在C＃中加载1 mb的tga文件时获取OutOfMemoryException

Question

I don't know what the problem is exactly. I can load small jpeg files, but when I tried loading a tga file, I get the exception. I tried resizing the image but that didn't help either.

public static System.Drawing.Image resizeImage(System.Drawing.Image imgToResize, Size size)
{
    return (System.Drawing.Image)(new Bitmap(imgToResize, size));
}

private void imageToolStripMenuItem4_Click(object sender, EventArgs e)
{

    if (tabControl1.TabCount == 0)
    {
        MessageBox.Show("Please add a form first");
        return;
    }

    OpenFileDialog openFileDialog1 = new OpenFileDialog();
    openFileDialog1.Filter = "TGA (*.tga)|*.tga|JPEG (*.jpg)|*.jpg|BITMAP FILES (*.bmp)|*.bmp|PNG (*.png)|*.png";
    openFileDialog1.FilterIndex = 1;

    if (System.Windows.Forms.DialogResult.OK == openFileDialog1.ShowDialog())
    {
        BckImageRadioBtnGrp bimrbg=new BckImageRadioBtnGrp();
        bimrbg.ShowDialog();

        string result = bimrbg.getResult();

        if (result != null)
        {
            switch (result)
            {
                case "Center"   : (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImageLayout = ImageLayout.Center;   break;
                case "Zoom"     : (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImageLayout = ImageLayout.Zoom;     break;
                case "Tile"     : (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImageLayout = ImageLayout.Tile;     break;
                case "Stretch"  : (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImageLayout = ImageLayout.Stretch;  break;
                case "None"     : (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImageLayout = ImageLayout.None;     break;
            }
        }

         //getting exception here. I set a small resizing size just for testing if it works. it doesn't
        System.Drawing.Image img = resizeImage(System.Drawing.Image.FromFile(openFileDialog1.FileName), new Size(100, 100));

        (GetDesignSurface(tabControl1.SelectedTab) as System.Windows.Forms.UserControl).BackgroundImage = img;
        }
}
}

}

So, the question is, how do I load an image?

Answer 1

OutOfMemoryException is the typical way of System.Drawing.Image.FromFile to reject an unloadable file, eg corrupted file or unsupported pixel format, etc. The exception is quite confusing and probably related to GDI+. The size of file doesn't matter at all.

See exception section on this MSDN page : http://msdn.microsoft.com/en-us/library/stf701f5.aspx

If the problem occurs on a single image, you can try to re-save the image with a more permissive graphic design tool (if you can open it !), or you can try another picture handling library than native .Net methods, which doesn't rely on GDI+.

AFAIK, most of the time when the exception occurs there is no direct simple solution to "force" the loading of the picture.