-
Notifications
You must be signed in to change notification settings - Fork 197
Expand file tree
/
Copy pathQuick.FileMonitor.pas
More file actions
197 lines (174 loc) · 5.06 KB
/
Copy pathQuick.FileMonitor.pas
File metadata and controls
197 lines (174 loc) · 5.06 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
{ ***************************************************************************
Copyright (c) 2015-2026 Kike Perez
Unit : Quick.FileMonitor
Description : Watch for single file changes
Author : Kike Perez
Version : 1.2
Created : 11/09/2017
Modified : 29/01/2019
This file is part of QuickLib: https://github.com/exilon/QuickLib
***************************************************************************
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*************************************************************************** }
unit Quick.FileMonitor;
interface
{$i QuickLib.inc}
uses
Classes,
{$IFDEF MSWINDOWS}
Windows,
SyncObjs,
{$ELSE}
SyncObjs,
{$ENDIF}
SysUtils,
{$IFDEF FPC}
Quick.Files;
{$ELSE}
System.IOUtils;
{$ENDIF}
type
TMonitorNotify = (mnNone, mnFileCreated, mnFileModified, mnFileDeleted);
TMonitorWatch = set of TMonitorNotify;
TFileChangeNotify = procedure(MonitorNofify : TMonitorNotify) of object;
TFileMonitor = class(TThread)
private
fFileName : string;
fTickEvent : TSimpleEvent;
fInterval : Integer;
fNotifies : TMonitorWatch;
fEnabled : Boolean;
fExists : Boolean;
fModifedDate : TDateTime;
fCurrentMonitorNotify : TMonitorNotify;
fOnChangeNotify : TFileChangeNotify;
fIsThreadStarted : Boolean;
procedure SetEnabled(Status : Boolean);
procedure NotifyEvent;
protected
procedure Execute; override;
public
constructor Create;
destructor Destroy; override;
property FileName : string read fFileName write fFileName;
property Interval : Integer read fInterval write fInterval;
property Notifies : TMonitorWatch read fNotifies write fNotifies;
property OnFileChange : TFileChangeNotify read fOnChangeNotify write fOnChangeNotify;
property Enabled : Boolean read fEnabled write SetEnabled;
end;
TQuickFileMonitor = TFileMonitor;
implementation
constructor TFileMonitor.Create;
begin
inherited Create(True);
fIsThreadStarted := False;
fEnabled := False;
Self.FreeOnTerminate := False;
fInterval := 1000;
fExists := False;
fModifedDate := 0;
fCurrentMonitorNotify := mnNone;
fNotifies := [mnFileCreated,mnFileModified,mnFileDeleted];
{$IFDEF FPC}
fTickEvent := TSimpleEvent.Create;
{$ELSE}
fTickEvent := TSimpleEvent.Create(nil,True,False,'');
{$ENDIF}
end;
destructor TFileMonitor.Destroy;
begin
if not Terminated then Terminate;
Self.WaitFor;
fTickEvent.SetEvent;
fTickEvent.Free;
inherited;
end;
procedure TFileMonitor.Execute;
var
LastModifiedDate : TDateTime;
begin
inherited;
while not Terminated do
begin
fCurrentMonitorNotify := mnNone;
if fTickEvent.WaitFor(fInterval) = TWaitResult.wrTimeout then
begin
if fEnabled then
begin
if TFile.Exists(fFileName) then
begin
if fExists then
begin
if mnFileModified in fNotifies then
begin
LastModifiedDate := TFile.GetLastWriteTime(fFileName);
if LastModifiedDate > fModifedDate then
begin
fCurrentMonitorNotify := mnFileModified;
fModifedDate := LastModifiedDate;
end;
end;
end
else
begin
if mnFileCreated in fNotifies then fCurrentMonitorNotify := mnFileCreated;
LastModifiedDate := TFile.GetLastWriteTime(fFileName);
fModifedDate := LastModifiedDate;
end;
fExists := True;
end
else
begin
//check if file deleted
if mnFileDeleted in fNotifies then
begin
if fExists then
begin
fExists := False;
fCurrentMonitorNotify := mnFileDeleted;
end;
end;
end;
if fCurrentMonitorNotify <> mnNone then
begin
if IsConsole then NotifyEvent
else Synchronize(NotifyEvent);
end;
end;
end;
end;
end;
procedure TFileMonitor.SetEnabled(Status : Boolean);
begin
if fEnabled <> Status then
begin
if Status then
begin
//gets current values
if TFile.Exists(fFileName) then
begin
fExists := True;
fModifedDate := TFile.GetLastWriteTime(fFileName);
end;
end;
if not fIsThreadStarted then
begin
fIsThreadStarted := True;
if (Status) and {$IFNDEF FPC}(Started = False){$ELSE}(Suspended){$ENDIF} then Start;
end;
fEnabled := Status;
end;
end;
procedure TFileMonitor.NotifyEvent;
begin
if Assigned(fOnChangeNotify) then fOnChangeNotify(fCurrentMonitorNotify);
end;
end.