silverlight - file extensions - c#

I am working on a file explorer using Silverlight OOB. I need a way to get and display the icon associated with each file in my application. Note, I only need to show the icons, I donĀ“t need to open the files.

If I understood you right, you're building something like Windows Explorer and want to mimic its list view by showing the program icons right before their names.
I'm not sure whether OOB has access to the System.Drawing.Icon class, but if so, you can use the following code to get the icon for any given file:
Bitmap icon = System.Drawing.Icon.ExtractAssociatedIcon(filename).ToBitmap();
If not, the only way you can do it is by storing the icons for most common file formats in a dictionary and retrieving them from there based upon file extension.

Related

How does Windows Photo Viewer get the files for the slideshow from Windows Explorer?

I wrote an image viewer application in C# to replace Windows 7 Photo Viewer which does not have the one feature I needed, which was to set the ratings and keywords directly from the view screen and not by opening some less user-friendly property pages. It works Ok for my need, but I wanted to improve it with a slideshow.
With Windows 7 Photo Viewer, what I usually did was I set the keywords of the picture, I used Windows Explorer "organize by" feature, clicked one keyword, double-clicked one file and run the slideshow from there.
But when I double-click a file from the keyword-"organized" folder in Windows Explorer, all my app gets is the command-line argument, i.e. the full name of the file.
I could admit running my slideshow from there, using System.IO.Path.GetDirectoryName to get all files from the folder, but I find it lacks a certain "panache", don't you think?
I am not asking for code here. But could someone just point me in the right direction, please? I don't know what WindowsExplorer actually gives PhotoViewer that allows it to only show the required files. And why.
Thanks for any help.
When you use Organize by feature of Windows Explorer it creates special virtual folder. And this folder contains files with selected keyword only. Mechanism of opening of PhotoViewer differs from standard way. If you open HKEY_CLASSES_ROOT\jpegfile\shell\open registry key you will see that where is DropTarget subkey. It means when you double-clicked the file shell creates inproc com server with CLSID from DropTarget subkey and pass virtual path of image to IDropTarget instance. So PhotoViewer work with list of virtual objects instead of physical directory.

Get Outlook folders icons

I am building an add-in which requires selection of multiple outlook folders. For that purpose I created selection dialog that lists folders and allows user to select one or more by checking the check boxes next to tree view items.
I was hoping that somehow I could read/get the outlook folder icons from my add in code which is written in C# (any solution that works with outlook object model would do).
I was trying hard around MAPIFolder.GetCustomIcon but it returns null for all folders and when you read the documentation it is clear that it is not meant for this i.e. it returns value only if folder has custom icon and if it is not any of default folders.
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.outlook.mapifolder.getcustomicon%28v=office.14%29.aspx
Thanks for reading.
You'll have to use an icon editing tool (like Axialis Icon Workshop) that can extract icon and image resources from related Outlook .dll and .exe files. It's a real mess to figure out what icon is where there as they exist in small and large quantities in very many different files.

How to get the system icon for any file/folder

How can I retrieve the system icon associated with a file/folder so that
I can show it in the list view adjacent to the file/folder name?
You need to use Icon.ExtractAssociatedIcon
Icon icon = Icon.ExtractAssociatedIcon(filepath);
Take a look at Icon.ExtractAssociatedIcon documentation
Note: this works only for files. For folders you need P/Invoke sample is here Edit: Page is now defunct, please refer to this copy on the Wayback Machine.
See Obtaining (and managing) file and folder icons using SHGetFileInfo in C#.

assign an icon to a file in c#

I have an application that would create a file of some extension, let say .ext, and assign an icon to it. The problem is that, I can create many .ext files and all of them should have different icons.
For eg:
foo.ext --> icon as foo.png
bar.ext --> icon as bar.png
I can register my application to open the specific extension (.ext in this case) and do the required task, but I don't know how to show different icons to different files.
Is it possible to do so? I am using c#, but a native API in c/c++ would also do.
Thanks,
John
You need to create an icon handler shell extension.

Access to system imagelist

I am creating a treeview which wil have folder images for directories and want to know if there is a way to access the system image list so that I can display the system default folder image.
Thx
Mark.
There is no out-of-the-box image list for the system images (they depend on things like the current visual theme). The entry for SHGetFileInfo at pinvoke.net has a code sample for extracting icons for files (and, I presume, folders). You can use that and dynamically populate an ImageList component to get the tree view display the appropriate icons.
To get the current system icons you should take a look into the registry at HKEY_CLASSES_ROOT\Folder\DefaultIcon. Here you'll find the path and position of the used folder icon.

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