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{
fpGUI IDE - Maximus
Copyright (C) 2012 - 2013 Graeme Geldenhuys
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Description:
---
}
unit filemonitor;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpg_main, fpg_base, contnrs;
type
TFileMonitorEventType = (fmeFileCreated,
fmeFileChanged,
fmeFileDeleted,
fmeFileRenamed,
fmeUnknownChange);
TFileMonitorEventData = record
EventType: TFileMonitorEventType;
FileName: TfpgString;
// OldFileName: TfpgString;
// UserData: Pointer;
end;
TFileChangedEvent = procedure(Sender: TObject; AData: TFileMonitorEventData) of object;
TMonitoredFile = class(TObject)
private
FName: TfpgString;
FSize: Int64;
FDate: TDateTime;
FSHA1: TfpgString;
function AsString: TfpgString;
public
function GetNewSHA1: TfpgString;
procedure UpdateInfo;
property Name: TfpgString read FName write FName;
property Size: Int64 read FSize write FSize;
property Date: TDateTime read FDate write FDate;
property SHA1: TfpgString read FSHA1 write FSHA1;
end;
TFileMonitor = class(TThread)
private
FInterval: LongWord;
FFileList: TThreadList;
FOnFileChanged: TFileChangedEvent;
FCurrent: TMonitoredFile;
FCurrentState: TFileMonitorEventType;
procedure DoFileChangeNotification;
public
constructor CreateCustom;
destructor Destroy; override;
procedure Execute; override;
property Interval: LongWord read FInterval write FInterval;
procedure AddFile(const AFilename: TfpgString);
procedure RemoveFile(const AFilename: TfpgString);
property OnFileChanged: TFileChangedEvent read FOnFileChanged write FOnFileChanged;
end;
implementation
uses
fpg_utils,
sha1;
function ReadFileDate(const AFileName: string): TDateTime;
var
fa: LongInt;
begin
fa := FileAge(AFileName);
Result := FileDateToDateTime(fa);
end;
function ReadFileSize(const AFileName: string): DWord;
var
LFileStream: TFileStream;
begin
LFileStream := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyWrite);
try
Result := LFileStream.Size;
finally
LFileStream.Free;
end;
end;
procedure ReadFileDateSize(const AFileName: string; var ADateTime: TDateTime; var AFileSize: Int64);
begin
ADateTime := ReadFileDate(AFileName);
AFileSize := ReadFileSize(AFileName);
end;
{ TMonitoredFile }
function TMonitoredFile.AsString: TfpgString;
const
OBJ_AS_STRING = '%s %s %d';
begin
Result := Format(OBJ_AS_STRING, [FName, FormatDateTime('yyyy-mm-dd hh:mm:ss', FDate), FSize]);
end;
function TMonitoredFile.GetNewSHA1: TfpgString;
var
lFile: TMonitoredFile;
s: Int64;
d: TDateTime;
begin
s := 0;
d := 0.0;
lFile := TMonitoredFile.Create;
try
lFile.Name := FName;
ReadFileDateSize(lFile.Name, d, s);
lFile.Size := s;
lFile.Date := d;
Result := SHA1ofStr(lFile.AsString);
finally
lFile.Free;
end;
end;
procedure TMonitoredFile.UpdateInfo;
var
s: Int64;
d: TDateTime;
begin
ReadFileDateSize(Name, d, s);
Size := s;
Date := d;
SHA1 := SHA1ofStr(AsString);
end;
{ TFileMonitor }
procedure TFileMonitor.DoFileChangeNotification;
var
rec: TFileMonitorEventData;
begin
if Assigned(FOnFileChanged) then
begin
rec.EventType := FCurrentState;
rec.FileName := FCurrent.Name;
FOnFileChanged(self, rec);
end;
end;
constructor TFileMonitor.CreateCustom;
begin
Create(True);
FFileList := TThreadList.Create;
FInterval := 500;
end;
destructor TFileMonitor.Destroy;
var
f: TMonitoredFile;
lst: TList;
i: integer;
begin
try
lst := FFileList.LockList;
for i := lst.Count-1 downto 0 do
begin
f := TMonitoredFile(lst[i]);
lst.Remove(f);
f.Free;
end;
finally
FFileList.UnlockList;
end;
FFileList.Free;
inherited Destroy;
end;
procedure TFileMonitor.Execute;
var
i: integer;
lFile: TMonitoredFile;
lst: TList;
begin
while not Terminated do
begin
if Assigned(FOnFileChanged) then
begin
lst := FFileList.LockList;
try
for i := lst.Count-1 downto 0 do
begin
lFile := TMonitoredFile(lst[i]);
if fpgFileExists(lFile.Name) then
begin
if lFile.SHA1 <> lFile.GetNewSHA1 then
begin
FCurrent := lFile;
FCurrentState := fmeFileChanged;
Synchronize(@DoFileChangeNotification);
lFile.UpdateInfo;
end;
end
else
begin
FCurrent := lFile;
FCurrentState := fmeFileDeleted;
Synchronize(@DoFileChangeNotification);
lst.Remove(lFile);
end;
end;
finally
FFileList.UnlockList;
end;
end;
sleep(FInterval);
end;
end;
procedure TFileMonitor.AddFile(const AFilename: TfpgString);
var
lFile: TMonitoredFile;
s: Int64;
d: TDateTime;
begin
s := 0;
d := 0.0;
lFile := TMonitoredFile.Create;
lFile.Name := AFileName;
ReadFileDateSize(AFileName, d, s);
lFile.Size := s;
lFile.Date := d;
lFile.SHA1 := SHA1ofStr(lFile.AsString);
FFileList.Add(lFile);
end;
procedure TFileMonitor.RemoveFile(const AFilename: TfpgString);
var
i: integer;
lFile: TMonitoredFile;
lst: TList;
begin
lst := FFileList.LockList;
try
for i := 0 to lst.Count-1 do
begin
if AFilename = TMonitoredFile(lst[i]).Name then
begin
lFile := TMonitoredFile(lst[i]);
lst.Delete(i);
lFile.Free;
break;
end;
end;
finally
FFileList.UnlockList;
end;
end;
end.
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