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if (SUCCEEDED(hr)) { hr = plib->AddFolder(psiFolder); psiFolder->Release(); } return hr; }
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Here you can see that even a helper function is using another helper function to perform its operations. However, the importance of the helper functions lies in how you use them. Let s examine the following code snippet, which creates a new library and adds a folder to it:
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IShellLibrary *pIShellLibrary; HRESULT hr = SHCreateLibrary(IID_PPV_ARGS(&pIShellLibrary)); if (SUCCEEDED(hr)) { IShellItem *pIShellItem; SHAddFolderPathToLibrary( pIShellLibrary, L"C:\\Users\\Public\\Documents"); hr = pIShellLibrary->SaveInKnownFolder( FOLDERID_Libraries, L"My New Library", LSF_MAKEUNIQUENAME, &pIShellItem); pIShellItem->Release(); pIShellLibrary->Release(); }
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Here you can see that we create a new IShellLibrary object using the SHCreateLibrary method. Next, we add the public Documents folder to the library object, save the new library in the Libraries folder with the rest of the libraries, and name the new library My New Library. Behind the scenes, this code creates a new My New Library.library-ms library definition file, which includes a single folder. In the previous sample, we used the SaveInKnownFolder method of the IShellLibrary interface to save the new library we created. The IShellLibrary interface exposed most of the shell library operations. Most of the methods in the IShellLibrary interface are self-explanatory; however, let s review some that require our attention: The Commit method commits library changes to an existing library file. This means that whenever you programmatically change a library, you need to call the commit method to save the changes. The SetIcon method sets the library icon and takes a string as a parameter that concatenates a resource dynamic-link library (DLL) name and Icon index, separated by a comma.
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The SetOption method currently has only one option: to pin the library to the libraries shown in the Windows Explorer navigation pane (the left panel). You need to set the LOF_PINNEDTONAVPANE flag in the LIBRARYOPTIONFLAGS structure that is passed as a parameter to the SetOption method. The SetFolderType method receives a GUID of known folder type templates as an input parameter. This GUID defines the type of library, which can be Generic, Pictures, Music, Videos, Documents, or any other type defined by FOLDERTYPEID. Setting the folder type template changes the Windows Explorer view of the library and enables the search options and pivotal view that are specific to the library s type.
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So far, we ve seen how to create a new library using the native IShellLibrary API; it is time to review a similar example using the managed code API. The following code snippet is based on the Windows API Code Pack. To work with the Code Pack, you need to include a reference in your application to Microsoft.WindowsAPICodePack.Shell. The following code snippet creates a new library, adds a few folders, and sets a new default save location. Next, we enumerate through the library s folders.
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string folder1 = @"c:\temp\pic demo folder1"; string folder2 = @"c:\temp\pic demo folder2"; string folder3 = @"c:\temp\pic demo new default save location"; ShellLibrary lib = new ShellLibrary("My Pictures Demo Lib", true); lib.Add(folder1); lib.Add(folder2); lib.Add(folder3); lib.LibraryType = LibraryFolderType.Pictures; lib.DefaultSaveFolder = folder3; IEnumerator<FileSystemFolder> enumerator = lib.GetEnumerator(); while (enumerator.MoveNext() ) { // traverse through the library contents FileSystemFolder folder = enumerator.Current; Debug.WriteLine(folder.Name); }
Here we re creating a new library by creating a new ShellLibrary object. The second parameter is a Boolean indicating whether to override an existing library, which is useful for debugging. After adding a few existing folders using the ShellLibrary.Add( string ) method, we change the library s folder type to FolderType.Pictures, which affects the arrangement options and when viewing My Pictures Demo Lib in Windows Explorer promoting the picture properties. Note that if you try to add a folder that doesn t exist, a DirectoryNotFoundException is thrown. Next, we change the default save location again, make sure you set the default location to a valid folder. For customized libraries, such as our My Pictures Demo Lib, the default save location is
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