DrawImage Parameter Is Not Valid?!

Question

Okay, so here is the crux. I'm trying to manipulate an image a bit using Graphics.DrawImage. I've created a nice method to call for any new manipulation. The code looks as follows;

                Image img = _SomeImage;
                Bitmap bmp = new Bitmap(this.Width + widthAddon, this.Height, PixelFormat.Format32bppArgb);
                PointF[] destPoints = { new PointF(changeableValueA, 0), new PointF(this.Width, 0), new PointF(changeableValueB, this.Height) };
                Graphics graphics = Graphics.FromImage(bmp);
                graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
                graphics.DrawImage(img, destPoints);
                img.Dispose();
                graphics.Dispose();

The code works fine, the first time, but whenever I make yet another call to this function I get "Parameter Is Not Valid" exception. So the first time works, the second makes it all crash... what to do, any clues?!

 

Regards.

Answer 1

Hi,

if _Someimage is a class-level/scope variable, this will fail after one successful run because you dispose the image at the end:

img.Dispose();

and img is pointing to the _someimage picture, so this will get disposed.

Either dont dispose img (and properly dispose _someimage when the form closes or so) or create a temporary copy

using (Image img = (Image)_SomeImage.Clone())
{
    //... your code here
}

Answer 2

Hello Luntar

I hope this problem is coming due to graphics.Dispose();

so test this code

 Image img = _SomeImage;
        Bitmap bmp = new Bitmap(this.Width + widthAddon, this.Height, PixelFormat.Format32bppArgb);
        PointF[] destPoints = { new PointF(changeableValueA, 0), new PointF(this.Width, 0), new PointF(changeableValueB, this.Height) };
        Graphics graphics = Graphics.FromImage(bmp);
        graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
        graphics.DrawImage(img, destPoints);
        img.Dispose();
       // graphics.Dispose();
        bmp.Dispose();

 

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