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2022-06-21 17:11:35 -07:00
unit W32SNGL;
(*
**
** Serial and TCP/IP communication routines for DOS, OS/2 and Win9x/NT.
** Tested with: TurboPascal v7.0, (DOS)
** VirtualPascal v2.1, (OS/2, Win32)
** FreePascal v0.99.15 (DOS, Win32)
** Delphi v4.0. (Win32)
**
** Version : 1.02
** Created : 09-Sep-1999
** Last update : 21-Jul-2001
**
** Note: (c) 1998-2000 by Maarten Bekers
**
** Note2: The problem with this approach that we only retrieve the data when
** we want to. If data arrives and we dont call either Com_ReadBlock(),
** Com_CharAvail or Com_GetBufferStatus() we dont receive the data.
** Therefore, we rely on Windows to actually buffer the data. We do this
** by calling SetupComm() with the buffer-sizes as defined by
** Win32OutBufSize and Win32InBufSize.
** If you want to avoid this, you can implement another mutex that you
** let set by Win32's API calls SetEventMask() and WaitCommEvent().
** That way, you can also monitor other events which would eliminate
** some overhead. In general, this approach will suffice.
**
*)
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INTERFACE
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uses Windows, Combase, BufUnit, Threads
{$IFDEF VirtualPascal}
,Use32
{$ENDIF};
Const DataTimeout = 20000; { Wait max. 20 secs }
InBufSize = 1024 * 32;
OutBufSize = 1024 * 32;
Win32OutBufSize = 1024 * 3;
Win32InBufSize = 1024 * 3;
type TWin32Obj = Object(TCommObj)
DataProcPtr: Pointer; { Pointer to TX/RX handler (thread) }
ThreadsInitted: Boolean; { Are the thread(s) up and running? }
SaveHandle : THandle;
InitPortNr : Longint;
InitHandle : Longint;
ReadOL : TOverLapped; { Overlapped structure for ReadFile }
WriteOL : TOverLapped; { Overlapped structure for WriteFile }
InBuffer : ^BufArrayObj; { Buffer system internally used }
OutBuffer : ^BufArrayObj;
ReadEvent : PSysEventObj; { Event set by ReadFile overlapped routine }
WriteEvent : PSysEventObj; { Event set by WriteFile overlapped routine }
DoTxEvent : PSysEventObj;{ Event manually set when we have to transmit }
DoRxEvent : PSysEventObj; { Event manually set when we want data }
DataClosedEvent: PSysEventObj; { Event set when the Tx thread is closed }
CriticalTx : PExclusiveObj; { Critical sections }
CriticalRx : PExclusiveObj;
DataThread : PThreadsObj;
EndThreads : Boolean; { Set to true when we have to end the threads }
constructor Init;
destructor Done;
function Com_Open(Comport: Byte; BaudRate: Longint; DataBits: Byte;
Parity: Char; StopBits: Byte): Boolean; virtual;
function Com_OpenKeep(Comport: Byte): Boolean; virtual;
function Com_GetChar: Char; virtual;
function Com_CharAvail: Boolean; virtual;
function Com_Carrier: Boolean; virtual;
function Com_SendChar(C: Char): Boolean; virtual;
function Com_ReadyToSend(BlockLen: Longint): Boolean; virtual;
function Com_GetBPSrate: Longint; virtual;
function Com_GetHandle: Longint; virtual;
procedure Com_OpenQuick(Handle: Longint); virtual;
procedure Com_Close; virtual;
procedure Com_SendBlock(var Block; BlockLen: Longint; var Written: Longint); virtual;
procedure Com_ReadBlock(var Block; BlockLen: Longint; var Reads: Longint); virtual;
procedure Com_GetBufferStatus(var InFree, OutFree, InUsed, OutUsed: Longint); virtual;
procedure Com_SetDtr(State: Boolean); virtual;
procedure Com_GetModemStatus(var LineStatus, ModemStatus: Byte); virtual;
procedure Com_SetLine(BpsRate: longint; Parity: Char; DataBits, Stopbits: Byte); virtual;
