Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Resizing multiple images runs out of memory

Posted on 2008-10-07
3
Medium Priority
?
843 Views
Last Modified: 2012-05-05
Hi all,

Below is a function that I wrote that resizes images for a website. After it processes about 250 images, I run out of memory, leading me to believe that my dispose isn't working? There are 900 photos to process total. What have I missed?
Function resizeImage(ByVal imageName As String, ByVal newWidth As Integer, ByVal imageType As String, ByVal homeDirectory As String) As String
 
        Dim originalFileName As String
        Dim newFileName As String
        Dim tmpImage As Drawing.Bitmap
        Dim newImage As Drawing.Bitmap
        Dim g As Graphics
        Dim newHeight As Integer
 
        originalFileName = pickupFolder & imageName
        If File.Exists(originalFileName) = True Then
            Try
                tmpImage = New Bitmap(Bitmap.FromFile(originalFileName))
                newHeight = (newWidth * tmpImage.Height) / tmpImage.Width
 
                newImage = New Bitmap(newWidth, newHeight)
                g = Graphics.FromImage(newImage)
 
 
                ' draw it with the new size
                g.DrawImage(tmpImage, 0, 0, newWidth, newHeight)
 
                newFileName = imageType & Replace(imageName, " ", "")
                newImage.Save("c:\inetpub\wwwroot\" & homeDirectory & "\photos\" & newFileName, Drawing.Imaging.ImageFormat.Jpeg)
                g.Dispose()
                newImage.Dispose()
                tmpImage.Dispose()
 
                tmpImage = Nothing
                newImage = Nothing
                g = Nothing
 
                resizeImage = newFileName
 
            Catch ex As Exception
 
                streamWriter.WriteLine(originalFileName & " gave error: " & ex.Message)
                Console.WriteLine(originalFileName & " gave error: " & ex.Message)
 
            End Try
 
        Else
            streamWriter.WriteLine(originalFileName & " does not exist")
            Console.WriteLine(originalFileName & " does not exist")
        End If
 
        tmpImage = Nothing
        newImage = Nothing
        g = Nothing
 
    End Function

Open in new window

0
Comment
Question by:DEWebWorks
  • 2
3 Comments
 
LVL 14

Accepted Solution

by:
rachitkohli earned 2000 total points
ID: 22658453
I would suggest making an image from the file using file stream object.

Dim fs as IO.FileStream
fs=new IO.FileStream("FILEPATH", ACCESSTYPE)
fs.close

tmpImage=Bitmap.FromStream(fs)

'Please check for the syntax, as am directly typing here without testing it...
0
 

Author Closing Comment

by:DEWebWorks
ID: 31503786
Very nice! Thanks.
0
 

Author Comment

by:DEWebWorks
ID: 22658504
Here's the final code:

    Function resizeImage(ByVal imageName As String, ByVal newWidth As Integer, ByVal imageType As String, ByVal homeDirectory As String) As String
 
        Dim originalFileName As String
        Dim newFileName As String
        Dim tmpImage As Drawing.Bitmap
        Dim newImage As Drawing.Bitmap
        Dim g As Graphics
        Dim newHeight As Integer
 
        '---
        Dim fs As IO.FileStream
        '---
 
        originalFileName = pickupFolder & imageName
        If File.Exists(originalFileName) = True Then
            Try
                'tmpImage = New Bitmap(Bitmap.FromFile(originalFileName))
                '---
                fs = New IO.FileStream(originalFileName, FileMode.Open)
 
                tmpImage = Bitmap.FromStream(fs)
                fs.Close()
                '---
 
                newHeight = (newWidth * tmpImage.Height) / tmpImage.Width
 
                newImage = New Bitmap(newWidth, newHeight)
                g = Graphics.FromImage(newImage)
 
 
                ' draw it with the new size
                g.DrawImage(tmpImage, 0, 0, newWidth, newHeight)
                g.Dispose()
 
                newFileName = imageType & Replace(imageName, " ", "")
                newImage.Save("c:\inetpub\wwwroot\" & homeDirectory & "\photos\" & newFileName, Drawing.Imaging.ImageFormat.Jpeg)
 
                newImage.Dispose()
                tmpImage.Dispose()
 
                tmpImage = Nothing
                newImage = Nothing
                g = Nothing
 
                resizeImage = newFileName
 
            Catch ex As Exception
 
                streamWriter.WriteLine(originalFileName & " gave error: " & ex.Message)
                Console.WriteLine(originalFileName & " gave error: " & ex.Message)
 
            End Try
 
        Else
            streamWriter.WriteLine(originalFileName & " does not exist")
            Console.WriteLine(originalFileName & " does not exist")
        End If
 
        tmpImage = Nothing
        newImage = Nothing
        g = Nothing
 
    End Function

Open in new window

0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you're writing a .NET application to connect to an Access .mdb database and use pre-existing queries that require parameters, you've come to the right place! Let's say the pre-existing query(qryCust) in Access takes a Date as a parameter and l…
It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
Want to learn how to record your desktop screen without having to use an outside camera. Click on this video and learn how to use the cool google extension called "Screencastify"! Step 1: Open a new google tab Step 2: Go to the left hand upper corn…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Suggested Courses

824 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question