C# Definition:

[StructLayout( LayoutKind.Sequential )] struct COMMCONFIG
   UInt32 dwSize;
   UInt16 wVersion;
   UInt16 wReserved;
   DCB dcb;
   UInt32 dwProviderSubType;
   UInt32 dwProviderOffsert;
   UInt32 dwProviderSize;
   Byte wcProviderDate;
}

VB Definition:

Please Edit.

User-Defined Field Types:

// dwProviderSubType
const UInt32 PST_FAX        = 0x00000021; // FAX device
const UInt32 PST_LAT        = 0x00000101; // LAT protocol
const UInt32 PST_MODEM      = 0x00000006; // Modem device
const UInt32 PST_NETWORK_BRIDGE = 0x00000100; // Unspecified network bridge
const UInt32 PST_PARALLELPORT   = 0x00000002; // Parallel port
const UInt32 PST_RS232      = 0x00000001; // RS-232 serial port
const UInt32 PST_RS422      = 0x00000003; // RS-422 port
const UInt32 PST_RS423      = 0x00000004; // RS-423 port
const UInt32 PST_RS449      = 0x00000005; // RS-449 port
const UInt32 PST_SCANNER    = 0x00000022; // Scanner device
const UInt32 PST_TCPIP_TELNET   = 0x00000102; // TCP/IP Telnet protocol
const UInt32 PST_UNSPECIFIED    = 0x00000000; // Unspecified
const UInt32 PST_X25        = 0x00000103; // X.25 standards

// dwProvCapabilities
const UInt32 PCF_16BITMODE     = 0x0200; // Special 16-bit mode supported
const UInt32 PCF_DTRDSR    = 0x0001; // DTR (data-terminal-ready)/DSR (data-set-ready) supported
const UInt32 PCF_INTTIMEOUTS   = 0x0080; // Interval time-outs supported
const UInt32 PCF_PARITY_CHECK  = 0x0008; // Parity checking supported
const UInt32 PCF_RLSD      = 0x0004; // RLSD (receive-line-signal-detect) supported
const UInt32 PCF_RTSCTS    = 0x0002; // RTS (request-to-send)/CTS (clear-to-send) supported
const UInt32 PCF_SETXCHAR      = 0x0020; // Settable XON/XOFF supported
const UInt32 PCF_SPECIALCHARS  = 0x0100; // Special character support provided
const UInt32 PCF_TOTALTIMEOUTS = 0x0040; // Total (elapsed) time-outs supported
const UInt32 PCF_XONXOFF       = 0x0010; // XON/XOFF flow control supported

// dwMaxBaud
const UInt32  BAUD_075    = 0x00000001; // 75 bps
const UInt32  BAUD_110    = 0x00000002; // 110 bps
const UInt32  BAUD_134_5  = 0x00000004; // 134.5 bps
const UInt32  BAUD_150    = 0x00000008; // 150 bps
const UInt32  BAUD_300    = 0x00000010; // 300 bps
const UInt32  BAUD_600    = 0x00000020; // 600 bps
const UInt32  BAUD_1200   = 0x00000040; // 1200 bps
const UInt32  BAUD_1800   = 0x00000080; // 1800 bps
const UInt32  BAUD_2400   = 0x00000100; // 2400 bps
const UInt32  BAUD_4800   = 0x00000200; // 4800 bps
const UInt32  BAUD_7200   = 0x00000400; // 7200 bps
const UInt32  BAUD_9600   = 0x00000800; // 9600 bps
const UInt32  BAUD_14400  = 0x00001000; // 14400 bps
const UInt32  BAUD_19200  = 0x00002000; // 19200 bps
const UInt32  BAUD_38400  = 0x00004000; // 38400 bps
const UInt32  BAUD_56K    = 0x00008000; // 56K bps
const UInt32  BAUD_57600  = 0x00010000; // 57600 bps
const UInt32  BAUD_115200 = 0x00020000; // 115200 bps
const UInt32  BAUD_128K   = 0x00040000; // 128K bps
const UInt32  BAUD_USER   = 0x10000000; // Programmable baud rate.

Notes:

None.

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