procedure Com_PurgeInBuffer; virtual;
procedure Com_PurgeOutBuffer; virtual;
procedure Com_FlushOutBuffer(Slice: SliceProc); virtual;
procedure Com_PauseCom(CloseCom: Boolean); virtual;
procedure Com_ResumeCom(OpenCom: Boolean); virtual;
procedure Com_SetFlow(SoftTX, SoftRX, Hard: Boolean); virtual;
procedure Com_SetDataProc(ReadPtr, WritePtr: Pointer); virtual;
procedure Com_DataProc(var TempPtr: Pointer); virtual;
function Com_StartThread: Boolean;
procedure Com_InitVars;
procedure Com_StopThread;
procedure Com_InitDelayTimes;
end; { object TWin32Obj }
type PWin32Obj = ^TWin32Obj;
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IMPLEMENTATION
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uses SysUtils;
{$IFDEF FPC}
{$I WINDEF.FPC}
{$ENDIF}
const
dcb_Binary = $00000001;
dcb_ParityCheck = $00000002;
dcb_OutxCtsFlow = $00000004;
dcb_OutxDsrFlow = $00000008;
dcb_DtrControlMask = $00000030;
dcb_DtrControlDisable = $00000000;
dcb_DtrControlEnable = $00000010;
dcb_DtrControlHandshake = $00000020;
dcb_DsrSensivity = $00000040;
dcb_TXContinueOnXoff = $00000080;
dcb_OutX = $00000100;
dcb_InX = $00000200;
dcb_ErrorChar = $00000400;
dcb_NullStrip = $00000800;
dcb_RtsControlMask = $00003000;
dcb_RtsControlDisable = $00000000;
dcb_RtsControlEnable = $00001000;
dcb_RtsControlHandshake = $00002000;
dcb_RtsControlToggle = $00003000;
dcb_AbortOnError = $00004000;
dcb_Reserveds = $FFFF8000;
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constructor TWin32Obj.Init;
begin
inherited Init;
InitPortNr := -1;
InitHandle := -1;
ThreadsInitted := false;
Com_Initvars;
end; { constructor Init }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
destructor TWin32Obj.Done;
begin
inherited done;
end; { destructor Done }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_DataProc(var TempPtr: Pointer);
var Success : Boolean;
Props : TCommProp;
ObjectCode : Longint;
ReturnCode : Longint;
DidRead : DWORD;
Written : DWORD;
BlockLen : DWORD;
ObjectArray : Array[0..1] of THandle;
TryReading : Boolean;
Stats : TComStat;
ErrMask : DWORD;
begin
ObjectArray[0] := DoTxEvent^.SemHandle;
ObjectArray[1] := DoRxEvent^.SemHandle;
repeat
ObjectCode := WaitForMultipleObjects(2,
@ObjectArray,
false,
DataTimeOut);
if EndThreads then EXIT;
{-----------------------------------------------------------------------}
{-------------------------- Receive signalled --------------------------}
{-----------------------------------------------------------------------}
if (ObjectCode - WAIT_OBJECT_0) = 1 then { DoReceive }
begin
DidRead := 00;
if (EndThreads) then EXIT;
{-- Make sure there is something to be read ------------------------}
ErrMask := 0;
TryReading := FALSE;
if ClearCommError(SaveHandle, ErrMask, @Stats) then
if Stats.cbInQue > 0 then
TryReading := TRUE;
{----------------- Start reading the gathered date -----------------}
if TryReading then
begin
CriticalRx^.EnterExclusive;
FillChar(Props, SizeOf(TCommProp), 0);
if GetCommProperties(SaveHandle, Props) then
if InBuffer^.BufRoom > 0 then
begin
BlockLen := Props.dwCurrentRxQueue;
{ We want the complete BUFFER size, and not }
{ the actual queue size. The queue may have }
{ grown since last query, and we always }
{ want as much data as possible }
if Longint(BlockLen) > InBuffer^.BufRoom then
BlockLen := InBuffer^.BufRoom;
Success := ReadFile(SaveHandle,
InBuffer^.TmpBuf,
BlockLen,
DidRead,
@ReadOL);
if NOT Success then
begin
ReturnCode := GetLastError;
if ReturnCode = ERROR_IO_PENDING then
begin
ReturnCode := WaitForSingleObject(ReadOL.hEvent, DataTimeOut);
