public static BatteryInformation GetBatteryInformation()
{
IntPtr deviceDataPointer = IntPtr.Zero;
IntPtr queryInfoPointer = IntPtr.Zero;
IntPtr batteryInfoPointer = IntPtr.Zero;
IntPtr batteryWaitStatusPointer = IntPtr.Zero;
IntPtr batteryStatusPointer = IntPtr.Zero;
try
{
IntPtr deviceHandle = SetupDiGetClassDevs(
Win32.GUID_DEVCLASS_BATTERY, Win32.DEVICE_GET_CLASS_FLAGS.DIGCF_PRESENT | Win32.DEVICE_GET_CLASS_FLAGS.DIGCF_DEVICEINTERFACE);
Win32.SP_DEVICE_INTERFACE_DATA 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);
//Win32.SP_DEVICE_INTERFACE_DETAIL_DATA deviceDetailData =
// (Win32.SP_DEVICE_INTERFACE_DETAIL_DATA)Marshal.PtrToStructure(deviceDataPointer, typeof(Win32.SP_DEVICE_INTERFACE_DETAIL_DATA));
//toggle these two and see if naything changes... ^^^^^^^^^^^^
Win32.SP_DEVICE_INTERFACE_DETAIL_DATA deviceDetailData = new Win32.SP_DEVICE_INTERFACE_DETAIL_DATA();
deviceDetailData.CbSize = (IntPtr.Size == 8) ? 8 : 4 + Marshal.SystemDefaultCharSize;
SetupDiGetDeviceInterfaceDetail(deviceHandle, ref deviceInterfaceData, ref deviceDetailData, Win32.DEVICE_INTERFACE_BUFFER_SIZE);
IntPtr batteryHandle = CreateFile(deviceDetailData.DevicePath, FileAccess.ReadWrite, FileShare.ReadWrite, FileMode.Open, Win32.FILE_ATTRIBUTES.Normal);
Win32.BATTERY_QUERY_INFORMATION queryInformation = new Win32.BATTERY_QUERY_INFORMATION();
DeviceIoControl(batteryHandle, Win32.IOCTL_BATTERY_QUERY_TAG, ref queryInformation.BatteryTag);
Win32.BATTERY_INFORMATION batteryInformation = new Win32.BATTERY_INFORMATION();
queryInformation.InformationLevel = Win32.BATTERY_QUERY_INFORMATION_LEVEL.BatteryInformation;
int queryInfoSize = Marshal.SizeOf(queryInformation);
int 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);
Win32.BATTERY_INFORMATION updatedBatteryInformation =
(Win32.BATTERY_INFORMATION)Marshal.PtrToStructure(batteryInfoPointer, typeof(Win32.BATTERY_INFORMATION));
Win32.BATTERY_WAIT_STATUS batteryWaitStatus = new Win32.BATTERY_WAIT_STATUS();
batteryWaitStatus.BatteryTag = queryInformation.BatteryTag;
Win32.BATTERY_STATUS batteryStatus = new Win32.BATTERY_STATUS();
int waitStatusSize = Marshal.SizeOf(batteryWaitStatus);
int 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);
Win32.BATTERY_STATUS 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)
{
//int tmpSize = Marshal.SizeOf(deviceInterfaceDetailData);
uint reqSize;
bool retval = Win32.SetupDiGetDeviceInterfaceDetail(
deviceInfoSet, ref deviceInterfaceData, ref deviceInterfaceDetailData, (uint)deviceInterfaceDetailSize, 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);
}
