how to get the image width and height! argh

Question

User249648003 posted

Hi all,

I am trying to get the image height and width of an image I have obtained from a database and downloaded to an aspx page.

I know I need to use something like:

Dim Imagex As System.Drawing.Image = System.Drawing.Image.FromFile("~/RegisteredUsers/ShowPicture1.aspx")

to declare the image but when I do it this way I get the following error

Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

So I figured it had somthing to do with not using the physical path.

So I got the physical path like this:

Dim physicalpath As String = Server.MapPath("~/RegisteredUsers/ShowPicture1.aspx")

Then I go:

Dim Imagex As System.Drawing.Image = System.Drawing.Image.FromFile(physicalpath)

When I do it like this I get a different error:

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.OutOfMemoryException: Out of memory.

So now I am lost, can anyone in the know help me on this?

Thanks.

Answer 1

User1955095561 posted

try this:

FileStream fs = new FileStream(MapPath(ImageFolder + "/" + fileName),
          FileMode.Open, FileAccess.Read, FileShare.Read);
        
        System.Drawing.Image image = System.Drawing.Image.FromStream(fs)

try
        {
          fileLength = Convert.ToInt32(fs.Length);
          fileWidth = image.Width;
          fileHeight = image.Height;
        }
catch(Exception ex)

{}

 

Hope this helps.

Answer 2

User249648003 posted

I am sorry, can you please put that in VB?

Answer 3

User249648003 posted

Someone please help this is my code how do I get the image height and width so I can resize, also how do I resize??

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Dim ListingID As String = (Request.QueryString("GUID"))

'Connect to the database and bring back the image contents & MIME type for the specified picture

Using myConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionStringListings").ConnectionString)

Const SQL As String = "SELECT [Pic1Ext], [Picture1] FROM [Listings] WHERE [ListingID] = @ListingID"

'Const SQL As String = "SELECT [Pic1Ext], [Picture1] FROM [Listings] "

Dim myCommand As New SqlCommand(SQL, myConnection)myCommand.Parameters.AddWithValue("@ListingID", ListingID)

myConnection.Open()

Dim myReader As SqlDataReader = myCommand.ExecuteReader

If myReader.Read Then

Response.ContentType = myReader("Pic1Ext").ToString()

Response.BinaryWrite(myReader("Picture1"))

End If

myReader.Close()

myConnection.Close()

End Using

End Sub

Answer 4

User1955095561 posted

try out the code on this post to resize the image and also to get the width and the height.

http://forums.asp.net/t/1259488.aspx

also there is a link posted by me in this thread. That might also be helpful to you.
 

 

Hope it helps 

Answer 5

User249648003 posted

I got it, but I think I did it the hard way. But if anyone has the same problem, here is the solution I came up with.

 

'******Connect to the database and bring back the main image Information******

'******Resize the Image

Using myConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionStringListings").ConnectionString)

Const SQL As String = "SELECT [Pic1Ext], [Picture1] FROM [Listings] WHERE [ListingID] = @ListingID"

Dim myCommand As New SqlCommand(SQL, myConnection)myCommand.Parameters.AddWithValue("@ListingID", StringGuid)

myConnection.Open()

Dim myReader As SqlDataReader = myCommand.ExecuteReader

If myReader.Read Then

 

End If

Dim MainImage() As Byte

MainImage = (CType(myReader.Item("Picture1"), Byte()))

Dim MainMS As New System.IO.MemoryStream(MainImage)

Dim origimage As System.Drawing.Image

origimage = System.Drawing.Image.FromStream(MainMS)

Dim OriginalWidth As Int16 = origimage.Width

Dim OriginalHeight As Int16 = origimage.Height

Dim SpaceHeight As Int16 = MainHeight

Dim SpaceWidth As Int16 = MainWidth

Dim PercentWidth As Decimal = (SpaceWidth / OriginalWidth)

Dim PercentHeight As Decimal = (SpaceHeight / OriginalHeight)

Dim nPercent As Decimal

If PercentWidth < PercentHeight Then

nPercent = PercentWidth

Else

nPercent = PercentHeight

End If

Image1.Width = origimage.Width * nPercent

Image1.Height = origimage.Height * nPercent

myReader.Close()

myConnection.Close()

 

End Using

Answer 6

User-1171043462 posted

Hi Do this way

Bitmap bmp = new Bitmap(Server.MapPath("images/1.jpg"));

int height = bmp.Height;

int width = bmp.Width;

Answer 7

User486328453 posted

It is actually even simpler than that.

Public Function GetImageWidth(ByVal ImgFile As String) As Integer
        Dim newImage As Image = Image.FromFile(ImgFile)
        Return newImage.Width
End Function

Then simply call the function from the page like so.

<%If GetImageWidth(Server.MapPath("Photos\RSites\" & drRSites.Item("saLogo"))) > 200 Then%>

or in whatever format you may need.

Hope this is useful.

 

Answer 8

User-519136805 posted

http://aliraza.wordpress.com/2008/02/05/how-to-get-uploaded-image-dimensions-in-aspnet/