// Build up device name from manufacturer, product name, and
// serial number strings. The index of each of these strings
// is in a fixed location in the device descriptor. Then add
// the device to the list box.
void GetDeviceName(UsbDevice dev)
{
byte[] arbBuf;
string strTag;
try
{
dev.Open();
// Get device descriptor
// bmRequestType = 0 - standard device request
// bRequest = 6 - Get_Descriptor
// wValue: high byte = 1 - device; low byte = 0 - descriptor index
// wIndex = 0 - not used
// wLength = 18 - length of descriptor
arbBuf = dev.ControlRead(0, 6, 0x100, 0, 18);
// Entries 14, 15, and 16 have the index of the manufacturer,
// product name, and serial number string descriptors, respectively.
strTag = GetStringDescriptor(dev, arbBuf[14]);
strTag += '/';
strTag += GetStringDescriptor(dev, arbBuf[15]);
strTag += '/';
strTag += GetStringDescriptor(dev, arbBuf[16]);
// Assign the combined ID string to the Tag.
dev.Tag = strTag;
}
catch (Exception exc)
{
dev.Tag = "Can't open: " + exc.Message;
}
dev.Close(); // done for now
// Use the Tag as the value to be returned by ToString().
// This makes it easy to add the UsbDevice to a list box.
dev.GetMyString = delegate(UsbDevice device) { return((string)device.Tag); };
// The list box will display ToString(), which is now the Tag.
lstDevices.Items.Add(dev);
}
// Helper function to get a string descriptor from the USB device.
string GetStringDescriptor(UsbDevice dev, int iString)
{
byte[] arbBuf;
if (iString != 0)
{
// Get the string descriptor:
// bmRequestType = 0 - standard device request
// bRequest = 6 - Get_Descriptor
// wValue: high byte = 3 - string; low byte = descriptor index
// wIndex = 0x409 - language ID, US English
// wLength = 255 - max length
arbBuf = dev.ControlRead(0, 6, (ushort)(iString | 0x300), 0x409, 255);
// arbBuf[0] = total length
// arbBuf[1] = 3 (string)
// arbBuf[2] = start of string (Unicode)
if (arbBuf.Length >= 4)
{
return(Encoding.Unicode.GetString(arbBuf, 2, arbBuf[0] - 2));
}
}
return(string.Empty);
}
private void btnXfer_Click(object sender, EventArgs e)
{
byte bmRequestType;
byte bRequest;
byte idPipe;
ushort wValue;
ushort wIndex;
ushort wLength;
byte[] arbData;
PipeStream pipe;
EndpointItem item;
int cbRead;
try
{
item = (EndpointItem)drpEndpoint.SelectedItem;
if (item.PipeId == -1)
{
// Control transfer
bmRequestType = ReadHexByte(txtType);
bRequest = ReadHexByte(txtRequest);
wValue = ReadHexWord(txtValue);
wIndex = ReadHexWord(txtIndex);
if (radIn.Checked)
{
wLength = ReadInt(txtLength);
arbData = m_Device.ControlRead(bmRequestType, bRequest, wValue, wIndex, wLength);
// Check for the case of getting a string descriptor
bmRequestType |= 0x80;
wValue >>= 8;
if (bmRequestType == 0x80 && bRequest == 6 && wValue == 3 && arbData.Length > 2)
{
string str = Encoding.Unicode.GetString(arbData, 2, arbData.Length - 2);
LogMsg(str, MsgType.MSG_In);
}
else
{
LogData(arbData, arbData.Length, MsgType.MSG_In);
}
}
else
{
arbData = ReadOutData();
wLength = (ushort)arbData.Length;
m_Device.ControlWrite(bmRequestType, bRequest, wValue, wIndex, arbData);
LogData(arbData, arbData.Length, MsgType.MSG_Out);
}
}
else
{
// bulk data transfer
idPipe = (byte)item.PipeId;
pipe = m_Device.PipeStreams[idPipe];
if (radIn.Checked)
{
wLength = ReadInt(txtLength);
arbData = new byte[wLength];
if (wLength == 1)
{
// Test ReadByte()
cbRead = pipe.ReadByte();
if (cbRead == -1)
{
cbRead = 0;
}
else
{
arbData[0] = (byte)cbRead;
cbRead = 1;
}
}
else
{
cbRead = pipe.Read(arbData, 0, arbData.Length);
}
LogData(arbData, cbRead, MsgType.MSG_In);
}
else
{
arbData = ReadOutData();
if (arbData.Length == 1)
{
pipe.WriteByte(arbData[0]);
}
else
{
pipe.Write(arbData, 0, arbData.Length);
}
LogData(arbData, arbData.Length, MsgType.MSG_Out);
}
}
}
catch (Exception exc)
{
LogMsg(exc.Message, MsgType.MSG_Info);
return;
}
}