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UnmanagedMemoryStream.Initialize Method (Byte*, Int64, Int64, FileAccess)

Initializes a new instance of the UnmanagedMemoryStream class by using a pointer to an unmanaged memory location.

This API is not CLS-compliant. 

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

protected void Initialize(
	byte* pointer,
	long length,
	long capacity,
	FileAccess access


Type: System.Byte*
A pointer to an unmanaged memory location.
Type: System.Int64
The length of the memory to use.
Type: System.Int64
The total amount of memory assigned to the stream.
Type: System.IO.FileAccess
One of the FileAccess values.


The user does not have the required permission.


The pointer value is null.


The length value is less than zero.

- or -

The capacity value is less than zero.

- or -

The length value is large enough to cause an overflow.

This method is equivalent to the UnmanagedMemoryStream constructor. It supports methods that need to initialize the pointer before setting stream variables and, therefore, cannot call the parameterized constructor. Such methods should use the default constructor, UnmanagedMemoryStream(), initialize the pointer, and then invoke the Initialize method.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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