Detect power change event / UPS state - c++

Question

I want to detect when the system is on UPS or just power state changes.
Something like this:
I tried to detect it using GetSystemPowerStatus function:
Code:
SYSTEM_POWER_STATUS powerStatus;
bool powerStatusRes = GetSystemPowerStatus(&powerStatus);
switch (powerStatus.ACLineStatus) {
case 0:
std::cout << "Offline" << std::endl;
break;
case 1:
std::cout << "Online" << std::endl;
break;
case 255:
std::cout << "Unknown status" << std::endl;
default:
std::cout << "Failed to detect the status" << std::endl;
}
switch (powerStatus.BatteryFlag) {
case 1:
std::cout << "High — the battery capacity is at more than 66 percent" << std::endl;
break;
case 2:
std::cout << "Low — the battery capacity is at less than 33 percent" << std::endl;
break;
case 4:
std::cout << "Critical — the battery capacity is at less than five percent" << std::endl;
break;
case 8:
std::cout << "Charging" << std::endl;
break;
case 128:
std::cout << "No system battery" << std::endl;
break;
case 255:
std::cout << "Unknown status—unable to read the battery flag information" << std::endl;
break;
default:
std::cout << "Failed to detect the battery flag" << std::endl;
}
But it returns powerStatus.ACLineStatus for UPS or AC as Online and for powerStatus.BatteryFlag - No system battery.
Also I have tried to detect the UPS using GetPwrCapabilities function:
Code:
SYSTEM_POWER_CAPABILITIES SysPowerCapabilities = {0};
if (!GetPwrCapabilities(&SysPowerCapabilities)){
std::cout << "Failed to get System Power information!" << std::endl;
}
if (SysPowerCapabilities.UpsPresent) {
std::cout << "UPS found" << std::endl;
} else {
std::cout << "UPS not found" << std::endl;
}
It returns - UPS not found (driver is not available for this UPS model).
Now I'm trying to detect power changes by using the Qt nativeEvent function:
bool Test::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
Q_UNUSED(result);
Q_UNUSED(eventType);
MSG *msg = static_cast<MSG*>(message);
if (msg->message == WM_POWERBROADCAST && msg->wParam == PBT_APMPOWERSTATUSCHANGE) {
qDebug() << "Power changed!!!";
}
return false;
}
But nothing is printed to the console. Any ideas how to detect it? Thanks.
Updated: 03.02.2019
I have found that I need to use the HID API to get some values for the UPS. Some of the values for UPS from the net.
0x00840010 = UPS
0x00840012 = Battery
0x00840030 = Voltage
0x00840040 = ConfigVoltage
0x0084001a = Input
0x0084005a = AudibleAlarmControl
0x00840002 = PresentStatus
0x00850044 = Charging
0x00850045 = Discharging
0x008500d0 = ACPresent
Updated code:
QString devicePath = "\\\\?\\HID#VID_....";
HANDLE fileHandle = CreateFileA(devicePath.toStdString().c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
if (fileHandle != INVALID_HANDLE_VALUE) {
std::cout << "Success. Device opened for reading..." << std::endl;
PHIDP_PREPARSED_DATA preparsedData;
HIDP_CAPS capabilities;
HIDD_ATTRIBUTES attributes;
BOOL hidPreparsedRes = HidD_GetPreparsedData(fileHandle, &preparsedData);
if (hidPreparsedRes) {
if (HidD_GetAttributes(fileHandle, &attributes)) {
std::cout << "Product ID: " << attributes.ProductID << std::endl;
std::cout << "Size: " << attributes.Size << std::endl;
std::cout << "Vendor ID: " << attributes.VendorID << std::endl;
std::cout << "Version number: " << attributes.VersionNumber << std::endl;
if (HidP_GetCaps(preparsedData, &capabilities) == HIDP_STATUS_SUCCESS) {
std::cout << "Caps: " << capabilities.NumberOutputValueCaps << std::endl;
} else {
std::cout << "Failed to return HID capabilities!" << std::endl;
}
} else {
std::cout << "Failed to get HID attributes" << std::endl;
}
std::cout << getLastErrorAsString() << std::endl;
} else {
std::cout << "Failed to get preparsed data!" << std::endl;
}
HidD_FreePreparsedData(preparsedData);
} else {
std::cout << "Failed to open device for reading!" << std::endl;
}
CloseHandle(fileHandle);
So now, it returns:
Success. Device opened for reading...
Product ID: 20833
Size: 12
Vendor ID: 1637
Version number: 2
Caps: 1
HIDP_CAPS structure has a lot of different values, the question is how to convert them to UPS values to check for power changes/UPS status? Thanks.