Question

unload and delete files

Asked by: ingprokop

hi experts,

in my program I'm loading pictures from files into an array. then I'm stitching them together and saving as a single picture file. after that I need to delete the single files but thez remain locked (apparently because of loading into the array). how can I unlock those files to be able to delete them from the folder?

thanks in advance

d.

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Asked On
2009-07-29 at 01:28:47ID24608743
Topic

C# Programming Language

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: Rahu_ketu_patalPosted on 2009-07-29 at 01:34:43ID: 24968095


The Bitmap constructor that takes a file path will hold a lock on the image file that you are loading for the life of that bitmap. If you call dispose on the bitmap before disposing of the picture box you will get an exception. If you want to load an image from the filesystem without holding a lock on the file you should use the following code:
         try
        {
           Image image = null;
           using( Stream s = new FileStream( sourceImageFile, FileMode.Open ) )
            {
              image = Image.FromStream(s);
              s.Close();
           }
           picturebox.Image = image;
        }
        catch
        {
            // Log the error
        }
It is worth noting that this will throw an exception if the file you are trying to open is readonly. To avoid this you should use the FileStream overload which takes a file access mode and set it to FileAccess.Read

 

by: DhaestPosted on 2009-07-29 at 01:34:49ID: 24968097

Can you show the code that you are using currently. Are all your streams to all  your files closed ?

 

by: ingprokopPosted on 2009-07-29 at 01:45:01ID: 24968170

here is a part of the code where I'm loading the images, stitching them and on the end deleting them...(or at least trying to)

           DirectoryInfo fileInfo = new DirectoryInfo(Transfer_Data.Directory + "\\Buffer");
            FileInfo[] bmpInfo = fileInfo.GetFiles("*.bmp");
            int side = Convert.ToInt32(Math.Sqrt(bmpInfo.Length));

            Image[] images = new Image[bmpInfo.Length];
            for (int index = 0; index < bmpInfo.Length; index++)
            {
                images[index] = Image.FromFile(Transfer_Data.Directory + "\\Buffer\\" + bmpInfo[index].Name);
            }

            Image newBmp = new Bitmap(width * side, height * side);
            //renderImg.renderedImageBox.Size = new Size(width * side, height * side);
            //renderImg.renderedImageBox.Image = newBmp;

            for (int i = 0; i < bmpInfo.Length; i++)
            {
                Image destBmp = newBmp; //renderImg.renderedImageBox.Image;
                Image srcBmp = images[i];
                int Y = (side - 1) - Convert.ToInt32(Math.Floor(Convert.ToDouble(i / side)));
                int X = i - (Convert.ToInt32(Math.Floor(Convert.ToDouble(i / side))) * side);

                Graphics graphics = Graphics.FromImage(destBmp);
                graphics.DrawImage(srcBmp, width * X, height * Y, srcBmp.Width, srcBmp.Height);

                newBmp = destBmp;
                //renderImg.renderedImageBox.Image = destBmp;
            }

            Image original = newBmp; //renderImg.renderedImageBox.Image;
            int resizedW = Convert.ToInt32(renderSetup.widthRes.Value);
            int resizedH = Convert.ToInt32(renderSetup.heightRes.Value);
            Image resized = new Bitmap(original, resizedW, resizedH);
            //renderImg.renderedImageBox.Image = resized;

            resized.Save(Transfer_Data.bmpFileName, System.Drawing.Imaging.ImageFormat.Bmp);

            string[] filePaths = Directory.GetFiles(Transfer_Data.Directory + "\\Buffer");
            foreach (string filePath in filePaths)
                File.Delete(filePath);

 

by: Rahu_ketu_patalPosted on 2009-07-29 at 01:47:01ID: 24968181

Image[] images = new Image[bmpInfo.Length];
            for (int index = 0; index < bmpInfo.Length; index++)
            {
 
using( Stream s = new FileStream( Transfer_Data.Directory + "\\Buffer\\" + bmpInfo[index].Name, FileMode.Open ) ) 
            {
              images[index]= Image.FromStream(s);
              s.Close();
           }
 
}
                                              
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by: ingprokopPosted on 2009-07-29 at 01:48:23ID: 24968190

aha, so first I need to close the stream and then delete the files...?

 

by: Rahu_ketu_patalPosted on 2009-07-29 at 01:49:11ID: 24968196

yeah! you need to..coz otherwise the files will hv the lock.

 

by: ingprokopPosted on 2009-07-29 at 01:52:12ID: 24968207

thanks a lot

 

by: ingprokopPosted on 2009-07-29 at 01:54:38ID: 24968231

I think I'm doing something wrong. do I need to add your code before deleting the files?

 

by: ingprokopPosted on 2009-07-29 at 02:13:52ID: 24968330

I made it, I was loading the images twice and closed allways the second one...

20120131-EE-VQP-002

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