【例子介绍】
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【源码结构】
unit uPublic; interface uses SysUtils,Dialogs,Types,Graphics,forms,Windows, Classes,Variants; type TPortInfo=record //串口信息 iPort:Integer; iBaud:Integer; iDataBit:Integer; sParity:String; iStopBit:Integer; end; Function HexToInt(Hex : string) : Integer; Function LRC(str :String) :String; procedure OpenPort(rPort:TPortInfo); //打开串口 procedure SendData(iPort:Integer;sData:String); Function ReadFromPort(iPort:integer):String; Function ReadResFromPort(iPort:integer):String; implementation uses PComm; procedure OpenPort(rPort:TPortInfo); //打开串口 var ret:Integer; _iBaud,_iStop,_iData:Integer; _iPort,_iParity:Integer; begin _iPort:=rPort.iPort; sio_close(_iPort); //打开之前先关闭 ret := sio_open(_iPort); if ( ret <> SIO_OK ) then begin //MessageBox(Handle, PChar('打开端口失败!'), PChar('警告'), MB_ICONERROR or MB_OK); MessageDlg(#13#10'打开端口失败!', mtWarning,[mbOK], 0); end; case rPort.iBaud of 921600: _iBaud:=B921600; 460800: _iBaud:=B460800; 230400: _iBaud:=B230400; 115200: _iBaud:=B115200; 57600: _iBaud:=B57600; 38400: _iBaud:=B38400; 19200: _iBaud:=B19200; 9600: _iBaud:=B9600; 4800: _iBaud:=B4800; 2400: _iBaud:=B2400; 1800: _iBaud:=B1800; 1200: _iBaud:=B1200; 600: _iBaud:=B600; 300: _iBaud:=B300; end; case rPort.iDataBit of 8: _iData:=BIT_8; 7: _iData:=BIT_7; 6: _iData:=BIT_6; 5: _iData:=BIT_5; end; case rPort.iStopBit of 1: _iStop:=STOP_1; 2: _iStop:=STOP_2; end; _iParity:=0; if(rPort.sParity = '偶校验') then _iParity := 24; if(rPort.sParity = '奇校验') then _iParity := 8; if(rPort.sParity = '无') then _iParity := 0; if(rPort.sParity = '标记') then _iParity := 40; if(rPort.sParity = '空') then _iParity := 56; ret := sio_ioctl ( _iPort, _iBaud, _iParity or _iData or _iStop ); if (ret <> SIO_OK) then //MessageBox(Handle, PChar('串口设置参数失败!'), PChar('警告'), MB_ICONERROR or MB_OK); MessageDlg(#13#10'串口设置参数失败!', mtWarning,[mbOK], 0); end; Function HexToInt(Hex : string) : Integer; const cHex = '0123456789ABCDEF'; var mult,i,loop : integer; begin result := 0; mult := 1; for loop := length(Hex) downto 1 do begin i := pos(Hex[loop],cHex)-1; if (i < 0) then i := 0; inc(result,(i*mult)); mult := mult * 16; end; end; Function LRC(str :String) :String; var c,l:Integer; c_Data:String; d_lrc:integer; h_lrc:String; Begin c := 0; l := Length(str) div 2 ; d_lrc:=0; For c := 1 To l do Begin c_data := Copy(str, c*2-1, 2) ; d_lrc := d_lrc HexToInt(c_data); End; If d_lrc > 255 Then Begin d_lrc := d_lrc Mod 256; End; h_lrc := IntToHex(256 - d_lrc,4); If Length(h_lrc) > 2 Then Begin h_lrc := Copy(h_lrc, Length(h_lrc) - 1, 2) End; LRC := h_lrc; end; procedure SendData(iPort:Integer;sData:String); var buffer : Array[1..255] of char; i,iLen:Integer; sStr,sLRC:String; begin sLRC:=LRC(sData); sStr:=':' sData sLRC #13 #10; iLen:=length(sStr); if iLen>255 then Exit; for i:=1 to iLen do buffer[i]:=sStr[i]; sio_write(iPort,@buffer,iLen); end; Function ReadFromPort(iPort:integer):String; var iLen:integer; sSave:String; Begin sSave:=''; iLen:=sio_getch(iPort); while iLen>=0 do //包含Asc为0的字符 begin if iLen>=0 then begin sSave:=sSave Chr(iLen); end else Begin break; End; //sleep(50); iLen:=sio_getch(iPort); end; Result:=sSave; End; Function ReadResFromPort(iPort:integer):String; var iLen:integer; sSave:String; Begin sSave:=''; repeat iLen:=sio_getch(iPort); if iLen>=0 then begin sSave:=sSave Chr(iLen); end; if Length(sSave)>3 then Begin if Copy(sSave,length(sSave)-1,2)=#13#10 then Begin break; End; End; until false; Result:=sSave; End; end.
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