Organize My Data: Libraries in Windows 7 in VB.NET

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BHID_SFObject, IID_PPV_ARGS(&psf)); if(SUCCEEDED(hr)) { IEnumIDList *penumIDList; psf->EnumObjects( NULL,
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Organize My Data: Libraries in Windows 7
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SHCONTF_FOLDERS | SHCONTF_NONFOLDERS, IID_PPV_ARGS(&penumIDList)); //use penumIDList to enumerate the content of the folder } }
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Here you can see that by using the helper function SHGetKnownFolderItem we can retrieve the library s correct location by passing the FOLDERID_PicturesLibrary, which is a GUID representing the known folder in our case, the Picture library. SHGetKnownFolderItem is a Shell Helper function and is part of a larger group of helper functions that can be found in the Shlobj.h header file in the Windows 7 SDK. You want to pay attention to the third parameter of SHGetKnownFolderItem, an access token that is used to represent a specific user. In our sample, it is set to null, indicating the current user. However, you can also pass a different access token to impersonate a different user, but you need to make sure you have the correct security privileges. You need to remember that a known folder can be any public folder that the current user might not have access to. A successful call fills the IShellItem *psi interface with the correct information about the library represented as a shell item. From this point, the rest of the code is standard shell programming, where we use BindToHandler to bind the previously obtained shell item to a shell folder. Next, we enumerate through the different items in the shell folder, which in the case of a library can be either files or folders. Note the SHCONTF_FOLDERS and SHCONTF_NONFOLDERS flags that we are passing. They are telling the shell folder that we want to return all the files and folders in a library. We could pass SHCONTF_NAVIGATION_ENUM to just get the library folders instead of the entire library contents. The Library Management Window dialog displays the list of folders in the library by passing SHCONTF_NAVIGATION_ENUM just to get the folders.
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So far we ve covered how libraries work in Windows 7, what effect they might have on applications, and how they fit into the existing shell programming model. But with new functionality comes a new set of APIs to use. Let s start by reviewing the equivalent code for consuming the contents of a library using the new Windows 7 Libraries API. The following code doesn t contain the required error-handling code that must be used in production code:
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94 Introduction to Windows 7 for Developers
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IShellLibrary *pslLibrary; HRESULT hr = SHLoadLibraryFromKnownFolder( FOLDERID_PicturesLibrary, STGM_READ, IID_PPV_ARGS(&pslLibrary)); if(SUCCEEDED(hr)) { IShellItemArray *psiaFolders; hr = pslLibrary->GetFolders( LFF_STORAGEITEMS, IID_PPV_ARGS(&psiaFolders)); IEnumShellItems *penumShellItems; psiaFolders->EnumItems(&penumShellItems); //work with penumShellItem to enumerate the library locations.
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penumShellItems->Release(); psiaFolders->Release(); } pslLibrary->Release();
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Here you can see that we use another helper function, SHLoadLibraryFromKnownFolder, to create the IShellLibrary object. From the IShellLibrary object, we can call the GetFolders method to return an IShellItemArray that later is used to obtain an enumerator to traverse through the entire library contents. In the example shown earlier, we used another helper function, SHLoadLibraryFromKnownFolder. This helper function and others related to Windows 7 Libraries can be found in the Shlobj.h header file in the Windows 7 SDK. Here s a list of the important library helper functions: SHAddFolderPathToLibrary Adds a folder to a library. SHCreateLibrary Creates an IShellLibrary object. SHLoadLibraryFromItem Creates and loads an IShellLibrary object from a specified library definition file. SHLoadLibraryFromKnownFolder a specified KNOWNFOLDERID. Creates and loads an IShellLibrary object for
SHLoadLibraryFromParsingName Creates and loads an IShellLibrary object for a specified absolute path that can change based on localization. Therefore, it is best to use the SHLoadLibraryFromKnownFolder, which is agnostic to localization. SHRemoveFolderPathFromLibrary Removes a folder from a library.
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Organize My Data: Libraries in Windows 7
SHResolveFolderPathInLibrary Attempts to resolve the target location of a library folder that has been moved or renamed. If you were working on a shared library and someone else (human or software) changed or removed one of the folders in the library without your knowledge, you can try and locate the folder by calling this function. This function will try to look in the history of the library files and figure out what have happened with the required library file. If the library file was deleted, it could be found in the Recycle Bin and therefore can be retrieved if needed. SHSaveLibraryInFolderPath Saves an IShellLibrary object to disk, which creates an XML library definition file, as mentioned earlier in the chapter, in the desired path. Usually, it makes sense to store library definition files in the default Libraries folder using the SaveInKnownFolder passing the libraries known folder as input parameter, but you can save such a file in any valid location on your disk.
Because all these helper methods are inline functions, you can find their code in the Shobjidl.h header file. By reviewing their code, you can get a better understanding of how the library APIs work and how to use the low-level IShellLibrary methods. For example, let s review the code for creating a new library. The following code snippet is copied from the Shobjidl.h header file:
__inline HRESULT SHCreateLibrary(__in REFIID riid, __deref_out void **ppv)
return CoCreateInstance(CLSID_ShellLibrary,NULL, CLSCTX_INPROC_SERVER, riid, ppv);
Here you can see that under the covers, this helper function simply takes care of calling the COM CoCreateInstance function for us. Let s review another example, adding a new folder to an existing library by using SHAddFolderPathToLibrary:
__inline HRESULT SHAddFolderPathToLibrary( __in IShellLibrary *plib, __in PCWSTR pszFolderPath) { IShellItem *psiFolder; hr = SHCreateItemFromParsingName( pszFolderPath, NULL, IID_PPV_ARGS(&psiFolder));
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