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{
/***************************************************************************
AsyncProcess.pp
---------------
Initial Revision : Tue Dec 06 09:00:00 CET 2005
***************************************************************************/
*****************************************************************************
This file is part of the Lazarus Component Library (LCL)
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
}
unit AsyncProcess;
{$mode objfpc}{$H+}
interface
uses
Classes, Process,
// LazUtils
FileUtil, UTF8Process,
// LCL
InterfaceBase, LCLIntf;
type
{ TAsyncProcess }
TAsyncProcess = class(TProcessUTF8)
private
FPipeHandler: PPipeEventHandler;
FProcessHandler: PProcessEventHandler;
FOnReadData: TNotifyEvent;
FOnTerminate: TNotifyEvent;
protected
function GetNumBytesAvailable: dword;
procedure HandlePipeInput(AData: PtrInt; AReasons: TPipeReasons);
procedure HandleProcessTermination(AData: PtrInt; AReason: TChildExitReason; AInfo: dword);
procedure UnhookPipeHandle;
procedure UnhookProcessHandle;
public
procedure Execute; override;
destructor Destroy; override;
property NumBytesAvailable: dword read GetNumBytesAvailable;
published
property OnReadData: TNotifyEvent read FOnReadData write FOnReadData;// You must read all the data in this event. Otherwise it is called again.
property OnTerminate: TNotifyEvent read FOnTerminate write FOnTerminate;
end;
procedure Register;
implementation
function TAsyncProcess.GetNumBytesAvailable: dword;
begin
if not (poUsePipes in Options) then
Result := 0
else
Result := Output.NumBytesAvailable;
end;
destructor TAsyncProcess.Destroy;
begin
UnhookProcessHandle;
UnhookPipeHandle;
inherited;
end;
procedure TAsyncProcess.UnhookProcessHandle;
begin
if FProcessHandler <> nil then
RemoveProcessEventHandler(FProcessHandler);
end;
procedure TAsyncProcess.UnhookPipeHandle;
begin
if FPipeHandler <> nil then
RemovePipeEventHandler(FPipeHandler);
end;
procedure TAsyncProcess.HandlePipeInput(AData: PtrInt; AReasons: TPipeReasons);
begin
if prBroken in AReasons then
UnhookPipeHandle;
if prDataAvailable in AReasons then
if FOnReadData <> nil then
FOnReadData(Self);
end;
procedure TAsyncProcess.HandleProcessTermination(AData: PtrInt; AReason: TChildExitReason; AInfo: dword);
begin
UnhookProcessHandle;
UnhookPipeHandle;
if FOnTerminate <> nil then
FOnTerminate(Self);
end;
procedure TAsyncProcess.Execute;
begin
inherited Execute;
if poUsePipes in Options then
FPipeHandler := AddPipeEventHandler(Output.Handle, @HandlePipeInput, 0);
FProcessHandler := AddProcessEventHandler(ProcessHandle, @HandleProcessTermination, 0);
end;
procedure Register;
begin
RegisterComponents('System',[TAsyncProcess]);
end;
end.
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