БЭМЗ полищук доки / Comp / examples / delphi / BarCodeScaner

unit BarCodeScaner;
{$I CPort.inc}

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
CPort;

type
TBarCodeEvent = procedure (var BarCode: String) of Object;

TBarCodeScaner = class(TCustomComPort)
private
FOnBarCode: TBarCodeEvent;
FTempStr: String;
FTermChar: Char;
protected
procedure DoAfterOpen; override;
procedure DoError(Errors: TComErrors); override;
procedure DoRxChar(Count: Integer); override;
public
constructor Create(AOwner: TComponent); override;
published
property Connected;
property BaudRate;
property Port;
property Parity;
property StopBits;
property DataBits;
property DiscardNull;
property EventChar;
property Events;
property Buffer;
property FlowControl;
property Timeouts;
property SyncMethod;
{ property OnAfterOpen;
property OnAfterClose;
property OnBeforeOpen;
property OnBeforeClose;
property OnRxChar;
property OnRxBuf;
property OnTxEmpty;
property OnBreak;
property OnRing;
property OnCTSChange;
property OnDSRChange;
property OnRLSDChange;
property OnRxFlag;
property OnError;
property OnRx80Full;}
property TermChar: Char read FTermChar write FTermChar default #0;
property OnBarCode: TBarCodeEvent read FOnBarCode write FOnBarCode;
end;

procedure Register;

implementation

uses CPortReg, DsgnIntf;

procedure Register;
begin
RegisterComponents('CPortLib', [TBarCodeScaner]);
RegisterComponentEditor(TBarCodeScaner, TComPortEditor);
end;

constructor TBarCodeScaner.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FTermChar := #0;
end;

procedure TBarCodeScaner.DoAfterOpen;
begin
inherited DoAfterOpen;
FTempStr := '';
end;

procedure TBarCodeScaner.DoRxChar(Count: Integer);
var
Str: String;
CurPos : Integer;
begin
inherited DoRxChar(Count);
if not Assigned(FOnBarCode) then Exit;
ReadStr(Str, Count);
CurPos := Pos( FTermChar ,Str);
if CurPos = 0 then begin
FTempStr := FTempStr + Str;
end
else begin
FTempStr := FTempStr + Copy( Str, 1, CurPos-1);
FOnBarCode(FTempStr);
FTempStr := '';
end;
end;

procedure TBarCodeScaner.DoError(Errors: TComErrors);
begin
// Application.ProcessMessages;
if Errors = [] then Exit;
inherited DoError(Errors);
if ceFrame in Errors then
Application.MessageBox('The hardware detected a framing error.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceOverrun in Errors then
Application.MessageBox('A charachter buffer overrun has occured.'+#13+'The next charachter is lost.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceRxParity in Errors then
Application.MessageBox('The hardware detected a parity error.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceBreak in Errors then
Application.MessageBox('The hardware detected a break condition.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceIO in Errors then
Application.MessageBox('An I/O error occured during communication with the device.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceMode in Errors then
Application.MessageBox('The requested mode is not supported.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceRxOver in Errors then
Application.MessageBox('An input buffer overflow has occured.', 'Ошибка', MB_ICONERROR+MB_OK);
if ceTxFull in Errors then
Application.MessageBox('The output buffer is full.', 'Ошибка', MB_ICONERROR+MB_OK);
end;

end.