的源代码中.

However, SetupDiGetDeviceInterface requires an interface GUID but I'm not specifically looking for a particular interface (other than all connected USBs). This part has been commented as /* ??? */ in the source below.

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};但这引发了不再有接口"的错误.

I've tried to supply GUID_DEVCLASS_UNKNOWN = {0x4d36e97e, 0xe325, 0x11ce, {0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}; but this threw a "no more interfaces" error.

我也尝试将 deviceInfoData.ClassGuid 提供到 SetupDiGetDeviceInterface 中，但我得到与上述相同的错误，没有更多接口".

I've also tried to supply deviceInfoData.ClassGuid into SetupDiGetDeviceInterface but I get the same error as above, "no more interfaces".

问题:

是否有涵盖所有 USB 设备的通用接口类?(HID、通用等)

Is there a general interface class which will cover all USB devices? (HID, generic, etc.)

或者是否有替代功能可以为我提供设备的路径?(插入由 SetupDiGetDeviceInterfaceDetail 返回的 SP_DEVICE_INTERFACE_DETAIL_DATA 结构).

Or is there an alternate function which will give me the path to the device? (Instread of the SP_DEVICE_INTERFACE_DETAIL_DATA structure returned by SetupDiGetDeviceInterfaceDetail).

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
}

推荐答案

MSDN 说有一个名为 GUID_DEVINTERFACE_USB_DEVICE 的通用 USB 设备接口类，其 GUID {A5DCBF10-6530-11D2-901F-00C04FB951ED}:

MSDN says that there's a generic USB device interface class named GUID_DEVINTERFACE_USB_DEVICE with the GUID {A5DCBF10-6530-11D2-901F-00C04FB951ED}:

系统提供的 USB 集线器驱动程序注册 GUID_DEVINTERFACE_USB_DEVICE 的实例，以通知系统和应用程序存在连接到 USB 集线器的 USB 设备.

这是一个代码示例，似乎可以做您想做的事，使用 DEVINTERFACE_USB_DEVICE GUID.

Here's a code example that seems to do what you want to do, using the DEVINTERFACE_USB_DEVICE GUID.

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