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Marshal::ReadInt64 Method (Object, Int32)

Reads a 64-bit signed integer at a given offset from unmanaged memory.

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

public:
static long long ReadInt64(
	[InAttribute] Object^ ptr, 
	int ofs
)

Parameters

ptr
Type: System::Object

The base address in unmanaged memory of the source object.

ofs
Type: System::Int32

An additional byte offset, which is added to the ptr parameter before reading.

Return Value

Type: System::Int64
The 64-bit signed integer read from unmanaged memory at the given offset.

ExceptionCondition
AccessViolationException

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

ArgumentException

ptr is an ArrayWithOffset object. This method does not accept ArrayWithOffset parameters.

ReadInt64 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 reading its element values.

Reading from unaligned memory locations is supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Obsolete (compiler warning) in Windows Phone 8.1

  • SecurityCriticalAttribute 

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

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