unitcommset.pas

delphi基于工业控制的串口通讯

//******************************************************************************
//*单元名称：UnitCommSet                                                       *
//*单元功能：串口设置以及串口可以个数的获得                                    *
//*具体描述：                                                                  *
//*开发作者：张志华                                                            *
//*电子邮件：E-mail(MSN):[e-mail]; QQ:29763034 TEL:[phone]           *
//*开发日期：2004-10-11                                                        *
//*使用方法：                                                                  *
//*属    性：                                                                  *
//*修改日期：                                                                  *
//******************************************************************************
unit UnitCommSet;

interface

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

type
  Tfrm_CommSet = class(TForm)
    Cmd_NO: TSpeedButton;
    Cmd_Ok: TSpeedButton;
    ComboBox2: TComboBox;
    Edit_BaudRate: TLabeledEdit;
    Edit_CommName: TComboBox;
    Label1: TLabel;
    Label2: TLabel;
    Panel1: TPanel;
    procedure Cmd_OkClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    procedure GetAvailableComPorts;
  end;
  
var
  frm_CommSet: Tfrm_CommSet;

implementation

{$R *.dfm}
//获取当前串口
{
********************************* Tfrm_CommSet *********************************
}
procedure Tfrm_CommSet.Cmd_OkClick(Sender: TObject);
var
  f: TIniFile;
begin
  f:=TIniFile.Create(ExtractFileDir(application.Exename)+'\SystemSet.ini');
  f.WriteString('CommSeting','CommName',Trim(Edit_CommName.Text)); //服务端口号
  f.WriteString('CommSeting','BaudRate',Trim(Edit_BaudRate.Text)); //服务端口号
  Application.MessageBox('系统提示！','串口设置成功！',MB_ICONERROR+MB_OK);
  f.Free;
  system.Halt;
end;

procedure Tfrm_CommSet.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Action:=Cafree;;
  system.Halt;
end;

procedure Tfrm_CommSet.FormCreate(Sender: TObject);
begin
  GetAvailableComPorts; //获取当前串口
end;

procedure Tfrm_CommSet.GetAvailableComPorts;
var
  i: Integer;
  S: string;
  ComName: array[0..9] of Char;
  TheComHandle: Integer;
begin
  (*** Okay, Clear everything in the PortsComboBox because
  ** we want to start off fresh.
  *)
  Edit_CommName.Clear();
  (*
  ** Windows 95/98 can only handle up to 50 COM ports.
  ** All we are doing here is checking to see if Windows
  ** "can" open up the COM port.  If so, then we know it's
  ** available.  And so we add it to our ComboBox list
  ** and of course close the COM port each time we check it.
  *)
  for i := 1 to 50 do
  begin
      StrFmt(ComName, '\\.\COM%d', [i]);
      TheComHandle := CreateFile
      (
      ComName, // name
      GENERIC_READ or GENERIC_WRITE, // access attributes
      0, // no sharing
      nil, // no security
      OPEN_EXISTING, // creation action
      FILE_ATTRIBUTE_NORMAL or
      FILE_FLAG_OVERLAPPED, // attributes
      0 // no template
      );
      if (DWORD(TheComHandle) <> INVALID_HANDLE_VALUE) then
      begin
          S := Format('COM%d', [i]);
          Edit_CommName.Items.Add(S);
      end;
      CloseHandle(TheComHandle);
  end; {end of for loop}
end;



end.