if ReturnCode = WAIT_OBJECT_0 then
begin
GetOverLappedResult(SaveHandle, ReadOL, DidRead, false);
end; { if }
end; { if }
end
else GetOverlappedResult(SaveHandle, ReadOL, DidRead, false);
if DidRead > 00 then
begin
InBuffer^.Put(InBuffer^.TmpBuf, DidRead);
DoRxEvent^.ResetEvent;
end; { if }
end; { if }
CriticalRx^.LeaveExclusive;
end; { try reading }
end; { DoReceive call }
{-----------------------------------------------------------------------}
{-------------------------- Transmit signalled -------------------------}
{-----------------------------------------------------------------------}
if (ObjectCode - WAIT_OBJECT_0) = 0 then { DoTransmit }
begin
CriticalTx^.EnterExclusive;
DoTxEvent^.ResetEvent;
if OutBuffer^.BufUsed > 00 then
begin
Written := 00;
BlockLen := OutBuffer^.Get(OutBuffer^.TmpBuf, OutBuffer^.BufUsed, false);
Success := WriteFile(SaveHandle,
OutBuffer^.TmpBuf,
BlockLen,
Written,
@WriteOL);
if NOT Success then
begin
ReturnCode := GetLastError;
if ReturnCode = ERROR_IO_PENDING then
begin
ReturnCode := WaitForSingleObject(WriteOL.hEvent, DataTimeOut);
if ReturnCode = WAIT_OBJECT_0 then
begin
if GetOverLappedResult(SaveHandle, WriteOL, Written, false) then
begin
ResetEvent(WriteOL.hEvent);
end; { if }
end; { if }
end; { result is pending }
end { if }
else begin
if GetOverLappedResult(SaveHandle, WriteOL, Written, false) then
begin
ResetEvent(WriteOL.hEvent);
end; { if }
end; { if (did succeed) }
{-- remove the data from the buffer, but only remove the data ---}
{-- thats actually written --------------------------------------}
ReturnCode := OutBuffer^.Get(OutBuffer^.TmpBuf, Written, true);
if ReturnCode <> Longint(Written) then
begin
{ not everything is removed! }
end; { if }
{-- if theres data in the buffer left, run this event again -----}
if Written <> BlockLen then
DoTxEvent^.SignalEvent;
end; { if }
CriticalTx^.LeaveExclusive;
end; { DoTransmit call }
until EndThreads;
DataClosedEvent^.SignalEvent;
ExitThisThread;
end; { proc. ComDataProc }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_StartThread: Boolean;
begin
Result := false;
EndThreads := false;
if ThreadsInitted then EXIT;
ThreadsInitted := true;
{----------------------- Create all the events ----------------------------}
New(ReadEvent, Init);
if NOT ReadEvent^.CreateEvent(true) then EXIT;
New(WriteEvent, Init);
if NOT WriteEvent^.CreateEvent(true) then EXIT;
New(DoTxEvent, Init);
if NOT DoTxEvent^.CreateEvent(false) then EXIT;
New(DoRxEvent, Init);
if NOT DoRxEvent^.CreateEvent(false) then EXIT;
New(DataClosedEvent, Init);
if NOT DataClosedEvent^.CreateEvent(false) then EXIT;
{-------------- Startup the buffers and overlapped events -----------------}
FillChar(WriteOL, SizeOf(tOverLapped), 0);
FillChar(ReadOL, SizeOf(tOverLapped), 0);
WriteOl.hEvent := WriteEvent^.SemHandle;
ReadOl.hEvent := ReadEvent^.SemHandle;
New(InBuffer, Init(InBufSize));
New(OutBuffer, Init(OutBufSize));
{-------------------- Startup the critical section objects ----------------}
New(CriticalTx, Init);
CriticalTx^.CreateExclusive;
New(CriticalRx, Init);
CriticalRx^.CreateExclusive;
{-------------------- Startup a seperate tx / rx thread -------------------}
New(DataThread, Init);
if NOT DataThread^.CreateThread(16384, { Stack size }
DataProcPtr, { Actual procedure }
nil, { Parameters }
0) { Creation flags }
then EXIT;
Result := true;
end; { proc. Com_StartThread }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_InitVars;
begin
DoTxEvent := nil;
