typedef struct _COMMPROP {
    WORD wPacketLength;
    WORD wPacketVersion;
    DWORD dwServiceMask;
    DWORD dwReserved1;
    DWORD dwMaxTxQueue;
    DWORD dwMaxRxQueue;
    DWORD dwMaxBaud;
    DWORD dwProvSubType;
    DWORD dwProvCapabilities;
    DWORD dwSettableParams;
    DWORD dwSettableBaud;
    WORD wSettableData;
    WORD wSettableStopParity;
    DWORD dwCurrentTxQueue;
    DWORD dwCurrentRxQueue;
    DWORD dwProvSpec1;
    DWORD dwProvSpec2;
    WCHAR wcProvChar[1];
} COMMPROP,*LPCOMMPROP;