typedef struct _DCB {
    DWORD DCBlength;      
    DWORD BaudRate;       
    DWORD fBinary: 1;     
    DWORD fParity: 1;     
    DWORD fOutxCtsFlow:1; 
    DWORD fOutxDsrFlow:1; 
    DWORD fDtrControl:2;  
    DWORD fDsrSensitivity:1; 
    DWORD fTXContinueOnXoff: 1; 
    DWORD fOutX: 1;       
    DWORD fInX: 1;        
    DWORD fErrorChar: 1;  
    DWORD fNull: 1;       
    DWORD fRtsControl:2;  
    DWORD fAbortOnError:1; 
    DWORD fDummy2:17;     
    WORD wReserved;       
    WORD XonLim;          
    WORD XoffLim;         
    BYTE ByteSize;        
    BYTE Parity;          
    BYTE StopBits;        
    char XonChar;         
    char XoffChar;        
    char ErrorChar;       
    char EofChar;         
    char EvtChar;         
    WORD wReserved1;      
} DCB, *LPDCB;