Marshal::WriteInt64 Method (IntPtr, Int32, Int64)

.NET Framework (current version)

Writes a 64-bit signed integer value to unmanaged memory at a specified offset.

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

Syntax

public:
[SecurityCriticalAttribute]
static void WriteInt64(
	IntPtr ptr,
	int ofs,
	long long val
)

Parameters

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

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

val: Type: System::Int64
The value to write.

Exceptions

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

WriteInt64 enables direct interaction with an unmanaged 64-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 ReadInt64 and WriteInt64 methods.

C++

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

Security

SecurityCriticalAttribute

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

Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1