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| Imports System.ComponentModel
Imports System.IO
Imports System.Net
Class MainWindow
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
Dim but As Button = TryCast(sender, Button)
ProgressBar1.Value = 0
Dim worker As BackgroundWorker = New BackgroundWorker() With {.WorkerReportsProgress = True, .WorkerSupportsCancellation = True}
AddHandler worker.DoWork, New DoWorkEventHandler(AddressOf worker_DoWork)
AddHandler worker.ProgressChanged, New ProgressChangedEventHandler(AddressOf worker_ProgressChanged)
AddHandler worker.RunWorkerCompleted, New RunWorkerCompletedEventHandler(AddressOf worker_RunWorkerCompleted)
worker.RunWorkerAsync()
worker.Dispose()
End Sub
Sub worker_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
Dim dataItemsList As New List(Of String)
dataItemsList.Add("jntCA3d.jpg")
dataItemsList.Add("nRVcjd6.jpg")
dataItemsList.Add("b4PDGb8.jpg")
Dim filePath As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
filePath = filePath & "\Test\"
If Not Directory.Exists(filePath) Then
Directory.CreateDirectory(filePath)
End If
Dim ProgressPercentage As Integer = 0
ProgressPercentage = 0
For Each str As String In dataItemsList
collectInfoGB(str, filePath)
ProgressPercentage += 1
TryCast(sender, BackgroundWorker).ReportProgress(ProgressPercentage, dataItemsList.Count)
Next
End Sub
Private Sub collectInfoGB(ByVal str As String, ByVal path As String)
Dim fullUrl = "http://i.imgur.com/" & str
Try
Dim requ As WebRequest = WebRequest.Create(fullUrl)
requ.Timeout = 5000
Dim response As WebResponse = requ.GetResponse()
Dim stream As Stream = response.GetResponseStream()
If Directory.Exists(path) Then
Dim bitmap As New BitmapImage()
bitmap.BeginInit()
bitmap.UriSource = New Uri(fullUrl)
bitmap.EndInit()
'
SaveImage(bitmap, str, path)
End If
Catch webError As WebException
If webError.Status = WebExceptionStatus.Timeout Then
Debug.Print("TimeOut exception")
End If
End Try
End Sub
Sub SaveImage(ByVal bitmap As BitmapImage, ByVal str As String, ByVal path As String)
Debug.Print("passed")
If bitmap.IsDownloading Then
AddHandler bitmap.DownloadCompleted, New EventHandler(Sub(sender As Object, args As EventArgs) processImage(bitmap, str, path))
Else
processImage(bitmap, str, path)
End If
End Sub
Sub processImage(ByVal bitmap As BitmapImage, ByVal str As String, ByVal path As String) ' Limit to 640px
Dim ratio As Decimal = 1
Dim maxSize As Integer = 640
Dim width As Integer = bitmap.PixelWidth
Dim height As Integer = bitmap.PixelHeight
If Math.Max(width, height) > maxSize Then
ratio = maxSize / Math.Max(width, height)
End If
'
Dim tbBitmap As New TransformedBitmap(bitmap, New ScaleTransform(ratio, ratio, 0, 0))
Dim encoder As PngBitmapEncoder = New PngBitmapEncoder()
encoder.Frames.Add(BitmapFrame.Create(tbBitmap))
Using filestream = New FileStream(path & "\" & str & ".png", FileMode.Create)
encoder.Save(filestream)
End Using
End Sub
Private Sub worker_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs)
If e.UserState IsNot Nothing Then
ProgressBar1.Value = CDbl(e.ProgressPercentage / e.UserState * 100)
End If
End Sub
Private Sub worker_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs)
'
End Sub
End Class |
