1 | #Region "Microsoft.VisualBasic::3233674ce9a362af64f6394219df8a25, Microsoft.VisualBasic.Core\Net\wGetTools.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Class wGetTools |
35 | ' |
36 | ' Properties: CurrentSize, Downloading, DownloadSpeed, TotalSize |
37 | ' |
38 | ' Constructor: (+1 Overloads) Sub New |
39 | ' |
40 | ' Function: ToString |
41 | ' |
42 | ' Sub: __downloadTask, (+2 Overloads) Dispose, StartTask |
43 | ' |
44 | ' |
45 | ' /********************************************************************************/ |
46 | |
47 | #End Region |
48 | |
49 | Imports System.IO |
50 | Imports System.Net |
51 | |
52 | Namespace Net |
53 | |
54 | ''' <summary> |
55 | ''' 提供一些比较详细的数据信息和事件处理 |
56 | ''' </summary> |
57 | Public Class wGetTools : Implements System.IDisposable |
58 | |
59 | ReadOnly downloadUrl As String |
60 | ReadOnly fs As FileStream |
61 | ReadOnly savePath As String |
62 | |
63 | ''' <summary> |
64 | ''' Size that has been downloaded |
65 | ''' </summary> |
66 | Public ReadOnly Property CurrentSize As Long = 0 |
67 | ''' <summary> |
68 | ''' Total size of the file that has to be downloaded |
69 | ''' </summary> |
70 | Public ReadOnly Property TotalSize As Long |
71 | |
72 | ''' <summary> |
73 | ''' KB/sec |
74 | ''' </summary> |
75 | ''' <returns></returns> |
76 | Public ReadOnly Property DownloadSpeed As Double |
77 | Get |
78 | Return _speedSamples.Average |
79 | End Get |
80 | End Property |
81 | |
82 | Public Event DownloadProcess(wget As wGetTools, percentage As Double) |
83 | |
84 | ''' <summary> |
85 | ''' Client status |
86 | ''' </summary> |
87 | ''' <returns></returns> |
88 | Public ReadOnly Property Downloading As Boolean |
89 | |
90 | Sub New(downloadUrl As String, SaveFile As String) |
91 | Me.fs = New FileStream(SaveFile, FileMode.CreateNew) 'Create a new FileStream that writes to the desired download path |
92 | Me.downloadUrl = downloadUrl |
93 | Me.savePath = SaveFile |
94 | End Sub |
95 | |
96 | Dim _speedSamples As List(Of Double) |
97 | |
98 | Public Sub StartTask() |
99 | If Downloading Then Return |
100 | |
101 | _Downloading = True |
102 | Call __downloadTask() |
103 | _Downloading = False |
104 | End Sub |
105 | |
106 | Private Sub __downloadTask() |
107 | Dim req As WebRequest = WebRequest.Create(downloadUrl) 'Make a request for the url of the file to be downloaded |
108 | Dim resp As WebResponse = req.GetResponse 'Ask for the response |
109 | |
110 | Dim buffer(8192) As Byte 'Make a buffer |
111 | Dim downloadedsize As Long = 0 |
112 | Dim downloadedTime As Long = 0 |
113 | Dim dlSpeed As Long = 0 |
114 | |
115 | _TotalSize = req.ContentLength |
116 | _speedSamples = New List(Of Double) |
117 | _CurrentSize = 0 |
118 | |
119 | Do While _CurrentSize < _TotalSize |
120 | Dim read As Integer = resp.GetResponseStream.Read(buffer, 0, 8192) 'Read the buffer from the response the WebRequest gave you |
121 | |
122 | fs.Write(buffer, 0, read) 'Write to filestream that you declared at the beginning of the DoWork sub |
123 | |
124 | _CurrentSize += read |
125 | |
126 | downloadedsize += read |
127 | downloadedTime += 1 'Add 1 millisecond for every cycle the While field makes |
128 | |
129 | If downloadedTime = 1000 Then 'Then, if downloadedTime reaches 1000 then it will call this part |
130 | dlSpeed = (downloadedsize / TimeSpan.FromMilliseconds(downloadedTime).TotalSeconds) 'Calculate the download speed by dividing the downloadedSize by the total formatted seconds of the downloadedTime |
131 | |
132 | downloadedTime = 0 'Reset downloadedTime and downloadedSize |
133 | downloadedsize = 0 |
134 | |
135 | Call _speedSamples.Add(dlSpeed) |
136 | |
137 | RaiseEvent DownloadProcess(Me, 100 * CurrentSize / TotalSize) |
138 | End If |
139 | Loop |
140 | |
141 | fs.Close() 'Close the FileStream first, or the FileStream will crash. |
142 | resp.Close() 'Close the response |
143 | End Sub |
144 | |
145 | Public Overrides Function ToString() As String |
146 | Return $"{downloadUrl} ==> {savePath.ToFileURL} [{100 * _currentSize / _totalSize}%, {DownloadSpeed}KB/sec]" |
147 | End Function |
148 | |
149 | #Region "IDisposable Support" |
150 | Private disposedValue As Boolean ' To detect redundant calls |
151 | |
152 | ' IDisposable |
153 | Protected Overridable Sub Dispose(disposing As Boolean) |
154 | If Not Me.disposedValue Then |
155 | If disposing Then |
156 | ' TODO: dispose managed state (managed objects). |
157 | End If |
158 | |
159 | ' TODO: free unmanaged resources (unmanaged objects) and override Finalize() below. |
160 | ' TODO: set large fields to null. |
161 | End If |
162 | Me.disposedValue = True |
163 | End Sub |
164 | |
165 | ' TODO: override Finalize() only if Dispose(disposing As Boolean) above has code to free unmanaged resources. |
166 | 'Protected Overrides Sub Finalize() |
167 | ' ' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above. |
168 | ' Dispose(False) |
169 | ' MyBase.Finalize() |
170 | 'End Sub |
171 | |
172 | ' This code added by Visual Basic to correctly implement the disposable pattern. |
173 | Public Sub Dispose() Implements IDisposable.Dispose |
174 | ' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above. |
175 | Dispose(True) |
176 | ' TODO: uncomment the following line if Finalize() is overridden above. |
177 | ' GC.SuppressFinalize(Me) |
178 | End Sub |
179 | #End Region |
180 | End Class |
181 | End Namespace |