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MemoryMappedFile::OpenExisting Method (String)

Opens an existing memory-mapped file that has the specified name in system memory.

Namespace:  System.IO.MemoryMappedFiles
Assembly:  System.Core (in System.Core.dll)

public:
static MemoryMappedFile^ OpenExisting(
	String^ mapName
)

Parameters

mapName
Type: System::String

The name of the memory-mapped file to open.

Return Value

Type: System.IO.MemoryMappedFiles::MemoryMappedFile
A memory-mapped file that has the specified name.

ExceptionCondition
ArgumentException

mapName is an empty string.

ArgumentNullException

mapName is nullptr.

FileNotFoundException

The file specified for mapName does not exist.

The memory-mapped file can be either a persisted memory-mapped file (associated with a file on disk) or non persisted.

Opening a Persisted Memory-Mapped File

The following example opens a memory-mapped file named ImgA that has already been created from a file on disk (as shown in the example for the CreateFromFile(String) method).

No code example is currently available or this language may not be supported.

Opening a Non-Persisted Memory-Mapped File

The following example opens a memory-mapped file used for inter-process communication. This code example is part of a larger example provided for the CreateNew(String, Int64) method.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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