/// <summary>
/// List all attached devices with specific VID_PID
/// </summary>
/// <param name="vendorID">device vendor ID</param>
/// <param name="productID">device product ID</param>
/// <param name="devicePathName">list of path name to open device with CreateFile()</param>
/// <returns></returns>
public static int FindDevices(short vendorID, short productID, ref string[] devicePathName)
{
string[] hidDevicePathName = new string[0];
int i = 0;
int numberOfDevicesFound = 0;
SafeFileHandle deviceHandle;
bool result = false;
Win32.HIDD_ATTRIBUTES deviceAttributes = new Win32.HIDD_ATTRIBUTES();
FindHidDevice(ref hidDevicePathName);
devicePathName = new string[0];
for (i = 0; i < hidDevicePathName.Length; i++)
{
deviceHandle = Win32.CreateFile(hidDevicePathName[i], 0, Win32.FILE_SHARE_READ | Win32.FILE_SHARE_WRITE, IntPtr.Zero, Win32.OPEN_EXISTING, 0, 0);
if (!deviceHandle.IsInvalid)
{
result = Win32.HidD_GetAttributes(deviceHandle, ref deviceAttributes);
if (result && deviceAttributes.ProductID == productID && deviceAttributes.VendorID == vendorID)
{
numberOfDevicesFound += 1;
Array.Resize(ref devicePathName, numberOfDevicesFound);
devicePathName[numberOfDevicesFound - 1] = hidDevicePathName[i];
}
deviceHandle.Close();
}
}
return(numberOfDevicesFound);
}
/// <summary>
/// Private constructor.
/// </summary>
/// <param name="hRawInputDevice"></param>
private void Construct(IntPtr hRawInputDevice)
{
PreParsedData = IntPtr.Zero;
iInputButtonCapabilities = null;
iInputValueCapabilities = null;
//Fetch various information defining the given HID device
Name = Win32.RawInput.GetDeviceName(hRawInputDevice);
//Fetch device info
iInfo = new RID_DEVICE_INFO();
if (!Win32.RawInput.GetDeviceInfo(hRawInputDevice, ref iInfo))
{
throw new Exception("HidDevice: GetDeviceInfo failed: " + Marshal.GetLastWin32Error().ToString());
}
//Open our device from the device name/path
SafeFileHandle handle = Win32.Function.CreateFile(Name,
Win32.FileAccess.NONE,
Win32.FileShare.FILE_SHARE_READ | Win32.FileShare.FILE_SHARE_WRITE,
IntPtr.Zero,
Win32.CreationDisposition.OPEN_EXISTING,
Win32.FileFlagsAttributes.FILE_FLAG_OVERLAPPED,
IntPtr.Zero
);
//Check if CreateFile worked
if (handle.IsInvalid)
{
throw new Exception("HidDevice: CreateFile failed: " + Marshal.GetLastWin32Error().ToString());
}
//Get manufacturer string
StringBuilder manufacturerString = new StringBuilder(256);
if (Win32.Function.HidD_GetManufacturerString(handle, manufacturerString, manufacturerString.Capacity))
{
Manufacturer = manufacturerString.ToString();
}
//Get product string
StringBuilder productString = new StringBuilder(256);
if (Win32.Function.HidD_GetProductString(handle, productString, productString.Capacity))
{
Product = productString.ToString();
}
//Get attributes
Win32.HIDD_ATTRIBUTES attributes = new Win32.HIDD_ATTRIBUTES();
if (Win32.Function.HidD_GetAttributes(handle, ref attributes))
{
VendorId = attributes.VendorID;
ProductId = attributes.ProductID;
Version = attributes.VersionNumber;
}
handle.Close();
SetFriendlyName();
//Get our HID descriptor pre-parsed data
PreParsedData = Win32.RawInput.GetPreParsedData(hRawInputDevice);
if (PreParsedData == IntPtr.Zero)
{
//We are done then.
//Some devices don't have pre-parsed data.
return;
}
//Get capabilities
HidStatus status = Win32.Function.HidP_GetCaps(PreParsedData, ref iCapabilities);
if (status != HidStatus.HIDP_STATUS_SUCCESS)
{
throw new Exception("HidDevice: HidP_GetCaps failed: " + status.ToString());
}
SetInputCapabilitiesDescription();
//Get input button caps if needed
if (Capabilities.NumberInputButtonCaps > 0)
{
iInputButtonCapabilities = new HIDP_BUTTON_CAPS[Capabilities.NumberInputButtonCaps];
ushort buttonCapabilitiesLength = Capabilities.NumberInputButtonCaps;
status = Win32.Function.HidP_GetButtonCaps(HIDP_REPORT_TYPE.HidP_Input, iInputButtonCapabilities, ref buttonCapabilitiesLength, PreParsedData);
if (status != HidStatus.HIDP_STATUS_SUCCESS || buttonCapabilitiesLength != Capabilities.NumberInputButtonCaps)
{
throw new Exception("HidDevice: HidP_GetButtonCaps failed: " + status.ToString());
}
ComputeButtonCount();
}
//Get input value caps if needed
if (Capabilities.NumberInputValueCaps > 0)
{
iInputValueCapabilities = new HIDP_VALUE_CAPS[Capabilities.NumberInputValueCaps];
ushort valueCapabilitiesLength = Capabilities.NumberInputValueCaps;
status = Win32.Function.HidP_GetValueCaps(HIDP_REPORT_TYPE.HidP_Input, iInputValueCapabilities, ref valueCapabilitiesLength, PreParsedData);
if (status != HidStatus.HIDP_STATUS_SUCCESS || valueCapabilitiesLength != Capabilities.NumberInputValueCaps)
{
throw new Exception("HidDevice: HidP_GetValueCaps failed: " + status.ToString());
}
}
}
