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POHow to find whether a file is still being streamed?
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  1. POHow to find whether a file is still being streamed?
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    copied!<p>I am writing a small program to automatically change the desktop wallpaper, from an online image gallery (imgur). Currently I have this code:</p> <pre><code>namespace Imgur_Wallpapers { public partial class Form1 : Form { //IMGUR API = 3f1e4339e7bad35ff801bf76e369ae17 private int Count = 1; public Form1() { InitializeComponent(); timer1.Enabled = false; if (!File.Exists("image_black")) { Bitmap black = new Bitmap(10, 10); black.Save("transitionpaper.bmp"); } } private void Form1_Load(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { DownloadFromImgur download = new DownloadFromImgur("gjZEc", Path.GetDirectoryName(Application.StartupPath)); Wallpaper.Set(new Uri(Application.StartupPath + "/Image.bmp"), Wallpaper.Style.Centered); Count++; } private void timer1_Tick(object sender, EventArgs e) { DownloadFromImgur download = new DownloadFromImgur(imgurAlbumIdBox.Text, Path.GetDirectoryName(Application.StartupPath)); Wallpaper.Set(new Uri(Application.StartupPath + "/Image.bmp"), Wallpaper.Style.Centered); Count++; } private void button2_Click(object sender, EventArgs e) { timer1.Interval = (int)whenToRefreshBox.Value; timer1.Enabled = true; } } private string url; public List&lt;string&gt; hash; private Random random; private string albumID; public DownloadFromImgur(string albumID, string folderToSaveTo) { try { this.albumID = albumID; hash = new List&lt;string&gt;(); random = new Random(); GetWebSite(); Wallpaper.Set(new Uri(Application.StartupPath + "/transitionpaper.bmp"), Wallpaper.Style.Centered); WebClient client = new WebClient(); File.Delete(Application.StartupPath + "/Image.bmp"); client.DownloadFile(url, Application.StartupPath + "/Image.bmp"); client.Dispose(); } catch (WebException ex) { } } private void GetWebSite() { var doc = XDocument.Load("http://api.imgur.com/2/album/" + albumID); hash.Clear(); RecursiveWrite(doc.Root); url = hash[random.Next(hash.Count - 1)]; } private void RecursiveWrite(XElement node) { foreach (var attribute in node.Value) { if (node.Name == "original") { hash.Add(node.Value); break; } } foreach (var child in node.Elements()) { RecursiveWrite(child); } } } public sealed class Wallpaper { Wallpaper() { } const int SPI_SETDESKWALLPAPER = 20; const int SPIF_UPDATEINIFILE = 0x01; const int SPIF_SENDWININICHANGE = 0x02; [DllImport("user32.dll", CharSet = CharSet.Auto)] static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni); public enum Style : int { Tiled, Centered, Stretched } public static void Set(Uri uri, Style style) { System.IO.Stream s = new System.Net.WebClient().OpenRead(uri.ToString()); System.Drawing.Image img = System.Drawing.Image.FromStream(s); string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp"); img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp); RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true); if (style == Style.Stretched) { key.SetValue(@"WallpaperStyle", 2.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Centered) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Tiled) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 1.ToString()); } SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, tempPath, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE); } } } </code></pre> <p>It works fine when on the first run, but returns an IOException on the second run. Apparently the file is still being used somewhere. How can I find where it's still used? Here's the exception message:</p> <blockquote> <p>System.IO.IOException was unhandled<br> Message=The process cannot access the file 'C:\Users\David\documents\visual studio 2010\Projects\Imgur Wallpapers\Imgur Wallpapers\bin\Debug\Image.bmp' because it is being used by another process.<br> Source=mscorlib<br> StackTrace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path)</p> </blockquote>
 

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