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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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121 lines
3.6 KiB
ObjectPascal
121 lines
3.6 KiB
ObjectPascal
{
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/***************************************************************************
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AsyncProcess.pp
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---------------
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Initial Revision : Tue Dec 06 09:00:00 CET 2005
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***************************************************************************/
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*****************************************************************************
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* *
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* This file is part of the Lazarus Component Library (LCL) *
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* *
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* See the file COPYING.modifiedLGPL.txt, included in this distribution, *
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* for details about the copyright. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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*****************************************************************************
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}
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unit AsyncProcess;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, Process, LCLProc, FileUtil, InterfaceBase, LCLIntf, UTF8Process;
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type
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{ TAsyncProcess }
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TAsyncProcess = class(TProcessUTF8)
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private
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FPipeHandler: PPipeEventHandler;
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FProcessHandler: PProcessEventHandler;
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FOnReadData: TNotifyEvent;
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FOnTerminate: TNotifyEvent;
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protected
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function GetNumBytesAvailable: dword;
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procedure HandlePipeInput(AData: PtrInt; AReasons: TPipeReasons);
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procedure HandleProcessTermination(AData: PtrInt; AReason: TChildExitReason; AInfo: dword);
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procedure UnhookPipeHandle;
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procedure UnhookProcessHandle;
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public
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procedure Execute; override;
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destructor Destroy; override;
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property NumBytesAvailable: dword read GetNumBytesAvailable;
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published
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property OnReadData: TNotifyEvent read FOnReadData write FOnReadData;// You must read all the data in this event. Otherwise it is called again.
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property OnTerminate: TNotifyEvent read FOnTerminate write FOnTerminate;
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end;
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procedure Register;
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implementation
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function TAsyncProcess.GetNumBytesAvailable: dword;
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begin
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if not (poUsePipes in Options) then
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Result := 0
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else
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Result := Output.NumBytesAvailable;
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end;
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destructor TAsyncProcess.Destroy;
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begin
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UnhookProcessHandle;
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UnhookPipeHandle;
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inherited;
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end;
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procedure TAsyncProcess.UnhookProcessHandle;
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begin
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if FProcessHandler <> nil then
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RemoveProcessEventHandler(FProcessHandler);
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end;
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procedure TAsyncProcess.UnhookPipeHandle;
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begin
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if FPipeHandler <> nil then
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RemovePipeEventHandler(FPipeHandler);
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end;
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procedure TAsyncProcess.HandlePipeInput(AData: PtrInt; AReasons: TPipeReasons);
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begin
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if prBroken in AReasons then
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UnhookPipeHandle;
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if prDataAvailable in AReasons then
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if FOnReadData <> nil then
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FOnReadData(Self);
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end;
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procedure TAsyncProcess.HandleProcessTermination(AData: PtrInt; AReason: TChildExitReason; AInfo: dword);
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begin
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UnhookProcessHandle;
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UnhookPipeHandle;
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if FOnTerminate <> nil then
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FOnTerminate(Self);
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end;
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procedure TAsyncProcess.Execute;
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begin
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inherited Execute;
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if poUsePipes in Options then
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FPipeHandler := AddPipeEventHandler(Output.Handle, @HandlePipeInput, 0);
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FProcessHandler := AddProcessEventHandler(ProcessHandle, @HandleProcessTermination, 0);
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end;
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procedure Register;
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begin
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RegisterComponents('System',[TAsyncProcess]);
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end;
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end.
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