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Marshal.WriteInt16 Method (IntPtr, Int32, Int16)

.NET Framework 4

Writes a 16-bit signed integer value into unmanaged memory at a specified offset.

Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)

public static void WriteInt16(
	IntPtr ptr,
	int ofs,
	short val
)

Parameters

ptr: Type: System.IntPtr
The base address in unmanaged memory to write to.

ofs: Type: System.Int32
An additional byte offset, which is added to the ptr parameter before writing.

val: Type: System.Int16
The value to write.

Exceptions

Exception	Condition
AccessViolationException	Base address (ptr) plus offset byte (ofs) produces a null or invalid address.

Remarks

WriteInt16 enables direct interaction with an unmanaged 16-bit signed array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before setting its element values.

Writing to unaligned memory locations is supported.

Examples

The following example demonstrates how to read and write to an unmanaged array using the ReadInt16 and WriteInt16 methods.


static void ReadWriteInt16()
{
    // Allocate unmanaged memory. 
    int elementSize = 2;
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

    // Set the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Marshal.WriteInt16(unmanagedArray, i * elementSize, ((Int16)(i + 1)));
    }
    Console.WriteLine("Unmanaged memory written.");

    Console.WriteLine("Reading unmanaged memory:");
    // Print the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Console.WriteLine(Marshal.ReadInt16(unmanagedArray, i * elementSize));
    }

    Marshal.FreeHGlobal(unmanagedArray);

    Console.WriteLine("Done. Press Enter to continue.");
    Console.ReadLine();
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET Framework Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Platforms

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.

Reference

Marshal Class

WriteInt16 Overload

System.Runtime.InteropServices Namespace

Copy

WriteByte

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