The project shows the resizing of the image, means create the thumb file of the actual image, here i show how to create the thumb as well as Medium sized file.
first create the class file named “GeneralMethods.vb”
Public Class GeneralMethods
Public Shared Function CreateThumbImage(ByVal imgPhoto As Image, ByVal Width As Integer, ByVal Height As Integer) As Image
Dim bmpOut As Bitmap = Nothing
Try
Dim oBMP As New Bitmap(imgPhoto)
Dim oFormat As Imaging.ImageFormat = oBMP.RawFormat
Dim NewWidth As Integer = 0
Dim NewHeight As Integer = 0
'*** If the image is smaller than a thumbnail just return it
If oBMP.Width <= Width AndAlso oBMP.Height <= Height Then
Return imgPhoto
End If
Dim per As Double
If oBMP.Width > Width Or oBMP.Height > Height Then
If oBMP.Width > oBMP.Height Then
per = (100 * Width) / oBMP.Width
NewWidth = (oBMP.Width * per) / 100
NewHeight = (oBMP.Height * per) / 100
Else
per = (100 * Height) / oBMP.Height
NewWidth = (oBMP.Width * per) / 100
NewHeight = (oBMP.Height * per) / 100
End If
If NewHeight > Height Or NewWidth > Width Then
If NewWidth > NewHeight Then
per = (100 * Width) / NewWidth
Else
per = (100 * Height) / NewHeight
End If
NewWidth = (NewWidth * per) / 100
NewHeight = (NewHeight * per) / 100
End If
End If
bmpOut = New Bitmap(NewWidth, NewHeight)
Dim g As Graphics = Graphics.FromImage(bmpOut)
g.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
g.InterpolationMode = Drawing2D.InterpolationMode.High
g.CompositingQuality = Drawing2D.CompositingQuality.HighQuality
Dim codec As Drawing.Imaging.ImageCodecInfo = Drawing.Imaging.ImageCodecInfo.GetImageEncoders(1)
Dim eParams As Drawing.Imaging.EncoderParameter = New System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 1)
g.FillRectangle(Brushes.White, 0, 0, NewWidth, NewHeight)
g.DrawImage(oBMP, 0, 0, NewWidth, NewHeight)
oBMP.Dispose()
Catch
Return Nothing
End Try
Return bmpOut
End Function
Imports this 2 namesapces,
Imports System.IO
Imports System.Drawing
in the html side, take a fileupload control named “file1” and one button.
on the click of the button write the following code
If file1.HasFile Then
extension = Path.GetExtension(file1.PostedFile.FileName).ToLower()
SyncLock (objLock)
'get the max id from the database
maxId = (objclass.GetMaxId())
filename = maxId & extension
strImagePath = rootPath & ConfigurationManager.AppSettings("ACTUAL_PATH") & filename
End SyncLock
If Not Directory.Exists(rootPath & ConfigurationManager.AppSettings("ACTUAL_PATH")) Then
Directory.CreateDirectory(rootPath & ConfigurationManager.AppSettings("ACTUAL_PATH"))
End If
objprice.photograph = filename
file1.PostedFile.SaveAs(strImagePath)
If File.Exists(strImagePath) Then
Dim actualImage As Drawing.Image
Dim mediumImage As Drawing.Image = Nothing
Dim thumbImage As Drawing.Image = Nothing
actualImage = Drawing.Image.FromFile(strImagePath)
'------------- Medium Image --------------------
Dim mediumWidth As Integer = ConfigurationManager.AppSettings("MEDIUM_WIDTH")
Dim mediumHeight As Integer = ConfigurationManager.AppSettings("MEDIUM_HEIGHT")
mediumImage = GeneralMethods.CreateThumbImage(actualImage, mediumWidth, mediumHeight)
If mediumImage.Width > mediumWidth Then
mediumImage = mediumImage.GetThumbnailImage(mediumWidth, mediumImage.Height, New Drawing.Image.GetThumbnailImageAbort(AddressOf ThumbnailCallback), IntPtr.Zero)
End If
If mediumImage.Height > mediumHeight Then
mediumImage = mediumImage.GetThumbnailImage(mediumImage.Width, mediumHeight, New Drawing.Image.GetThumbnailImageAbort(AddressOf ThumbnailCallback), IntPtr.Zero)
End If
If mediumImage IsNot Nothing Then
mediumImage.Save(rootPath & ConfigurationManager.AppSettings("MEDIUM_PATH") & filename)
End If
mediumImage.Dispose()
actualImage.Dispose()
'------------- End Medium --------------------
actualImage = Drawing.Image.FromFile(strImagePath)
'--------------- Thumb Image -----------------
Dim thumbWidth As Integer = ConfigurationManager.AppSettings("THUMB_WIDTH")
Dim thumbHeight As Integer = ConfigurationManager.AppSettings("THUMB_HEIGHT")
thumbImage = GeneralMethods.CreateThumbImage(actualImage, thumbWidth, thumbHeight)
If thumbImage.Width > thumbWidth Then
thumbImage = thumbImage.GetThumbnailImage(thumbWidth, thumbImage.Height, New Drawing.Image.GetThumbnailImageAbort(AddressOf ThumbnailCallback), IntPtr.Zero)
End If
If thumbImage.Height > thumbHeight Then
thumbImage = thumbImage.GetThumbnailImage(thumbImage.Width, thumbHeight, New Drawing.Image.GetThumbnailImageAbort(AddressOf ThumbnailCallback), IntPtr.Zero)
End If
If thumbImage IsNot Nothing Then
thumbImage.Save(rootPath & ConfigurationManager.AppSettings("THUMB_PATH") & filename)
End If
thumbImage.Dispose()
'------------- End Thumb Image -----------------
actualImage.Dispose()
End If
End If
Private Function ThumbnailCallback() As Boolean
Return False
End Function
according to the requirements set the application setting of the web.config.
hope this will help you
enjoy coding…..
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