public static bool IsConnected()
{
var result = false;
var handle = HIDAPI.hid_open(VENDOR_ID, PRODUCT_ID, IntPtr.Zero);
if (handle.ToInt32() > 0)
{
try
{
result = true;
}
finally
{
HIDAPI.hid_close(handle);
}
}
return(result);
}
private static byte[] PerformRead(IntPtr handle)
{
var inBuffer = new byte[61];
var numRead = HIDAPI.hid_read(handle, inBuffer, inBuffer.Length);
if (numRead == 0)
{
return(null);
}
if (inBuffer[0] != 0x01)
{
return(null);
}
var payloadSize = inBuffer[1];
var payload = new byte[payloadSize];
Array.Copy(inBuffer, 2, payload, 0, payloadSize);
return(payload);
}
public static Record[] ReadRecord()
{
var records = new List <Record>();
var handle = HIDAPI.hid_open(VENDOR_ID, PRODUCT_ID, IntPtr.Zero);
if (handle.ToInt32() <= 0)
{
Debug.Print("Could not open device.");
return(null);
}
try
{
var outBuffer = new byte[]
{
0x02, // USB Read Report
0x02, // Size of payload
READ_RECORD, // READ_RECORD
READ_RECORD // Checksum (only one byte so same as command)
};
var numWritten = HIDAPI.hid_write(handle, outBuffer, outBuffer.Length);
if (numWritten < 4)
{
Debug.Print("Failed to write request to device.");
return(null);
}
using (var mem = new MemoryStream(1024))
{
var payload = PerformRead(handle);
if (payload == null)
{
Debug.Print("Could not read data from device.");
return(null);
}
if (payload[0] != READ_RECORD)
{
Debug.Print("Payload is not a READ_RECORD result.");
return(null);
}
var totalSize = payload[1];
var data = new byte[payload.Length - 2];
Array.Copy(payload, 2, data, 0, data.Length);
mem.Write(data, 0, data.Length);
while (mem.Length < totalSize)
{
data = PerformRead(handle);
if (data == null)
{
Debug.Print("Could not read data from device.");
return(null);
}
if ((mem.Length + data.Length) >= totalSize)
{
mem.Write(data, 0, data.Length - 1); // -1 because we don't want to include the final checksum byte
}
else
{
mem.Write(data, 0, data.Length);
}
}
mem.Seek(0, SeekOrigin.Begin);
while (mem.Position < mem.Length)
{
var type = Utils.ReadByte(mem);
var item = type;
var hasDate = (type & ITEM_DATE) != 0;
var hasTime = (type & ITEM_TIME) != 0;
if (hasDate)
{
item = Convert.ToByte(item & ~ITEM_DATE);
}
if (hasTime)
{
item = Convert.ToByte(item & ~ITEM_TIME);
}
var valueBytes = new byte[0];
switch (item)
{
case ITEM_INTEMP:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_OUTTEMP:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_DEWPOINT:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_WINDCHILL:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_HEATINDEX:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_INHUMI:
valueBytes = Utils.ReadBytes(mem, 1);
break;
case ITEM_OUTHUMI:
valueBytes = Utils.ReadBytes(mem, 1);
break;
case ITEM_ABSBARO:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_RELBARO:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_WINDDIRECTION:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_WINDSPEED:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_GUSTSPEED:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_RAINEVENT:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINRATE:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINHOUR:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINDAY:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINWEEK:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINMONTH:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINYEAR:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_RAINTOTALS:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_LIGHT:
valueBytes = Utils.ReadBytes(mem, 4);
break;
case ITEM_UV:
valueBytes = Utils.ReadBytes(mem, 2);
break;
case ITEM_UVI:
valueBytes = Utils.ReadBytes(mem, 1);
break;
default:
return(null);
}
RecordDate date = null;
RecordTime time = null;
if (hasDate)
{
var dateBuffer = new byte[3];
var numRead = mem.Read(dateBuffer, 0, dateBuffer.Length);
if (numRead < dateBuffer.Length)
{
Debug.Print("Could not read date from memory.");
return(null);
}
date = new RecordDate(dateBuffer[0], dateBuffer[1], dateBuffer[2]);
}
if (hasTime)
{
var timeBuffer = new byte[2];
var numRead = mem.Read(timeBuffer, 0, timeBuffer.Length);
if (numRead < timeBuffer.Length)
{
Debug.Print("Could not read time from memory.");
return(null);
}
time = new RecordTime(timeBuffer[0], timeBuffer[1]);
}
Record record = null;
switch (item)
{
case ITEM_INTEMP:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_OUTTEMP:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_DEWPOINT:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_WINDCHILL:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_HEATINDEX:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_INHUMI:
{
record = new Record8(item, date, time, valueBytes[0]);
break;
}
case ITEM_OUTHUMI:
{
record = new Record8(item, date, time, valueBytes[0]);
break;
}
case ITEM_ABSBARO:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_RELBARO:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_WINDDIRECTION:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_WINDSPEED:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_GUSTSPEED:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_RAINEVENT:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINRATE:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINHOUR:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINDAY:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINWEEK:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINMONTH:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINYEAR:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_RAINTOTALS:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_LIGHT:
{
uint value = BitConverter.ToUInt32(Utils.ReverseBytes(valueBytes), 0);
record = new Record32(item, date, time, value);
break;
}
case ITEM_UV:
{
ushort value = BitConverter.ToUInt16(Utils.ReverseBytes(valueBytes), 0);
record = new Record16(item, date, time, value);
break;
}
case ITEM_UVI:
{
record = new Record8(item, date, time, valueBytes[0]);
break;
}
}
if (record != null)
{
records.Add(record);
}
}
}
}
finally
{
HIDAPI.hid_close(handle);
}
return(records.ToArray());
}
