//Use this constructor to initialize a device
public Colorimeter(SafeFileHandle handle, string pathName)
{
// Get handles to use in requesting Input and Output reports.
readHandle = handle;
colorimeterPathName = pathName;
//get the Hid Handle from the pathName
hidHandle = FileIO.CreateFile(colorimeterPathName, 0, FileIO.FILE_SHARE_READ | FileIO.FILE_SHARE_WRITE, IntPtr.Zero, FileIO.OPEN_EXISTING, 0, 0);
// Learn the capabilities of the device.
MyHid.Capabilities = MyHid.GetDeviceCapabilities(hidHandle);
MyHid.DeviceAttributes.Size = Marshal.SizeOf(MyHid.DeviceAttributes);
Hid.HidD_GetAttributes(hidHandle, ref MyHid.DeviceAttributes);
// Initialize input report buffer
inputBuffer = new byte[MyHid.Capabilities.InputReportByteLength];
newInputData = false;
writeHandle = FileIO.CreateFile(colorimeterPathName, FileIO.GENERIC_WRITE, FileIO.FILE_SHARE_READ | FileIO.FILE_SHARE_WRITE, IntPtr.Zero, FileIO.OPEN_EXISTING, 0, 0);
// Flush any waiting reports in the input buffer. (optional)
MyHid.FlushQueue(readHandle);
}
// If IsRange is false, UsageMin is the Usage and UsageMax is unused.
// If IsStringRange is false, StringMin is the String index and StringMax is unused.
// If IsDesignatorRange is false, DesignatorMin is the designator index and DesignatorMax is unused.
public static string FindDevicePath(short productID, short vendorID, String[] devicePathNames)
{
try
{
if (devicePathNames.Length > 0)
{
foreach (var devicePathName in devicePathNames)
{
//iterate through all possible device paths to see if the hidhandle matches the ones for out devices
var hidHandle = FileIO.CreateFile(devicePathName, 0, FileIO.FILE_SHARE_READ | FileIO.FILE_SHARE_WRITE, IntPtr.Zero, FileIO.OPEN_EXISTING, 0, 0);
if (!hidHandle.IsInvalid)
{
//we need to set this in another location, as it has nothing to do with this method
//moving this to Colorimeter constructor
//MyHid.DeviceAttributes.Size = Marshal.SizeOf(MyHid.DeviceAttributes);
var hidDeviceAttributes = new Hid.HIDD_ATTRIBUTES();
if (Hid.HidD_GetAttributes(hidHandle, ref hidDeviceAttributes))
{
// Find out if the device matches the one we're looking for.
if ((hidDeviceAttributes.VendorID == vendorID) && (hidDeviceAttributes.ProductID == productID))
{
return(devicePathName);
}
else
{
hidHandle.Close();
}
}
else
{
hidHandle.Close();
}
}
}
}
}
catch (Exception ex)
{
}
return(null);
}
