Windows SetupAPI DIF_REMOVE usage - c++

Question

I'm trying to entirely disable the keyboard using the windows SetupAPI.
At present I can remove the keyboard successfully with no issues using the DIF_REMOVE function like so:
#include <windows.h>
#include <SetupAPI.h>
#include <iostream>
#include <string>
const std::string keyboard_device_instance_path("<my_path_here>"); // Win7
HDEVINFO DeviceInfoSet = ::SetupDiGetClassDevs(nullptr, nullptr, nullptr, DIGCF_ALLCLASSES | DIGCF_ALLCLASSES);
SP_DEVINFO_DATA DeviceInfoData;
::ZeroMemory(&DeviceInfoData, sizeof(SP_DEVINFO_DATA));
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
DWORD DeviceIndex = 0;
std::vector<char> DeviceInstanceId(128, '\0');
DWORD RequiredSize = 0;
// Query all devices
while (::SetupDiEnumDeviceInfo(DeviceInfoSet, DeviceIndex++, &DeviceInfoData))
{
// Find the Keyboard
if (::SetupDiGetDeviceInstanceIdA(DeviceInfoSet, &DeviceInfoData, &DeviceInstanceId[0], DWORD(DeviceInstanceId.size()), &RequiredSize))
{
if (keyboard_device_instance_path == &DeviceInstanceId[0])
{
std::cout << "Breaking keyboard\n";
if (!SetupDiCallClassInstaller(DIF_REMOVE, DeviceInfoSet, &DeviceInfoData))
{
std::cerr << "Failed to remove keyboard: " << ::GetLastError() << '.' << std::endl;
}
}
After disabling it, I want to re-enable the keyboard when a condition is met. For this I naturally looked to 'DIF_UNREMOVE' but have had no success.
Here is the code that attempts to re-enable the keyboard:
SP_UNREMOVEDEVICE_PARAMS UnRemoveParams;
UnRemoveParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
UnRemoveParams.ClassInstallHeader.InstallFunction = DIF_UNREMOVE;
UnRemoveParams.Scope = DI_UNREMOVEDEVICE_CONFIGSPECIFIC;
UnRemoveParams.HwProfile = 0;
if (::SetupDiSetClassInstallParams(DeviceInfoSet, &DeviceInfoData, &UnRemoveParams.ClassInstallHeader, sizeof(UnRemoveParams)))
{
std::cout << "Fixing keyboard\n";
if (!SetupDiCallClassInstaller(DIF_UNREMOVE, DeviceInfoSet, &DeviceInfoData))
{
std::cerr << "Failed to re-enable keyboard: " << ::GetLastError() << std::endl;
}
}
This code is used in the while loop immediately after the removal code. I get an error "No such device installed". What is the correct way to do this? I can only use headers supported by windowsXP

Answer 1

I eventually solved this by instead re-enumerating the systems hardware devices like so:
DWORD pdnDevInst = 0;
if (CM_Locate_DevNodeA(PDEVINST(&pdnDevInst), NULL, CM_LOCATE_DEVNODE_NORMAL) != CR_SUCCESS)
{
std::cout << "Failed to revive keyboard\n";
}
else if (CM_Reenumerate_DevNode(pdnDevInst, CM_REENUMERATE_NORMAL) != CR_SUCCESS)
{
std::cout << "Failed to revive keyboard: Renumerate dev node Error\n";
}