/// <summary>
/// Helper method to return the device path given a DeviceInterfaceData structure and an InfoSet handle.
/// Used in 'FindDevice' so check that method out to see how to get an InfoSet handle and a DeviceInterfaceData.
/// </summary>
/// <param name="infoSetPointer">Handle to the InfoSet</param>
/// <param name="deviceInterfaceData">DeviceInterfaceData structure</param>
/// <returns>The device path or null if there was some problem</returns>
internal static string GetDevicePath(IntPtr infoSetPointer, ref Win32USB.DeviceInterfaceData deviceInterfaceData)
{
uint requiredSize = 0;
// Get the device interface details
if (Win32USB.SetupDiGetDeviceInterfaceDetail(infoSetPointer, ref deviceInterfaceData, IntPtr.Zero, 0, ref requiredSize, IntPtr.Zero) == false)
{
var deviceInterfaceDetailData = new Win32USB.DeviceInterfaceDetailData();
if (IntPtr.Size == 8)
{
deviceInterfaceDetailData.Size = 8;
}
else
{
deviceInterfaceDetailData.Size = 5;
}
if (Win32USB.SetupDiGetDeviceInterfaceDetail(infoSetPointer, ref deviceInterfaceData, ref deviceInterfaceDetailData, requiredSize, ref requiredSize, IntPtr.Zero))
{
return(deviceInterfaceDetailData.DevicePath);
}
}
return(null);
}
public static IEnumerable <DeviceInfo> GetDevices(ushort vendorID, ushort productID)
{
Guid gHid = HID.Guid;
IntPtr infoSetPointer = Win32USB.SetupDiGetClassDevs(ref gHid, null, IntPtr.Zero, Win32USB.DIGCF_DEVICEINTERFACE | Win32USB.DIGCF_PRESENT);
try
{
var deviceInterfaceData = new Win32USB.DeviceInterfaceData();
deviceInterfaceData.Size = Marshal.SizeOf(deviceInterfaceData);
int index = 0;
while (Win32USB.SetupDiEnumDeviceInterfaces(infoSetPointer, 0, ref gHid, (uint)index, ref deviceInterfaceData))
{
string devicePath = GetDevicePath(infoSetPointer, ref deviceInterfaceData);
if (devicePath != null)
{
if (vendorID == 0 && productID == 0)
{
yield return(new DeviceInfo(devicePath));
}
else
{
if (DeviceInfo.ParseDevicePath(devicePath, out ushort localVendorID, out ushort localProductID, out uint localIdentifier) &&
localVendorID == vendorID && localProductID == productID)
{
yield return(new DeviceInfo(devicePath));
}
}
}
index++;
}
}
finally
{
Win32USB.SetupDiDestroyDeviceInfoList(infoSetPointer);
}
}