126 lines
4.4 KiB
C#
126 lines
4.4 KiB
C#
using System;
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namespace ShellExtensions.Interop.Common
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{
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/// <summary>
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/// The STGM constants are flags that indicate
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/// conditions for creating and deleting the object and access modes
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/// for the object.
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///
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/// You can combine these flags, but you can only choose one flag
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/// from each group of related flags. Typically one flag from each
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/// of the access and sharing groups must be specified for all
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/// functions and methods which use these constants.
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/// </summary>
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[Flags]
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public enum AccessModes
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{
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/// <summary>
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/// Indicates that, in direct mode, each change to a storage
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/// or stream element is written as it occurs.
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/// </summary>
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Direct = 0x00000000,
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/// <summary>
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/// Indicates that, in transacted mode, changes are buffered
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/// and written only if an explicit commit operation is called.
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/// </summary>
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Transacted = 0x00010000,
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/// <summary>
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/// Provides a faster implementation of a compound file
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/// in a limited, but frequently used, case.
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/// </summary>
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Simple = 0x08000000,
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/// <summary>
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/// Indicates that the object is read-only,
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/// meaning that modifications cannot be made.
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/// </summary>
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Read = 0x00000000,
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/// <summary>
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/// Enables you to save changes to the object,
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/// but does not permit access to its data.
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/// </summary>
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Write = 0x00000001,
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/// <summary>
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/// Enables access and modification of object data.
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/// </summary>
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ReadWrite = 0x00000002,
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/// <summary>
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/// Specifies that subsequent openings of the object are
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/// not denied read or write access.
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/// </summary>
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ShareDenyNone = 0x00000040,
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/// <summary>
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/// Prevents others from subsequently opening the object in Read mode.
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/// </summary>
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ShareDenyRead = 0x00000030,
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/// <summary>
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/// Prevents others from subsequently opening the object
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/// for Write or ReadWrite access.
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/// </summary>
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ShareDenyWrite = 0x00000020,
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/// <summary>
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/// Prevents others from subsequently opening the object in any mode.
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/// </summary>
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ShareExclusive = 0x00000010,
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/// <summary>
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/// Opens the storage object with exclusive access to the most
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/// recently committed version.
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/// </summary>
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Priority = 0x00040000,
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/// <summary>
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/// Indicates that the underlying file is to be automatically destroyed when the root
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/// storage object is released. This feature is most useful for creating temporary files.
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/// </summary>
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DeleteOnRelease = 0x04000000,
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/// <summary>
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/// Indicates that, in transacted mode, a temporary scratch file is usually used
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/// to save modifications until the Commit method is called.
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/// Specifying NoScratch permits the unused portion of the original file
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/// to be used as work space instead of creating a new file for that purpose.
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/// </summary>
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NoScratch = 0x00100000,
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/// <summary>
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/// Indicates that an existing storage object
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/// or stream should be removed before the new object replaces it.
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/// </summary>
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Create = 0x00001000,
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/// <summary>
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/// Creates the new object while preserving existing data in a stream named "Contents".
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/// </summary>
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Convert = 0x00020000,
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/// <summary>
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/// Causes the create operation to fail if an existing object with the specified name exists.
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/// </summary>
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FailIfThere = 0x00000000,
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/// <summary>
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/// This flag is used when opening a storage object with Transacted
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/// and without ShareExclusive or ShareDenyWrite.
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/// In this case, specifying NoSnapshot prevents the system-provided
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/// implementation from creating a snapshot copy of the file.
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/// Instead, changes to the file are written to the end of the file.
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/// </summary>
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NoSnapshot = 0x00200000,
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/// <summary>
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/// Supports direct mode for single-writer, multireader file operations.
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/// </summary>
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DirectSingleWriterMultipleReader = 0x00400000
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}
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}
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