DoRxEvent := nil;
DataClosedEvent := nil;
DataThread := nil;
ReadEvent := nil;
WriteEvent := nil;
InBuffer := nil;
OutBuffer := nil;
CriticalRx := nil;
CriticalTx := nil;
end; { proc. Com_InitVars }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_StopThread;
begin
EndThreads := true;
ThreadsInitted := false;
if DoTxEvent <> nil then DoTxEvent^.SignalEvent;
if DoTxEvent <> nil then DoRxEvent^.SignalEvent;
if DataThread <> nil then DataThread^.CloseThread;
if DataClosedEvent <> nil then
if NOT DataClosedEvent^.WaitForEvent(1000) then
DataThread^.TerminateThread(0);
if DataThread <> nil then Dispose(DataThread, Done);
if DoTxEvent <> nil then Dispose(DoTxEvent, Done);
if DoRxEvent <> nil then Dispose(DoRxEvent, Done);
if DataClosedEvent <> nil then Dispose(DataClosedEvent, Done);
if ReadEvent <> nil then Dispose(ReadEvent, Done);
if WriteEvent <> nil then Dispose(WriteEvent, Done);
if CriticalTx <> nil then Dispose(CriticalTx, Done);
if CriticalRx <> nil then Dispose(CriticalRx, Done);
if InBuffer <> nil then Dispose(InBuffer, Done);
if OutBuffer <> nil then Dispose(OutBuffer, Done);
Com_InitVars;
end; { proc. Com_StopThread }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_InitDelayTimes;
var CommTimeOut: TCommTimeouts;
RC : Longint;
begin
FillChar(CommTimeOut, SizeOf(TCommTimeOuts), 00);
CommTimeOut.ReadIntervalTimeout := MAXDWORD;
if NOT SetCommTimeOuts(SaveHandle, CommTimeOut) then
begin
RC := GetLastError;
ErrorStr := 'Error setting communications timeout: #'+IntToStr(RC) + ' / ' + SysErrorMessage(rc);
end; { if }
end; { proc. InitDelayTimes }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_GetHandle: Longint;
begin
Result := SaveHandle;
end; { func. Com_GetHandle }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_OpenQuick(Handle: Longint);
var LastError: Longint;
begin
SaveHandle := Handle;
InitHandle := Handle;
FillChar(ReadOl, SizeOf(ReadOl), 00);
FillChar(WriteOl, SizeOf(WriteOl), 00);
if NOT SetupComm(Com_GetHandle, Win32InBufSize, Win32OutBufSize) then
begin
LastError := GetLastError;
ErrorStr := 'Error setting up communications buffer: #'+IntToStr(LastError) + ' / '+SysErrorMessage(LastError);
end; { if }
Com_InitDelayTimes;
InitFailed := NOT Com_StartThread;
Com_SetLine(-1, 'N', 8, 1);
end; { proc. TWin32Obj.Com_OpenQuick }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_OpenKeep(Comport: Byte): Boolean;
var TempSave : THandle;
Security : TSECURITYATTRIBUTES;
LastError : Longint;
begin
InitPortNr := Comport;
FillChar(ReadOl, SizeOf(ReadOl), 00);
FillChar(WriteOl, SizeOf(WriteOl), 00);
FillChar(Security, SizeOf(TSECURITYATTRIBUTES), 0);
Security.nLength := SizeOf(TSECURITYATTRIBUTES);
Security.lpSecurityDescriptor := nil;
Security.bInheritHandle := true;
TempSave := CreateFile(PChar('\\.\COM' + IntToStr(ComPort)),
GENERIC_READ or GENERIC_WRITE,
0,
@Security, { No Security }
OPEN_EXISTING, { Creation action }
FILE_ATTRIBUTE_NORMAL or FILE_FLAG_OVERLAPPED,
0); { No template }
LastError := GetLastError;
if LastError <> 0 then
ErrorStr := 'Unable to open communications port';
SaveHandle := TempSave;
Result := (TempSave <> INVALID_HANDLE_VALUE);
if Result then { Make sure that "CharAvail" isn't going to wait }
begin
Com_InitDelayTimes;
end; { if }
if NOT SetupComm(Com_GetHandle, Win32InBufSize, Win32OutBufSize) then
begin
LastError := GetLastError;
ErrorStr := 'Error setting up communications buffer: #'+IntToStr(LastError) + ' / '+SysErrorMessage(LastError);
end; { if }
InitFailed := NOT Com_StartThread;
