lesnotip.blogg.se - Force windows to generate thumbnails

When talking to the shell (Windows Explorer), you want to make sure your process runs at the same UAC level than the shell otherwise, for security reasons, some operations will fail.

PDF files requires the whole Adobe Reader.

For performance reasons, you can cache the factories.

The GetImage method has various interesting flags ( SIIGBF) you can play with.

Int GetImage( Size size, SIIGBF flags, out IntPtr phbm) Private static extern int SHCreateItemFromParsingName( string path, IntPtr pbc, Guid riid, out IShellItemImageFactory factory) Hr = factory.GetImage(size, flags, out bmp) Int hr = SHCreateItemFromParsingName(filePath, IntPtr.Zero, typeof(IShellItemImageFactory).GUID, out factory) TODO: you might want to cache the factory for different types of files // as this simple call may trigger some heavy-load underground operations

Throw new ArgumentNullException( "filePath") Public static Bitmap ExtractThumbnail( string filePath, Size size, SIIGBF flags) string path = (Bitmap bmp = ExtractThumbnail(path, new Size( 1024, 1024), SIIGBF.SIIGBF_RESIZETOFIT))īmp.Save( "whatever.png", ImageFormat.Png) you can use any type of file supported by your windows installation. It's based on the cool IShellItemImageFactory interface: static void Main( string args) Here is a piece of code that extracts thumbnail bitmaps (using Windows Vista or higher only). See How do I refresh a file's thumbnail in Windows Explorer? question and code snippet for potential clues. Not registered (Exception from HRESULT: 0x80040154 There was a problem in extracting the thumbnail for this specific The current ShellObject does not have a valid thumbnail handler or However, I'm getting an exception in case thumbnail is not there yet: = ShellThumbnailFormatOption.ThumbnailOnly It is possible to force thumbnail retrieval by adding FormatOption: ShellFile shellFile = ShellFile.FromFilePath(fullPathToFile) How can my program force Windows 7 to generate real thumbnails before using them? This means that I have to manually open a folder, wait for Windows to generate thumbnails for each file, and then my application will be able to see those thumbs. I've found out that the real thumbnail is only shown if Windows had previously generated the thumbnail for that file and stored it in the thumbnails cache. Sometimes, the thumbnail shown is merely the 'default application' icon. Then, I use the following code: ShellFile shellFile = ShellFile.FromFilePath(fullPathToFile) First, I reference the Windows API Code pack. To obtain the thumbnail, I've recurred to a method posted in a different question. Whenever you click any item in the list, a small PictureBox next to it should show the thumbnail of the corresponding file. I have made an application that presents you a list of files in your computer.