RS232 Schnittstelle Daten auslesen

[M.Schultheis]

Ja ... Nun habe ich mit dem Teufelszeug n bischen was getippert....

ne Type TMyThread erstellt ...
eine .execute ...


aber wo muss das ding nun rein ...
in die com unit oder in meine Form1

???

type
TMyThread = class(TThread)
private
{ Private-Deklarationen }
protected
procedure Execute; override;
end;
.
.
.
procedure TMyThread.Execute();
var c: char;
rx_buffer: string;
begin
if Port.GetChar(c)then
rx_buffer := rx_buffer + c;
form1.lstcontroller.items.add(rx_buffer);
end;
.
.
.

und hier das geistige eigentum von dem hernn müller ...
.
.
.

unit COM;

interface

uses
WinTypes, WinProcs, Classes, SysUtils;

type
TRTSMode = (RTS_DISABLED, RTS_ENABLED, RTS_HANDSHAKE, RTS_TOGGLE);
TDTRMode = (DTR_DISABLED, DTR_ENABLED, DTR_HANDSHAKE);
TParity = (NOPARITY, ODDPARITY, EVENPARITY, MARKPARITY, SPACEPARITY);
TStopbits = (ONESTOPBIT, ONE5STOPBITS, TWOSTOPBITS);
TCOM = class(TComponent)
private
FDCB: TDCB;
FHandle: Cardinal;
FTimeouts: TCommTimeouts;
FError: Cardinal;
FComNo: byte;
FBaud: word;
FParity: TParity;
FDatabits: byte;
FStopbits: TStopbits;

function GetRTS: boolean;
procedure SetRTS(const Value: boolean);
function GetDTR: boolean;
procedure SetDTR(const Value: boolean);
function GetDCD: boolean;
function GetDSR: boolean;
function GetRI: boolean;
function GetCTS: boolean;
function GetIsOpen: boolean;
function GetInBufUsed: cardinal;
function GetOutBufUsed: cardinal;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;

function TestComPortAvailable(ComNo: integer): boolean;
function Open(ComNo: integer; RTSMode: TRTSMode; DTRMode: TDTRMode): boolean;
function RxFlush: boolean;
function TxFlush: boolean;
function Send(Data: Char): boolean; overload;
function Send(Data: PChar; Len: cardinal): boolean; overload;
function GetChar(var data: Char): boolean;

procedure Close;
procedure Reset;
published
property ComNo: byte read FComNo;
property Baud: word read FBaud write FBaud;
property Databits: byte read FDatabits write FDatabits;
property Stopbits: TStopbits read FStopbits write FStopbits;
property Parity: TParity read FParity write FParity;
property IsOpen: boolean read GetIsOpen;
property InBufUsed: cardinal read GetInBufUsed;
property OutBufUsed: cardinal read GetOutBufUsed;
property Error: cardinal read FError;
property RTS: boolean read GetRTS write SetRTS;
property CTS: boolean read GetCTS;
property DTR: boolean read GetDTR write SetDTR;
property DSR: boolean read GetDSR;
property RI: boolean read GetRI;
property DCD: boolean read GetDCD;
end;

var FCOM: TCOM;

implementation


{----------------------------------------------------------------------------------------------}

constructor TCOM.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FHandle := INVALID_HANDLE_VALUE;

Baud := CBR_9600;
Databits := 8;
Parity := NOPARITY;
StopBits := ONESTOPBIT;
end;

{----------------------------------------------------------------------------------------------}

destructor TCOM.Destroy;
begin
if IsOpen then Close; { Port schließen falls geöffnet }
inherited destroy;
end;

{----------------------------------------------------------------------------------------------}

function TCOM.TestComPortAvailable(ComNo: integer): boolean;
begin
Result := Open(ComNo, RTS_DISABLED, DTR_DISABLED);
end;

{----------------------------------------------------------------------------------------------}

function TCOM.Open(ComNo: integer; RTSMode: TRTSMode; DTRMode: TDTRMode): boolean;
var init: string;
begin
if FHandle = INVALID_HANDLE_VALUE then
begin
init := '\\.\COM' + IntToStr(ComNo);
FHandle := CreateFile(@init[1],
GENERIC_READ or GENERIC_WRITE,
0, nil,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if FHandle <> INVALID_HANDLE_VALUE then
begin
FComNo := ComNo;
// aktuelle Einstellungen ermitteln
if GetCommState(FHandle, FDCB) then
begin
// rudimentäre Parameter setzen
FDCB.Baudrate := FBaud;
FDCB.Bytesize := Databits;
FDCB.Parity := Ord(FParity);
FDCB.Stopbits := Ord(FStopbits);

// RTS Modus setzen
FDCB.flags := FDCB.flags and $CFFB; {RTS aus}
case RTSMode of
RTS_ENABLED: FDCB.flags := FDCB.flags or $1000; {RTS ein}
RTS_HANDSHAKE: FDCB.flags := FDCB.flags or $2004; {RTS Handshake ein (gekoppelt an RX Buffer 0= Empfangspuffer zu 3/4 voll)}
RTS_TOGGLE: FDCB.flags := FDCB.flags or $3000; {RTS gekoppelt an Tx Buffer (1=Daten im Sendepuffer)}
end;
// DTR Modus setzen
FDCB.flags := FDCB.flags and $FFC7; {DTR aus (und bleibt aus)}
case DTRMode of
DTR_ENABLED: FDCB.flags := FDCB.flags or $0010; {DTR ein (und bleibt ein)}
DTR_HANDSHAKE: FDCB.flags := FDCB.flags or $0028; {DTR Handshake ein}
end;

if SetCommState(FHandle, FDCB) then
begin
if SetupComm(FHandle, 1024, 1024) then {Rx-/Tx-Buffer-Einstellungen}
begin
FTimeouts.ReadIntervalTimeout := 0; {Timeoutzeiten setzen}
FTimeouts.ReadTotalTimeoutMultiplier := 0;
FTimeouts.ReadTotalTimeoutConstant := 1;
FTimeouts.WriteTotalTimeoutMultiplier := 0;
FTimeouts.WriteTotalTimeoutConstant := 0;
SetCommTimeouts(FHandle, FTimeouts);
end;
end;
end;
end;
end;

