Кто-нибудь может кинуть мне пример программирования COM портов

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»»» Rukhimovich Oleg - rukhiich@hotmail.com (06.06.00 20:23)
Если нужны подробности, пишите.

unit TestRosh;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    Label1: TLabel;
  PortCombo: TComboBox;
    Label2: TLabel;
    BaudCombo: TComboBox;
    Label3: TLabel;
    ByteSizeCombo: TComboBox;
    Label4: TLabel;
    ParityCombo: TComboBox;
  Label5: TLabel;
    StopBitsCombo: TComboBox;
    Label6: TLabel;
    Memo1: TMemo;
    Edit1: TEdit;
  Button1: TButton;
    Memo2: TMemo;
    Edit2: TEdit;
    Label7: TLabel;
    Button2: TButton;
    Label8: TLabel;
    Edit3: TEdit;
    procedure Button1Click(Sender: TObject);

   procedure Memo2Change(Sender: TObject);
    procedure Memo1Change(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure PortComboChange(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure Memo1DblClick(Sender: TObject);
    end;

var
    Form1: TForm1;

implementation

{$R *.DFM}

uses Registry;

var
    hPort: THandle;

procedure TForm1.Memo1Change(Sender: TObject);
var
    i: Integer;
begin
    Edit1.Text := '';
    for i := 1 to Length(Memo1.Text) do
  Edit1.Text := Edit1.Text + Format('%x', [Ord(Memo1.Text[i])]) + ' '
end;

procedure
TForm1.Memo2Change(Sender: TObject);
var
    i: Integer;
begin
    Edit2.Text := '';
    for i := 1 to Length(Memo2.Text) do
  Edit2.Text := Edit2.Text + Format('%x', [Ord(Memo2.Text[i])]) + ' '
end;

procedure TForm1.Button1Click(Sender: TObject);
var
    S, D: array[0..127] of Char;
    actual_bytes: Integer;
    DCB: TDCB;
begin

    FillChar(S, 128, #0);
    FillChar(D, 128, #0);

    DCB.DCBlength := SizeOf(DCB);

    if not GetCommState(hPort, DCB) then begin
  ShowMessage('Can''t get port state: ' + IntToStr(GetLastError));
  Exit;
    end;

    try
  DCB.BaudRate := StrToInt(BaudCombo.Text);
  
 except
  BaudCombo.Text := IntToStr(DCB.BaudRate);
    end;

    try
  DCB.ByteSize := StrToInt(ByteSizeCombo.Text);
    except
  ByteSizeCombo.Text := IntToStr(DCB.ByteSize);
    end;

    if ParityCombo.ItemIndex > -1 then
  DCB.Parity := ParityCombo.ItemIndex
    else
  ParityCombo.ItemIndex := DCB.Parity;

    if StopBitsCombo.ItemIndex > -1 then
  DCB.StopBits := StopBitsCombo.ItemIndex
    else
  StopBitsCombo.ItemIndex := DCB.StopBits;

    if not SetCommState(hPort, DCB) then begin
  ShowMessage('Can''t set new port settings: ' + IntToStr(GetLastError));
  Exit;
    end;

  PurgeComm(hPort, PURGE_TXABORT or PURGE_RXABORT
or PURGE_TXCLEAR or PURGE_RXCLEAR);

    StrPCopy(S, Memo1.Text);

    if not WriteFile(hPort, S, StrLen(S), actual_bytes, nil) then begin
  ShowMessage('Can''t write to port: ' + IntToStr(GetLastError));
  Exit;
    end;

    if not ReadFile(hPort, D, StrToInt(Edit3.Text), actual_bytes, nil) then
  ShowMessage('Can''t read from port: ' + IntToStr(GetLastError))
    else
  ShowMessage('Read ' + IntToStr(actual_bytes) + ' bytes');
    Memo2.Text := D;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
    with TRegistry.Create do begin
  OpenKey('\Software\MBEM\Rosh Shkila', True);
  WriteString('Port', PortCombo.Text);
  WriteString('Baud Rate', BaudCombo.Text);
 
WriteString('Byte Size', ByteSizeCombo.Text);
  WriteString('Parity', IntToStr(ParityCombo.ItemIndex));
  WriteString('Stop Bits', IntToStr(StopBitsCombo.ItemIndex));
  Destroy;
    end;
    if not CloseHandle(hPort) then begin
  ShowMessage('Can''t close port: ' + IntToStr(GetLastError));
  Exit;
    end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
    hPort := CreateFile(PChar(PortCombo.Text),
              GENERIC_READ + GENERIC_WRITE,
              0,
              nil,
              OPEN_EXISTING,
              FILE_ATTRIBUTE_NORMAL,
              0);

    if hPort = INVALID_HANDLE_VALUE then
  ShowMessage('Can''t open ' + PortCombo.Text
+ ': ' + IntToStr(GetLastError))
    else
  Button2.Hide;
end;

procedure TForm1.PortComboChange(Sender: TObject);
begin
    FormDestroy(Sender);
    Button2.Show;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
    with TRegistry.Create do begin
  OpenKey('\Software\MBEM\Rosh Shkila', True);
  PortCombo.Text := ReadString('Port');
  BaudCombo.Text := ReadString('Baud Rate');
  ByteSizeCombo.Text := ReadString('Byte Size');
  ParityCombo.ItemIndex := StrToInt(ReadString('Parity'));
  StopBitsCombo.ItemIndex := StrToInt(ReadString('Stop Bits'));
  Destroy;
    end;
end;

procedure TForm1.Memo1DblClick(Sender: TObject);
begin
    Memo1.Lines.Clear;
  
 Memo2.Lines.Clear;
    Edit1.Text := '';
    Edit2.Text := '';
end;

end.

»»» peter - ppp_extr@chat.ru (03.07.00 09:05)
Пример вывода текста на печать используя ком порт

Var
  Printer: THandle;
  N      : Cardinal;
  C      : POverlapped;

begin
//Открываем порт принтера для записи
Printer := CreateFile(PChar('LPT1'),
           GENERIC_READ or GENERIC_WRITE,0,nil,
           OPEN_EXISTING,FILE_FLAG_OVERLAPPED,0);

//Печатаем слово 'Hello World';
WriteFile(Printer,'Hello World',11,N,c);
//Закрываем порт
CloseHandle(Printer);

-= Из конференции сайта MASTERS OF DELPHI (http://delphi.mastak.com) =-

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