Question

File Upload Validation

Asked by: rock815

I'm creating a small photo gallery app and I want to validate the file so that only JPEG or GIF files can be uploaded.  Can you guide me to how to do this?  I would like to use the CustomValidator if possible, but if not, I just need guidance...  A URL would be nice as a reference if available, I couldn't find anyting on Google

In case you need to know, I'm currently using System.IO.Stream to read the file and upload it into sql server database table

Thanks for your help in advance!

Happy New Year...

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Asked On
2004-12-30 at 09:57:23ID21257622
Tags

file

,

upload

,

validation

Topic

Programming for ASP.NET

Participating Experts
3
Points
500
Comments
6

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Answers

 

by: ayha1999Posted on 2004-12-30 at 10:31:03ID: 12927737

<input type="file" runat="server" id="fileUpload" />

-------Code behind file-> function for uploading image------
using System.IO;
void ImageUpload()
{
       // Create posted file object :
        HttpPostedFile filePosted = fileUpload.PostedFile;
     
  if(File.Exists(fileUpload.PostedFile))
       {
       if (filePosted.ContentType.IndexOf("image") >= 0) //check if its imageFile:
          {    
        string strFileName = Path.GetFileName(filePosted.FileName);
        string strTarget = Server.MapPath("images") + "\\" + strFileName;      

        filePosted.SaveAs(strTarget);//Save image ot server
        }
     }
}

Make sure you have set Write permission for ASP.NET user on production server to write into "images" folder.

ayha1999

 

by: rock815Posted on 2004-12-30 at 10:36:44ID: 12927782

How would I tie this to the Custom Control Validator?  Or is that even possible?

 

by: ayha1999Posted on 2004-12-30 at 10:48:31ID: 12927900

You don't need to use custom validator. you can delcare a boolean variable and make it true if validation pass and then do what u want (insert into folder).

ayha

 

by: AerosSagaPosted on 2004-12-30 at 10:50:35ID: 12927921

You could use a regular expression like the one here:

http://www.regexlib.com/REDetails.aspx?regexp_id=259

or

Check for the files extension and then proceed accordingly, heres a snippit of one of my image resizing classes to give you an idea of how this would be done.

    Public Function ResizeImage(ByVal ImageSource As String) As String
        Dim IncomingImage As System.Drawing.Image
        Dim OutputBitmap As Bitmap
        Dim JpegCodec As ImageCodecInfo
        Dim JpegEncodeParams As EncoderParameters
        Dim NewSize As Size
        Dim fiSource As New IO.FileInfo(ImageSource)
        Dim fsSource As IO.FileStream
        Dim fiDestination As New IO.FileInfo(ImageSource)
        Dim NewFilename As String
        fiSource.MoveTo(fiSource.DirectoryName & "\TEMP_" & fiSource.Name)
        fsSource = fiSource.OpenRead()
        IncomingImage = IncomingImage.FromStream(fsSource)
        OutputBitmap = RedrawImage(IncomingImage, FullSizeX, FullSizeY)
        If fiSource.Extension = ".gif" Then
            NewFilename = fiDestination.Name
            OutputBitmap.Save(fiDestination.FullName)
        Else
            JpegCodec = ReturnJpegCodec()
            JpegEncodeParams = ReturnEncoderParams()
            NewFilename = fiDestination.Name.Replace(fiDestination.Extension, ".jpg")
            OutputBitmap.Save(fiDestination.FullName.Replace(fiDestination.Extension, ".jpg"), _
                JpegCodec, JpegEncodeParams)
        End If
        fsSource.Close() ''''This may have done it check on wednesday
        'This is causing the generic GDI+ exception
        If CreateThumbnail Then
            OutputBitmap = RedrawImage(IncomingImage, ThumbX, ThumbY)
            If fiSource.Extension = ".gif" Then
                OutputBitmap.Save(fiDestination.DirectoryName & "/Thumbnails/" & fiDestination.Name)
            Else
                JpegCodec = ReturnJpegCodec()
                JpegEncodeParams = ReturnEncoderParams()
                OutputBitmap.Save(fiDestination.DirectoryName & "/Thumbnails/" & _
                    fiDestination.Name.Replace(fiDestination.Extension, ".jpg"), JpegCodec, JpegEncodeParams)
            End If
        End If
        OutputBitmap.Dispose()
        IncomingImage.Dispose()
        fiSource.Delete()
        Return NewFilename
    End Function

 

by: AerosSagaPosted on 2004-12-30 at 10:52:00ID: 12927928

The regular expression is for the built in ASP.NET regular expresssion validator, I assume you would know that but often assuming here makes an A-S-S of U-M-E

 

by: maulikCEPosted on 2004-12-30 at 13:56:45ID: 12929075

1) Client - Side Validation

You can use the following regular expression validator for file  upload validation:

 <asp:RegularExpressionValidator runat="server"
ErrorMessage="Only picture files are allowed!"
ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.gif|.GIF|.jpg|.JPG|.jpeg|.JPEG)$"
ControlToValidate="fileUpload" Display="None"></asp:RegularExpressionValidator>

2) Server Side Validation
If you want to use Server side validation( As validators dont work in fastest FIREFOX browser) then Use server side checking.....

 // Create posted file object :
private bool IsValidImageFile()
{
   HttpPostedFile filePosted = fileUpload.PostedFile;
 //check if its imageFile:    
  if (filePosted.ContentType.IndexOf("image") >= 0)
  {return true; }
   else
   { return false; }
}

3) How to use custom validator:
http://dotnetjunkies.com/WebLog/hussein/archive/2004/11/26/33768.aspx

4) Uploade file to SqlServer:
Theres a nice article on what are trying to do, Please do refere this...
http://www.codeproject.com/cs/database/UploadPicturesSQLServer.asp

Cheeers!!!!
Maulik_M_Modi

20120131-EE-VQP-002

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