// Returns:
public const Int32 INVALID_PARAMETER = -1;  // Invalid parameter
public const Int32 NOT_CONNECTED = 0;  // Not connected (trying to connect)
public const CONNECTED = 1;  // Connected

// Method C#:
[DllImport(ApiDll, CallingConvention = CallingConvention.Cdecl)]
public static extern Int32 GetConnectionStatus(out UInt16 NodeNumber, out UInt8 BNumber, out UInt32 GatewayControlIpAddrOfNode, out UInt16 GatewayControlIpPortOfNode, out string NodeDescriptionString);

// Method C:
Int32 __cdecl GetConnectionStatus(UInt16  *NodeNumber, UInt8   *BNumber, UInt32  *GatewayControlIpAddrOfNode, UInt16  *GatewayControlIpPortOfNode,  char **NodeDescriptionString);