private void DetectHIDDevices(bool throwOnFail)
{
if (_devicesOpen)
{
CloseDevices(false);
}
var success = BIUSB.DetectHID(out _numDevices, _deviceList, BIUSB.DT_HID);
if (throwOnFail)
{
var lastError = Marshal.GetLastWin32Error();
//check to see if a Win32 error was returned as a result of
//the previous calls
if (lastError != 0)
{
//a Win32 API error occured, so throw it as a wrapped exception
Exception e = new Win32Exception(lastError);
throw new OperationFailedException(e.Message, e);
}
}
if (!success && throwOnFail)
{
throw new OperationFailedException("Failure detecting devices or no devices found.");
}
}
private static int ReadInputData(ref DeviceParam device, out byte[] databuffer, bool throwOnFail)
{
databuffer = new byte[BIUSB.MAX_INPUTS];
var result = BIUSB.ReadInputData(ref device, databuffer, 0);
if (throwOnFail)
{
var lastError = Marshal.GetLastWin32Error();
//check to see if a Win32 error was returned as a result of
//the previous calls
if (lastError != 0)
{
//a Win32 API error occured, so throw it as a wrapped exception
Exception e = new Win32Exception(lastError);
throw new OperationFailedException(e.Message, e);
}
switch (result)
{
case BIUSB.DEV_TIMEOUT:
throw new TimeoutException("Device did not respond within 1 second.");
case BIUSB.DEV_FAILED:
throw new OperationFailedException("Failure reading from device.");
}
}
return(result);
}
private void CloseDevices(bool throwOnFail)
{
var success = BIUSB.CloseDevices(_numDevices, _deviceList);
if (throwOnFail)
{
var lastError = Marshal.GetLastWin32Error();
//check to see if a Win32 error was returned as a result of
//the previous calls
if (lastError != 0)
{
//a Win32 API error occured, so throw it as a wrapped exception
Exception e = new Win32Exception(lastError);
throw new OperationFailedException(e.Message, e);
}
}
if (!success && throwOnFail)
{
throw new OperationFailedException("Failure closing devices or releasing memory.");
}
_devicesOpen &= !success;
}