FError := GetLastError;

if Error <> 0 then
begin
Close;
end;

Result := Error = 0; { Ergebnis zurückgeben }
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetCTS: boolean;
var nStatus: cardinal;
begin
Result := false;
if FHandle <> INVALID_HANDLE_VALUE then
begin
if GetCommModemStatus(FHandle, nStatus) then
Result := (nStatus and MS_CTS_ON) > 0;
end;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetDSR: boolean;
var nStatus: cardinal;
begin
Result := false;
if FHandle <> INVALID_HANDLE_VALUE then
begin
if GetCommModemStatus(FHandle, nStatus) then
Result := (nStatus and MS_DSR_ON) > 0;
end;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetIsOpen: boolean;
begin
Result := FHandle <> INVALID_HANDLE_VALUE;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetInBufUsed: cardinal;
var
Comstat: _Comstat;
Errors: DWord;
begin
if ClearCommError(FHandle, Errors, @Comstat) then
Result := Comstat.cbInQue else Result := 0;
end;
{-----------------------------------------------------------------------------------------------}

function TCOM.GetOutBufUsed: cardinal;
var
Comstat: _Comstat;
Errors: DWord;
begin
if ClearCommError(FHandle, Errors, @Comstat) then
Result := Comstat.cbOutQue else Result := 0;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetRI: boolean;
var nStatus: cardinal;
begin
Result := false;
if FHandle <> INVALID_HANDLE_VALUE then
begin
if GetCommModemStatus(FHandle, nStatus) then
Result := (nStatus and MS_RING_ON) > 0;
end;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetRTS: boolean;
begin
Result := false;
if GetCommState(FHandle, FDCB) then
begin
Result := (FDCB.Flags and $3000) > 0;
end;
end;

{-----------------------------------------------------------------------------------------------}

procedure TCOM.SetRTS(const Value: boolean);
begin
if (Value = True) then
EscapeCommFunction(FHandle, WinTypes.SETRTS)
else
EscapeCommFunction(FHandle, WinTypes.CLRRTS);
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetDTR: boolean;
begin
Result := false;
if GetCommState(FHandle, FDCB) then
begin
Result := (FDCB.Flags and $0010) > 0;
end;
end;
{-----------------------------------------------------------------------------------------------}

procedure TCOM.SetDTR(const Value: boolean);
begin
if (Value = True) then
EscapeCommFunction(FHandle, WinTypes.SETDTR)
else
EscapeCommFunction(FHandle, WinTypes.CLRDTR);
end;
{-----------------------------------------------------------------------------------------------}

function TCOM.GetDCD: boolean;
var nStatus: cardinal;
begin
Result := false;
if FHandle <> INVALID_HANDLE_VALUE then
begin
if GetCommModemStatus(FHandle, nStatus) then
Result := (nStatus and MS_RLSD_ON) > 0;
end;
end;


{-----------------------------------------------------------------------------------------------}

procedure TCOM.Close;
begin
if CloseHandle(FHandle) then { Schnittstelle schließen }
FHandle := INVALID_HANDLE_VALUE;

FError := GetLastError;
end;

{-----------------------------------------------------------------------------------------------}

procedure TCOM.Reset;
begin
if not EscapeCommFunction(FHandle, WinTypes.RESETDEV) then
FError := GetLastError;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.RxFlush: boolean;
begin
if FHandle <> INVALID_HANDLE_VALUE then
begin
PurgeComm(FHandle, PURGE_RXCLEAR);
FError := GetLastError;
end;

Result := FError = 0;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.TxFlush: boolean;
begin
if FHandle <> INVALID_HANDLE_VALUE then
begin
PurgeComm(FHandle, PURGE_TXCLEAR);
FError := GetLastError;
end;

Result := FError = 0;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.Send(Data: Char): boolean;
var nWritten, nCount: Cardinal;
begin
Result := false;

if FHandle <> INVALID_HANDLE_VALUE then
begin
nCount := SizeOf(Data);
if WriteFile(FHandle, Data, nCount, nWritten, nil) then
begin
Result := nCount = nWritten;
end;
FError := GetLastError;
end;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.Send(Data: PChar; Len: cardinal): boolean;
var nWritten, nCount: Cardinal;
begin
Result := false;

if FHandle <> INVALID_HANDLE_VALUE then
begin
nCount := Len;
if WriteFile(FHandle, Data^, nCount, nWritten, nil) then
begin
Result := nCount = nWritten;
end;
FError := GetLastError;
end;
end;

{-----------------------------------------------------------------------------------------------}

function TCOM.GetChar(var data: Char): boolean;
var nCount, nRead: cardinal;
begin
Result := false;

if FHandle <> INVALID_HANDLE_VALUE then
begin
nCount := SizeOf(data);

if InBufUsed >= nCount then
begin
if ReadFile(FHandle, data, nCount, nRead, nil) then
begin
Result := nCount = nRead;
end;
end;

FError := GetLastError;
end;
end;


end.