protected override bool TryCreateHidDevice(object key, out Device device)
{
var path = (HidDevicePath)key;
device = WinHidDevice.TryCreate(path.DevicePath, path.DeviceID);
return(device != null);
}
protected override bool TryCreateDevice(object key, out HidDevice device, out object completionState)
{
string path = (string)key;
var hidDevice = new WinHidDevice(path);
IntPtr handle = NativeMethods.CreateFileFromDevice(path, NativeMethods.EFileAccess.None, NativeMethods.EFileShare.All);
device = null;
completionState = null;
if (handle == (IntPtr)(-1))
{
return(false);
}
bool ok = false;
try {
ok = hidDevice.GetInfo(handle);
} catch {
}
if (!ok)
{
NativeMethods.CloseHandle(handle);
return(false);
}
device = hidDevice;
completionState = handle;
return(true);
}
internal void Init(string path, WinHidDevice device)
{
IntPtr handle = NativeMethods.CreateFileFromDevice(path, NativeMethods.EFileAccess.Read | NativeMethods.EFileAccess.Write, NativeMethods.EFileShare.All);
if (handle == (IntPtr)(-1)) { throw new IOException("Unable to open HID class device."); }
_device = device;
_handle = handle;
HandleInitAndOpen();
}
protected override bool TryCreateDevice(object key, out HidDevice device, out object completionState)
{
string path = (string)key; var hidDevice = new WinHidDevice(path);
IntPtr handle = NativeMethods.CreateFileFromDevice(path, NativeMethods.EFileAccess.None, NativeMethods.EFileShare.All);
device = null; completionState = null; if (handle == (IntPtr)(-1)) { return false; }
bool ok = false;
try { ok = hidDevice.GetInfo(handle); } catch { }
if (!ok) { NativeMethods.CloseHandle(handle); return false; }
device = hidDevice; completionState = handle;
return true;
}
internal void Init(string path, WinHidDevice device)
{
IntPtr handle = NativeMethods.CreateFileFromDevice(path, NativeMethods.EFileAccess.Read | NativeMethods.EFileAccess.Write, NativeMethods.EFileShare.All);
if (handle == (IntPtr)(-1))
{
throw new IOException("Unable to open HID class device.");
}
_device = device;
_handle = handle;
HandleInitAndOpen();
}
internal static WinHidDevice TryCreate(string path, string id)
{
var d = new WinHidDevice()
{
_path = path, _id = id
};
return(d.TryOpenToGetInfo(handle =>
{
NativeMethods.HIDD_ATTRIBUTES attributes = new NativeMethods.HIDD_ATTRIBUTES();
attributes.Size = Marshal.SizeOf(attributes);
if (!NativeMethods.HidD_GetAttributes(handle, ref attributes))
{
return false;
}
// Get VID, PID, version.
d._pid = attributes.ProductID;
d._vid = attributes.VendorID;
d._version = attributes.VersionNumber;
return true;
}) ? d : null);
}
internal WinHidStream(WinHidDevice device)
: base(device)
{
_closeEventHandle = NativeMethods.CreateManualResetEventOrThrow();
}
