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);
}
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;
}
}