private bool ReadFileManagedBuffer(
SafeFileHandle hFile,
byte[] INBuffer,
uint nNumberOfBytesToRead,
ref uint lpNumberOfBytesRead,
IntPtr lpOverlapped)
{
IntPtr num = IntPtr.Zero;
try
{
num = Marshal.AllocHGlobal((int)nNumberOfBytesToRead);
if (USBM.ReadFile(hFile, num, nNumberOfBytesToRead, ref lpNumberOfBytesRead, lpOverlapped))
{
Marshal.Copy(num, INBuffer, 0, (int)lpNumberOfBytesRead);
Marshal.FreeHGlobal(num);
return(true);
}
Marshal.FreeHGlobal(num);
return(false);
}
catch
{
if (num != IntPtr.Zero)
{
Marshal.FreeHGlobal(num);
}
return(false);
}
}
public bool OpenDevice()
{
if (this.CheckIfPresentAndGetUSBDevicePath())
{
this.WriteHandleToUSBDevice = USBM.CreateFile(this.DevicePath, 1073741824U, 3U, IntPtr.Zero, 3U, 0U, IntPtr.Zero);
uint lastWin32Error1 = (uint)Marshal.GetLastWin32Error();
this.ReadHandleToUSBDevice = USBM.CreateFile(this.DevicePath, 2147483648U, 3U, IntPtr.Zero, 3U, 0U, IntPtr.Zero);
uint lastWin32Error2 = (uint)Marshal.GetLastWin32Error();
if (lastWin32Error1 == 0U && lastWin32Error2 == 0U)
{
this.AttachedState = true;
}
else
{
this.AttachedState = false;
if (lastWin32Error1 == 0U)
{
this.WriteHandleToUSBDevice.Close();
}
if (lastWin32Error2 == 0U)
{
this.ReadHandleToUSBDevice.Close();
}
}
}
else
{
this.AttachedState = false;
}
this.InfoDevice = this.GetInfoForDevice();
return(this.AttachedState);
}
public float GetMeasuredValue()
{
byte[] lpBuffer = new byte[65];
byte[] INBuffer = new byte[65];
uint lpNumberOfBytesWritten = 0;
uint lpNumberOfBytesRead = 0;
try
{
if (this.AttachedState)
{
lpBuffer[0] = (byte)0;
lpBuffer[1] = (byte)55;
for (uint index = 2; index < 65U; ++index)
{
lpBuffer[index] = byte.MaxValue;
}
if (USBM.WriteFile(this.WriteHandleToUSBDevice, lpBuffer, 65U, ref lpNumberOfBytesWritten, IntPtr.Zero))
{
INBuffer[0] = (byte)0;
if (this.ReadFileManagedBuffer(this.ReadHandleToUSBDevice, INBuffer, 65U, ref lpNumberOfBytesRead, IntPtr.Zero))
{
if (INBuffer[1] == (byte)55)
{
if (this.InfoDevice.UnitVersion == 5)
{
if (this.InfoDevice.Subtype == 1)
{
this.ADC = ((int)INBuffer[2] << 16) + ((int)INBuffer[3] << 8) + (int)INBuffer[4];
if ((this.ADC & this.signbit) != 0)
{
this.ADC -= 16777216;
}
this.ADC = (int)((double)this.ADC * this.InfoDevice.CalibValue);
this.ADCValue = (float)this.ADC;
this.ADCValue /= 1000f;
this.ADCValue = (float)Math.Round((double)this.ADCValue, 3);
return(this.ADCValue);
}
}
}
}
}
}
}
catch
{
}
return(0.0f);
}
internal USBM.MyDeviceInfo GetInfoForDevice()
{
byte[] lpBuffer = new byte[65];
byte[] INBuffer = new byte[65];
uint lpNumberOfBytesWritten = 0;
uint lpNumberOfBytesRead = 0;
uint num1 = 0;
uint num2 = 0;
uint num3 = 0;
uint num4 = 0;
uint num5 = 0;
USBM.MyDeviceInfo myDeviceInfo = new USBM.MyDeviceInfo();
try
{
if (this.AttachedState)
{
lpBuffer[0] = (byte)0;
lpBuffer[1] = byte.MaxValue;
lpBuffer[2] = (byte)55;
for (uint index = 3; index < 65U; ++index)
{
lpBuffer[index] = byte.MaxValue;
}
if (USBM.WriteFile(this.WriteHandleToUSBDevice, lpBuffer, 65U, ref lpNumberOfBytesWritten, IntPtr.Zero))
{
INBuffer[0] = (byte)0;
if (this.ReadFileManagedBuffer(this.ReadHandleToUSBDevice, INBuffer, 65U, ref lpNumberOfBytesRead, IntPtr.Zero))
{
num1 = ((uint)INBuffer[9] << 8) + (uint)INBuffer[8];
num2 = ((uint)INBuffer[9] << 8) + (uint)INBuffer[8];
num3 = ((uint)INBuffer[17] << 8) + (uint)INBuffer[16];
num4 = ((uint)INBuffer[19] << 8) + (uint)INBuffer[18];
num5 = ((uint)INBuffer[21] << 8) + (uint)INBuffer[20];
}
}
myDeviceInfo.CalibValue = (double)num1 / 10000.0;
myDeviceInfo.CalibValue1 = 1.0 + ((double)num2 - 30000.0) * 1E-05;
myDeviceInfo.CalibValue2 = 1.0 + ((double)num3 - 30000.0) * 1E-05;
myDeviceInfo.CalibValue3 = 1.0 + ((double)num4 - 30000.0) * 1E-05;
myDeviceInfo.CalibValue4 = 1.0 + ((double)num5 - 30000.0) * 1E-05;
myDeviceInfo.Subtype = (int)INBuffer[7];
myDeviceInfo.UnitVersion = (int)INBuffer[6];
}
}
catch (Exception ex)
{
}
return(myDeviceInfo);
}
private static void ObserverThread()
{
try
{
var device = new USBM();
if (!device.OpenDevice())
{
throw new Exception("Could not open device.");
}
while (true)
{
var volts = device.GetMeasuredValue();
if (volts == 0.0f)
{
throw new Exception("Value read from device was zero. This indicates the device may not be working. Restarting to try to recover.");
}
var ppmPerVolt = 197.5f; // Experimentally determined - looks perfectly linear.
