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Unit_main.pas
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Unit_main.pas
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unit Unit_main;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs,
Vcl.StdCtrls, Vcl.ExtCtrls;
const BUFFER_LENGTH = 14; // Ðàçìåð áóôåðà äëÿ ðàáîòû ñ COM-ïîðòîì
type ARR_BYTE = array [1 .. BUFFER_LENGTH] of byte; // Òèï áóôåðà äëÿ ðàáîòû ñ COM-ïîðòîì
type
TForm1 = class(TForm)
Button_ConnectOn: TButton;
Timer_Reader: TTimer;
Memo_Data: TMemo;
Button_ConnectOff: TButton;
Timer_Writer: TTimer;
CheckBox_R: TCheckBox;
CheckBox_W: TCheckBox;
procedure Button_ConnectOnClick(Sender: TObject);
procedure Timer_ReaderTimer(Sender: TObject);
procedure Button_ConnectOffClick(Sender: TObject);
function ConvertArrByteToStr(arr: array of byte; len: integer): shortstring;
function ConvertStrToArrByte(st: shortstring): ARR_BYTE;
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure Timer_WriterTimer(Sender: TObject);
function InitPort(var h: Thandle; cport: string; access: dword): boolean;
procedure ClosePort(var h: Thandle);
private
{ Private declarations }
public
{ Public declarations }
end;
const
COM_PORT_WRITE = 'COM6'; // Èìÿ COM-ïîðòà äëÿ çàïèñè
COM_PORT_READ = 'COM7'; // Èìÿ COM-ïîðòà äëÿ ÷òåíèÿ
FDCB: dcb = (BaudRate: 9600; ByteSize: 8; Parity: NOPARITY;
Stopbits: TWOSTOPBITS); // Íàñòðîéêè ñîåäèíåíèÿ
TOUT: CommTimeouts = (ReadIntervalTimeout: 15; ReadTotalTimeoutConstant: 70;
WriteTotalTimeoutMultiplier: 15; WriteTotalTimeoutConstant: 60); // Òàéìàóòû ñâÿçè
var
Form1: TForm1;
h_W: Thandle = 0; // Õýíäë COM-ïîðòà äëÿ çàïèñè
h_R: Thandle = 0; // Õýíäë COM-ïîðòà äëÿ ÷òåíèÿ
bufferR: ARR_BYTE; // Áóôåð äëÿ ïðèåìà äàííûõ
bufferW: ARR_BYTE; // Áóôåð äëÿ ïåðåäà÷è äàííûõ
implementation
{$R *.dfm}
function TForm1.InitPort(var h: Thandle; cport: string; access: dword): boolean;
// Èíèöèàëèçàöèÿ ïîäêëþ÷åíèÿ ê COM-ïîðòó
var port: string; err_code: integer;
begin
port := '\\.\' + cport; InitPort := false;
if h <> 0 then Closehandle(h);
h := CreateFile(Pchar(port), access, 0, Nil, OPEN_EXISTING, 0, 0);
SetCommState(h, FDCB); SetCommTimeouts(h, TOUT);
if h = high(h) then begin
Closehandle(h); err_code := GetLastError;
case err_code of
5: begin
MessageDlg('Ê ïîðòó ' + cport + ' äîñòóï çàïðåùåí.' + #13#10 +
'Äåñêðèïòîð ïîðòà=' + InttoStr(h), mtError, [mbOK], 0);
end;
6: begin
MessageDlg('Ïîðò ' + cport +
' íå ñóùåñòâóåò èëè çàíÿò äðóãîé ïðîãðàììîé.' + #13#10 +
'Äåñêðèïòîð ïîðòà=' + InttoStr(h), mtError, [mbOK], 0);
end;
end;
end else InitPort :=true;
end;
procedure TForm1.ClosePort(var h: Thandle);
// Îòêêëþ÷åíèå îò COM-ïîðòà
begin
if h <> 0 then begin
PurgeComm(h, PURGE_TXABORT or PURGE_RXABORT or PURGE_TXCLEAR or PURGE_RXCLEAR);
Closehandle(h); h := 0;
end;
end;
procedure TForm1.Button_ConnectOnClick(Sender: TObject);
// Ïîäêëþ÷åíèå ê COM-ïîðòàì
begin
Memo_Data.Lines.Clear;
if CheckBox_R.Checked then
if InitPort(h_R, COM_PORT_READ, GENERIC_READ) then Timer_Reader.Enabled := true;
if CheckBox_W.Checked then
if InitPort(h_W, COM_PORT_WRITE, GENERIC_WRITE) then Timer_Writer.Enabled := true;
CheckBox_R.Enabled:=false; CheckBox_W.Enabled:=false;
end;
function TForm1.ConvertArrByteToStr(arr: array of byte; len: integer): shortstring;
// Ôóíêöèÿ ïðåîáðàçîâàíèÿ ìàññèâà áàéò â ñòðîêó
var i: integer; s: shortstring;
begin
s := '';
for i := 0 to len - 1 do s := s + ansichar(arr[i]);
result := s;
end;
function TForm1.ConvertStrToArrByte(st: shortstring): ARR_BYTE;
// Ôóíêöèÿ ïðåîáðàçîâàíèÿ ñòðîêè â ìàññèâ áàéò
var arr: ARR_BYTE; i: integer;
begin
for i := 1 to BUFFER_LENGTH do
if i<=length(st) then arr[i] := ord(st[i]) else arr[i] := ord(' ');
result := arr;
end;
procedure TForm1.Timer_ReaderTimer(Sender: TObject);
// ×òåíèå äàííûõ ñ COM-ïîðòà
var bytesReceived: cardinal; messageR: shortstring;
begin
PurgeComm(h_R, PURGE_RXABORT or PURGE_RXCLEAR);
ReadFile(h_R, bufferR, BUFFER_LENGTH, bytesReceived, nil);
messageR := trim(ConvertArrByteToStr(bufferR, bytesReceived));
if (bytesReceived = BUFFER_LENGTH) then
Memo_Data.Lines.Add('Ïîëó÷åíû äàííûå: ' + messageR)
else
Memo_Data.Lines.Add('îæèäàíèå äàííûõ ...');
Application.ProcessMessages;
end;
procedure TForm1.Timer_WriterTimer(Sender: TObject);
// Çàïèñü äàííûõ â COM-ïîðò
var bytesTransmitted: cardinal; messageW: shortstring;
begin
PurgeComm(h_W, PURGE_TXABORT or PURGE_TXCLEAR);
EscapeCommFunction(h_W, SETRTS);
messageW := 'Ïðèâåò, âñåì !';
bufferW := ConvertStrToArrByte(messageW);
WriteFile(h_W, bufferW, BUFFER_LENGTH, bytesTransmitted, nil);
sleep(20);
EscapeCommFunction(h_W, CLRRTS);
Memo_Data.Lines.Add('Çàïèñàíû äàííûå: ' + ConvertArrByteToStr(bufferW, BUFFER_LENGTH));
Application.ProcessMessages;
end;
procedure TForm1.Button_ConnectOffClick(Sender: TObject);
// Îòêëþ÷åíèå îò COM-ïîðòîâ
begin
Timer_Reader.Enabled := false; Timer_Writer.Enabled := false;
Memo_Data.Clear; ClosePort(h_R); ClosePort(h_W);
CheckBox_R.Enabled:=true; CheckBox_W.Enabled:=true;
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
// Âûõîä èç ïðîãðàììû
begin
Button_ConnectOffClick(Sender);
end;
end.