private NativeMethods.HIDP_CAPS GetDeviceCapabilities(SafeFileHandle hidHandle)
{
NativeMethods.HIDP_CAPS capabilities = new NativeMethods.HIDP_CAPS();
IntPtr preparsedDataPointer = new IntPtr();
bool success = NativeMethods.HidD_GetPreparsedData(hidHandle, ref preparsedDataPointer);
try {
int result = NativeMethods.HidP_GetCaps(preparsedDataPointer, ref capabilities);
} finally {
NativeMethods.HidD_FreePreparsedData(ref preparsedDataPointer);
}
return(capabilities);
}
private void OpenDevices(List <String> devicePathNames, int vendorId, int productId)
{
NativeMethods.HIDD_ATTRIBUTES deviceAttributes = new NativeMethods.HIDD_ATTRIBUTES();
deviceAttributes.Size = Marshal.SizeOf(typeof(NativeMethods.HIDD_ATTRIBUTES));
NativeMethods.SECURITY_ATTRIBUTES security = new NativeMethods.SECURITY_ATTRIBUTES();
security.SecurityDescriptor = 0;
security.InheritHandle = 1;
security.Length = Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES));
for (int i = 0; i < devicePathNames.Count; i++)
{
SafeFileHandle handle = NativeMethods.CreateFile(devicePathNames[i], 0, NativeMethods.FILE_SHARE_READ | NativeMethods.FILE_SHARE_WRITE, ref security, NativeMethods.OPEN_EXISTING, 0, 0);
if (!handle.IsInvalid)
{
bool success = NativeMethods.HidD_GetAttributes(handle, ref deviceAttributes);
if (success)
{
if ((deviceAttributes.VendorID == vendorId) && (deviceAttributes.ProductID == productId))
{
NativeMethods.HIDP_CAPS deviceCapabilities = GetDeviceCapabilities(handle);
// Finally open the device
if (deviceCapabilities.OutputReportByteLength == 65)
{
_controlHandle = NativeMethods.CreateFile(devicePathNames[i], NativeMethods.GENERIC_WRITE, NativeMethods.FILE_SHARE_READ | NativeMethods.FILE_SHARE_WRITE, ref security, NativeMethods.OPEN_EXISTING, 0, 0);
}
else
{
_setupHandle = NativeMethods.CreateFile(devicePathNames[i], NativeMethods.GENERIC_WRITE, NativeMethods.FILE_SHARE_READ | NativeMethods.FILE_SHARE_WRITE, ref security, NativeMethods.OPEN_EXISTING, 0, 0);
}
}
}
handle.Close();
}
}
}