end; { func. Com_OpenKeep }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_Open(Comport: Byte; BaudRate: Longint; DataBits: Byte;
Parity: Char; StopBits: Byte): Boolean;
begin
Com_Open := Com_OpenKeep(Comport);
Com_SetLine(Baudrate, Parity, DataBits, StopBits);
end; { func. TWin32Obj.Com_OpenCom }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_SetLine(BpsRate: longint; Parity: Char; DataBits, Stopbits: Byte);
var DCB : TDCB;
BPSID : Longint;
begin
if BpsRate = 11520 then { small fix for EleBBS inability to store the bps }
BpsRate := 115200; { rate in anything larger than a 16-bit integer }
GetCommState(Com_GetHandle, DCB);
if NOT (Parity in ['N', 'E', 'O', 'M']) then Parity := 'N';
if BpsRate >= 0 then dcb.BaudRate := BpsRate;
dcb.StopBits := ONESTOPBIT;
Case Parity of
'N' : dcb.Parity := NOPARITY;
'E' : dcb.Parity := EVENPARITY;
'O' : dcb.Parity := ODDPARITY;
'M' : dcb.Parity := MARKPARITY;
end; { case }
Case StopBits of
1 : dcb.StopBits := ONESTOPBIT;
2 : dcb.StopBits := TWOSTOPBITS;
3 : dcb.StopBits := ONE5STOPBITS;
end; { case }
dcb.ByteSize := DataBits;
dcb.Flags := dcb.Flags OR dcb_Binary OR Dcb_DtrControlEnable;
if not SetCommState (Com_GetHandle, DCB) then
begin
BPSId := GetLastError;
ErrorStr := 'Error setting up communications parameters: #'+IntToStr(BpsId) + ' / '+SysErrorMessage(BpsId);
end; { if }
end; { proc. TWin32Obj.Com_SetLine }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_Close;
begin
if DontClose then EXIT;
if DWORD(Com_GetHandle) <> INVALID_HANDLE_VALUE then
begin
Com_StopThread;
CloseHandle(Com_GetHandle);
SaveHandle := INVALID_HANDLE_VALUE;
end;
end; { func. TWin32Obj.Com_CloseCom }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_SendChar(C: Char): Boolean;
var Written: Longint;
begin
Com_SendBlock(C, SizeOf(C), Written);
Com_SendChar := (Written = SizeOf(c));
end; { proc. TWin32Obj.Com_SendChar }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_GetChar: Char;
var Reads: Longint;
begin
Com_ReadBlock(Result, SizeOf(Result), Reads);
end; { func. TWin32Obj.Com_GetChar }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_SendBlock(var Block; BlockLen: Longint; var Written: Longint);
begin
if OutBuffer^.BufRoom < BlockLen then
repeat
{$IFDEF WIN32}
Sleep(1);
{$ENDIF}
until (OutBuffer^.BufRoom >= BlockLen) OR (NOT Com_Carrier);
CriticalTx^.EnterExclusive;
Written := OutBuffer^.Put(Block, BlockLen);
CriticalTx^.LeaveExclusive;
DoTxEvent^.SignalEvent;
end; { proc. TWin32Obj.Com_SendBlock }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_ReadBlock(var Block; BlockLen: Longint; var Reads: Longint);
begin
if InBuffer^.BufUsed < BlockLen then
begin
DoRxEvent^.SignalEvent;
while (InBuffer^.BufUsed < BlockLen) AND (Com_Carrier) do
begin
Sleep(1);
if Com_CharAvail then
DoRxEvent^.SignalEvent;
end; { while }
end; { if }
CriticalRx^.EnterExclusive;
Reads := InBuffer^.Get(Block, BlockLen, true);
CriticalRx^.LeaveExclusive;
end; { proc. TWin32Obj.Com_ReadBlock }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_CharAvail: Boolean;
var Props : TComStat;
ErrMask : DWORD;
begin
if InBuffer^.BufUsed < 1 then
begin
ErrMask := 0;
if ClearCommError(Com_GetHandle, ErrMask, @Props) then
if Props.cbInQue > 0 then
DoRxEvent^.SignalEvent;
end; { if }
Result := (InBuffer^.BufUsed > 0);
end; { func. TWin32Obj.Com_CharAvail }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_Carrier: Boolean;
var Status: DWORD;
begin
if Com_GetHandle <> INVALID_HANDLE_VALUE then
begin
GetCommModemStatus(Com_GetHandle,
