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ASP.NET - Resize image code help

I'm trying to take a file on the webserver in:
"e:\web\htdocs\profile\myimage.jpg"
and have it resized using .NET Native ASP code.

I"m pretty sure this is the proper code, my problem is I dont know how to finish off this file. I need the completed .aspx file to make this function. Should be easy.

// Load Image (any image format!)from file
System.Drawing.Image img = System.Drawing.Image.FromFile(fileName);


// Resize Image (and constrain proportions!)
System.Drawing.Size size = CalculateNewWidthAndHeight(img.Width, img.Height);
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(80, 80);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp);
g.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.White), 0, 0, 80, 80);
g.DrawImage(img, (80 - size.Width) / 2, (80 - size.Height) / 2, size.Width, size.Height);


// Output to Disk (and reload from disk)
System.Drawing.Imaging.EncoderParameters p = new System.Drawing.Imaging.EncoderParameters(1);
p.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 90L);
bmp.Save(fileName2, GetEncoderInfo("image/jpeg"), p);
g.Dispose();
bmp.Dispose();
img.Dispose();
img = System.Drawing.Image.FromFile(fileName2);


// Output to browser
Response.ContentType = "image/jpeg";
img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
img.Dispose();






/// <summary>Calculates new height and width based on height and width restrictions.</summary>
private System.Drawing.Size CalculateNewWidthAndHeight(int width, int height) {
float resize = (float)Math.Max(width, height) / 80f; // will constrain to 80x80
return new System.Drawing.Size((int)(width / resize), (int)(height / resize));
}

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rajeeshmca

what is the problem with ur code?

entryg

You have to explicitly end your response by adding Response.End() after resizing image.

Below is the complete code listing for resizing the image.

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

Private Sub GetResizedImage()

End Sub

Private Sub GetResizedImage(ByVal imageName As String)
            Dim filename As String
            filename = Server.MapPath(imageName)
            Try
                oImgOriginal = System.Drawing.Image.FromFile(filename)
                'fetch user supplied filename
                'maintain aspect ratio and also fit thumbnail into frame
                imgWidth = oImgOriginal.Width
                'get original image width and height
                imgHeight = oImgOriginal.Height
                'maintain aspect ratio
                If imgWidth > 200 AndAlso imgHeight > 150 Then
                    widthProportion = (imgWidth / frameWidth)
                    heightProportion = (imgHeight / frameHeight)
                    Dim f As Single = Math.Max(widthProportion, heightProportion)
                    If (f < 1) Then
                        f = 1
                    End If
                    thumbWidth = CType((imgWidth / f), Integer)
                    thumbHeight = CType((imgHeight / f), Integer)
                    'generate thumbnail
                    oImgThumbNail = oImgOriginal.GetThumbnailImage(thumbWidth, thumbHeight, Nothing, pointer)
                    'Sending Response gif type to the browser. 
                    Response.ContentType = "image/jpg"
                    oImgThumbNail.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)
                Else
                    oImgThumbNail = oImgOriginal.GetThumbnailImage(imgWidth, imgHeight, Nothing, pointer)
                    Response.ContentType = "image/jpg"
                    oImgThumbNail.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)

                End If
                'Disposing the objects.
                oImgOriginal.Dispose()
                oImgThumbNail.Dispose()

            Catch e As Exception
                Throw e
            End Try


End Sub

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FeverCanada

ASKER

Is it possible to have an on-demand view that doesn't save the thumbnail?

FeverCanada

ASKER

Hi there, can you show me how to call the sub also... I'm still a little cloudy on that part.

ASKER CERTIFIED SOLUTION

entryg

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FeverCanada

ASKER

Thanks finally got it :)