//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);
}
private void Form1_Load(object sender, EventArgs e)
{
Guid hidGuid = Guid.Empty;
Hid.HidD_GetHidGuid(ref hidGuid);
IntPtr deviceNotificationHandle;
deviceNotificationHandle = IntPtr.Zero;
RegisterForDeviceNotifications("", this.Handle, hidGuid, ref deviceNotificationHandle);
}
// 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);
}
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_DEVICECHANGE)
{
if ((m.WParam.ToInt32() == DBT_DEVICEARRIVAL))
{
//// Look for a colorimeter if one isn't already attached
if (colorimeter == null)
{
Guid colorimeterGuid = Guid.Empty;
Hid.HidD_GetHidGuid(ref colorimeterGuid);
String[] devicePathNames = MyDeviceManagement.FindDevicePathsFromGuid(colorimeterGuid, NUMBER_OF_DEVICE_PATHNAMES);
var devicePath = Hid.FindDevicePath(Colorimeter.COLORIMETER_PRODUCT_ID, Colorimeter.COLORIMETER_VENDOR_ID, devicePathNames);
var readHandle = FileIO.CreateFile(devicePath, FileIO.GENERIC_READ, FileIO.FILE_SHARE_READ | FileIO.FILE_SHARE_WRITE, IntPtr.Zero, FileIO.OPEN_EXISTING, FileIO.FILE_FLAG_OVERLAPPED, 0);
//we have found a viable colorimeter with a working path and handle
if (!devicePath.Equals(null) && !readHandle.IsInvalid)
{
//colorimeterDetected = true;
colorimeter = new Colorimeter(readHandle, devicePath);
// Start checkColorimeterDeviceStateBackgroundWorker
// When the Background Worker completes, a different backgroundworker
// is called to get the firmware and test file versions
var request = new ColorimeterRequest()
{
ColorimeterRequestActionType = ColorimeterActionType.FirmwareVersion | ColorimeterActionType.TestFileVersion | ColorimeterActionType.DeviceState
};
if (!colorimeterConnectedBackgroundWorker.IsBusy)
{
colorimeterConnectedBackgroundWorker.RunWorkerAsync(request);
}
}
}
//// Find out if it's the device we're communicating with.
if (MyDeviceManagement.DeviceNameMatch(m, colorimeter.colorimeterPathName))
{
listBox1.Items.Add("Colorimeter attached.");
}
}
// If WParam contains DBT_DEVICEREMOVAL, a device has been removed. We only care if the removed device is a colorimeter we are already talking to
else if ((m.WParam.ToInt32() == DBT_DEVICEREMOVECOMPLETE) && colorimeter != null)
{
if (MyDeviceManagement.DeviceNameMatch(m, colorimeter.colorimeterPathName))
{
listBox1.Items.Add("Colorimeter removed.");
//colorimeterDetected = false;
colorimeter = null;
}
}
listBox1.SelectedIndex = listBox1.Items.Count - 1;
}
}
