7.串口操作之API篇 GetCommMask SetCommMask WaitCommEvent

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...