public static BatteryInformation GetBatteryInformation()
{
var deviceDataPointer = IntPtr.Zero;
var queryInfoPointer = IntPtr.Zero;
var batteryInfoPointer = IntPtr.Zero;
var batteryWaitStatusPointer = IntPtr.Zero;
var batteryStatusPointer = IntPtr.Zero;
try
{
var deviceHandle = SetupDiGetClassDevs(Win32.GUID_DEVCLASS_BATTERY, Win32.DEVICE_GET_CLASS_FLAGS.DIGCF_PRESENT | Win32.DEVICE_GET_CLASS_FLAGS.DIGCF_DEVICEINTERFACE);
var deviceInterfaceData = new Win32.SP_DEVICE_INTERFACE_DATA();
deviceInterfaceData.CbSize = Marshal.SizeOf(deviceInterfaceData);
SetupDiEnumDeviceInterfaces(deviceHandle, Win32.GUID_DEVCLASS_BATTERY, 0, ref deviceInterfaceData);
deviceDataPointer = Marshal.AllocHGlobal(Win32.DEVICE_INTERFACE_BUFFER_SIZE);
var deviceDetailData = new Win32.SP_DEVICE_INTERFACE_DETAIL_DATA {
CbSize = (IntPtr.Size == 8) ? 8 : 4 + Marshal.SystemDefaultCharSize
};
SetupDiGetDeviceInterfaceDetail(deviceHandle, ref deviceInterfaceData, ref deviceDetailData, Win32.DEVICE_INTERFACE_BUFFER_SIZE);
var batteryHandle = CreateFile(deviceDetailData.DevicePath, FileAccess.ReadWrite, FileShare.ReadWrite, FileMode.Open, Win32.FILE_ATTRIBUTES.Normal);
var queryInformation = new Win32.BATTERY_QUERY_INFORMATION();
DeviceIoControl(batteryHandle, Win32.IOCTL_BATTERY_QUERY_TAG, ref queryInformation.BatteryTag);
var batteryInformation = new Win32.BATTERY_INFORMATION();
queryInformation.InformationLevel = Win32.BATTERY_QUERY_INFORMATION_LEVEL.BatteryInformation;
var queryInfoSize = Marshal.SizeOf(queryInformation);
var batteryInfoSize = Marshal.SizeOf(batteryInformation);
queryInfoPointer = Marshal.AllocHGlobal(queryInfoSize);
Marshal.StructureToPtr(queryInformation, queryInfoPointer, false);
batteryInfoPointer = Marshal.AllocHGlobal(batteryInfoSize);
Marshal.StructureToPtr(batteryInformation, batteryInfoPointer, false);
DeviceIoControl(batteryHandle, Win32.IOCTL_BATTERY_QUERY_INFORMATION, queryInfoPointer, queryInfoSize, batteryInfoPointer, batteryInfoSize);
var updatedBatteryInformation = (Win32.BATTERY_INFORMATION)Marshal.PtrToStructure(batteryInfoPointer, typeof(Win32.BATTERY_INFORMATION));
var batteryWaitStatus = new Win32.BATTERY_WAIT_STATUS {
BatteryTag = queryInformation.BatteryTag
};
var batteryStatus = new Win32.BATTERY_STATUS();
var waitStatusSize = Marshal.SizeOf(batteryWaitStatus);
var batteryStatusSize = Marshal.SizeOf(batteryStatus);
batteryWaitStatusPointer = Marshal.AllocHGlobal(waitStatusSize);
Marshal.StructureToPtr(batteryWaitStatus, batteryWaitStatusPointer, false);
batteryStatusPointer = Marshal.AllocHGlobal(batteryStatusSize);
Marshal.StructureToPtr(batteryStatus, batteryStatusPointer, false);
DeviceIoControl(batteryHandle, Win32.IOCTL_BATTERY_QUERY_STATUS, batteryWaitStatusPointer, waitStatusSize, batteryStatusPointer, batteryStatusSize);
var updatedStatus = (Win32.BATTERY_STATUS)Marshal.PtrToStructure(batteryStatusPointer, typeof(Win32.BATTERY_STATUS));
Win32.SetupDiDestroyDeviceInfoList(deviceHandle);
return(new BatteryInformation()
{
DesignedMaxCapacity = updatedBatteryInformation.DesignedCapacity,
FullChargeCapacity = updatedBatteryInformation.FullChargedCapacity,
CurrentCapacity = updatedStatus.Capacity,
Voltage = updatedStatus.Voltage,
DischargeRate = updatedStatus.Rate
});
}
finally
{
Marshal.FreeHGlobal(deviceDataPointer);
Marshal.FreeHGlobal(queryInfoPointer);
Marshal.FreeHGlobal(batteryInfoPointer);
Marshal.FreeHGlobal(batteryStatusPointer);
Marshal.FreeHGlobal(batteryWaitStatusPointer);
}
}
private static bool SetupDiGetDeviceInterfaceDetail(IntPtr deviceInfoSet, ref Win32.SP_DEVICE_INTERFACE_DATA deviceInterfaceData, ref Win32.SP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData, int deviceInterfaceDetailSize)
{
var retval = Win32.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, ref deviceInterfaceDetailData, (uint)deviceInterfaceDetailSize, out uint reqSize, IntPtr.Zero);
retval = Win32.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, ref deviceInterfaceDetailData, (uint)reqSize, out reqSize, IntPtr.Zero);
if (!retval)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode != 0)
{
throw Marshal.GetExceptionForHR(errorCode);
}
else
{
throw new Exception("SetupDiGetDeviceInterfaceDetail call failed but Win32 didn't catch an error.");
}
}
return(retval);
}