Status);
Result := (Status AND MS_RLSD_ON) <> 00;
end
else Result := FALSE;
end; { func. TWin32Obj.Com_Carrier }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_GetModemStatus(var LineStatus, ModemStatus: Byte);
var Data: DWORD;
begin
GetCommModemStatus(Com_GetHandle, Data);
ModemStatus := ModemStatus and $0F;
ModemStatus := ModemStatus or Byte(Data);
end; { proc. TWin32Obj.Com_GetModemStatus }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_SetDtr(State: Boolean);
begin
if State then
EscapeCommFunction(Com_GetHandle, SETDTR)
else EscapeCommFunction(Com_GetHandle, CLRDTR);
end; { proc. TWin32Obj.Com_SetDtr }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_GetBpsRate: Longint;
var DCB : TDCB;
begin
GetCommState(Com_GetHandle, DCB);
Com_GetBpsRate := dcb.Baudrate;
end; { func. TWin32Obj.Com_GetBpsRate }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_GetBufferStatus(var InFree, OutFree, InUsed, OutUsed: Longint);
var Stats : TComStat;
ErrMask : DWORD;
begin
if ClearCommError(Com_GetHandle, ErrMask, @Stats) then
begin
if Stats.cbInQue > 0 then
begin
DoRxEvent^.SignalEvent;
Sleep(1);
end; { if }
end; { if }
InFree := InBuffer^.BufRoom;
OutFree := OutBuffer^.BufRoom;
InUsed := InBuffer^.BufUsed;
OutUsed := OutBuffer^.BufUsed;
end; { proc. TWin32Obj.Com_GetBufferStatus }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_PurgeInBuffer;
begin
CriticalRx^.EnterExclusive;
InBuffer^.Clear;
PurgeComm(Com_GetHandle, PURGE_RXCLEAR);
CriticalRx^.LeaveExclusive;
end; { proc. TWin32Obj.Com_PurgeInBuffer }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_PurgeOutBuffer;
begin
CriticalTx^.EnterExclusive;
OutBuffer^.Clear;
PurgeComm(Com_GetHandle, PURGE_TXCLEAR);
CriticalTx^.LeaveExclusive;
end; { proc. TWin32Obj.Com_PurgeInBuffer }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
function TWin32Obj.Com_ReadyToSend(BlockLen: Longint): Boolean;
begin
Result := OutBuffer^.BufRoom >= BlockLen;
end; { func. ReadyToSend }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_PauseCom(CloseCom: Boolean);
begin
if CloseCom then Com_Close
else Com_StopThread;
end; { proc. Com_PauseCom }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_ResumeCom(OpenCom: Boolean);
begin
if OpenCom then
begin
if InitPortNr <> -1 then Com_OpenKeep(InitPortNr)
else Com_OpenQuick(InitHandle);
end
else InitFailed := NOT Com_StartThread;
end; { proc. Com_ResumeCom }
(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
procedure TWin32Obj.Com_FlushOutBuffer(Slice: SliceProc);
begin
Windows.FlushFileBuffers(Com_GetHandle);
inherited Com_FlushOutBuffer(Slice);
end; { proc. Com_FlushOutBuffer }
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procedure TWin32Obj.Com_SetFlow(SoftTX, SoftRX, Hard: Boolean);
var DCB : TDCB;
BPSID : Longint;
begin
GetCommState(Com_GetHandle, DCB);
if Hard then
dcb.Flags := dcb.Flags OR NOT dcb_OutxCtsFlow OR NOT dcb_RtsControlHandshake;
if SoftTX then
dcb.Flags := dcb.Flags OR NOT dcb_OutX;
if SoftRX then
dcb.Flags := dcb.Flags OR NOT dcb_InX;
if not SetCommState(Com_GetHandle, DCB) then
begin
BPSId := GetLastError;
ErrorStr := 'Error setting up communications parameters: #'+IntToStr(BpsId) + ' / '+SysErrorMessage(BpsId);
end; { if }
Com_InitDelayTimes;
end; { proc. Com_SetFlow }
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procedure TWin32Obj.Com_SetDataProc(ReadPtr, WritePtr: Pointer);
begin
DataProcPtr := ReadPtr;
end; { proc. Com_SetDataProc }
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end.