Windows apps
Collapse the table of content
Expand the table of content
Information
Switch
Switch
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

MemoryMappedFile::CreateFromFile Method (String^, FileMode)

.NET Framework (current version)
 

Creates a memory-mapped file that has the specified access mode from a file on disk.

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

C#
C++
F#
VB
Copy 
public:
static MemoryMappedFile^ CreateFromFile(
	String^ path,
	FileMode mode
)

Parameters

path
Type: System::String^

The path to file to map.

mode
Type: System.IO::FileMode

Access mode; must be Open.

Return Value

Type: System.IO.MemoryMappedFiles::MemoryMappedFile^

A memory-mapped file that has the specified access mode.

Exception Condition
ArgumentException

path is an empty string, contains only white space, or has one or more invalid characters, as defined by the Path::GetInvalidFileNameChars method.

-or-

path refers to an invalid device.

-or-

mode is Append.

ArgumentNullException

path is null.

IOException

mode is Create, CreateNew, or Truncate.

-or-

mode is OpenOrCreate and the file on disk does not exist.

-or-

An I/O error occurred.

PathTooLongException

path exceeds the maximum length defined by the operating system. In Windows, paths must contain fewer than 248 characters, and file names must contain fewer than 260 characters.

SecurityException

The caller does not have the required permissions for the file.

The mode parameter pertains to the source file on disk. You can use only the Open enumeration value to create the memory-mapped file from the source file on disk.

.NET Framework
Available since 4.0
Return to top
Show:
© 2017 Microsoft