var ppm = (int)(volts * ppmPerVolt);
Measurements.Inc();
Volts.Set(volts);
Ppm.Set(ppm);
Console.WriteLine($"{volts:#00.000} V\t\t{ppm} PPM");
Thread.Sleep(TimeSpan.FromSeconds(1));
}
}
catch (Exception ex)
{
// Oh no! This is fatal error.
Console.WriteLine(ex.ToString());
Console.WriteLine("Will restart after sleeping for a while.");
Thread.Sleep(TimeSpan.FromSeconds(30));
Process.GetCurrentProcess().Kill();
}
}
private bool CheckIfPresentAndGetUSBDevicePath()
{
try
{
IntPtr zero1 = IntPtr.Zero;
USBM.SP_DEVICE_INTERFACE_DATA DeviceInterfaceData = new USBM.SP_DEVICE_INTERFACE_DATA();
USBM.SP_DEVICE_INTERFACE_DETAIL_DATA interfaceDetailData = new USBM.SP_DEVICE_INTERFACE_DETAIL_DATA();
USBM.SP_DEVINFO_DATA spDevinfoData = new USBM.SP_DEVINFO_DATA();
uint MemberIndex = 0;
uint PropertyRegDataType = 0;
uint RequiredSize1 = 0;
uint RequiredSize2 = 0;
uint RequiredSize3 = 0;
IntPtr zero2 = IntPtr.Zero;
uint num1 = 0;
string str = "Vid_04d8&Pid_fc39";
IntPtr classDevs = USBM.SetupDiGetClassDevs(ref this.InterfaceClassGuid, IntPtr.Zero, IntPtr.Zero, 18U);
if (!(classDevs != IntPtr.Zero))
{
return(false);
}
do
{
DeviceInterfaceData.cbSize = (uint)Marshal.SizeOf((object)DeviceInterfaceData);
if (USBM.SetupDiEnumDeviceInterfaces(classDevs, IntPtr.Zero, ref this.InterfaceClassGuid, MemberIndex, ref DeviceInterfaceData))
{
if (Marshal.GetLastWin32Error() == 259)
{
USBM.SetupDiDestroyDeviceInfoList(classDevs);
return(false);
}
spDevinfoData.cbSize = (uint)Marshal.SizeOf((object)spDevinfoData);
USBM.SetupDiEnumDeviceInfo(classDevs, MemberIndex, ref spDevinfoData);
USBM.SetupDiGetDeviceRegistryProperty(classDevs, ref spDevinfoData, 1U, ref PropertyRegDataType, IntPtr.Zero, 0U, ref RequiredSize1);
IntPtr num2 = Marshal.AllocHGlobal((int)RequiredSize1);
USBM.SetupDiGetDeviceRegistryProperty(classDevs, ref spDevinfoData, 1U, ref PropertyRegDataType, num2, RequiredSize1, ref RequiredSize2);
string stringUni = Marshal.PtrToStringUni(num2);
Marshal.FreeHGlobal(num2);
string lowerInvariant = stringUni.ToLowerInvariant();
str = str.ToLowerInvariant();
if (lowerInvariant.Contains(str))
{
// Just... it just is. I don't get it.
interfaceDetailData.cbSize = 8;
USBM.SetupDiGetDeviceInterfaceDetail(classDevs, ref DeviceInterfaceData, IntPtr.Zero, 0U, ref RequiredSize3, IntPtr.Zero);
IntPtr zero3 = IntPtr.Zero;
IntPtr detailDataReal = Marshal.AllocHGlobal((int)RequiredSize3);
Marshal.StructureToPtr(interfaceDetailData, detailDataReal, false);
if (USBM.SetupDiGetDeviceInterfaceDetail(classDevs, ref DeviceInterfaceData, detailDataReal, RequiredSize3, IntPtr.Zero, IntPtr.Zero))
{
// Starts right after the 4 byte size.
this.DevicePath = Marshal.PtrToStringUni(new IntPtr(detailDataReal.ToInt64() + 4));
USBM.SetupDiDestroyDeviceInfoList(classDevs);
Marshal.FreeHGlobal(detailDataReal);
return(true);
}
Marshal.GetLastWin32Error();
USBM.SetupDiDestroyDeviceInfoList(classDevs);
Marshal.FreeHGlobal(detailDataReal);
return(false);
}
++MemberIndex;
++num1;
}
else
{
uint lastWin32Error = (uint)Marshal.GetLastWin32Error();
USBM.SetupDiDestroyDeviceInfoList(classDevs);
return(false);
}
}while (num1 != 10000000U);
return(false);
}
catch
{
return(false);
}
}