unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    rdCOM: TRadioGroup;
    btnOpenPort: TButton;
    btnEnd: TButton;
    btnSend: TButton;
    btnReceive: TButton;
    mSend: TMemo;
    mReceive: TMemo;
    procedure btnOpenPortClick(Sender: TObject);
    procedure btnEndClick(Sender: TObject);
    procedure btnSendClick(Sender: TObject);
    procedure btnReceiveClick(Sender: TObject);
  private

  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  DTRMode,RTSMode,Port:Integer;
  Function PortSet():Boolean;
implementation
 uses PComm,MxTool,EXGLOBAL; //PCOmm引用聲明放于此
{$R *.DFM}

//以下是打開(kāi)通信端口的程序
procedure TForm1.btnOpenPortClick(Sender: TObject);
var
 Ret:Integer;
begin
 //打開(kāi)通信端口
 Port := rdCom.ItemIndex+1;  //指定通信端口
 Ret := sio_Open(Port);
  If ret <> SIO_OK Then
   begin
     ShowMessage('打開(kāi)通信端口錯(cuò)誤');
     sio_close (Port);
     Exit;
   end;
   If Not PortSet() Then   //參數(shù)設(shè)置
   begin
     sio_close(Port);
     ShowMessage('通信端口參數(shù)設(shè)置發(fā)生錯(cuò)誤');
     Exit;
   End;
    //降低DTR及RTS的電壓
    ret := sio_DTR(Port, 0);
    ret := sio_RTS(Port, 0);
end;


//以下是結(jié)束按鈕的動(dòng)作
procedure TForm1.btnEndClick(Sender: TObject);
begin
   //關(guān)閉通信端口
   sio_Close(Port);
   //結(jié)束程序
   close;
end;

procedure TForm1.btnSendClick(Sender: TObject);
var
 TxtStr:String;
begin
    //輸出字符串指定
    TxtStr := mSend.Text;
    //把Pascal字符串轉(zhuǎn)成C字符串后送出
    sio_write(Port, PChar(TxtStr), Length(TxtStr))
end;

procedure TForm1.btnReceiveClick(Sender: TObject);
var
  rLen:LongInt;
  PBuf:PChar;
  Buf:String;
begin
  //給一個(gè)空間存數(shù)據(jù)，一定要有
  PBuf := PChar(StringOfChar(' ',1024));
  rlen := sio_read(Port,PBuf , 1024); //讀取數(shù)據(jù)
  If rlen = 0 Then Exit; //若無(wú)數(shù)據(jù)則跳出
  Buf := StrPas(PBuf);
  Buf := Copy(Buf,1,rlen);
  //將數(shù)據(jù)顯示在Memo中
  mReceive.Text := mReceive.Text + Buf;
  mReceive.SelStart := Length(mReceive.Text);
  mReceive.SelLength := 0;
end;

//以下是通信參數(shù)的函數(shù)實(shí)現(xiàn)
Function PortSet():Boolean;
var
   mode,Hw,Sw,ret:LongInt;
begin
//參數(shù)設(shè)置子程序
    mode := P_NONE Or BIT_8 Or STOP_1;
    Hw := 0 ;   //沒(méi)有硬件流量控制
    Sw := 0 ;  //沒(méi)有軟件流量控制
    Result := False ;
    ret := sio_ioctl(Port, B38400, mode); //Setting
    If ret <> SIO_OK Then
     begin
        ShowMessage('設(shè)置時(shí)發(fā)生錯(cuò)誤');
        Exit;
     end;
    ret := sio_flowctrl(Port, Hw or Sw); //Flow Control
    If ret <> SIO_OK Then
      begin
        ShowMessage('流量設(shè)置時(shí)發(fā)生錯(cuò)誤');
        Exit;
      end;
    Result := True;
End;
end.