//original code location:
//http://www.developersdex.com/vb/message.asp?p=2916&ID=%3C68D1F07B-ECB0-4A15-AFCA-2A911FC3234C%40microsoft.com%3E
public static void Get(out string manufacturer, out string model, out string revision, out string serialNumber, out string subsciberId)
{
IntPtr hLine;
int dwNumDev;
int num1 = 0x20000;
var lineInitializeParams = new LINEINITIALIZEEXPARAMS();
lineInitializeParams.dwTotalSize = (uint)Marshal.SizeOf(lineInitializeParams);
lineInitializeParams.dwNeededSize = lineInitializeParams.dwTotalSize;
lineInitializeParams.dwOptions = 2;
lineInitializeParams.hEvent = IntPtr.Zero;
lineInitializeParams.hCompletionPort = IntPtr.Zero;
#region lineInitializeEx
int result = Tapi.lineInitializeEx(out hLine, IntPtr.Zero,
IntPtr.Zero, null, out dwNumDev, ref num1, ref lineInitializeParams);
if (result != 0)
{
throw new ApplicationException(string.Format("lineInitializeEx failed!\n\nError Code:{0}", result));
}
#endregion
#region lineNegotiateAPIVerison
int version;
const int dwAPIVersionLow = 0x10004;
const int dwAPIVersionHigh = 0x20000;
LINEEXTENSIONID lineExtensionID;
result = Tapi.lineNegotiateAPIVersion(hLine, 0, dwAPIVersionLow, dwAPIVersionHigh, out version, out lineExtensionID);
if (result != 0)
{
throw new ApplicationException(string.Format("lineNegotiateAPIVersion failed!\n\nError Code: {0}", result));
}
#endregion
#region lineOpen
IntPtr hLine2;
result = Tapi.lineOpen(hLine, 0, out hLine2, version, 0, IntPtr.Zero, 0x00000002, 0x00000004, IntPtr.Zero);
if (result != 0)
{
throw new ApplicationException(string.Format("lineNegotiateAPIVersion failed!\n\nError Code: {0}", result));
}
#endregion
#region lineGetGeneralInfo
var structSize = Marshal.SizeOf(new LINEGENERALINFO());
var bytes = new byte[structSize];
var tmpBytes = BitConverter.GetBytes(structSize);
for (int index = 0; index < tmpBytes.Length; index++)
{
bytes[index] = tmpBytes[index];
}
#endregion
#region make initial query to retrieve necessary size
Tapi.lineGetGeneralInfo(hLine2, bytes);
// get the needed size
var neededSize = BitConverter.ToInt32(bytes, 4);
// resize the array
bytes = new byte[neededSize];
// write out the new allocated size to the byte stream
tmpBytes = BitConverter.GetBytes(neededSize);
for (int index = 0; index < tmpBytes.Length; index++)
{
bytes[index] = tmpBytes[index];
}
// fetch the information with properly size buffer
result = Tapi.lineGetGeneralInfo(hLine2, bytes);
if (result != 0)
{
throw new ApplicationException(Marshal.GetLastWin32Error().ToString());
}
#endregion
#region actual data fetching
// manufacture
var size = BitConverter.ToInt32(bytes, 12);
var offset = BitConverter.ToInt32(bytes, 16);
manufacturer = Encoding.Unicode.GetString(bytes, offset, size);
manufacturer = manufacturer.Substring(0, manufacturer.IndexOf('\0'));
// model
size = BitConverter.ToInt32(bytes, 20);
offset = BitConverter.ToInt32(bytes, 24);
model = Encoding.Unicode.GetString(bytes, offset, size);
model = model.Substring(0, model.IndexOf('\0'));
// revision
size = BitConverter.ToInt32(bytes, 28);
offset = BitConverter.ToInt32(bytes, 32);
revision = Encoding.Unicode.GetString(bytes, offset, size);
revision = revision.Substring(0, revision.IndexOf('\0'));
// serial number
size = BitConverter.ToInt32(bytes, 36);
offset = BitConverter.ToInt32(bytes, 40);
serialNumber = Encoding.Unicode.GetString(bytes, offset, size);
serialNumber = serialNumber.Substring(0, serialNumber.IndexOf('\0'));
// subscriber id
size = BitConverter.ToInt32(bytes, 44);
offset = BitConverter.ToInt32(bytes, 48);
subsciberId = Encoding.Unicode.GetString(bytes, offset, size);
subsciberId = subsciberId.Substring(0, subsciberId.IndexOf('\0'));
#endregion
//tear down
Tapi.lineClose(hLine2);
Tapi.lineShutdown(hLine);
}
public static extern int lineInitializeEx(out IntPtr lpm_hLineApp, IntPtr hInstance, IntPtr lpfnCallback, string lpszFriendlyAppName, out int lpdwNumDevs, ref int lpdwAPIVersion, ref LINEINITIALIZEEXPARAMS lpLineInitializeExParams);