ProtectedFileStream class
Used to access a protected file.
Syntax
public ref class ProtectedFileStream sealed : IRandomAccessStream
Members
The ProtectedFileStream class inherits from IRandomAccessStream. ProtectedFileStream also has these types of members:
Methods
The ProtectedFileStream class has these methods. It also inherits methods from the Object class.
| Method | Description |
|---|---|
| AcquireAsync | Creates a ProtectedFileStream object from a backing stream. |
| CloneStream | Creates a new instance of ProtectedFileStream over the protected file. |
| CreateAsync | Creates a ProtectedFileStream from a UserPolicy object and a backing stream. |
| FlushAsync | Flushes the data asynchronously to the protected file. |
| GetInputStreamAt | Returns an input stream at the specified position in the protected file. |
| GetOutputStreamAt | Returns an output stream at the specified location in the protected file. |
| ReadAsync | Returns an asynchronous byte reader object. |
| Seek | Sets the current position to the specified number of bytes from the start of the file. |
| WriteAsync | Writes data asynchronously to the protected file. |
Properties
The ProtectedFileStream class has these properties.
| Property | Access type | Description |
|---|---|---|
| CanRead |
Read-only |
Gets a value that indicates whether the file can be read from. Implements the IRandomAccessStream.CanRead property. |
| CanWrite |
Read-only |
Gets a value that indicates whether the file can be written to. Implements the IRandomAccessStream.CanWrite property. |
| OriginalFileExtension |
Read-only |
Gets the filename extension of the original (unprotected) file. |
| Policy |
Read-only |
Gets user policy associated with this ProtectedFileStream object. |
| Position |
Read-only |
Gets the current file position in bytes. |
| Size |
Read/write |
Gets or sets the size of the protected data in bytes. |
Remarks
ProtectedFileStream objects are used to open and create protected files and to read and write protected content from and to protected files. The ProtectedFileStream class implements the Windows.Storage.Streams.IRandomAccessStream interface so that apps can read and write from and to protected files as they would by using standard Windows Runtime streams. When you create a ProtectedFileStream, you specify a backing stream, an object of IRandomAccessStream, where the actual protected file is or should be stored.
Thread Safety
Members of this class are not guaranteed to be thread safe.
Requirements
| Minimum supported client |
None supported |
| Minimum supported server |
None supported |
| Minimum supported phone |
Windows Phone 8.1 |
| Namespace |
Microsoft::RightsManagement |
| Metadata |
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