GetCommMask,SetCommMask:读取和设置串口上的事件掩码.
WaitCommEvent:根据SetCommMask设置的事件掩码,以阻塞的方式来等待事件的触发.
1 function GetCommMask(hFile: THandle; var lpEvtMask: DWORD): BOOL; stdcall;
2 function SetCommMask(hFile: THandle; dwEvtMask: DWORD): BOOL; stdcall;
3 function WaitCommEvent(hFile: THandle; var lpEvtMask: DWORD; lpOverlapped: POverlapped): BOOL; stdcall;
1 EV_RXCHAR = 1; { Any Character received }
2 EV_RXFLAG = 2; { Received certain character }
3 EV_TXEMPTY = 4; { Transmitt Queue Empty }
4 EV_CTS = 8; { CTS changed state }
5 EV_DSR = $10; { DSR changed state }
6 EV_RLSD = $20; { RLSD changed state }
7 EV_BREAK = $40; { BREAK received }
8 EV_ERR = $80; { Line status error occurred }
9 EV_RING = $100; { Ring signal detected }
10 EV_PERR = $200; { Printer error occured }
11 EV_RX80FULL = $400; { Receive buffer is 80 percent full }
12 EV_EVENT1 = $800; { Provider specific event 1 }
13 EV_EVENT2 = $1000; { Provider specific event 2 }
介个函数基本么用过..飘过...