public int GetReportLength(ReportType type, byte reportId)
{
int bitLength = 0;
List <ValueCaps> caps = null;
switch (type)
{
case ReportType.Input:
caps = inputValueCaps;
break;
case ReportType.Output:
caps = outputValueCaps;
break;
case ReportType.Feature:
caps = featureValueCaps;
break;
}
if (caps == null)
{
return(0);
}
for (int i = 0; i < caps.Count; i++)
{
ValueCaps c = caps[i];
if (c.ReportID == reportId)
{
bitLength += c.ReportCount * c.BitSize;
}
}
return(bitLength / 8);
}
public HidDevice(string path)
{
//device mutex
lockObject = new object();
//static buffers
strBuffer = new byte[256];
//open device
reference = Kernel32.File.Create(path, Kernel32.FileAccess.GenericWrite, Kernel32.FileShare.Read | Kernel32.FileShare.Write, IntPtr.Zero, CreationDisposition.OpenExisting, Kernel32.FileAttributes.Overlapped, IntPtr.Zero);
if (reference.IsInvalid)
{
return;
}
//overlapped
fileEvent = new ManualResetEvent(false);
fileOverlapped = new SafeOverlapped(fileEvent);
//get preparsed data
IntPtr preparsed;
if (!NativeMethods.HidD_GetPreparsedData(reference, out preparsed))
{
return;
}
preparsedData = new PreparsedData(preparsed);
//transfer buffers
Caps capabilities = preparsedData.Capabilities;
inBuffer = new byte[capabilities.InputReportByteLength];
outBuffer = new byte[capabilities.OutputReportByteLength];
featureBuffer = new byte[capabilities.FeatureReportByteLength];
//dynamic caps
inputValueCaps = new List <ValueCaps>();
outputValueCaps = new List <ValueCaps>();
featureValueCaps = new List <ValueCaps>();
ushort numInputCaps = capabilities.NumberInputValueCaps;
ushort numOutputCaps = capabilities.NumberOutputValueCaps;
ushort numFeatureCaps = capabilities.NumberFeatureValueCaps;
ushort maxValueCaps = Math.Max(numInputCaps, numOutputCaps);
maxValueCaps = Math.Max(maxValueCaps, numFeatureCaps);
int valueCapSize = Marshal.SizeOf <ValueCaps>();
IntPtr valueCapPtr = Marshal.AllocHGlobal(maxValueCaps * valueCapSize);
HidPStatus stat = NativeMethods.HidP_GetValueCaps(ReportType.Input, valueCapPtr, ref numInputCaps, preparsed);
for (int i = 0; i < numInputCaps; i++)
{
ValueCaps val = Marshal.PtrToStructure <ValueCaps>(new IntPtr(valueCapPtr.ToInt64() + (i * valueCapSize)));
inputValueCaps.Add(val);
}
stat = NativeMethods.HidP_GetValueCaps(ReportType.Output, valueCapPtr, ref numOutputCaps, preparsed);
for (int i = 0; i < numOutputCaps; i++)
{
ValueCaps val = Marshal.PtrToStructure <ValueCaps>(new IntPtr(valueCapPtr.ToInt64() + i * valueCapSize));
outputValueCaps.Add(val);
}
stat = NativeMethods.HidP_GetValueCaps(ReportType.Feature, valueCapPtr, ref numFeatureCaps, preparsed);
for (int i = 0; i < numFeatureCaps; i++)
{
ValueCaps val = Marshal.PtrToStructure <ValueCaps>(new IntPtr(valueCapPtr.ToInt64() + i * valueCapSize));
featureValueCaps.Add(val);
}
Marshal.FreeHGlobal(valueCapPtr);
}