/// <summary>
/// Enumerates all valid USB devics of the specified Vid.
/// </summary>
/// <returns>list of all devices found, ordered by USB port connection</returns>
public static IList <PIEDevice> EnumeratePIE(int vid)
{
// FileIOApiDeclarations.SECURITY_ATTRIBUTES securityAttrUnusedE = new FileIOApiDeclarations.SECURITY_ATTRIBUTES();
List <PIEDevice> devices = new List <PIEDevice>();
// Get all device paths
Guid guid = Guid.Empty;
HidApiDeclarations.HidD_GetHidGuid(ref guid);
IntPtr deviceInfoSet = DeviceManagementApiDeclarations.SetupDiGetClassDevs(ref guid, null, IntPtr.Zero,
DeviceManagementApiDeclarations.DIGCF_PRESENT | DeviceManagementApiDeclarations.DIGCF_DEVICEINTERFACE);
DeviceManagementApiDeclarations.SP_DEVICE_INTERFACE_DATA deviceInterfaceData = new DeviceManagementApiDeclarations.SP_DEVICE_INTERFACE_DATA();
deviceInterfaceData.Size = Marshal.SizeOf(deviceInterfaceData); //28;
List <string> paths = new List <string>();
for (int i = 0; 0 != DeviceManagementApiDeclarations.SetupDiEnumDeviceInterfaces(deviceInfoSet, 0, ref guid, i, ref deviceInterfaceData); i++)
{
int buffSize = 0;
DeviceManagementApiDeclarations.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, IntPtr.Zero, 0, ref buffSize, IntPtr.Zero);
// Use IntPtr to simulate detail data structure
IntPtr detailBuffer = Marshal.AllocHGlobal(buffSize);
// sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) depends on the process bitness,
// it's 6 with an X86 process (byte packing + 1 char, auto -> unicode -> 4 + 2*1)
// and 8 with an X64 process (8 bytes packing anyway).
Marshal.WriteInt32(detailBuffer, Environment.Is64BitProcess ? 8 : 6);
if (DeviceManagementApiDeclarations.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, detailBuffer, buffSize, ref buffSize, IntPtr.Zero))
{
// convert buffer (starting past the cbsize variable) to string path
paths.Add(Marshal.PtrToStringAuto(detailBuffer + 4));
}
}
_ = DeviceManagementApiDeclarations.SetupDiDestroyDeviceInfoList(deviceInfoSet);
foreach (string devicePath in paths)
{
IntPtr fileH = FileIOApiDeclarations.CreateFile(devicePath, FileIOApiDeclarations.GENERIC_WRITE,
FileIOApiDeclarations.FILE_SHARE_READ | FileIOApiDeclarations.FILE_SHARE_WRITE,
IntPtr.Zero, FileIOApiDeclarations.OPEN_EXISTING, 0, 0);
SafeFileHandle fileHandle = new SafeFileHandle(fileH, true);
if (fileHandle.IsInvalid)
{
// Bad handle, try next path
continue;
}
try
{
HidApiDeclarations.HIDD_ATTRIBUTES hidAttributes = new HidApiDeclarations.HIDD_ATTRIBUTES();
hidAttributes.Size = Marshal.SizeOf(hidAttributes);
if (0 != HidApiDeclarations.HidD_GetAttributes(fileHandle, ref hidAttributes) && hidAttributes.VendorID == vid)
{
// Good attributes and right vid, try to get caps
IntPtr pPerparsedData = new IntPtr();
if (HidApiDeclarations.HidD_GetPreparsedData(fileHandle, ref pPerparsedData))
{
HidApiDeclarations.HIDP_CAPS hidCaps = new HidApiDeclarations.HIDP_CAPS();
if (0 != HidApiDeclarations.HidP_GetCaps(pPerparsedData, ref hidCaps))
{
// Got Capabilities, add device to list
char[] Mstring = new char[128];
StringBuilder manufacturer = new StringBuilder();
StringBuilder productName = new StringBuilder();
_ = HidApiDeclarations.HidD_GetManufacturerString(fileHandle, manufacturer, 128);
_ = HidApiDeclarations.HidD_GetProductString(fileHandle, productName, 128);
devices.Add(new PIEDevice(devicePath, hidAttributes.VendorID, hidAttributes.ProductID, hidAttributes.VersionNumber, hidCaps.Usage,
hidCaps.UsagePage, hidCaps.InputReportByteLength, hidCaps.OutputReportByteLength, manufacturer.ToString(), productName.ToString()));
}
}
}
}
catch (Exception)
{
continue;
}
finally
{
fileHandle.Close();
}
}
return(devices);
}
//-----------------------------------------------------------------------------
/// <summary>
/// Sets connection to the enumerated device.
/// If inputReportSize greater than zero it generates a read handle.
/// If outputReportSize greater than zero it generates a write handle.
/// </summary>
/// <returns></returns>
public int SetupInterface()
{
int retin = 0;
int retout = 0;
if (null != cts)
{
cts.Cancel();
cts.Dispose();
}
cts = new CancellationTokenSource();
if (connected)
{
return(203);
}
if (ReadLength > 0)
{
IntPtr readFileH = FileIOApiDeclarations.CreateFile(Path, FileIOApiDeclarations.GENERIC_READ,
FileIOApiDeclarations.FILE_SHARE_READ | FileIOApiDeclarations.FILE_SHARE_WRITE,
IntPtr.Zero, FileIOApiDeclarations.OPEN_EXISTING, FileIOApiDeclarations.FILE_FLAG_OVERLAPPED, 0);
readFileHandle = new SafeFileHandle(readFileH, true);
if (readFileHandle.IsInvalid)
{
readRing = null;
retin = 207;
}
else
{
readRing = new RingBuffer(128, ReadLength);
_ = ReadFromHid();
}
}
if (WriteLength > 0)
{
IntPtr writeFileH = FileIOApiDeclarations.CreateFile(Path, FileIOApiDeclarations.GENERIC_WRITE,
FileIOApiDeclarations.FILE_SHARE_READ | FileIOApiDeclarations.FILE_SHARE_WRITE,
IntPtr.Zero, FileIOApiDeclarations.OPEN_EXISTING,
FileIOApiDeclarations.FILE_FLAG_OVERLAPPED,
0);
writeFileHandle = new SafeFileHandle(writeFileH, true);
if (writeFileHandle.IsInvalid)
{
writeRing = null;
retout = 208;
}
else
{
writeRing = new RingBuffer(128, WriteLength);
_ = WriteToHid();
}
}
if ((retin == 0) && (retout == 0))
{
connected = true;
return(0);
}
else if ((retin == 207) && (retout == 208))
{
return(209);
}
else
{
return(retin + retout);
}
}
