How to open a handle to a device using its Device Instance ID?

To open a handle to a device using its Device Instance ID in Windows, you can use the CreateFile function from the Windows API. The Device Instance ID uniquely identifies a device on a system.

Here's an example in C++ that demonstrates how to open a handle to a device using its Device Instance ID:

cppCopy code
#include <Windows.h>

#include <SetupAPI.h>

#include <iostream>



int main()

{

    const wchar_t* deviceInstanceID = L"your_device_instance_id_here";



    // Get the device information set based on the device class (e.g., for USB devices)

    HDEVINFO deviceInfoSet = SetupDiGetClassDevsW(nullptr, L"USB", nullptr, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);

    if (deviceInfoSet == INVALID_HANDLE_VALUE)

    {

        std::cerr << "Failed to get device information set. Error code: " << GetLastError() << std::endl;

        return 1;

    }



    // Find the device interface data that matches the Device Instance ID

    SP_DEVICE_INTERFACE_DATA deviceInterfaceData = { sizeof(SP_DEVICE_INTERFACE_DATA) };

    if (!SetupDiOpenDeviceInfoW(deviceInfoSet, deviceInstanceID, nullptr, 0, nullptr))

    {

        std::cerr << "Failed to open device info. Error code: " << GetLastError() << std::endl;

        SetupDiDestroyDeviceInfoList(deviceInfoSet);

        return 1;

    }



    // Get the device path for the device interface

    wchar_t devicePath[MAX_PATH];

    if (!SetupDiGetDeviceInterfaceDetailW(deviceInfoSet, &deviceInterfaceData, nullptr, 0, nullptr, nullptr))

    {

        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)

        {

            std::cerr << "Failed to get device interface detail. Error code: " << GetLastError() << std::endl;

            SetupDiDestroyDeviceInfoList(deviceInfoSet);

            return 1;

        }

    }



    PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = reinterpret_cast<PSP_DEVICE_INTERFACE_DETAIL_DATA>(new BYTE[sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) + MAX_PATH]);

    deviceInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);



    if (!SetupDiGetDeviceInterfaceDetailW(deviceInfoSet, &deviceInterfaceData, deviceInterfaceDetailData, sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) + MAX_PATH, nullptr, nullptr))

    {

        std::cerr << "Failed to get device interface detail. Error code: " << GetLastError() << std::endl;

        SetupDiDestroyDeviceInfoList(deviceInfoSet);

        delete[] deviceInterfaceDetailData;

        return 1;

    }



    // Open a handle to the device

    HANDLE deviceHandle = CreateFileW(deviceInterfaceDetailData->DevicePath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, 0, nullptr);

    if (deviceHandle == INVALID_HANDLE_VALUE)

    {

        std::cerr << "Failed to open device. Error code: " << GetLastError() << std::endl;

        SetupDiDestroyDeviceInfoList(deviceInfoSet);

        delete[] deviceInterfaceDetailData;

        return 1;

    }



    // Device handle is now open and can be used to interact with the device



    // Cleanup

    CloseHandle(deviceHandle);

    SetupDiDestroyDeviceInfoList(deviceInfoSet);

    delete[] deviceInterfaceDetailData;



    return 0;

}

Replace "your_device_instance_id_here" with the actual Device Instance ID of the device you want to open.

This code retrieves the device information set for a specific device class (e.g., USB devices) and then uses the Device Instance ID to find the corresponding device interface data. Finally, it