📄 win32com.pas
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unit WIN32COM;
(*
**
** Serial and TCP/IP communication routines for DOS, OS/2 and Win9x/NT.
** Tested with: TurboPascal v7.0, (DOS)
** VirtualPascal v2.0, (OS/2, Win32)
** FreePascal v0.99.15 (DOS, Win32)
** Delphi v4.0. (Win32)
**
** Version : 1.01
** Created : 21-May-1998
** Last update : 20-Feb-2000
**
** Note: (c) 1998-2000 by Maarten Bekers
**
*)
This unit is not supported anymore.
Remove this in order to be compiled anyway. The next release of EleCOM will
not include WIN32COM.PAS anymore. W32SNGL.PAS is the replacement unit.
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INTERFACE
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uses Windows, Combase, BufUnit, Threads
{$IFDEF VirtualPascal}
,Use32
{$ENDIF};
Const WriteTimeout = 20000; { Wait max. 20 secs }
ReadTimeOut = 20000; { General event, 20 secs max }
InBufSize = 1024 * 32;
OutBufSize = 1024 * 32;
type TWin32Obj = Object(TCommObj)
ReadProcPtr: Pointer; { Pointer to TX/RX handler (thread) }
WriteProcPtr: 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 }
RecvEvent : PSysEventObj;
DoTxEvent : PSysEventObj;{ Event manually set when we have to transmit }
TxClosedEvent : PSysEventObj; { Event set when the Tx thread is closed }
RxClosedEvent : PSysEventObj; { Event set when the Rx thread is closed }
CriticalTx : PExclusiveObj; { Critical sections }
CriticalRx : PExclusiveObj;
TxThread : PThreadsObj; { The Transmit and Receive threads }
RxThread : 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_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_ReadProc(var TempPtr: Pointer);
procedure Com_WriteProc(var TempPtr: Pointer);
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 }
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destructor TWin32Obj.Done;
begin
inherited done;
end; { destructor Done }
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procedure TWin32Obj.Com_ReadProc(var TempPtr: Pointer);
var EventMask : DWORD;
Success : Boolean;
Props : TCommProp;
ReturnCode: Longint;
DidRead : DWORD;
BlockLen : Longint;
RecvOL : tOverlapped;
begin
New(RecvEvent, Init);
if NOT RecvEvent^.CreateEvent(true) then EXIT;
FillChar(RecvOL, SizeOf(tOverLapped), 0);
RecvOL.hEvent := RecvEvent^.SemHandle;
EventMask := EV_RXCHAR;
SetCommMask(SaveHandle, EventMask); { Signal us if anything is received }
repeat
WaitCommEvent(SaveHandle, EventMask, @RecvOL);
if EndThreads then EXIT;
repeat
ReturnCode := WaitForSingleObject(RecvOL.hEvent, 500);
if ReturnCode = WAIT_OBJECT_0 then
begin
Success := true
end { if }
else Success := false;
if EndThreads then BREAK;
until (Success);
DidRead := 00;
if (NOT Success) OR (EventMask = 0) then EXIT;
if (EndThreads) then EXIT;
{----------------- Start reading the gathered date ---------------------}
CriticalRx^.EnterExclusive;
FillChar(Props, SizeOf(TCommProp), 0);
if GetCommProperties(SaveHandle, Props) then
if InBuffer^.BufRoom > 0 then
begin
BlockLen := Props.dwCurrentRxQueue;
if 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, ReadTimeOut);
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
InBuffer^.Put(InBuffer^.TmpBuf^, DidRead);
end; { if }
CriticalRx^.LeaveExclusive;
until EndThreads;
RxClosedEvent^.SignalEvent;
ExitThisThread;
end; { proc. ComReadProc }
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procedure TWin32Obj.Com_WriteProc(var TempPtr: Pointer);
var BlockLen : Longint;
Written : DWORD;
ReturnCode: Longint;
Success : Boolean;
begin
repeat
if DoTxEvent^.WaitForEvent(WriteTimeOut) then
if NOT EndThreads then
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, WriteTimeOut);
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) }
ReturnCode := OutBuffer^.Get(OutBuffer^.TmpBuf^, Written, true);
if Written <> BlockLen then
DoTxEvent^.SignalEvent;
end; { if }
CriticalTx^.LeaveExclusive;
end; { if }
until EndThreads;
TxClosedEvent^.SignalEvent;
ExitThisThread;
end; { proc. ComWriteProc }
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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(RxClosedEvent, Init);
if NOT RxClosedEvent^.CreateEvent(false) then EXIT;
New(TxClosedEvent, Init);
if NOT TxClosedEvent^.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));
if (InBuffer^.TxtArr=nil) OR (InBuffer^.TmpBuf=nil) then EXIT;
if (OutBuffer^.TxtArr=nil) OR (OutBuffer^.TmpBuf=nil) then EXIT;
{-------------------- Startup a seperate write thread ---------------------}
New(CriticalTx, Init);
CriticalTx^.CreateExclusive;
New(TxThread, Init);
if NOT TxThread^.CreateThread(16384, { Stack size }
@WriteProcPtr, { Actual procedure }
nil, { Parameters }
0) { Creation flags }
then EXIT;
{-------------------- Startup a seperate read thread ----------------------}
New(CriticalRx, Init);
CriticalRx^.CreateExclusive;
New(RxThread, Init);
if NOT RxThread^.CreateThread(16384, { Stack size }
@ReadProcPtr, { Actual procedure }
nil, { Parameters }
0) { Creation flags }
then EXIT;
Result := true;
end; { proc. Com_StartThread }
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procedure TWin32Obj.Com_InitVars;
begin
DoTxEvent := nil;
RxClosedEvent := nil;
TxClosedEvent := nil;
RecvEvent := nil;
ReadEvent := nil;
WriteEvent := nil;
TxThread := nil;
RxThread := nil;
InBuffer := nil;
OutBuffer := nil;
CriticalRx := nil;
CriticalTx := nil;
end; { proc. Com_InitVars }
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