Using the Windows Property System avoids this sort of problem. png file instead, you need a different codec and different code to do so. jpeg and EXIF codecs to read the bytes of the file to discover what the dimensions of the image are. Examples of items that can be abstracted include Microsoft Office documents, ID3 tags, and AutoCAD and other third-party proprietary software. The value expression is flexible, supporting many data types, and is extensible, enabling arbitrary data ( VT_BLOB) and objects to be expressed as a value.ĭue to the abstraction, you can query the attributes or metadata of any item. The abstract data model provided by the Windows Property System is a method for reading and writing an extensible set of named values that are associated with a Shell item. The Windows Property System creates an abstract data model that provides a level of abstraction from individual file formats. png, or use the In-Memory Property Store, which produces and consumes the MS-PROPSTORE binary format. Developers should implement a property handler that produces and consumes their file type's native format, such as. ![]() Each property handler is associated with a particular file type, which is identified by the file name extension. The translated data is exposed programmatically and shown to the user through Windows Explorer in a variety of contexts including details view, infotips, details pane, property pages, and so forth. These systems can then interact with the property handler to write and read properties to and from the file. That is, the property is always defined as a multi-value string, but may have a different value (or no value at all) for each item.Ī property handler translates data stored in a file into a structured schema that is recognized by and can be accessed by Windows Explorer, Windows Search, and other applications. A value is specific to an individual item. The name and schema description are defined globally, and are the same for all items and types. The schema description consists of information about the property, such as the property name, data type, constraints, information on how the property interacts with views and the search system, and so forth. propdesc XML file format and expressed programmatically through IPropertyDescription.
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